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-rw-r--r--src/grt/fst/fstapi.c158
-rw-r--r--src/grt/fst/fstapi.h10
-rw-r--r--src/grt/fst/lz4.c1183
-rw-r--r--src/grt/fst/lz4.h279
4 files changed, 993 insertions, 637 deletions
diff --git a/src/grt/fst/fstapi.c b/src/grt/fst/fstapi.c
index b0d7dfc40..18d38ec99 100644
--- a/src/grt/fst/fstapi.c
+++ b/src/grt/fst/fstapi.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2009-2014 Tony Bybell.
+ * Copyright (c) 2009-2015 Tony Bybell.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -279,7 +279,6 @@ return(ftruncate(fd, length));
static char *fstRealpath(const char *path, char *resolved_path)
{
#if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __CYGWIN__ || defined HAVE_REALPATH
-
#if (defined(__MACH__) && defined(__APPLE__))
if(!resolved_path)
{
@@ -297,6 +296,8 @@ if(!resolved_path)
}
return(_fullpath(resolved_path, path, PATH_MAX));
#else
+(void)path;
+(void)resolved_path;
return(NULL);
#endif
#endif
@@ -1449,12 +1450,12 @@ for(i=0;i<xc->maxhandle;i++)
PPvoid_t pv = JudyHSIns(&PJHSArray, dmem, destlen, NULL);
if(*pv)
{
- uint32_t pvi = (long)(*pv);
+ uint32_t pvi = (intptr_t)(*pv);
vm4ip[2] = -pvi;
}
else
{
- *pv = (void *)(long)(i+1);
+ *pv = (void *)(intptr_t)(i+1);
#endif
fpos += fstWriterVarint(f, wrlen);
fpos += destlen;
@@ -1469,12 +1470,12 @@ for(i=0;i<xc->maxhandle;i++)
PPvoid_t pv = JudyHSIns(&PJHSArray, scratchpnt, wrlen, NULL);
if(*pv)
{
- uint32_t pvi = (long)(*pv);
+ uint32_t pvi = (intptr_t)(*pv);
vm4ip[2] = -pvi;
}
else
{
- *pv = (void *)(long)(i+1);
+ *pv = (void *)(intptr_t)(i+1);
#endif
fpos += fstWriterVarint(f, 0);
fpos += wrlen;
@@ -1504,12 +1505,12 @@ for(i=0;i<xc->maxhandle;i++)
PPvoid_t pv = JudyHSIns(&PJHSArray, dmem, rc, NULL);
if(*pv)
{
- uint32_t pvi = (long)(*pv);
+ uint32_t pvi = (intptr_t)(*pv);
vm4ip[2] = -pvi;
}
else
{
- *pv = (void *)(long)(i+1);
+ *pv = (void *)(intptr_t)(i+1);
#endif
fpos += fstWriterVarint(f, wrlen);
fpos += rc;
@@ -1524,12 +1525,12 @@ for(i=0;i<xc->maxhandle;i++)
PPvoid_t pv = JudyHSIns(&PJHSArray, scratchpnt, wrlen, NULL);
if(*pv)
{
- uint32_t pvi = (long)(*pv);
+ uint32_t pvi = (intptr_t)(*pv);
vm4ip[2] = -pvi;
}
else
{
- *pv = (void *)(long)(i+1);
+ *pv = (void *)(intptr_t)(i+1);
#endif
fpos += fstWriterVarint(f, 0);
fpos += wrlen;
@@ -1546,12 +1547,12 @@ for(i=0;i<xc->maxhandle;i++)
PPvoid_t pv = JudyHSIns(&PJHSArray, scratchpnt, wrlen, NULL);
if(*pv)
{
- uint32_t pvi = (long)(*pv);
+ uint32_t pvi = (intptr_t)(*pv);
vm4ip[2] = -pvi;
}
else
{
- *pv = (void *)(long)(i+1);
+ *pv = (void *)(intptr_t)(i+1);
#endif
fpos += fstWriterVarint(f, 0);
fpos += wrlen;
@@ -2299,22 +2300,24 @@ if(xc && path && path[0])
#ifndef _WAVE_HAVE_JUDY
const uint32_t hashmask = FST_PATH_HASHMASK;
const unsigned char *path2 = (const unsigned char *)path;
+ PPvoid_t pv;
#else
char *path2 = alloca(slen + 1); /* judy lacks const qualifier in its JudyHSIns definition */
+ PPvoid_t pv;
strcpy(path2, path);
#endif
- PPvoid_t pv = JudyHSIns(&(xc->path_array), path2, slen, NULL);
+ pv = JudyHSIns(&(xc->path_array), path2, slen, NULL);
if(*pv)
{
- sidx = (long)(*pv);
+ sidx = (intptr_t)(*pv);
}
else
{
char *rp = NULL;
sidx = ++xc->path_array_count;
- *pv = (void *)(long)(xc->path_array_count);
+ *pv = (void *)(intptr_t)(xc->path_array_count);
if(use_realpath)
{
@@ -2360,6 +2363,12 @@ fstWriterSetAttrGeneric(ctx, comm, FST_MT_COMMENT, 0);
}
+void fstWriterSetValueList(void *ctx, const char *vl)
+{
+fstWriterSetAttrGeneric(ctx, vl, FST_MT_VALUELIST, 0);
+}
+
+
void fstWriterSetEnvVar(void *ctx, const char *envvar)
{
fstWriterSetAttrGeneric(ctx, envvar, FST_MT_ENVVAR, 0);
@@ -3065,6 +3074,7 @@ uint32_t *rvat_chain_table_lengths;
uint64_t rvat_vc_maxhandle;
off_t rvat_vc_start;
uint32_t *rvat_sig_offs;
+int rvat_packtype;
uint32_t rvat_chain_len;
unsigned char *rvat_chain_mem;
@@ -5877,6 +5887,7 @@ if(frame_uclen == frame_clen)
xc->rvat_vc_maxhandle = fstReaderVarint64(xc->f);
xc->rvat_vc_start = ftello(xc->f); /* points to '!' character */
+xc->rvat_packtype = fgetc(xc->f);
#ifdef FST_DEBUG
fprintf(stderr, "\tframe_uclen: %d, frame_clen: %d, frame_maxhandle: %d\n",
@@ -5901,37 +5912,84 @@ xc->rvat_chain_table_lengths = calloc((xc->rvat_vc_maxhandle+1), sizeof(uint32_t
pnt = chain_cmem;
idx = 0;
pval = 0;
-do
- {
- int skiplen;
- uint64_t val = fstGetVarint32(pnt, &skiplen);
- if(!val)
- {
- pnt += skiplen;
- val = fstGetVarint32(pnt, &skiplen);
- xc->rvat_chain_table[idx] = 0;
- xc->rvat_chain_table_lengths[idx] = -val;
- idx++;
- }
- else
- if(val&1)
- {
- pval = xc->rvat_chain_table[idx] = pval + (val >> 1);
- if(idx) { xc->rvat_chain_table_lengths[pidx] = pval - xc->rvat_chain_table[pidx]; }
- pidx = idx++;
- }
- else
- {
- fstHandle loopcnt = val >> 1;
- for(i=0;i<loopcnt;i++)
+if(sectype == FST_BL_VCDATA_DYN_ALIAS2)
+ {
+ uint32_t prev_alias = 0;
+
+ do {
+ int skiplen;
+
+ if(*pnt & 0x01)
+ {
+ int64_t shval = fstGetSVarint64(pnt, &skiplen) >> 1;
+ if(shval > 0)
+ {
+ pval = xc->rvat_chain_table[idx] = pval + shval;
+ if(idx) { xc->rvat_chain_table_lengths[pidx] = pval - xc->rvat_chain_table[pidx]; }
+ pidx = idx++;
+ }
+ else if(shval < 0)
+ {
+ xc->rvat_chain_table[idx] = 0; /* need to explicitly zero as calloc above might not run */
+ xc->rvat_chain_table_lengths[idx] = prev_alias = shval; /* because during this loop iter would give stale data! */
+ idx++;
+ }
+ else
+ {
+ xc->rvat_chain_table[idx] = 0; /* need to explicitly zero as calloc above might not run */
+ xc->rvat_chain_table_lengths[idx] = prev_alias; /* because during this loop iter would give stale data! */
+ idx++;
+ }
+ }
+ else
{
- xc->rvat_chain_table[idx++] = 0;
+ uint64_t val = fstGetVarint32(pnt, &skiplen);
+
+ fstHandle loopcnt = val >> 1;
+ for(i=0;i<loopcnt;i++)
+ {
+ xc->rvat_chain_table[idx++] = 0;
+ }
}
- }
-
- pnt += skiplen;
- } while (pnt != (chain_cmem + chain_clen));
+
+ pnt += skiplen;
+ } while (pnt != (chain_cmem + chain_clen));
+ }
+ else
+ {
+ do
+ {
+ int skiplen;
+ uint64_t val = fstGetVarint32(pnt, &skiplen);
+
+ if(!val)
+ {
+ pnt += skiplen;
+ val = fstGetVarint32(pnt, &skiplen);
+ xc->rvat_chain_table[idx] = 0;
+ xc->rvat_chain_table_lengths[idx] = -val;
+ idx++;
+ }
+ else
+ if(val&1)
+ {
+ pval = xc->rvat_chain_table[idx] = pval + (val >> 1);
+ if(idx) { xc->rvat_chain_table_lengths[pidx] = pval - xc->rvat_chain_table[pidx]; }
+ pidx = idx++;
+ }
+ else
+ {
+ fstHandle loopcnt = val >> 1;
+ for(i=0;i<loopcnt;i++)
+ {
+ xc->rvat_chain_table[idx++] = 0;
+ }
+ }
+
+ pnt += skiplen;
+ } while (pnt != (chain_cmem + chain_clen));
+ }
free(chain_cmem);
xc->rvat_chain_table[idx] = indx_pos - xc->rvat_vc_start;
@@ -5995,10 +6053,20 @@ if(!xc->rvat_chain_mem)
unsigned char *mc = malloc(xc->rvat_chain_table_lengths[facidx]);
unsigned long destlen = xc->rvat_chain_len;
unsigned long sourcelen = xc->rvat_chain_table_lengths[facidx];
- int rc;
+ int rc = Z_OK;
fstFread(mc, xc->rvat_chain_table_lengths[facidx], 1, xc->f);
- rc = uncompress(mu, &destlen, mc, sourcelen);
+
+ switch(xc->rvat_packtype)
+ {
+ case '4': rc = (destlen == (unsigned long)LZ4_decompress_safe_partial((char *)mc, (char *)mu, sourcelen, destlen, destlen)) ? Z_OK : Z_DATA_ERROR;
+ break;
+ case 'F': fastlz_decompress(mc, sourcelen, mu, destlen); /* rc appears unreliable */
+ break;
+ default: rc = uncompress(mu, &destlen, mc, sourcelen);
+ break;
+ }
+
free(mc);
if(rc != Z_OK)
diff --git a/src/grt/fst/fstapi.h b/src/grt/fst/fstapi.h
index 83daac4b0..df86ef079 100644
--- a/src/grt/fst/fstapi.h
+++ b/src/grt/fst/fstapi.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2009-2014 Tony Bybell.
+ * Copyright (c) 2009-2015 Tony Bybell.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -191,9 +191,10 @@ enum fstMiscType {
FST_MT_PATHNAME = 3, /* reserved for fstWriterSetSourceStem() string -> number management */
FST_MT_SOURCESTEM = 4, /* use fstWriterSetSourceStem() to emit */
FST_MT_SOURCEISTEM = 5, /* use fstWriterSetSourceInstantiationStem() to emit */
- FST_MT_UNKNOWN = 6,
+ FST_MT_VALUELIST = 6, /* use fstWriterSetValueList() to emit, followed by fstWriterCreateVar*() */
+ FST_MT_UNKNOWN = 7,
- FST_MT_MAX = 6
+ FST_MT_MAX = 7
};
enum fstArrayType {
@@ -246,7 +247,7 @@ enum fstSupplementalVarType {
FST_SVT_VHDL_FILE = 4,
FST_SVT_VHDL_MEMORY = 5,
- FST_SVT_MAX = 5,
+ FST_SVT_MAX = 5
};
enum fstSupplementalDataType {
@@ -358,6 +359,7 @@ void fstWriterSetTimescale(void *ctx, int ts);
void fstWriterSetTimescaleFromString(void *ctx, const char *s);
void fstWriterSetTimezero(void *ctx, int64_t tim);
void fstWriterSetUpscope(void *ctx);
+void fstWriterSetValueList(void *ctx, const char *vl);
void fstWriterSetVersion(void *ctx, const char *vers);
diff --git a/src/grt/fst/lz4.c b/src/grt/fst/lz4.c
index 398e785c1..08cf6b5cd 100644
--- a/src/grt/fst/lz4.c
+++ b/src/grt/fst/lz4.c
@@ -1,6 +1,7 @@
/*
LZ4 - Fast LZ compression algorithm
- Copyright (C) 2011-2014, Yann Collet.
+ Copyright (C) 2011-2015, Yann Collet.
+
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
Redistribution and use in source and binary forms, with or without
@@ -31,117 +32,64 @@
- LZ4 public forum : https://groups.google.com/forum/#!forum/lz4c
*/
+
/**************************************
- Tuning parameters
+* Tuning parameters
**************************************/
/*
* HEAPMODE :
* Select how default compression functions will allocate memory for their hash table,
- * in memory stack (0:default, fastest), or in memory heap (1:requires memory allocation (malloc)).
+ * in memory stack (0:default, fastest), or in memory heap (1:requires malloc()).
*/
#define HEAPMODE 0
-
-/**************************************
- CPU Feature Detection
-**************************************/
-/* 32 or 64 bits ? */
-#if (defined(__x86_64__) || defined(_M_X64) || defined(_WIN64) \
- || defined(__64BIT__) || defined(__mips64) \
- || defined(__powerpc64__) || defined(__powerpc64le__) \
- || defined(__ppc64__) || defined(__ppc64le__) \
- || defined(__PPC64__) || defined(__PPC64LE__) \
- || defined(__ia64) || defined(__itanium__) || defined(_M_IA64) \
- || defined(__s390x__) ) /* Detects 64 bits mode */
-# define LZ4_ARCH64 1
-#else
-# define LZ4_ARCH64 0
-#endif
-#define LZ4_32BITS (sizeof(void*)==4)
-#define LZ4_64BITS (sizeof(void*)==8)
-
/*
- * Little Endian or Big Endian ?
- * Overwrite the #define below if you know your architecture endianess
+ * ACCELERATION_DEFAULT :
+ * Select "acceleration" for LZ4_compress_fast() when parameter value <= 0
*/
-#include <stdlib.h> /* Apparently required to detect endianess */
-#if defined (__GLIBC__)
-# include <endian.h>
-# if (__BYTE_ORDER == __BIG_ENDIAN)
-# define LZ4_BIG_ENDIAN 1
-# endif
-#elif (defined(__BIG_ENDIAN__) || defined(__BIG_ENDIAN) || defined(_BIG_ENDIAN)) && !(defined(__LITTLE_ENDIAN__) || defined(__LITTLE_ENDIAN) || defined(_LITTLE_ENDIAN))
-# define LZ4_BIG_ENDIAN 1
-#elif defined(__sparc) || defined(__sparc__) \
- || defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) \
- || defined(__hpux) || defined(__hppa) \
- || defined(_MIPSEB) || defined(__s390__)
-# define LZ4_BIG_ENDIAN 1
-#else
-/* Little Endian assumed. PDP Endian and other very rare endian format are unsupported. */
-#endif
+#define ACCELERATION_DEFAULT 1
+
+/**************************************
+* CPU Feature Detection
+**************************************/
/*
- * Unaligned memory access is automatically enabled for "common" CPU, such as x86.
- * For others CPU, such as ARM, the compiler may be more cautious, inserting unnecessary extra code to ensure aligned access property
- * If you know your target CPU supports unaligned memory access, you want to force this option manually to improve performance
+ * LZ4_FORCE_SW_BITCOUNT
+ * Define this parameter if your target system or compiler does not support hardware bit count
*/
-#if defined(__ARM_FEATURE_UNALIGNED)
-# define LZ4_FORCE_UNALIGNED_ACCESS 1
-#endif
-
-/* Define this parameter if your target system or compiler does not support hardware bit count */
#if defined(_MSC_VER) && defined(_WIN32_WCE) /* Visual Studio for Windows CE does not support Hardware bit count */
# define LZ4_FORCE_SW_BITCOUNT
#endif
-/*
- * BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE :
- * This option may provide a small boost to performance for some big endian cpu, although probably modest.
- * You may set this option to 1 if data will remain within closed environment.
- * This option is useless on Little_Endian CPU (such as x86)
- */
-/* #define BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE 1 */
+/**************************************
+* Includes
+**************************************/
+#include "lz4.h"
/**************************************
- Compiler Options
+* Compiler Options
**************************************/
-#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */
-/* "restrict" is a known keyword */
-#else
-# define restrict /* Disable restrict */
-#endif
-
#ifdef _MSC_VER /* Visual Studio */
# define FORCE_INLINE static __forceinline
-# include <intrin.h> /* For Visual 2005 */
-# if LZ4_ARCH64 /* 64-bits */
-# pragma intrinsic(_BitScanForward64) /* For Visual 2005 */
-# pragma intrinsic(_BitScanReverse64) /* For Visual 2005 */
-# else /* 32-bits */
-# pragma intrinsic(_BitScanForward) /* For Visual 2005 */
-# pragma intrinsic(_BitScanReverse) /* For Visual 2005 */
-# endif
+# include <intrin.h>
# pragma warning(disable : 4127) /* disable: C4127: conditional expression is constant */
+# pragma warning(disable : 4293) /* disable: C4293: too large shift (32-bits) */
#else
-# ifdef __GNUC__
-# define FORCE_INLINE static inline __attribute__((always_inline))
+# if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */
+# if defined(__GNUC__) || defined(__clang__)
+# define FORCE_INLINE static inline __attribute__((always_inline))
+# else
+# define FORCE_INLINE static inline
+# endif
# else
-# define FORCE_INLINE static inline
-# endif
-#endif
-
-#ifdef _MSC_VER /* Visual Studio */
-# define lz4_bswap16(x) _byteswap_ushort(x)
-#else
-# define lz4_bswap16(x) ((unsigned short int) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8)))
-#endif
-
-#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+# define FORCE_INLINE static
+# endif /* __STDC_VERSION__ */
+#endif /* _MSC_VER */
-#if (GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__)
+/* LZ4_GCC_VERSION is defined into lz4.h */
+#if (LZ4_GCC_VERSION >= 302) || (__INTEL_COMPILER >= 800) || defined(__clang__)
# define expect(expr,value) (__builtin_expect ((expr),(value)) )
#else
# define expect(expr,value) (expr)
@@ -152,7 +100,7 @@
/**************************************
- Memory routines
+* Memory routines
**************************************/
#include <stdlib.h> /* malloc, calloc, free */
#define ALLOCATOR(n,s) calloc(n,s)
@@ -162,13 +110,7 @@
/**************************************
- Includes
-**************************************/
-#include "lz4.h"
-
-
-/**************************************
- Basic Types
+* Basic Types
**************************************/
#if defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */
# include <stdint.h>
@@ -185,46 +127,95 @@
typedef unsigned long long U64;
#endif
-#if defined(__GNUC__) && !defined(LZ4_FORCE_UNALIGNED_ACCESS)
-# define _PACKED __attribute__ ((packed))
-#else
-# define _PACKED
-#endif
-#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
-# if defined(__IBMC__) || defined(__SUNPRO_C) || defined(__SUNPRO_CC)
-# pragma pack(1)
-# else
-# pragma pack(push, 1)
-# endif
-#endif
+/**************************************
+* Reading and writing into memory
+**************************************/
+#define STEPSIZE sizeof(size_t)
-typedef struct { U16 v; } _PACKED U16_S;
-typedef struct { U32 v; } _PACKED U32_S;
-typedef struct { U64 v; } _PACKED U64_S;
-typedef struct {size_t v;} _PACKED size_t_S;
+static unsigned LZ4_64bits(void) { return sizeof(void*)==8; }
-#if !defined(LZ4_FORCE_UNALIGNED_ACCESS) && !defined(__GNUC__)
-# if defined(__SUNPRO_C) || defined(__SUNPRO_CC)
-# pragma pack(0)
-# else
-# pragma pack(pop)
-# endif
-#endif
+static unsigned LZ4_isLittleEndian(void)
+{
+ const union { U32 i; BYTE c[4]; } one = { 1 }; /* don't use static : performance detrimental */
+ return one.c[0];
+}
+
+
+static U16 LZ4_read16(const void* memPtr)
+{
+ U16 val16;
+ memcpy(&val16, memPtr, 2);
+ return val16;
+}
+
+static U16 LZ4_readLE16(const void* memPtr)
+{
+ if (LZ4_isLittleEndian())
+ {
+ return LZ4_read16(memPtr);
+ }
+ else
+ {
+ const BYTE* p = (const BYTE*)memPtr;
+ return (U16)((U16)p[0] + (p[1]<<8));
+ }
+}
+
+static void LZ4_writeLE16(void* memPtr, U16 value)
+{
+ if (LZ4_isLittleEndian())
+ {
+ memcpy(memPtr, &value, 2);
+ }
+ else
+ {
+ BYTE* p = (BYTE*)memPtr;
+ p[0] = (BYTE) value;
+ p[1] = (BYTE)(value>>8);
+ }
+}
+
+static U32 LZ4_read32(const void* memPtr)
+{
+ U32 val32;
+ memcpy(&val32, memPtr, 4);
+ return val32;
+}
+
+static U64 LZ4_read64(const void* memPtr)
+{
+ U64 val64;
+ memcpy(&val64, memPtr, 8);
+ return val64;
+}
-#define A16(x) (((U16_S *)(x))->v)
-#define A32(x) (((U32_S *)(x))->v)
-#define A64(x) (((U64_S *)(x))->v)
-#define AARCH(x) (((size_t_S *)(x))->v)
+static size_t LZ4_read_ARCH(const void* p)
+{
+ if (LZ4_64bits())
+ return (size_t)LZ4_read64(p);
+ else
+ return (size_t)LZ4_read32(p);
+}
+
+
+static void LZ4_copy4(void* dstPtr, const void* srcPtr) { memcpy(dstPtr, srcPtr, 4); }
+
+static void LZ4_copy8(void* dstPtr, const void* srcPtr) { memcpy(dstPtr, srcPtr, 8); }
+
+/* customized version of memcpy, which may overwrite up to 7 bytes beyond dstEnd */
+static void LZ4_wildCopy(void* dstPtr, const void* srcPtr, void* dstEnd)
+{
+ BYTE* d = (BYTE*)dstPtr;
+ const BYTE* s = (const BYTE*)srcPtr;
+ BYTE* e = (BYTE*)dstEnd;
+ do { LZ4_copy8(d,s); d+=8; s+=8; } while (d<e);
+}
/**************************************
- Constants
+* Common Constants
**************************************/
-#define LZ4_HASHLOG (LZ4_MEMORY_USAGE-2)
-#define HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
-#define HASH_SIZE_U32 (1 << LZ4_HASHLOG)
-
#define MINMATCH 4
#define COPYLENGTH 8
@@ -232,13 +223,10 @@ typedef struct {size_t v;} _PACKED size_t_S;
#define MFLIMIT (COPYLENGTH+MINMATCH)
static const int LZ4_minLength = (MFLIMIT+1);
-#define KB *(1U<<10)
-#define MB *(1U<<20)
+#define KB *(1 <<10)
+#define MB *(1 <<20)
#define GB *(1U<<30)
-#define LZ4_64KLIMIT ((64 KB) + (MFLIMIT-1))
-#define SKIPSTRENGTH 6 /* Increasing this value will make the compression run slower on incompressible data */
-
#define MAXD_LOG 16
#define MAX_DISTANCE ((1 << MAXD_LOG) - 1)
@@ -249,130 +237,148 @@ static const int LZ4_minLength = (MFLIMIT+1);
/**************************************
- Structures and local types
+* Common Utils
**************************************/
-typedef struct {
- U32 hashTable[HASH_SIZE_U32];
- U32 currentOffset;
- U32 initCheck;
- const BYTE* dictionary;
- const BYTE* bufferStart;
- U32 dictSize;
-} LZ4_stream_t_internal;
+#define LZ4_STATIC_ASSERT(c) { enum { LZ4_static_assert = 1/(int)(!!(c)) }; } /* use only *after* variable declarations */
-typedef enum { notLimited = 0, limitedOutput = 1 } limitedOutput_directive;
-typedef enum { byPtr, byU32, byU16 } tableType_t;
-typedef enum { noDict = 0, withPrefix64k, usingExtDict } dict_directive;
-typedef enum { noDictIssue = 0, dictSmall } dictIssue_directive;
+/**************************************
+* Common functions
+**************************************/
+static unsigned LZ4_NbCommonBytes (register size_t val)
+{
+ if (LZ4_isLittleEndian())
+ {
+ if (LZ4_64bits())
+ {
+# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r = 0;
+ _BitScanForward64( &r, (U64)val );
+ return (int)(r>>3);
+# elif (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_ctzll((U64)val) >> 3);
+# else
+ static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 };
+ return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58];
+# endif
+ }
+ else /* 32 bits */
+ {
+# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r;
+ _BitScanForward( &r, (U32)val );
+ return (int)(r>>3);
+# elif (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_ctz((U32)val) >> 3);
+# else
+ static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 };
+ return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
+# endif
+ }
+ }
+ else /* Big Endian CPU */
+ {
+ if (LZ4_64bits())
+ {
+# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r = 0;
+ _BitScanReverse64( &r, val );
+ return (unsigned)(r>>3);
+# elif (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_clzll((U64)val) >> 3);
+# else
+ unsigned r;
+ if (!(val>>32)) { r=4; } else { r=0; val>>=32; }
+ if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
+ r += (!val);
+ return r;
+# endif
+ }
+ else /* 32 bits */
+ {
+# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ unsigned long r = 0;
+ _BitScanReverse( &r, (unsigned long)val );
+ return (unsigned)(r>>3);
+# elif (defined(__clang__) || (LZ4_GCC_VERSION >= 304)) && !defined(LZ4_FORCE_SW_BITCOUNT)
+ return (__builtin_clz((U32)val) >> 3);
+# else
+ unsigned r;
+ if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
+ r += (!val);
+ return r;
+# endif
+ }
+ }
+}
-typedef enum { endOnOutputSize = 0, endOnInputSize = 1 } endCondition_directive;
-typedef enum { full = 0, partial = 1 } earlyEnd_directive;
+static unsigned LZ4_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* pInLimit)
+{
+ const BYTE* const pStart = pIn;
+
+ while (likely(pIn<pInLimit-(STEPSIZE-1)))
+ {
+ size_t diff = LZ4_read_ARCH(pMatch) ^ LZ4_read_ARCH(pIn);
+ if (!diff) { pIn+=STEPSIZE; pMatch+=STEPSIZE; continue; }
+ pIn += LZ4_NbCommonBytes(diff);
+ return (unsigned)(pIn - pStart);
+ }
+
+ if (LZ4_64bits()) if ((pIn<(pInLimit-3)) && (LZ4_read32(pMatch) == LZ4_read32(pIn))) { pIn+=4; pMatch+=4; }
+ if ((pIn<(pInLimit-1)) && (LZ4_read16(pMatch) == LZ4_read16(pIn))) { pIn+=2; pMatch+=2; }
+ if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++;
+ return (unsigned)(pIn - pStart);
+}
+#ifndef LZ4_COMMONDEFS_ONLY
/**************************************
- Architecture-specific macros
+* Local Constants
**************************************/
-#define STEPSIZE sizeof(size_t)
-#define LZ4_COPYSTEP(d,s) { AARCH(d) = AARCH(s); d+=STEPSIZE; s+=STEPSIZE; }
-#define LZ4_COPY8(d,s) { LZ4_COPYSTEP(d,s); if (STEPSIZE<8) LZ4_COPYSTEP(d,s); }
-
-#if (defined(LZ4_BIG_ENDIAN) && !defined(BIG_ENDIAN_NATIVE_BUT_INCOMPATIBLE))
-# define LZ4_READ_LITTLEENDIAN_16(d,s,p) { U16 v = A16(p); v = lz4_bswap16(v); d = (s) - v; }
-# define LZ4_WRITE_LITTLEENDIAN_16(p,i) { U16 v = (U16)(i); v = lz4_bswap16(v); A16(p) = v; p+=2; }
-#else /* Little Endian */
-# define LZ4_READ_LITTLEENDIAN_16(d,s,p) { d = (s) - A16(p); }
-# define LZ4_WRITE_LITTLEENDIAN_16(p,v) { A16(p) = v; p+=2; }
-#endif
+#define LZ4_HASHLOG (LZ4_MEMORY_USAGE-2)
+#define HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
+#define HASH_SIZE_U32 (1 << LZ4_HASHLOG) /* required as macro for static allocation */
+
+static const int LZ4_64Klimit = ((64 KB) + (MFLIMIT-1));
+static const U32 LZ4_skipTrigger = 6; /* Increase this value ==> compression run slower on incompressible data */
/**************************************
- Macros
+* Local Structures and types
**************************************/
-#define LZ4_STATIC_ASSERT(c) { enum { LZ4_static_assert = 1/(!!(c)) }; } /* use only *after* variable declarations */
-#if LZ4_ARCH64 || !defined(__GNUC__)
-# define LZ4_WILDCOPY(d,s,e) { do { LZ4_COPY8(d,s) } while (d<e); } /* at the end, d>=e; */
-#else
-# define LZ4_WILDCOPY(d,s,e) { if (likely(e-d <= 8)) LZ4_COPY8(d,s) else do { LZ4_COPY8(d,s) } while (d<e); }
-#endif
+typedef struct {
+ U32 hashTable[HASH_SIZE_U32];
+ U32 currentOffset;
+ U32 initCheck;
+ const BYTE* dictionary;
+ BYTE* bufferStart; /* obsolete, used for slideInputBuffer */
+ U32 dictSize;
+} LZ4_stream_t_internal;
+typedef enum { notLimited = 0, limitedOutput = 1 } limitedOutput_directive;
+typedef enum { byPtr, byU32, byU16 } tableType_t;
-/****************************
- Private local functions
-****************************/
-#if LZ4_ARCH64
+typedef enum { noDict = 0, withPrefix64k, usingExtDict } dict_directive;
+typedef enum { noDictIssue = 0, dictSmall } dictIssue_directive;
-static int LZ4_NbCommonBytes (register U64 val)
-{
-# if defined(LZ4_BIG_ENDIAN)
-# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r = 0;
- _BitScanReverse64( &r, val );
- return (int)(r>>3);
-# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (__builtin_clzll(val) >> 3);
-# else
- int r;
- if (!(val>>32)) { r=4; } else { r=0; val>>=32; }
- if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
- r += (!val);
- return r;
-# endif
-# else
-# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r = 0;
- _BitScanForward64( &r, val );
- return (int)(r>>3);
-# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (__builtin_ctzll(val) >> 3);
-# else
- static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2, 0, 3, 1, 3, 1, 4, 2, 7, 0, 2, 3, 6, 1, 5, 3, 5, 1, 3, 4, 4, 2, 5, 6, 7, 7, 0, 1, 2, 3, 3, 4, 6, 2, 6, 5, 5, 3, 4, 5, 6, 7, 1, 2, 4, 6, 4, 4, 5, 7, 2, 6, 5, 7, 6, 7, 7 };
- return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58];
-# endif
-# endif
-}
+typedef enum { endOnOutputSize = 0, endOnInputSize = 1 } endCondition_directive;
+typedef enum { full = 0, partial = 1 } earlyEnd_directive;
-#else
-static int LZ4_NbCommonBytes (register U32 val)
-{
-# if defined(LZ4_BIG_ENDIAN)
-# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r = 0;
- _BitScanReverse( &r, val );
- return (int)(r>>3);
-# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (__builtin_clz(val) >> 3);
-# else
- int r;
- if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
- r += (!val);
- return r;
-# endif
-# else
-# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
- unsigned long r;
- _BitScanForward( &r, val );
- return (int)(r>>3);
-# elif defined(__GNUC__) && (GCC_VERSION >= 304) && !defined(LZ4_FORCE_SW_BITCOUNT)
- return (__builtin_ctz(val) >> 3);
-# else
- static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 1, 3, 2, 0, 1, 3, 3, 1, 2, 2, 2, 2, 0, 3, 1, 2, 0, 1, 0, 1, 1 };
- return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
-# endif
-# endif
-}
+/**************************************
+* Local Utils
+**************************************/
+int LZ4_versionNumber (void) { return LZ4_VERSION_NUMBER; }
+int LZ4_compressBound(int isize) { return LZ4_COMPRESSBOUND(isize); }
+int LZ4_sizeofState() { return LZ4_STREAMSIZE; }
-#endif
/********************************
- Compression functions
+* Compression functions
********************************/
-int LZ4_versionNumber (void) { return LZ4_VERSION_NUMBER; }
-int LZ4_compressBound(int isize) { return LZ4_COMPRESSBOUND(isize); }
-static int LZ4_hashSequence(U32 sequence, tableType_t tableType)
+static U32 LZ4_hashSequence(U32 sequence, tableType_t const tableType)
{
if (tableType == byU16)
return (((sequence) * 2654435761U) >> ((MINMATCH*8)-(LZ4_HASHLOG+1)));
@@ -380,15 +386,30 @@ static int LZ4_hashSequence(U32 sequence, tableType_t tableType)
return (((sequence) * 2654435761U) >> ((MINMATCH*8)-LZ4_HASHLOG));
}
-static int LZ4_hashPosition(const BYTE* p, tableType_t tableType) { return LZ4_hashSequence(A32(p), tableType); }
+static const U64 prime5bytes = 889523592379ULL;
+static U32 LZ4_hashSequence64(size_t sequence, tableType_t const tableType)
+{
+ const U32 hashLog = (tableType == byU16) ? LZ4_HASHLOG+1 : LZ4_HASHLOG;
+ const U32 hashMask = (1<<hashLog) - 1;
+ return ((sequence * prime5bytes) >> (40 - hashLog)) & hashMask;
+}
-static void LZ4_putPositionOnHash(const BYTE* p, U32 h, void* tableBase, tableType_t tableType, const BYTE* srcBase)
+static U32 LZ4_hashSequenceT(size_t sequence, tableType_t const tableType)
+{
+ if (LZ4_64bits())
+ return LZ4_hashSequence64(sequence, tableType);
+ return LZ4_hashSequence((U32)sequence, tableType);
+}
+
+static U32 LZ4_hashPosition(const void* p, tableType_t tableType) { return LZ4_hashSequenceT(LZ4_read_ARCH(p), tableType); }
+
+static void LZ4_putPositionOnHash(const BYTE* p, U32 h, void* tableBase, tableType_t const tableType, const BYTE* srcBase)
{
switch (tableType)
{
- case byPtr: { const BYTE** hashTable = (const BYTE**) tableBase; hashTable[h] = p; break; }
- case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = (U32)(p-srcBase); break; }
- case byU16: { U16* hashTable = (U16*) tableBase; hashTable[h] = (U16)(p-srcBase); break; }
+ case byPtr: { const BYTE** hashTable = (const BYTE**)tableBase; hashTable[h] = p; return; }
+ case byU32: { U32* hashTable = (U32*) tableBase; hashTable[h] = (U32)(p-srcBase); return; }
+ case byU16: { U16* hashTable = (U16*) tableBase; hashTable[h] = (U16)(p-srcBase); return; }
}
}
@@ -411,36 +432,17 @@ static const BYTE* LZ4_getPosition(const BYTE* p, void* tableBase, tableType_t t
return LZ4_getPositionOnHash(h, tableBase, tableType, srcBase);
}
-static unsigned LZ4_count(const BYTE* pIn, const BYTE* pRef, const BYTE* pInLimit)
-{
- const BYTE* const pStart = pIn;
-
- while (likely(pIn<pInLimit-(STEPSIZE-1)))
- {
- size_t diff = AARCH(pRef) ^ AARCH(pIn);
- if (!diff) { pIn+=STEPSIZE; pRef+=STEPSIZE; continue; }
- pIn += LZ4_NbCommonBytes(diff);
- return (unsigned)(pIn - pStart);
- }
- if (LZ4_64BITS) if ((pIn<(pInLimit-3)) && (A32(pRef) == A32(pIn))) { pIn+=4; pRef+=4; }
- if ((pIn<(pInLimit-1)) && (A16(pRef) == A16(pIn))) { pIn+=2; pRef+=2; }
- if ((pIn<pInLimit) && (*pRef == *pIn)) pIn++;
-
- return (unsigned)(pIn - pStart);
-}
-
-
-static int LZ4_compress_generic(
- void* ctx,
- const char* source,
- char* dest,
- int inputSize,
- int maxOutputSize,
-
- limitedOutput_directive outputLimited,
- tableType_t tableType,
- dict_directive dict,
- dictIssue_directive dictIssue)
+FORCE_INLINE int LZ4_compress_generic(
+ void* const ctx,
+ const char* const source,
+ char* const dest,
+ const int inputSize,
+ const int maxOutputSize,
+ const limitedOutput_directive outputLimited,
+ const tableType_t tableType,
+ const dict_directive dict,
+ const dictIssue_directive dictIssue,
+ const U32 acceleration)
{
LZ4_stream_t_internal* const dictPtr = (LZ4_stream_t_internal*)ctx;
@@ -459,12 +461,11 @@ static int LZ4_compress_generic(
BYTE* op = (BYTE*) dest;
BYTE* const olimit = op + maxOutputSize;
- const int skipStrength = SKIPSTRENGTH;
U32 forwardH;
size_t refDelta=0;
/* Init conditions */
- if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size, too large (or negative) */
+ if ((U32)inputSize > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size, too large (or negative) */
switch(dict)
{
case noDict:
@@ -481,8 +482,8 @@ static int LZ4_compress_generic(
lowLimit = (const BYTE*)source;
break;
}
- if ((tableType == byU16) && (inputSize>=(int)LZ4_64KLIMIT)) return 0; /* Size too large (not within 64K limit) */
- if (inputSize<LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */
+ if ((tableType == byU16) && (inputSize>=LZ4_64Klimit)) return 0; /* Size too large (not within 64K limit) */
+ if (inputSize<LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */
/* First Byte */
LZ4_putPosition(ip, ctx, tableType, base);
@@ -491,26 +492,26 @@ static int LZ4_compress_generic(
/* Main Loop */
for ( ; ; )
{
- const BYTE* ref;
+ const BYTE* match;
BYTE* token;
{
const BYTE* forwardIp = ip;
- unsigned step=1;
- unsigned searchMatchNb = (1U << skipStrength);
+ unsigned step = 1;
+ unsigned searchMatchNb = acceleration << LZ4_skipTrigger;
/* Find a match */
do {
U32 h = forwardH;
ip = forwardIp;
forwardIp += step;
- step = searchMatchNb++ >> skipStrength;
+ step = (searchMatchNb++ >> LZ4_skipTrigger);
if (unlikely(forwardIp > mflimit)) goto _last_literals;
- ref = LZ4_getPositionOnHash(h, ctx, tableType, base);
+ match = LZ4_getPositionOnHash(h, ctx, tableType, base);
if (dict==usingExtDict)
{
- if (ref<(const BYTE*)source)
+ if (match<(const BYTE*)source)
{
refDelta = dictDelta;
lowLimit = dictionary;
@@ -524,13 +525,13 @@ static int LZ4_compress_generic(
forwardH = LZ4_hashPosition(forwardIp, tableType);
LZ4_putPositionOnHash(ip, h, ctx, tableType, base);
- } while ( ((dictIssue==dictSmall) ? (ref < lowRefLimit) : 0)
- || ((tableType==byU16) ? 0 : (ref + MAX_DISTANCE < ip))
- || (A32(ref+refDelta) != A32(ip)) );
+ } while ( ((dictIssue==dictSmall) ? (match < lowRefLimit) : 0)
+ || ((tableType==byU16) ? 0 : (match + MAX_DISTANCE < ip))
+ || (LZ4_read32(match+refDelta) != LZ4_read32(ip)) );
}
/* Catch up */
- while ((ip>anchor) && (ref+refDelta > lowLimit) && (unlikely(ip[-1]==ref[refDelta-1]))) { ip--; ref--; }
+ while ((ip>anchor) && (match+refDelta > lowLimit) && (unlikely(ip[-1]==match[refDelta-1]))) { ip--; match--; }
{
/* Encode Literal length */
@@ -548,12 +549,13 @@ static int LZ4_compress_generic(
else *token = (BYTE)(litLength<<ML_BITS);
/* Copy Literals */
- { BYTE* end = op+litLength; LZ4_WILDCOPY(op,anchor,end); op=end; }
+ LZ4_wildCopy(op, anchor, op+litLength);
+ op+=litLength;
}
_next_match:
/* Encode Offset */
- LZ4_WRITE_LITTLEENDIAN_16(op, (U16)(ip-ref));
+ LZ4_writeLE16(op, (U16)(ip-match)); op+=2;
/* Encode MatchLength */
{
@@ -562,10 +564,10 @@ _next_match:
if ((dict==usingExtDict) && (lowLimit==dictionary))
{
const BYTE* limit;
- ref += refDelta;
- limit = ip + (dictEnd-ref);
+ match += refDelta;
+ limit = ip + (dictEnd-match);
if (limit > matchlimit) limit = matchlimit;
- matchLength = LZ4_count(ip+MINMATCH, ref+MINMATCH, limit);
+ matchLength = LZ4_count(ip+MINMATCH, match+MINMATCH, limit);
ip += MINMATCH + matchLength;
if (ip==limit)
{
@@ -576,14 +578,14 @@ _next_match:
}
else
{
- matchLength = LZ4_count(ip+MINMATCH, ref+MINMATCH, matchlimit);
+ matchLength = LZ4_count(ip+MINMATCH, match+MINMATCH, matchlimit);
ip += MINMATCH + matchLength;
}
+ if ((outputLimited) && (unlikely(op + (1 + LASTLITERALS) + (matchLength>>8) > olimit)))
+ return 0; /* Check output limit */
if (matchLength>=ML_MASK)
{
- if ((outputLimited) && (unlikely(op + (1 + LASTLITERALS) + (matchLength>>8) > olimit)))
- return 0; /* Check output limit */
*token += ML_MASK;
matchLength -= ML_MASK;
for (; matchLength >= 510 ; matchLength-=510) { *op++ = 255; *op++ = 255; }
@@ -602,10 +604,10 @@ _next_match:
LZ4_putPosition(ip-2, ctx, tableType, base);
/* Test next position */
- ref = LZ4_getPosition(ip, ctx, tableType, base);
+ match = LZ4_getPosition(ip, ctx, tableType, base);
if (dict==usingExtDict)
{
- if (ref<(const BYTE*)source)
+ if (match<(const BYTE*)source)
{
refDelta = dictDelta;
lowLimit = dictionary;
@@ -617,9 +619,9 @@ _next_match:
}
}
LZ4_putPosition(ip, ctx, tableType, base);
- if ( ((dictIssue==dictSmall) ? (ref>=lowRefLimit) : 1)
- && (ref+MAX_DISTANCE>=ip)
- && (A32(ref+refDelta)==A32(ip)) )
+ if ( ((dictIssue==dictSmall) ? (match>=lowRefLimit) : 1)
+ && (match+MAX_DISTANCE>=ip)
+ && (LZ4_read32(match+refDelta)==LZ4_read32(ip)) )
{ token=op++; *token=0; goto _next_match; }
/* Prepare next loop */
@@ -629,13 +631,22 @@ _next_match:
_last_literals:
/* Encode Last Literals */
{
- int lastRun = (int)(iend - anchor);
- if ((outputLimited) && (((char*)op - dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize))
+ const size_t lastRun = (size_t)(iend - anchor);
+ if ((outputLimited) && ((op - (BYTE*)dest) + lastRun + 1 + ((lastRun+255-RUN_MASK)/255) > (U32)maxOutputSize))
return 0; /* Check output limit */
- if (lastRun>=(int)RUN_MASK) { *op++=(RUN_MASK<<ML_BITS); lastRun-=RUN_MASK; for(; lastRun >= 255 ; lastRun-=255) *op++ = 255; *op++ = (BYTE) lastRun; }
- else *op++ = (BYTE)(lastRun<<ML_BITS);
- memcpy(op, anchor, iend - anchor);
- op += iend-anchor;
+ if (lastRun >= RUN_MASK)
+ {
+ size_t accumulator = lastRun - RUN_MASK;
+ *op++ = RUN_MASK << ML_BITS;
+ for(; accumulator >= 255 ; accumulator-=255) *op++ = 255;
+ *op++ = (BYTE) accumulator;
+ }
+ else
+ {
+ *op++ = (BYTE)(lastRun<<ML_BITS);
+ }
+ memcpy(op, anchor, lastRun);
+ op += lastRun;
}
/* End */
@@ -643,39 +654,271 @@ _last_literals:
}
-int LZ4_compress(const char* source, char* dest, int inputSize)
+int LZ4_compress_fast_extState(void* state, const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
+{
+ LZ4_resetStream((LZ4_stream_t*)state);
+ if (acceleration < 1) acceleration = ACCELERATION_DEFAULT;
+
+ if (maxOutputSize >= LZ4_compressBound(inputSize))
+ {
+ if (inputSize < LZ4_64Klimit)
+ return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue, acceleration);
+ else
+ return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration);
+ }
+ else
+ {
+ if (inputSize < LZ4_64Klimit)
+ return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration);
+ else
+ return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration);
+ }
+}
+
+
+int LZ4_compress_fast(const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
{
#if (HEAPMODE)
- void* ctx = ALLOCATOR(LZ4_STREAMSIZE_U32, 4); /* Aligned on 4-bytes boundaries */
+ void* ctxPtr = ALLOCATOR(1, sizeof(LZ4_stream_t)); /* malloc-calloc always properly aligned */
#else
- U32 ctx[LZ4_STREAMSIZE_U32] = {0}; /* Ensure data is aligned on 4-bytes boundaries */
+ LZ4_stream_t ctx;
+ void* ctxPtr = &ctx;
#endif
- int result;
- if (inputSize < (int)LZ4_64KLIMIT)
- result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue);
- else
- result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, 0, notLimited, LZ4_64BITS ? byU32 : byPtr, noDict, noDictIssue);
+ int result = LZ4_compress_fast_extState(ctxPtr, source, dest, inputSize, maxOutputSize, acceleration);
#if (HEAPMODE)
- FREEMEM(ctx);
+ FREEMEM(ctxPtr);
#endif
return result;
}
-int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize)
+
+int LZ4_compress_default(const char* source, char* dest, int inputSize, int maxOutputSize)
+{
+ return LZ4_compress_fast(source, dest, inputSize, maxOutputSize, 1);
+}
+
+
+/* hidden debug function */
+/* strangely enough, gcc generates faster code when this function is uncommented, even if unused */
+int LZ4_compress_fast_force(const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
+{
+ LZ4_stream_t ctx;
+
+ LZ4_resetStream(&ctx);
+
+ if (inputSize < LZ4_64Klimit)
+ return LZ4_compress_generic(&ctx, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue, acceleration);
+ else
+ return LZ4_compress_generic(&ctx, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64bits() ? byU32 : byPtr, noDict, noDictIssue, acceleration);
+}
+
+
+/********************************
+* destSize variant
+********************************/
+
+static int LZ4_compress_destSize_generic(
+ void* const ctx,
+ const char* const src,
+ char* const dst,
+ int* const srcSizePtr,
+ const int targetDstSize,
+ const tableType_t tableType)
+{
+ const BYTE* ip = (const BYTE*) src;
+ const BYTE* base = (const BYTE*) src;
+ const BYTE* lowLimit = (const BYTE*) src;
+ const BYTE* anchor = ip;
+ const BYTE* const iend = ip + *srcSizePtr;
+ const BYTE* const mflimit = iend - MFLIMIT;
+ const BYTE* const matchlimit = iend - LASTLITERALS;
+
+ BYTE* op = (BYTE*) dst;
+ BYTE* const oend = op + targetDstSize;
+ BYTE* const oMaxLit = op + targetDstSize - 2 /* offset */ - 8 /* because 8+MINMATCH==MFLIMIT */ - 1 /* token */;
+ BYTE* const oMaxMatch = op + targetDstSize - (LASTLITERALS + 1 /* token */);
+ BYTE* const oMaxSeq = oMaxLit - 1 /* token */;
+
+ U32 forwardH;
+
+
+ /* Init conditions */
+ if (targetDstSize < 1) return 0; /* Impossible to store anything */
+ if ((U32)*srcSizePtr > (U32)LZ4_MAX_INPUT_SIZE) return 0; /* Unsupported input size, too large (or negative) */
+ if ((tableType == byU16) && (*srcSizePtr>=LZ4_64Klimit)) return 0; /* Size too large (not within 64K limit) */
+ if (*srcSizePtr<LZ4_minLength) goto _last_literals; /* Input too small, no compression (all literals) */
+
+ /* First Byte */
+ *srcSizePtr = 0;
+ LZ4_putPosition(ip, ctx, tableType, base);
+ ip++; forwardH = LZ4_hashPosition(ip, tableType);
+
+ /* Main Loop */
+ for ( ; ; )
+ {
+ const BYTE* match;
+ BYTE* token;
+ {
+ const BYTE* forwardIp = ip;
+ unsigned step = 1;
+ unsigned searchMatchNb = 1 << LZ4_skipTrigger;
+
+ /* Find a match */
+ do {
+ U32 h = forwardH;
+ ip = forwardIp;
+ forwardIp += step;
+ step = (searchMatchNb++ >> LZ4_skipTrigger);
+
+ if (unlikely(forwardIp > mflimit))
+ goto _last_literals;
+
+ match = LZ4_getPositionOnHash(h, ctx, tableType, base);
+ forwardH = LZ4_hashPosition(forwardIp, tableType);
+ LZ4_putPositionOnHash(ip, h, ctx, tableType, base);
+
+ } while ( ((tableType==byU16) ? 0 : (match + MAX_DISTANCE < ip))
+ || (LZ4_read32(match) != LZ4_read32(ip)) );
+ }
+
+ /* Catch up */
+ while ((ip>anchor) && (match > lowLimit) && (unlikely(ip[-1]==match[-1]))) { ip--; match--; }
+
+ {
+ /* Encode Literal length */
+ unsigned litLength = (unsigned)(ip - anchor);
+ token = op++;
+ if (op + ((litLength+240)/255) + litLength > oMaxLit)
+ {
+ /* Not enough space for a last match */
+ op--;
+ goto _last_literals;
+ }
+ if (litLength>=RUN_MASK)
+ {
+ unsigned len = litLength - RUN_MASK;
+ *token=(RUN_MASK<<ML_BITS);
+ for(; len >= 255 ; len-=255) *op++ = 255;
+ *op++ = (BYTE)len;
+ }
+ else *token = (BYTE)(litLength<<ML_BITS);
+
+ /* Copy Literals */
+ LZ4_wildCopy(op, anchor, op+litLength);
+ op += litLength;
+ }
+
+_next_match:
+ /* Encode Offset */
+ LZ4_writeLE16(op, (U16)(ip-match)); op+=2;
+
+ /* Encode MatchLength */
+ {
+ size_t matchLength;
+
+ matchLength = LZ4_count(ip+MINMATCH, match+MINMATCH, matchlimit);
+
+ if (op + ((matchLength+240)/255) > oMaxMatch)
+ {
+ /* Match description too long : reduce it */
+ matchLength = (15-1) + (oMaxMatch-op) * 255;
+ }
+ //printf("offset %5i, matchLength%5i \n", (int)(ip-match), matchLength + MINMATCH);
+ ip += MINMATCH + matchLength;
+
+ if (matchLength>=ML_MASK)
+ {
+ *token += ML_MASK;
+ matchLength -= ML_MASK;
+ while (matchLength >= 255) { matchLength-=255; *op++ = 255; }
+ *op++ = (BYTE)matchLength;
+ }
+ else *token += (BYTE)(matchLength);
+ }
+
+ anchor = ip;
+
+ /* Test end of block */
+ if (ip > mflimit) break;
+ if (op > oMaxSeq) break;
+
+ /* Fill table */
+ LZ4_putPosition(ip-2, ctx, tableType, base);
+
+ /* Test next position */
+ match = LZ4_getPosition(ip, ctx, tableType, base);
+ LZ4_putPosition(ip, ctx, tableType, base);
+ if ( (match+MAX_DISTANCE>=ip)
+ && (LZ4_read32(match)==LZ4_read32(ip)) )
+ { token=op++; *token=0; goto _next_match; }
+
+ /* Prepare next loop */
+ forwardH = LZ4_hashPosition(++ip, tableType);
+ }
+
+_last_literals:
+ /* Encode Last Literals */
+ {
+ size_t lastRunSize = (size_t)(iend - anchor);
+ if (op + 1 /* token */ + ((lastRunSize+240)/255) /* litLength */ + lastRunSize /* literals */ > oend)
+ {
+ /* adapt lastRunSize to fill 'dst' */
+ lastRunSize = (oend-op) - 1;
+ lastRunSize -= (lastRunSize+240)/255;
+ }
+ ip = anchor + lastRunSize;
+
+ if (lastRunSize >= RUN_MASK)
+ {
+ size_t accumulator = lastRunSize - RUN_MASK;
+ *op++ = RUN_MASK << ML_BITS;
+ for(; accumulator >= 255 ; accumulator-=255) *op++ = 255;
+ *op++ = (BYTE) accumulator;
+ }
+ else
+ {
+ *op++ = (BYTE)(lastRunSize<<ML_BITS);
+ }
+ memcpy(op, anchor, lastRunSize);
+ op += lastRunSize;
+ }
+
+ /* End */
+ *srcSizePtr = (int) (((const char*)ip)-src);
+ return (int) (((char*)op)-dst);
+}
+
+
+static int LZ4_compress_destSize_extState (void* state, const char* src, char* dst, int* srcSizePtr, int targetDstSize)
+{
+ LZ4_resetStream((LZ4_stream_t*)state);
+
+ if (targetDstSize >= LZ4_compressBound(*srcSizePtr)) /* compression success is guaranteed */
+ {
+ return LZ4_compress_fast_extState(state, src, dst, *srcSizePtr, targetDstSize, 1);
+ }
+ else
+ {
+ if (*srcSizePtr < LZ4_64Klimit)
+ return LZ4_compress_destSize_generic(state, src, dst, srcSizePtr, targetDstSize, byU16);
+ else
+ return LZ4_compress_destSize_generic(state, src, dst, srcSizePtr, targetDstSize, LZ4_64bits() ? byU32 : byPtr);
+ }
+}
+
+
+int LZ4_compress_destSize(const char* src, char* dst, int* srcSizePtr, int targetDstSize)
{
#if (HEAPMODE)
- void* ctx = ALLOCATOR(LZ4_STREAMSIZE_U32, 4); /* Aligned on 4-bytes boundaries */
+ void* ctx = ALLOCATOR(1, sizeof(LZ4_stream_t)); /* malloc-calloc always properly aligned */
#else
- U32 ctx[LZ4_STREAMSIZE_U32] = {0}; /* Ensure data is aligned on 4-bytes boundaries */
+ LZ4_stream_t ctxBody;
+ void* ctx = &ctxBody;
#endif
- int result;
- if (inputSize < (int)LZ4_64KLIMIT)
- result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue);
- else
- result = LZ4_compress_generic((void*)ctx, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64BITS ? byU32 : byPtr, noDict, noDictIssue);
+ int result = LZ4_compress_destSize_extState(ctx, src, dst, srcSizePtr, targetDstSize);
#if (HEAPMODE)
FREEMEM(ctx);
@@ -684,27 +927,24 @@ int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, in
}
-/*****************************************
- Experimental : Streaming functions
-*****************************************/
-/*
- * LZ4_initStream
- * Use this function once, to init a newly allocated LZ4_stream_t structure
- * Return : 1 if OK, 0 if error
- */
-void LZ4_resetStream (LZ4_stream_t* LZ4_stream)
-{
- MEM_INIT(LZ4_stream, 0, sizeof(LZ4_stream_t));
-}
+/********************************
+* Streaming functions
+********************************/
LZ4_stream_t* LZ4_createStream(void)
{
- LZ4_stream_t* lz4s = (LZ4_stream_t*)ALLOCATOR(4, LZ4_STREAMSIZE_U32);
+ LZ4_stream_t* lz4s = (LZ4_stream_t*)ALLOCATOR(8, LZ4_STREAMSIZE_U64);
+ LZ4_STATIC_ASSERT(LZ4_STREAMSIZE >= sizeof(LZ4_stream_t_internal)); /* A compilation error here means LZ4_STREAMSIZE is not large enough */
LZ4_resetStream(lz4s);
return lz4s;
}
+void LZ4_resetStream (LZ4_stream_t* LZ4_stream)
+{
+ MEM_INIT(LZ4_stream, 0, sizeof(LZ4_stream_t));
+}
+
int LZ4_freeStream (LZ4_stream_t* LZ4_stream)
{
FREEMEM(LZ4_stream);
@@ -712,6 +952,7 @@ int LZ4_freeStream (LZ4_stream_t* LZ4_stream)
}
+#define HASH_UNIT sizeof(size_t)
int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize)
{
LZ4_stream_t_internal* dict = (LZ4_stream_t_internal*) LZ4_dict;
@@ -719,29 +960,30 @@ int LZ4_loadDict (LZ4_stream_t* LZ4_dict, const char* dictionary, int dictSize)
const BYTE* const dictEnd = p + dictSize;
const BYTE* base;
- LZ4_STATIC_ASSERT(LZ4_STREAMSIZE >= sizeof(LZ4_stream_t_internal)); /* A compilation error here means LZ4_STREAMSIZE is not large enough */
- if (dict->initCheck) LZ4_resetStream(LZ4_dict); /* Uninitialized structure detected */
+ if ((dict->initCheck) || (dict->currentOffset > 1 GB)) /* Uninitialized structure, or reuse overflow */
+ LZ4_resetStream(LZ4_dict);
- if (dictSize < MINMATCH)
+ if (dictSize < (int)HASH_UNIT)
{
dict->dictionary = NULL;
dict->dictSize = 0;
- return 1;
+ return 0;
}
- if (p <= dictEnd - 64 KB) p = dictEnd - 64 KB;
+ if ((dictEnd - p) > 64 KB) p = dictEnd - 64 KB;
+ dict->currentOffset += 64 KB;
base = p - dict->currentOffset;
dict->dictionary = p;
dict->dictSize = (U32)(dictEnd - p);
dict->currentOffset += dict->dictSize;
- while (p <= dictEnd-MINMATCH)
+ while (p <= dictEnd-HASH_UNIT)
{
- LZ4_putPosition(p, dict, byU32, base);
+ LZ4_putPosition(p, dict->hashTable, byU32, base);
p+=3;
}
- return 1;
+ return dict->dictSize;
}
@@ -766,8 +1008,7 @@ static void LZ4_renormDictT(LZ4_stream_t_internal* LZ4_dict, const BYTE* src)
}
-FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* source, char* dest, int inputSize,
- int maxOutputSize, limitedOutput_directive limit)
+int LZ4_compress_fast_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize, int acceleration)
{
LZ4_stream_t_internal* streamPtr = (LZ4_stream_t_internal*)LZ4_stream;
const BYTE* const dictEnd = streamPtr->dictionary + streamPtr->dictSize;
@@ -776,6 +1017,7 @@ FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* so
if (streamPtr->initCheck) return 0; /* Uninitialized structure detected */
if ((streamPtr->dictSize>0) && (smallest>dictEnd)) smallest = dictEnd;
LZ4_renormDictT(streamPtr, smallest);
+ if (acceleration < 1) acceleration = ACCELERATION_DEFAULT;
/* Check overlapping input/dictionary space */
{
@@ -794,9 +1036,9 @@ FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* so
{
int result;
if ((streamPtr->dictSize < 64 KB) && (streamPtr->dictSize < streamPtr->currentOffset))
- result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, withPrefix64k, dictSmall);
+ result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, withPrefix64k, dictSmall, acceleration);
else
- result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, withPrefix64k, noDictIssue);
+ result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, withPrefix64k, noDictIssue, acceleration);
streamPtr->dictSize += (U32)inputSize;
streamPtr->currentOffset += (U32)inputSize;
return result;
@@ -806,9 +1048,9 @@ FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* so
{
int result;
if ((streamPtr->dictSize < 64 KB) && (streamPtr->dictSize < streamPtr->currentOffset))
- result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, usingExtDict, dictSmall);
+ result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, usingExtDict, dictSmall, acceleration);
else
- result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limit, byU32, usingExtDict, noDictIssue);
+ result = LZ4_compress_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput, byU32, usingExtDict, noDictIssue, acceleration);
streamPtr->dictionary = (const BYTE*)source;
streamPtr->dictSize = (U32)inputSize;
streamPtr->currentOffset += (U32)inputSize;
@@ -816,18 +1058,8 @@ FORCE_INLINE int LZ4_compress_continue_generic (void* LZ4_stream, const char* so
}
}
-int LZ4_compress_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize)
-{
- return LZ4_compress_continue_generic(LZ4_stream, source, dest, inputSize, 0, notLimited);
-}
-int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize)
-{
- return LZ4_compress_continue_generic(LZ4_stream, source, dest, inputSize, maxOutputSize, limitedOutput);
-}
-
-
-/* Hidden debug function, to force separate dictionary mode */
+/* Hidden debug function, to force external dictionary mode */
int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_dict, const char* source, char* dest, int inputSize)
{
LZ4_stream_t_internal* streamPtr = (LZ4_stream_t_internal*)LZ4_dict;
@@ -838,7 +1070,7 @@ int LZ4_compress_forceExtDict (LZ4_stream_t* LZ4_dict, const char* source, char*
if (smallest > (const BYTE*) source) smallest = (const BYTE*) source;
LZ4_renormDictT((LZ4_stream_t_internal*)LZ4_dict, smallest);
- result = LZ4_compress_generic(LZ4_dict, source, dest, inputSize, 0, notLimited, byU32, usingExtDict, noDictIssue);
+ result = LZ4_compress_generic(LZ4_dict, source, dest, inputSize, 0, notLimited, byU32, usingExtDict, noDictIssue, 1);
streamPtr->dictionary = (const BYTE*)source;
streamPtr->dictSize = (U32)inputSize;
@@ -866,9 +1098,9 @@ int LZ4_saveDict (LZ4_stream_t* LZ4_dict, char* safeBuffer, int dictSize)
-/****************************
- Decompression functions
-****************************/
+/*******************************
+* Decompression functions
+*******************************/
/*
* This generic decompression function cover all use cases.
* It shall be instantiated several times, using different sets of directives
@@ -876,8 +1108,8 @@ int LZ4_saveDict (LZ4_stream_t* LZ4_dict, char* safeBuffer, int dictSize)
* in order to remove useless branches during compilation optimization.
*/
FORCE_INLINE int LZ4_decompress_generic(
- const char* source,
- char* dest,
+ const char* const source,
+ char* const dest,
int inputSize,
int outputSize, /* If endOnInput==endOnInputSize, this value is the max size of Output Buffer. */
@@ -885,20 +1117,20 @@ FORCE_INLINE int LZ4_decompress_generic(
int partialDecoding, /* full, partial */
int targetOutputSize, /* only used if partialDecoding==partial */
int dict, /* noDict, withPrefix64k, usingExtDict */
- const char* dictStart, /* only if dict==usingExtDict */
- int dictSize /* note : = 0 if noDict */
+ const BYTE* const lowPrefix, /* == dest if dict == noDict */
+ const BYTE* const dictStart, /* only if dict==usingExtDict */
+ const size_t dictSize /* note : = 0 if noDict */
)
{
/* Local Variables */
- const BYTE* restrict ip = (const BYTE*) source;
- const BYTE* ref;
+ const BYTE* ip = (const BYTE*) source;
const BYTE* const iend = ip + inputSize;
BYTE* op = (BYTE*) dest;
BYTE* const oend = op + outputSize;
BYTE* cpy;
BYTE* oexit = op + targetOutputSize;
- const BYTE* const lowLimit = (const BYTE*)dest - dictSize;
+ const BYTE* const lowLimit = lowPrefix - dictSize;
const BYTE* const dictEnd = (const BYTE*)dictStart + dictSize;
const size_t dec32table[] = {4, 1, 2, 1, 4, 4, 4, 4};
@@ -919,8 +1151,9 @@ FORCE_INLINE int LZ4_decompress_generic(
{
unsigned token;
size_t length;
+ const BYTE* match;
- /* get runlength */
+ /* get literal length */
token = *ip++;
if ((length=(token>>ML_BITS)) == RUN_MASK)
{
@@ -931,8 +1164,8 @@ FORCE_INLINE int LZ4_decompress_generic(
length += s;
}
while (likely((endOnInput)?ip<iend-RUN_MASK:1) && (s==255));
- if ((safeDecode) && LZ4_32BITS && unlikely((size_t)(op+length)<(size_t)(op))) goto _output_error; /* overflow detection */
- if ((safeDecode) && LZ4_32BITS && unlikely((size_t)(ip+length)<(size_t)(ip))) goto _output_error; /* overflow detection */
+ if ((safeDecode) && unlikely((size_t)(op+length)<(size_t)(op))) goto _output_error; /* overflow detection */
+ if ((safeDecode) && unlikely((size_t)(ip+length)<(size_t)(ip))) goto _output_error; /* overflow detection */
}
/* copy literals */
@@ -955,14 +1188,16 @@ FORCE_INLINE int LZ4_decompress_generic(
op += length;
break; /* Necessarily EOF, due to parsing restrictions */
}
- LZ4_WILDCOPY(op, ip, cpy); ip -= (op-cpy); op = cpy;
+ LZ4_wildCopy(op, ip, cpy);
+ ip += length; op = cpy;
/* get offset */
- LZ4_READ_LITTLEENDIAN_16(ref,cpy,ip); ip+=2;
- if ((checkOffset) && (unlikely(ref < lowLimit))) goto _output_error; /* Error : offset outside destination buffer */
+ match = cpy - LZ4_readLE16(ip); ip+=2;
+ if ((checkOffset) && (unlikely(match < lowLimit))) goto _output_error; /* Error : offset outside destination buffer */
/* get matchlength */
- if ((length=(token&ML_MASK)) == ML_MASK)
+ length = token & ML_MASK;
+ if (length == ML_MASK)
{
unsigned s;
do
@@ -971,36 +1206,37 @@ FORCE_INLINE int LZ4_decompress_generic(
s = *ip++;
length += s;
} while (s==255);
- if ((safeDecode) && LZ4_32BITS && unlikely((size_t)(op+length)<(size_t)op)) goto _output_error; /* overflow detection */
+ if ((safeDecode) && unlikely((size_t)(op+length)<(size_t)op)) goto _output_error; /* overflow detection */
}
length += MINMATCH;
/* check external dictionary */
- if ((dict==usingExtDict) && (ref < (BYTE* const)dest))
+ if ((dict==usingExtDict) && (match < lowPrefix))
{
- if (unlikely(op+length > oend-LASTLITERALS)) goto _output_error;
+ if (unlikely(op+length > oend-LASTLITERALS)) goto _output_error; /* doesn't respect parsing restriction */
- if (length <= (size_t)(dest-(char*)ref))
+ if (length <= (size_t)(lowPrefix-match))
{
- ref = dictEnd - (dest-(char*)ref);
- memcpy(op, ref, length);
- op += length;
+ /* match can be copied as a single segment from external dictionary */
+ match = dictEnd - (lowPrefix-match);
+ memmove(op, match, length); op += length;
}
else
{
- size_t copySize = (size_t)(dest-(char*)ref);
+ /* match encompass external dictionary and current segment */
+ size_t copySize = (size_t)(lowPrefix-match);
memcpy(op, dictEnd - copySize, copySize);
op += copySize;
copySize = length - copySize;
- if (copySize > (size_t)((char*)op-dest)) /* overlap */
+ if (copySize > (size_t)(op-lowPrefix)) /* overlap within current segment */
{
BYTE* const endOfMatch = op + copySize;
- const BYTE* copyFrom = (BYTE*)dest;
+ const BYTE* copyFrom = lowPrefix;
while (op < endOfMatch) *op++ = *copyFrom++;
}
else
{
- memcpy(op, dest, copySize);
+ memcpy(op, lowPrefix, copySize);
op += copySize;
}
}
@@ -1009,25 +1245,31 @@ FORCE_INLINE int LZ4_decompress_generic(
/* copy repeated sequence */
cpy = op + length;
- if (unlikely((op-ref)<(int)STEPSIZE))
+ if (unlikely((op-match)<8))
{
- const size_t dec64 = dec64table[op-ref];
- op[0] = ref[0];
- op[1] = ref[1];
- op[2] = ref[2];
- op[3] = ref[3];
- ref += dec32table[op-ref];
- A32(op+4) = A32(ref);
- op += 8; ref -= dec64;
- } else { LZ4_COPY8(op,ref); }
+ const size_t dec64 = dec64table[op-match];
+ op[0] = match[0];
+ op[1] = match[1];
+ op[2] = match[2];
+ op[3] = match[3];
+ match += dec32table[op-match];
+ LZ4_copy4(op+4, match);
+ op += 8; match -= dec64;
+ } else { LZ4_copy8(op, match); op+=8; match+=8; }
if (unlikely(cpy>oend-12))
{
- if (cpy > oend-LASTLITERALS) goto _output_error; /* Error : last 5 bytes must be literals */
- if (op<oend-COPYLENGTH) LZ4_WILDCOPY(op, ref, (oend-COPYLENGTH));
- while(op<cpy) *op++=*ref++;
+ if (cpy > oend-LASTLITERALS) goto _output_error; /* Error : last LASTLITERALS bytes must be literals */
+ if (op < oend-8)
+ {
+ LZ4_wildCopy(op, match, oend-8);
+ match += (oend-8) - op;
+ op = oend-8;
+ }
+ while (op<cpy) *op++ = *match++;
}
- else LZ4_WILDCOPY(op, ref, cpy);
+ else
+ LZ4_wildCopy(op, match, cpy);
op=cpy; /* correction */
}
@@ -1035,35 +1277,38 @@ FORCE_INLINE int LZ4_decompress_generic(
if (endOnInput)
return (int) (((char*)op)-dest); /* Nb of output bytes decoded */
else
- return (int) (((char*)ip)-source); /* Nb of input bytes read */
+ return (int) (((const char*)ip)-source); /* Nb of input bytes read */
/* Overflow error detected */
_output_error:
- return (int) (-(((char*)ip)-source))-1;
+ return (int) (-(((const char*)ip)-source))-1;
}
int LZ4_decompress_safe(const char* source, char* dest, int compressedSize, int maxDecompressedSize)
{
- return LZ4_decompress_generic(source, dest, compressedSize, maxDecompressedSize, endOnInputSize, full, 0, noDict, NULL, 0);
+ return LZ4_decompress_generic(source, dest, compressedSize, maxDecompressedSize, endOnInputSize, full, 0, noDict, (BYTE*)dest, NULL, 0);
}
int LZ4_decompress_safe_partial(const char* source, char* dest, int compressedSize, int targetOutputSize, int maxDecompressedSize)
{
- return LZ4_decompress_generic(source, dest, compressedSize, maxDecompressedSize, endOnInputSize, partial, targetOutputSize, noDict, NULL, 0);
+ return LZ4_decompress_generic(source, dest, compressedSize, maxDecompressedSize, endOnInputSize, partial, targetOutputSize, noDict, (BYTE*)dest, NULL, 0);
}
int LZ4_decompress_fast(const char* source, char* dest, int originalSize)
{
- return LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, withPrefix64k, NULL, 64 KB);
+ return LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, withPrefix64k, (BYTE*)(dest - 64 KB), NULL, 64 KB);
}
+
/* streaming decompression functions */
typedef struct
{
- const char* dictionary;
- int dictSize;
+ const BYTE* externalDict;
+ size_t extDictSize;
+ const BYTE* prefixEnd;
+ size_t prefixSize;
} LZ4_streamDecode_t_internal;
/*
@@ -1073,8 +1318,7 @@ typedef struct
*/
LZ4_streamDecode_t* LZ4_createStreamDecode(void)
{
- LZ4_streamDecode_t* lz4s = (LZ4_streamDecode_t*) ALLOCATOR(sizeof(U32), LZ4_STREAMDECODESIZE_U32);
- MEM_INIT(lz4s, 0, LZ4_STREAMDECODESIZE);
+ LZ4_streamDecode_t* lz4s = (LZ4_streamDecode_t*) ALLOCATOR(1, sizeof(LZ4_streamDecode_t));
return lz4s;
}
@@ -1094,8 +1338,10 @@ int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream)
int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize)
{
LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode;
- lz4sd->dictionary = dictionary;
- lz4sd->dictSize = dictSize;
+ lz4sd->prefixSize = (size_t) dictSize;
+ lz4sd->prefixEnd = (const BYTE*) dictionary + dictSize;
+ lz4sd->externalDict = NULL;
+ lz4sd->extDictSize = 0;
return 1;
}
@@ -1104,23 +1350,32 @@ int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dicti
These decoding functions allow decompression of multiple blocks in "streaming" mode.
Previously decoded blocks must still be available at the memory position where they were decoded.
If it's not possible, save the relevant part of decoded data into a safe buffer,
- and indicate where it stands using LZ4_setDictDecode()
+ and indicate where it stands using LZ4_setStreamDecode()
*/
int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxOutputSize)
{
LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode;
int result;
- result = LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, usingExtDict, lz4sd->dictionary, lz4sd->dictSize);
- if (result <= 0) return result;
- if (lz4sd->dictionary + lz4sd->dictSize == dest)
+ if (lz4sd->prefixEnd == (BYTE*)dest)
{
- lz4sd->dictSize += result;
+ result = LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize,
+ endOnInputSize, full, 0,
+ usingExtDict, lz4sd->prefixEnd - lz4sd->prefixSize, lz4sd->externalDict, lz4sd->extDictSize);
+ if (result <= 0) return result;
+ lz4sd->prefixSize += result;
+ lz4sd->prefixEnd += result;
}
else
{
- lz4sd->dictionary = dest;
- lz4sd->dictSize = result;
+ lz4sd->extDictSize = lz4sd->prefixSize;
+ lz4sd->externalDict = lz4sd->prefixEnd - lz4sd->extDictSize;
+ result = LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize,
+ endOnInputSize, full, 0,
+ usingExtDict, (BYTE*)dest, lz4sd->externalDict, lz4sd->extDictSize);
+ if (result <= 0) return result;
+ lz4sd->prefixSize = result;
+ lz4sd->prefixEnd = (BYTE*)dest + result;
}
return result;
@@ -1131,16 +1386,25 @@ int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const ch
LZ4_streamDecode_t_internal* lz4sd = (LZ4_streamDecode_t_internal*) LZ4_streamDecode;
int result;
- result = LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, usingExtDict, lz4sd->dictionary, lz4sd->dictSize);
- if (result <= 0) return result;
- if (lz4sd->dictionary + lz4sd->dictSize == dest)
+ if (lz4sd->prefixEnd == (BYTE*)dest)
{
- lz4sd->dictSize += result;
+ result = LZ4_decompress_generic(source, dest, 0, originalSize,
+ endOnOutputSize, full, 0,
+ usingExtDict, lz4sd->prefixEnd - lz4sd->prefixSize, lz4sd->externalDict, lz4sd->extDictSize);
+ if (result <= 0) return result;
+ lz4sd->prefixSize += originalSize;
+ lz4sd->prefixEnd += originalSize;
}
else
{
- lz4sd->dictionary = dest;
- lz4sd->dictSize = result;
+ lz4sd->extDictSize = lz4sd->prefixSize;
+ lz4sd->externalDict = (BYTE*)dest - lz4sd->extDictSize;
+ result = LZ4_decompress_generic(source, dest, 0, originalSize,
+ endOnOutputSize, full, 0,
+ usingExtDict, (BYTE*)dest, lz4sd->externalDict, lz4sd->extDictSize);
+ if (result <= 0) return result;
+ lz4sd->prefixSize = originalSize;
+ lz4sd->prefixEnd = (BYTE*)dest + originalSize;
}
return result;
@@ -1157,34 +1421,44 @@ Advanced decoding functions :
FORCE_INLINE int LZ4_decompress_usingDict_generic(const char* source, char* dest, int compressedSize, int maxOutputSize, int safe, const char* dictStart, int dictSize)
{
if (dictSize==0)
- return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, noDict, NULL, 64 KB);
- if ((dictStart+dictSize == dest) && (dictSize >= (int)(64 KB - 1)))
- return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, withPrefix64k, NULL, 64 KB);
- return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, usingExtDict, dictStart, dictSize);
+ return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, noDict, (BYTE*)dest, NULL, 0);
+ if (dictStart+dictSize == dest)
+ {
+ if (dictSize >= (int)(64 KB - 1))
+ return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, withPrefix64k, (BYTE*)dest-64 KB, NULL, 0);
+ return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, noDict, (BYTE*)dest-dictSize, NULL, 0);
+ }
+ return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, safe, full, 0, usingExtDict, (BYTE*)dest, (const BYTE*)dictStart, dictSize);
}
int LZ4_decompress_safe_usingDict(const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize)
{
- //return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, usingExtDict, dictStart, dictSize);
return LZ4_decompress_usingDict_generic(source, dest, compressedSize, maxOutputSize, 1, dictStart, dictSize);
}
int LZ4_decompress_fast_usingDict(const char* source, char* dest, int originalSize, const char* dictStart, int dictSize)
{
- //return LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, usingExtDict, dictStart, dictSize);
return LZ4_decompress_usingDict_generic(source, dest, 0, originalSize, 0, dictStart, dictSize);
}
/* debug function */
int LZ4_decompress_safe_forceExtDict(const char* source, char* dest, int compressedSize, int maxOutputSize, const char* dictStart, int dictSize)
{
- return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, usingExtDict, dictStart, dictSize);
+ return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, usingExtDict, (BYTE*)dest, (const BYTE*)dictStart, dictSize);
}
/***************************************************
- Obsolete Functions
+* Obsolete Functions
***************************************************/
+/* obsolete compression functions */
+int LZ4_compress_limitedOutput(const char* source, char* dest, int inputSize, int maxOutputSize) { return LZ4_compress_default(source, dest, inputSize, maxOutputSize); }
+int LZ4_compress(const char* source, char* dest, int inputSize) { return LZ4_compress_default(source, dest, inputSize, LZ4_compressBound(inputSize)); }
+int LZ4_compress_limitedOutput_withState (void* state, const char* src, char* dst, int srcSize, int dstSize) { return LZ4_compress_fast_extState(state, src, dst, srcSize, dstSize, 1); }
+int LZ4_compress_withState (void* state, const char* src, char* dst, int srcSize) { return LZ4_compress_fast_extState(state, src, dst, srcSize, LZ4_compressBound(srcSize), 1); }
+int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_stream, const char* src, char* dst, int srcSize, int maxDstSize) { return LZ4_compress_fast_continue(LZ4_stream, src, dst, srcSize, maxDstSize, 1); }
+int LZ4_compress_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize) { return LZ4_compress_fast_continue(LZ4_stream, source, dest, inputSize, LZ4_compressBound(inputSize), 1); }
+
/*
These function names are deprecated and should no longer be used.
They are only provided here for compatibility with older user programs.
@@ -1199,69 +1473,44 @@ int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize,
int LZ4_sizeofStreamState() { return LZ4_STREAMSIZE; }
-static void LZ4_init(LZ4_stream_t_internal* lz4ds, const BYTE* base)
+static void LZ4_init(LZ4_stream_t_internal* lz4ds, BYTE* base)
{
MEM_INIT(lz4ds, 0, LZ4_STREAMSIZE);
lz4ds->bufferStart = base;
}
-int LZ4_resetStreamState(void* state, const char* inputBuffer)
+int LZ4_resetStreamState(void* state, char* inputBuffer)
{
if ((((size_t)state) & 3) != 0) return 1; /* Error : pointer is not aligned on 4-bytes boundary */
- LZ4_init((LZ4_stream_t_internal*)state, (const BYTE*)inputBuffer);
+ LZ4_init((LZ4_stream_t_internal*)state, (BYTE*)inputBuffer);
return 0;
}
-void* LZ4_create (const char* inputBuffer)
+void* LZ4_create (char* inputBuffer)
{
- void* lz4ds = ALLOCATOR(4, LZ4_STREAMSIZE_U32);
- LZ4_init ((LZ4_stream_t_internal*)lz4ds, (const BYTE*)inputBuffer);
+ void* lz4ds = ALLOCATOR(8, LZ4_STREAMSIZE_U64);
+ LZ4_init ((LZ4_stream_t_internal*)lz4ds, (BYTE*)inputBuffer);
return lz4ds;
}
char* LZ4_slideInputBuffer (void* LZ4_Data)
{
- LZ4_stream_t_internal* lz4ds = (LZ4_stream_t_internal*)LZ4_Data;
-
- LZ4_saveDict((LZ4_stream_t*)LZ4_Data, (char*)lz4ds->bufferStart, 64 KB);
-
- return (char*)(lz4ds->bufferStart + 64 KB);
-}
-
-/* Obsolete compresson functions using User-allocated state */
-
-int LZ4_sizeofState() { return LZ4_STREAMSIZE; }
-
-int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize)
-{
- if (((size_t)(state)&3) != 0) return 0; /* Error : state is not aligned on 4-bytes boundary */
- MEM_INIT(state, 0, LZ4_STREAMSIZE);
-
- if (inputSize < (int)LZ4_64KLIMIT)
- return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, byU16, noDict, noDictIssue);
- else
- return LZ4_compress_generic(state, source, dest, inputSize, 0, notLimited, LZ4_64BITS ? byU32 : byPtr, noDict, noDictIssue);
-}
-
-int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize)
-{
- if (((size_t)(state)&3) != 0) return 0; /* Error : state is not aligned on 4-bytes boundary */
- MEM_INIT(state, 0, LZ4_STREAMSIZE);
-
- if (inputSize < (int)LZ4_64KLIMIT)
- return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, byU16, noDict, noDictIssue);
- else
- return LZ4_compress_generic(state, source, dest, inputSize, maxOutputSize, limitedOutput, LZ4_64BITS ? byU32 : byPtr, noDict, noDictIssue);
+ LZ4_stream_t_internal* ctx = (LZ4_stream_t_internal*)LZ4_Data;
+ int dictSize = LZ4_saveDict((LZ4_stream_t*)LZ4_Data, (char*)ctx->bufferStart, 64 KB);
+ return (char*)(ctx->bufferStart + dictSize);
}
/* Obsolete streaming decompression functions */
int LZ4_decompress_safe_withPrefix64k(const char* source, char* dest, int compressedSize, int maxOutputSize)
{
- return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, withPrefix64k, NULL, 64 KB);
+ return LZ4_decompress_generic(source, dest, compressedSize, maxOutputSize, endOnInputSize, full, 0, withPrefix64k, (BYTE*)dest - 64 KB, NULL, 64 KB);
}
int LZ4_decompress_fast_withPrefix64k(const char* source, char* dest, int originalSize)
{
- return LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, withPrefix64k, NULL, 64 KB);
+ return LZ4_decompress_generic(source, dest, 0, originalSize, endOnOutputSize, full, 0, withPrefix64k, (BYTE*)dest - 64 KB, NULL, 64 KB);
}
+
+#endif /* LZ4_COMMONDEFS_ONLY */
+
diff --git a/src/grt/fst/lz4.h b/src/grt/fst/lz4.h
index 6e64c99ab..3e7400225 100644
--- a/src/grt/fst/lz4.h
+++ b/src/grt/fst/lz4.h
@@ -1,7 +1,8 @@
/*
LZ4 - Fast LZ compression algorithm
Header File
- Copyright (C) 2011-2014, Yann Collet.
+ Copyright (C) 2011-2015, Yann Collet.
+
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
Redistribution and use in source and binary forms, with or without
@@ -38,22 +39,22 @@ extern "C" {
#endif
/*
- * lz4.h provides raw compression format functions, for optimal performance and integration into programs.
- * If you need to generate data using an inter-operable format (respecting the framing specification),
- * please use lz4frame.h instead.
+ * lz4.h provides block compression functions, and gives full buffer control to programmer.
+ * If you need to generate inter-operable compressed data (respecting LZ4 frame specification),
+ * and can let the library handle its own memory, please use lz4frame.h instead.
*/
/**************************************
- Version
+* Version
**************************************/
-#define LZ4_VERSION_MAJOR 1 /* for major interface/format changes */
-#define LZ4_VERSION_MINOR 3 /* for minor interface/format changes */
+#define LZ4_VERSION_MAJOR 1 /* for breaking interface changes */
+#define LZ4_VERSION_MINOR 7 /* for new (non-breaking) interface capabilities */
#define LZ4_VERSION_RELEASE 1 /* for tweaks, bug-fixes, or development */
#define LZ4_VERSION_NUMBER (LZ4_VERSION_MAJOR *100*100 + LZ4_VERSION_MINOR *100 + LZ4_VERSION_RELEASE)
int LZ4_versionNumber (void);
/**************************************
- Tuning parameter
+* Tuning parameter
**************************************/
/*
* LZ4_MEMORY_USAGE :
@@ -66,77 +67,90 @@ int LZ4_versionNumber (void);
/**************************************
- Simple Functions
+* Simple Functions
**************************************/
-int LZ4_compress (const char* source, char* dest, int sourceSize);
+int LZ4_compress_default(const char* source, char* dest, int sourceSize, int maxDestSize);
int LZ4_decompress_safe (const char* source, char* dest, int compressedSize, int maxDecompressedSize);
/*
-LZ4_compress() :
- Compresses 'sourceSize' bytes from 'source' into 'dest'.
- Destination buffer must be already allocated,
- and must be sized to handle worst cases situations (input data not compressible)
- Worst case size evaluation is provided by function LZ4_compressBound()
- inputSize : Max supported value is LZ4_MAX_INPUT_SIZE
- return : the number of bytes written in buffer dest
- or 0 if the compression fails
+LZ4_compress_default() :
+ Compresses 'sourceSize' bytes from buffer 'source'
+ into already allocated 'dest' buffer of size 'maxDestSize'.
+ Compression is guaranteed to succeed if 'maxDestSize' >= LZ4_compressBound(sourceSize).
+ It also runs faster, so it's a recommended setting.
+ If the function cannot compress 'source' into a more limited 'dest' budget,
+ compression stops *immediately*, and the function result is zero.
+ As a consequence, 'dest' content is not valid.
+ This function never writes outside 'dest' buffer, nor read outside 'source' buffer.
+ sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE
+ maxDestSize : full or partial size of buffer 'dest' (which must be already allocated)
+ return : the number of bytes written into buffer 'dest' (necessarily <= maxOutputSize)
+ or 0 if compression fails
LZ4_decompress_safe() :
- compressedSize : is obviously the source size
- maxDecompressedSize : is the size of the destination buffer, which must be already allocated.
- return : the number of bytes decompressed into the destination buffer (necessarily <= maxDecompressedSize)
- If the destination buffer is not large enough, decoding will stop and output an error code (<0).
+ compressedSize : is the precise full size of the compressed block.
+ maxDecompressedSize : is the size of destination buffer, which must be already allocated.
+ return : the number of bytes decompressed into destination buffer (necessarily <= maxDecompressedSize)
+ If destination buffer is not large enough, decoding will stop and output an error code (<0).
If the source stream is detected malformed, the function will stop decoding and return a negative result.
- This function is protected against buffer overflow exploits,
- and never writes outside of output buffer, nor reads outside of input buffer.
- It is also protected against malicious data packets.
+ This function is protected against buffer overflow exploits, including malicious data packets.
+ It never writes outside output buffer, nor reads outside input buffer.
*/
/**************************************
- Advanced Functions
+* Advanced Functions
**************************************/
#define LZ4_MAX_INPUT_SIZE 0x7E000000 /* 2 113 929 216 bytes */
-#define LZ4_COMPRESSBOUND(isize) ((unsigned int)(isize) > (unsigned int)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
+#define LZ4_COMPRESSBOUND(isize) ((unsigned)(isize) > (unsigned)LZ4_MAX_INPUT_SIZE ? 0 : (isize) + ((isize)/255) + 16)
/*
LZ4_compressBound() :
Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible)
- This function is primarily useful for memory allocation purposes (output buffer size).
+ This function is primarily useful for memory allocation purposes (destination buffer size).
Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example).
-
- isize : is the input size. Max supported value is LZ4_MAX_INPUT_SIZE
- return : maximum output size in a "worst case" scenario
- or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
+ Note that LZ4_compress_default() compress faster when dest buffer size is >= LZ4_compressBound(srcSize)
+ inputSize : max supported value is LZ4_MAX_INPUT_SIZE
+ return : maximum output size in a "worst case" scenario
+ or 0, if input size is too large ( > LZ4_MAX_INPUT_SIZE)
*/
-int LZ4_compressBound(int isize);
-
+int LZ4_compressBound(int inputSize);
/*
-LZ4_compress_limitedOutput() :
- Compress 'sourceSize' bytes from 'source' into an output buffer 'dest' of maximum size 'maxOutputSize'.
- If it cannot achieve it, compression will stop, and result of the function will be zero.
- This saves time and memory on detecting non-compressible (or barely compressible) data.
- This function never writes outside of provided output buffer.
-
- sourceSize : Max supported value is LZ4_MAX_INPUT_VALUE
- maxOutputSize : is the size of the destination buffer (which must be already allocated)
- return : the number of bytes written in buffer 'dest'
- or 0 if compression fails
+LZ4_compress_fast() :
+ Same as LZ4_compress_default(), but allows to select an "acceleration" factor.
+ The larger the acceleration value, the faster the algorithm, but also the lesser the compression.
+ It's a trade-off. It can be fine tuned, with each successive value providing roughly +~3% to speed.
+ An acceleration value of "1" is the same as regular LZ4_compress_default()
+ Values <= 0 will be replaced by ACCELERATION_DEFAULT (see lz4.c), which is 1.
*/
-int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
+int LZ4_compress_fast (const char* source, char* dest, int sourceSize, int maxDestSize, int acceleration);
/*
-LZ4_compress_withState() :
- Same compression functions, but using an externally allocated memory space to store compression state.
+LZ4_compress_fast_extState() :
+ Same compression function, just using an externally allocated memory space to store compression state.
Use LZ4_sizeofState() to know how much memory must be allocated,
- and then, provide it as 'void* state' to compression functions.
+ and allocate it on 8-bytes boundaries (using malloc() typically).
+ Then, provide it as 'void* state' to compression function.
*/
int LZ4_sizeofState(void);
-int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
-int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
+int LZ4_compress_fast_extState (void* state, const char* source, char* dest, int inputSize, int maxDestSize, int acceleration);
+
+
+/*
+LZ4_compress_destSize() :
+ Reverse the logic, by compressing as much data as possible from 'source' buffer
+ into already allocated buffer 'dest' of size 'targetDestSize'.
+ This function either compresses the entire 'source' content into 'dest' if it's large enough,
+ or fill 'dest' buffer completely with as much data as possible from 'source'.
+ *sourceSizePtr : will be modified to indicate how many bytes where read from 'source' to fill 'dest'.
+ New value is necessarily <= old value.
+ return : Nb bytes written into 'dest' (necessarily <= targetDestSize)
+ or 0 if compression fails
+*/
+int LZ4_compress_destSize (const char* source, char* dest, int* sourceSizePtr, int targetDestSize);
/*
@@ -152,7 +166,6 @@ LZ4_decompress_fast() :
*/
int LZ4_decompress_fast (const char* source, char* dest, int originalSize);
-
/*
LZ4_decompress_safe_partial() :
This function decompress a compressed block of size 'compressedSize' at position 'source'
@@ -169,104 +182,108 @@ int LZ4_decompress_safe_partial (const char* source, char* dest, int compressedS
/***********************************************
- Experimental Streaming Compression Functions
+* Streaming Compression Functions
***********************************************/
-
-#define LZ4_STREAMSIZE_U32 ((1 << (LZ4_MEMORY_USAGE-2)) + 8)
-#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U32 * sizeof(unsigned int))
+#define LZ4_STREAMSIZE_U64 ((1 << (LZ4_MEMORY_USAGE-3)) + 4)
+#define LZ4_STREAMSIZE (LZ4_STREAMSIZE_U64 * sizeof(long long))
/*
* LZ4_stream_t
* information structure to track an LZ4 stream.
* important : init this structure content before first use !
+ * note : only allocated directly the structure if you are statically linking LZ4
+ * If you are using liblz4 as a DLL, please use below construction methods instead.
*/
-typedef struct { unsigned int table[LZ4_STREAMSIZE_U32]; } LZ4_stream_t;
+typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t;
/*
* LZ4_resetStream
* Use this function to init an allocated LZ4_stream_t structure
*/
-void LZ4_resetStream (LZ4_stream_t* LZ4_streamPtr);
+void LZ4_resetStream (LZ4_stream_t* streamPtr);
/*
- * If you prefer dynamic allocation methods,
* LZ4_createStream will allocate and initialize an LZ4_stream_t structure
* LZ4_freeStream releases its memory.
+ * In the context of a DLL (liblz4), please use these methods rather than the static struct.
+ * They are more future proof, in case of a change of LZ4_stream_t size.
*/
LZ4_stream_t* LZ4_createStream(void);
-int LZ4_freeStream (LZ4_stream_t* LZ4_stream);
+int LZ4_freeStream (LZ4_stream_t* streamPtr);
/*
* LZ4_loadDict
* Use this function to load a static dictionary into LZ4_stream.
* Any previous data will be forgotten, only 'dictionary' will remain in memory.
* Loading a size of 0 is allowed.
- * Return : 1 if OK, 0 if error
+ * Return : dictionary size, in bytes (necessarily <= 64 KB)
*/
-int LZ4_loadDict (LZ4_stream_t* LZ4_stream, const char* dictionary, int dictSize);
+int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
/*
- * LZ4_compress_continue
- * Compress data block 'source', using blocks compressed before as dictionary to improve compression ratio
- * Previous data blocks are assumed to still be present at their previous location.
+ * LZ4_compress_fast_continue
+ * Compress buffer content 'src', using data from previously compressed blocks as dictionary to improve compression ratio.
+ * Important : Previous data blocks are assumed to still be present and unmodified !
+ * 'dst' buffer must be already allocated.
+ * If maxDstSize >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
+ * If not, and if compressed data cannot fit into 'dst' buffer size, compression stops, and function returns a zero.
*/
-int LZ4_compress_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize);
-
-/*
- * LZ4_compress_limitedOutput_continue
- * Same as before, but also specify a maximum target compressed size (maxOutputSize)
- * If objective cannot be met, compression exits, and returns a zero.
- */
-int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_stream, const char* source, char* dest, int inputSize, int maxOutputSize);
+int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int maxDstSize, int acceleration);
/*
* LZ4_saveDict
* If previously compressed data block is not guaranteed to remain available at its memory location
* save it into a safer place (char* safeBuffer)
* Note : you don't need to call LZ4_loadDict() afterwards,
- * dictionary is immediately usable, you can therefore call again LZ4_compress_continue()
- * Return : dictionary size in bytes, or 0 if error
- * Note : any dictSize > 64 KB will be interpreted as 64KB.
+ * dictionary is immediately usable, you can therefore call LZ4_compress_fast_continue()
+ * Return : saved dictionary size in bytes (necessarily <= dictSize), or 0 if error
*/
-int LZ4_saveDict (LZ4_stream_t* LZ4_stream, char* safeBuffer, int dictSize);
+int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dictSize);
/************************************************
- Experimental Streaming Decompression Functions
+* Streaming Decompression Functions
************************************************/
-#define LZ4_STREAMDECODESIZE_U32 4
-#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U32 * sizeof(unsigned int))
+#define LZ4_STREAMDECODESIZE_U64 4
+#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
+typedef struct { unsigned long long table[LZ4_STREAMDECODESIZE_U64]; } LZ4_streamDecode_t;
/*
* LZ4_streamDecode_t
* information structure to track an LZ4 stream.
- * important : init this structure content using LZ4_setStreamDecode or memset() before first use !
+ * init this structure content using LZ4_setStreamDecode or memset() before first use !
+ *
+ * In the context of a DLL (liblz4) please prefer usage of construction methods below.
+ * They are more future proof, in case of a change of LZ4_streamDecode_t size in the future.
+ * LZ4_createStreamDecode will allocate and initialize an LZ4_streamDecode_t structure
+ * LZ4_freeStreamDecode releases its memory.
*/
-typedef struct { unsigned int table[LZ4_STREAMDECODESIZE_U32]; } LZ4_streamDecode_t;
+LZ4_streamDecode_t* LZ4_createStreamDecode(void);
+int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
/*
* LZ4_setStreamDecode
* Use this function to instruct where to find the dictionary.
- * This function can be used to specify a static dictionary,
- * or to instruct where to find some previously decoded data saved into a different memory space.
- * Setting a size of 0 is allowed (same effect as no dictionary).
+ * Setting a size of 0 is allowed (same effect as reset).
* Return : 1 if OK, 0 if error
*/
int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
/*
- * If you prefer dynamic allocation methods,
- * LZ4_createStreamDecode will allocate and initialize an LZ4_streamDecode_t structure
- * LZ4_freeStreamDecode releases its memory.
- */
-LZ4_streamDecode_t* LZ4_createStreamDecode(void);
-int LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
-
-/*
*_continue() :
These decoding functions allow decompression of multiple blocks in "streaming" mode.
- Previously decoded blocks must still be available at the memory position where they were decoded.
- If it's not possible, save the relevant part of decoded data into a safe buffer,
- and indicate where its new address using LZ4_setStreamDecode()
+ Previously decoded blocks *must* remain available at the memory position where they were decoded (up to 64 KB)
+ In the case of a ring buffers, decoding buffer must be either :
+ - Exactly same size as encoding buffer, with same update rule (block boundaries at same positions)
+ In which case, the decoding & encoding ring buffer can have any size, including very small ones ( < 64 KB).
+ - Larger than encoding buffer, by a minimum of maxBlockSize more bytes.
+ maxBlockSize is implementation dependent. It's the maximum size you intend to compress into a single block.
+ In which case, encoding and decoding buffers do not need to be synchronized,
+ and encoding ring buffer can have any size, including small ones ( < 64 KB).
+ - _At least_ 64 KB + 8 bytes + maxBlockSize.
+ In which case, encoding and decoding buffers do not need to be synchronized,
+ and encoding ring buffer can have any size, including larger than decoding buffer.
+ Whenever these conditions are not possible, save the last 64KB of decoded data into a safe buffer,
+ and indicate where it is saved using LZ4_setStreamDecode()
*/
int LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int compressedSize, int maxDecompressedSize);
int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* source, char* dest, int originalSize);
@@ -276,8 +293,8 @@ int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const ch
Advanced decoding functions :
*_usingDict() :
These decoding functions work the same as
- a combination of LZ4_setDictDecode() followed by LZ4_decompress_x_continue()
- They don't use nor update an LZ4_streamDecode_t structure.
+ a combination of LZ4_setStreamDecode() followed by LZ4_decompress_x_continue()
+ They are stand-alone. They don't need nor update an LZ4_streamDecode_t structure.
*/
int LZ4_decompress_safe_usingDict (const char* source, char* dest, int compressedSize, int maxDecompressedSize, const char* dictStart, int dictSize);
int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalSize, const char* dictStart, int dictSize);
@@ -285,37 +302,57 @@ int LZ4_decompress_fast_usingDict (const char* source, char* dest, int originalS
/**************************************
- Obsolete Functions
+* Obsolete Functions
**************************************/
-/*
-Obsolete decompression functions
-These function names are deprecated and should no longer be used.
-They are only provided here for compatibility with older user programs.
-- LZ4_uncompress is the same as LZ4_decompress_fast
-- LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe
-These function prototypes are now disabled; uncomment them if you really need them.
-It is highly recommended to stop using these functions and migrated to newer ones */
+/* Deprecate Warnings */
+/* Should these warnings messages be a problem,
+ it is generally possible to disable them,
+ with -Wno-deprecated-declarations for gcc
+ or _CRT_SECURE_NO_WARNINGS in Visual for example.
+ You can also define LZ4_DEPRECATE_WARNING_DEFBLOCK. */
+#ifndef LZ4_DEPRECATE_WARNING_DEFBLOCK
+# define LZ4_DEPRECATE_WARNING_DEFBLOCK
+# define LZ4_GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
+# if (LZ4_GCC_VERSION >= 405) || defined(__clang__)
+# define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
+# elif (LZ4_GCC_VERSION >= 301)
+# define LZ4_DEPRECATED(message) __attribute__((deprecated))
+# elif defined(_MSC_VER)
+# define LZ4_DEPRECATED(message) __declspec(deprecated(message))
+# else
+# pragma message("WARNING: You need to implement LZ4_DEPRECATED for this compiler")
+# define LZ4_DEPRECATED(message)
+# endif
+#endif /* LZ4_DEPRECATE_WARNING_DEFBLOCK */
+
+/* Obsolete compression functions */
+/* These functions are planned to start generate warnings by r131 approximately */
+int LZ4_compress (const char* source, char* dest, int sourceSize);
+int LZ4_compress_limitedOutput (const char* source, char* dest, int sourceSize, int maxOutputSize);
+int LZ4_compress_withState (void* state, const char* source, char* dest, int inputSize);
+int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
+int LZ4_compress_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
+int LZ4_compress_limitedOutput_continue (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
+
+/* Obsolete decompression functions */
+/* These function names are completely deprecated and must no longer be used.
+ They are only provided here for compatibility with older programs.
+ - LZ4_uncompress is the same as LZ4_decompress_fast
+ - LZ4_uncompress_unknownOutputSize is the same as LZ4_decompress_safe
+ These function prototypes are now disabled; uncomment them only if you really need them.
+ It is highly recommended to stop using these prototypes and migrate to maintained ones */
/* int LZ4_uncompress (const char* source, char* dest, int outputSize); */
/* int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize); */
-/*
- * If you prefer dynamic allocation methods,
- * LZ4_createStreamDecode()
- * provides a pointer (void*) towards an initialized LZ4_streamDecode_t structure.
- * LZ4_free just frees it.
- */
-/* void* LZ4_createStreamDecode(void); */
-/*int LZ4_free (void* LZ4_stream); yes, it's the same one as for compression */
-
/* Obsolete streaming functions; use new streaming interface whenever possible */
-void* LZ4_create (const char* inputBuffer);
-int LZ4_sizeofStreamState(void);
-int LZ4_resetStreamState(void* state, const char* inputBuffer);
-char* LZ4_slideInputBuffer (void* state);
+LZ4_DEPRECATED("use LZ4_createStream() instead") void* LZ4_create (char* inputBuffer);
+LZ4_DEPRECATED("use LZ4_createStream() instead") int LZ4_sizeofStreamState(void);
+LZ4_DEPRECATED("use LZ4_resetStream() instead") int LZ4_resetStreamState(void* state, char* inputBuffer);
+LZ4_DEPRECATED("use LZ4_saveDict() instead") char* LZ4_slideInputBuffer (void* state);
/* Obsolete streaming decoding functions */
-int LZ4_decompress_safe_withPrefix64k (const char* source, char* dest, int compressedSize, int maxOutputSize);
-int LZ4_decompress_fast_withPrefix64k (const char* source, char* dest, int originalSize);
+LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
+LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
#if defined (__cplusplus)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 00:17:11 +0000