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/*
lzma2eva - convert lzma-compressed file to AVM EVA bootloader format
Copyright (C) 2007 Enrik Berkhan <Enrik.Berkhan@inka.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <zlib.h> /* crc32 */
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#define checksum_add32(csum, data) \
do { \
csum += (((data) >> 0) & 0x000000FF); \
csum += (((data) >> 8) & 0x000000FF); \
csum += (((data) >> 16) & 0x000000FF); \
csum += (((data) >> 24) & 0x000000FF); \
} while (0)
void
usage(void)
{
fprintf(stderr, "usage: lzma2eva <loadadddr> <entry> <lzmafile> <evafile>\n");
exit(1);
}
void
pexit(const char *msg)
{
perror(msg);
exit(1);
}
/* Read an 8bit value */
static int fread_8(uint8_t *buf, FILE *fd)
{
return (fread(buf, sizeof(*buf), 1, fd) == 1) ? 0 : -1;
}
/* Read a 32bit little endian value and convert to host endianness. */
static int fread_le32(uint32_t *buf, FILE *fd)
{
size_t count;
uint8_t tmp[4];
unsigned int i;
if (fread(tmp, sizeof(tmp), 1, fd) != 1)
return -1;
*buf = 0;
for (i = 0; i < ARRAY_SIZE(tmp); i++)
*buf |= (uint32_t)(tmp[i]) << (i * 8);
return 0;
}
/* Read a 64bit little endian value and convert to host endianness. */
static int fread_le64(uint64_t *buf, FILE *fd)
{
size_t count;
uint8_t tmp[8];
unsigned int i;
if (fread(tmp, sizeof(tmp), 1, fd) != 1)
return -1;
*buf = 0;
for (i = 0; i < ARRAY_SIZE(tmp); i++)
*buf |= (uint64_t)(tmp[i]) << (i * 8);
return 0;
}
/* Write an 8bit value */
static int fwrite_8(uint8_t buf, FILE *fd)
{
return (fwrite(&buf, sizeof(buf), 1, fd) == 1) ? 0 : -1;
}
/* Convert to little endian and write a 32bit value */
static int fwrite_le32(uint32_t buf, FILE *fd)
{
size_t count;
uint8_t tmp[4];
unsigned int i;
for (i = 0; i < ARRAY_SIZE(tmp); i++)
tmp[i] = buf >> (i * 8);
if (fwrite(tmp, sizeof(tmp), 1, fd) != 1)
return -1;
return 0;
}
int
main(int argc, char *argv[])
{
const char *infile, *outfile;
FILE *in, *out;
static const uint8_t buf[4096];
size_t elems;
uint8_t properties;
uint32_t dictsize;
uint64_t datasize;
uint32_t magic = 0xfeed1281L;
uint32_t reclength = 0;
fpos_t reclengthpos;
uint32_t loadaddress = 0;
uint32_t type = 0x075a0201L; /* might be 7Z 2.1? */
uint32_t checksum = 0;
uint32_t compsize = 0;
fpos_t compsizepos;
uint32_t datasize32 = 0;
uint32_t datacrc32 = crc32(0, 0, 0);
uint32_t entry = 0;
if (argc != 5)
usage();
/* "parse" command line */
loadaddress = strtoul(argv[1], 0, 0);
entry = strtoul(argv[2], 0, 0);
infile = argv[3];
outfile = argv[4];
in = fopen(infile, "rb");
if (!in)
pexit("fopen");
out = fopen(outfile, "w+b");
if (!out)
pexit("fopen");
/* read LZMA header */
if (fread_8(&properties, in))
pexit("fread");
if (fread_le32(&dictsize, in))
pexit("fread");
if (fread_le64(&datasize, in))
pexit("fread");
/* write EVA header */
if (fwrite_le32(magic, out))
pexit("fwrite");
if (fgetpos(out, &reclengthpos))
pexit("fgetpos");
if (fwrite_le32(reclength, out))
pexit("fwrite");
if (fwrite_le32(loadaddress, out))
pexit("fwrite");
if (fwrite_le32(type, out))
pexit("fwrite");
/* write EVA LZMA header */
if (fgetpos(out, &compsizepos))
pexit("fgetpos");
if (fwrite_le32(compsize, out))
pexit("fwrite");
/* XXX check length */
datasize32 = (uint32_t)datasize;
if (fwrite_le32(datasize32, out))
pexit("fwrite");
if (fwrite_le32(datacrc32, out))
pexit("fwrite");
/* write modified LZMA header */
if (fwrite_8(properties, out))
pexit("fwrite");
if (fwrite_le32(dictsize, out))
pexit("fwrite");
if (fwrite_le32(0, out))
pexit("fwrite");
/* copy compressed data, calculate crc32 */
while (0 < (elems = fread(&buf, sizeof buf[0], sizeof buf, in))) {
compsize += elems;
if (elems != fwrite(&buf, sizeof buf[0], elems, out))
pexit("fwrite");
datacrc32 = crc32(datacrc32, buf, elems);
}
if (ferror(in))
pexit("fread");
fclose(in);
/* re-write record length */
reclength = compsize + 24;
if (fsetpos(out, &reclengthpos))
pexit("fsetpos");
if (fwrite_le32(reclength, out))
pexit("fwrite");
/* re-write EVA LZMA header including size and data crc */
if (fsetpos(out, &compsizepos))
pexit("fsetpos");
if (fwrite_le32(compsize, out))
pexit("fwrite");
if (fwrite_le32(datasize32, out))
pexit("fwrite");
if (fwrite_le32(datacrc32, out))
pexit("fwrite");
/* calculate record checksum */
checksum += reclength;
checksum += loadaddress;
checksum_add32(checksum, type);
checksum_add32(checksum, compsize);
checksum_add32(checksum, datasize32);
checksum_add32(checksum, datacrc32);
if (fseek(out, 0, SEEK_CUR))
pexit("fseek");
while (0 < (elems = fread(&buf, sizeof buf[0], sizeof buf, out))) {
size_t i;
for (i = 0; i < elems; ++i)
checksum += buf[i];
}
if (ferror(out))
pexit("fread");
if (fseek(out, 0, SEEK_CUR))
pexit("fseek");
checksum = ~checksum + 1;
if (fwrite_le32(checksum, out))
pexit("fwrite");
/* write entry record */
if (fwrite_le32(0, out))
pexit("fwrite");
if (fwrite_le32(entry, out))
pexit("fwrite");
if (fclose(out))
pexit("fclose");
return 0;
}
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