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/******************************************************************************
* xg_private.c
*
* Helper functions for the rest of the library.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdlib.h>
#include <unistd.h>
#include <zlib.h>
#include <malloc.h>
#include "xg_private.h"
char *xc_read_image(xc_interface *xch,
const char *filename, unsigned long *size)
{
int kernel_fd = -1;
gzFile kernel_gfd = NULL;
char *image = NULL, *tmp;
unsigned int bytes;
if ( (filename == NULL) || (size == NULL) )
return NULL;
if ( (kernel_fd = open(filename, O_RDONLY)) < 0 )
{
PERROR("Could not open kernel image");
goto out;
}
if ( (kernel_gfd = gzdopen(kernel_fd, "rb")) == NULL )
{
PERROR("Could not allocate decompression state for state file");
goto out;
}
*size = 0;
#define CHUNK 1*1024*1024
while(1)
{
if ( (tmp = realloc(image, *size + CHUNK)) == NULL )
{
PERROR("Could not allocate memory for kernel image");
free(image);
image = NULL;
goto out;
}
image = tmp;
bytes = gzread(kernel_gfd, image + *size, CHUNK);
switch (bytes)
{
case -1:
PERROR("Error reading kernel image");
free(image);
image = NULL;
goto out;
case 0: /* EOF */
goto out;
default:
*size += bytes;
break;
}
}
#undef CHUNK
out:
if ( *size == 0 )
{
PERROR("Could not read kernel image");
free(image);
image = NULL;
}
else if ( image )
{
/* Shrink allocation to fit image. */
tmp = realloc(image, *size);
if ( tmp )
image = tmp;
}
if ( kernel_gfd != NULL )
gzclose(kernel_gfd);
else if ( kernel_fd >= 0 )
close(kernel_fd);
return image;
}
char *xc_inflate_buffer(xc_interface *xch,
const char *in_buf, unsigned long in_size,
unsigned long *out_size)
{
int sts;
z_stream zStream;
unsigned long out_len;
char *out_buf;
/* Not compressed? Then return the original buffer. */
if ( ((unsigned char)in_buf[0] != 0x1F) ||
((unsigned char)in_buf[1] != 0x8B) )
{
if ( out_size != NULL )
*out_size = in_size;
return (char *)in_buf;
}
out_len = (unsigned char)in_buf[in_size-4] +
(256 * ((unsigned char)in_buf[in_size-3] +
(256 * ((unsigned char)in_buf[in_size-2] +
(256 * (unsigned char)in_buf[in_size-1])))));
memset(&zStream, 0, sizeof(zStream));
out_buf = malloc(out_len + 16); /* Leave a little extra space */
if ( out_buf == NULL )
{
ERROR("Error mallocing buffer\n");
return NULL;
}
zStream.next_in = (unsigned char *)in_buf;
zStream.avail_in = in_size;
zStream.next_out = (unsigned char *)out_buf;
zStream.avail_out = out_len+16;
sts = inflateInit2(&zStream, (MAX_WBITS+32)); /* +32 means "handle gzip" */
if ( sts != Z_OK )
{
ERROR("inflateInit failed, sts %d\n", sts);
free(out_buf);
return NULL;
}
/* Inflate in one pass/call */
sts = inflate(&zStream, Z_FINISH);
inflateEnd(&zStream);
if ( sts != Z_STREAM_END )
{
ERROR("inflate failed, sts %d\n", sts);
free(out_buf);
return NULL;
}
if ( out_size != NULL )
*out_size = out_len;
return out_buf;
}
/*******************/
int pin_table(
xc_interface *xch, unsigned int type, unsigned long mfn, domid_t dom)
{
struct mmuext_op op;
op.cmd = type;
op.arg1.mfn = mfn;
if ( xc_mmuext_op(xch, &op, 1, dom) < 0 )
return 1;
return 0;
}
/* This is shared between save and restore, and may generally be useful. */
unsigned long csum_page(void *page)
{
int i;
unsigned long *p = page;
unsigned long long sum=0;
for ( i = 0; i < (PAGE_SIZE/sizeof(unsigned long)); i++ )
sum += p[i];
return sum ^ (sum>>32);
}
__attribute__((weak))
int xc_hvm_build(xc_interface *xch,
uint32_t domid,
struct xc_hvm_build_args *hvm_args)
{
errno = ENOSYS;
return -1;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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