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/* ----------------------------------------------------------------------- *
*
* Copyright 2005-2008 H. Peter Anvin - All Rights Reserved
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* floadfile.c
*
* Read the contents of a data file into a malloc'd buffer
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <syslinux/loadfile.h>
#define INCREMENTAL_CHUNK 1024*1024
int floadfile(FILE * f, void **ptr, size_t * len, const void *prefix,
size_t prefix_len)
{
struct stat st;
void *data, *dp;
size_t alen, clen, rlen, xlen;
clen = alen = 0;
data = NULL;
if (fstat(fileno(f), &st))
goto err;
if (!S_ISREG(st.st_mode)) {
/* Not a regular file, we can't assume we know the file size */
if (prefix_len) {
clen = alen = prefix_len;
data = malloc(prefix_len);
if (!data)
goto err;
memcpy(data, prefix, prefix_len);
}
do {
alen += INCREMENTAL_CHUNK;
dp = realloc(data, alen);
if (!dp)
goto err;
data = dp;
rlen = fread((char *)data + clen, 1, alen - clen, f);
clen += rlen;
} while (clen == alen);
*len = clen;
xlen = (clen + LOADFILE_ZERO_PAD - 1) & ~(LOADFILE_ZERO_PAD - 1);
dp = realloc(data, xlen);
if (dp)
data = dp;
*ptr = data;
} else {
*len = clen = st.st_size + prefix_len - ftell(f);
xlen = (clen + LOADFILE_ZERO_PAD - 1) & ~(LOADFILE_ZERO_PAD - 1);
*ptr = data = malloc(xlen);
if (!data)
return -1;
memcpy(data, prefix, prefix_len);
if ((off_t) fread((char *)data + prefix_len, 1, clen - prefix_len, f)
!= clen - prefix_len)
goto err;
}
memset((char *)data + clen, 0, xlen - clen);
return 0;
err:
if (data)
free(data);
return -1;
}
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