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