1 /* ----------------------------------------------------------------------- * 2 * 3 * Copyright 2005-2008 H. Peter Anvin - All Rights Reserved 4 * 5 * Permission is hereby granted, free of charge, to any person 6 * obtaining a copy of this software and associated documentation 7 * files (the "Software"), to deal in the Software without 8 * restriction, including without limitation the rights to use, 9 * copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom 11 * the Software is furnished to do so, subject to the following 12 * conditions: 13 * 14 * The above copyright notice and this permission notice shall 15 * be included in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 19 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 21 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 22 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 24 * OTHER DEALINGS IN THE SOFTWARE. 25 * 26 * ----------------------------------------------------------------------- */ 27 28 /* 29 * floadfile.c 30 * 31 * Read the contents of a data file into a malloc'd buffer 32 */ 33 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <unistd.h> 37 #include <string.h> 38 #include <fcntl.h> 39 #include <sys/stat.h> 40 41 #include <syslinux/loadfile.h> 42 43 #define INCREMENTAL_CHUNK 1024*1024 44 45 int floadfile(FILE * f, void **ptr, size_t * len, const void *prefix, 46 size_t prefix_len) 47 { 48 struct stat st; 49 void *data, *dp; 50 size_t alen, clen, rlen, xlen; 51 52 clen = alen = 0; 53 data = NULL; 54 55 if (fstat(fileno(f), &st)) 56 goto err; 57 58 if (!S_ISREG(st.st_mode)) { 59 /* Not a regular file, we can't assume we know the file size */ 60 if (prefix_len) { 61 clen = alen = prefix_len; 62 data = malloc(prefix_len); 63 if (!data) 64 goto err; 65 66 memcpy(data, prefix, prefix_len); 67 } 68 69 do { 70 alen += INCREMENTAL_CHUNK; 71 dp = realloc(data, alen); 72 if (!dp) 73 goto err; 74 data = dp; 75 76 rlen = fread((char *)data + clen, 1, alen - clen, f); 77 clen += rlen; 78 } while (clen == alen); 79 80 *len = clen; 81 xlen = (clen + LOADFILE_ZERO_PAD - 1) & ~(LOADFILE_ZERO_PAD - 1); 82 dp = realloc(data, xlen); 83 if (dp) 84 data = dp; 85 *ptr = data; 86 } else { 87 *len = clen = st.st_size + prefix_len - ftell(f); 88 xlen = (clen + LOADFILE_ZERO_PAD - 1) & ~(LOADFILE_ZERO_PAD - 1); 89 90 *ptr = data = malloc(xlen); 91 if (!data) 92 return -1; 93 94 memcpy(data, prefix, prefix_len); 95 96 if ((off_t) fread((char *)data + prefix_len, 1, clen - prefix_len, f) 97 != clen - prefix_len) 98 goto err; 99 } 100 101 memset((char *)data + clen, 0, xlen - clen); 102 return 0; 103 104 err: 105 if (data) 106 free(data); 107 return -1; 108 } 109
