| 1 | /* |
| 2 | Additional tools for Minizip |
| 3 | Code: Xavier Roche '2004 |
| 4 | License: Same as ZLIB (www.gzip.org) |
| 5 | */ |
| 6 | |
| 7 | /* Code */ |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <string.h> |
| 11 | #include "zlib.h" |
| 12 | #include "unzip.h" |
| 13 | |
| 14 | #define READ_8(adr) ((unsigned char)*(adr)) |
| 15 | #define READ_16(adr) ( READ_8(adr) | (READ_8(adr+1) << 8) ) |
| 16 | #define READ_32(adr) ( READ_16(adr) | (READ_16((adr)+2) << 16) ) |
| 17 | |
| 18 | #define WRITE_8(buff, n) do { \ |
| 19 | *((unsigned char*)(buff)) = (unsigned char) ((n) & 0xff); \ |
| 20 | } while(0) |
| 21 | #define WRITE_16(buff, n) do { \ |
| 22 | WRITE_8((unsigned char*)(buff), n); \ |
| 23 | WRITE_8(((unsigned char*)(buff)) + 1, (n) >> 8); \ |
| 24 | } while(0) |
| 25 | #define WRITE_32(buff, n) do { \ |
| 26 | WRITE_16((unsigned char*)(buff), (n) & 0xffff); \ |
| 27 | WRITE_16((unsigned char*)(buff) + 2, (n) >> 16); \ |
| 28 | } while(0) |
| 29 | |
| 30 | extern int ZEXPORT unzRepair(file, fileOut, fileOutTmp, nRecovered, bytesRecovered) |
| 31 | const char* file; |
| 32 | const char* fileOut; |
| 33 | const char* fileOutTmp; |
| 34 | uLong* nRecovered; |
| 35 | uLong* bytesRecovered; |
| 36 | { |
| 37 | int err = Z_OK; |
| 38 | FILE* fpZip = fopen(file, "rb"); |
| 39 | FILE* fpOut = fopen(fileOut, "wb"); |
| 40 | FILE* fpOutCD = fopen(fileOutTmp, "wb"); |
| 41 | if (fpZip != NULL && fpOut != NULL) { |
| 42 | int entries = 0; |
| 43 | uLong totalBytes = 0; |
| 44 | char header[30]; |
| 45 | char filename[1024]; |
| 46 | char extra[1024]; |
| 47 | int offset = 0; |
| 48 | int offsetCD = 0; |
| 49 | while ( fread(header, 1, 30, fpZip) == 30 ) { |
| 50 | int currentOffset = offset; |
| 51 | |
| 52 | /* File entry */ |
| 53 | if (READ_32(header) == 0x04034b50) { |
| 54 | unsigned int version = READ_16(header + 4); |
| 55 | unsigned int gpflag = READ_16(header + 6); |
| 56 | unsigned int method = READ_16(header + 8); |
| 57 | unsigned int filetime = READ_16(header + 10); |
| 58 | unsigned int filedate = READ_16(header + 12); |
| 59 | unsigned int crc = READ_32(header + 14); /* crc */ |
| 60 | unsigned int cpsize = READ_32(header + 18); /* compressed size */ |
| 61 | unsigned int uncpsize = READ_32(header + 22); /* uncompressed sz */ |
| 62 | unsigned int fnsize = READ_16(header + 26); /* file name length */ |
| 63 | unsigned int extsize = READ_16(header + 28); /* extra field length */ |
| 64 | filename[0] = extra[0] = '\0'; |
| 65 | |
| 66 | /* Header */ |
| 67 | if (fwrite(header, 1, 30, fpOut) == 30) { |
| 68 | offset += 30; |
| 69 | } else { |
| 70 | err = Z_ERRNO; |
| 71 | break; |
| 72 | } |
| 73 | |
| 74 | /* Filename */ |
| 75 | if (fnsize > 0) { |
| 76 | if (fnsize < sizeof(filename)) { |
| 77 | if (fread(filename, 1, fnsize, fpZip) == fnsize) { |
| 78 | if (fwrite(filename, 1, fnsize, fpOut) == fnsize) { |
| 79 | offset += fnsize; |
| 80 | } else { |
| 81 | err = Z_ERRNO; |
| 82 | break; |
| 83 | } |
| 84 | } else { |
| 85 | err = Z_ERRNO; |
| 86 | break; |
| 87 | } |
| 88 | } else { |
| 89 | err = Z_ERRNO; |
| 90 | break; |
| 91 | } |
| 92 | } else { |
| 93 | err = Z_STREAM_ERROR; |
| 94 | break; |
| 95 | } |
| 96 | |
| 97 | /* Extra field */ |
| 98 | if (extsize > 0) { |
| 99 | if (extsize < sizeof(extra)) { |
| 100 | if (fread(extra, 1, extsize, fpZip) == extsize) { |
| 101 | if (fwrite(extra, 1, extsize, fpOut) == extsize) { |
| 102 | offset += extsize; |
| 103 | } else { |
| 104 | err = Z_ERRNO; |
| 105 | break; |
| 106 | } |
| 107 | } else { |
| 108 | err = Z_ERRNO; |
| 109 | break; |
| 110 | } |
| 111 | } else { |
| 112 | err = Z_ERRNO; |
| 113 | break; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | /* Data */ |
| 118 | { |
| 119 | int dataSize = cpsize; |
| 120 | if (dataSize == 0) { |
| 121 | dataSize = uncpsize; |
| 122 | } |
| 123 | if (dataSize > 0) { |
| 124 | char* data = malloc(dataSize); |
| 125 | if (data != NULL) { |
| 126 | if ((int)fread(data, 1, dataSize, fpZip) == dataSize) { |
| 127 | if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) { |
| 128 | offset += dataSize; |
| 129 | totalBytes += dataSize; |
| 130 | } else { |
| 131 | err = Z_ERRNO; |
| 132 | } |
| 133 | } else { |
| 134 | err = Z_ERRNO; |
| 135 | } |
| 136 | free(data); |
| 137 | if (err != Z_OK) { |
| 138 | break; |
| 139 | } |
| 140 | } else { |
| 141 | err = Z_MEM_ERROR; |
| 142 | break; |
| 143 | } |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | /* Central directory entry */ |
| 148 | { |
| 149 | char header[46]; |
| 150 | char* comment = ""; |
| 151 | int comsize = (int) strlen(comment); |
| 152 | WRITE_32(header, 0x02014b50); |
| 153 | WRITE_16(header + 4, version); |
| 154 | WRITE_16(header + 6, version); |
| 155 | WRITE_16(header + 8, gpflag); |
| 156 | WRITE_16(header + 10, method); |
| 157 | WRITE_16(header + 12, filetime); |
| 158 | WRITE_16(header + 14, filedate); |
| 159 | WRITE_32(header + 16, crc); |
| 160 | WRITE_32(header + 20, cpsize); |
| 161 | WRITE_32(header + 24, uncpsize); |
| 162 | WRITE_16(header + 28, fnsize); |
| 163 | WRITE_16(header + 30, extsize); |
| 164 | WRITE_16(header + 32, comsize); |
| 165 | WRITE_16(header + 34, 0); /* disk # */ |
| 166 | WRITE_16(header + 36, 0); /* int attrb */ |
| 167 | WRITE_32(header + 38, 0); /* ext attrb */ |
| 168 | WRITE_32(header + 42, currentOffset); |
| 169 | /* Header */ |
| 170 | if (fwrite(header, 1, 46, fpOutCD) == 46) { |
| 171 | offsetCD += 46; |
| 172 | |
| 173 | /* Filename */ |
| 174 | if (fnsize > 0) { |
| 175 | if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) { |
| 176 | offsetCD += fnsize; |
| 177 | } else { |
| 178 | err = Z_ERRNO; |
| 179 | break; |
| 180 | } |
| 181 | } else { |
| 182 | err = Z_STREAM_ERROR; |
| 183 | break; |
| 184 | } |
| 185 | |
| 186 | /* Extra field */ |
| 187 | if (extsize > 0) { |
| 188 | if (fwrite(extra, 1, extsize, fpOutCD) == extsize) { |
| 189 | offsetCD += extsize; |
| 190 | } else { |
| 191 | err = Z_ERRNO; |
| 192 | break; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | /* Comment field */ |
| 197 | if (comsize > 0) { |
| 198 | if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) { |
| 199 | offsetCD += comsize; |
| 200 | } else { |
| 201 | err = Z_ERRNO; |
| 202 | break; |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | |
| 207 | } else { |
| 208 | err = Z_ERRNO; |
| 209 | break; |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | /* Success */ |
| 214 | entries++; |
| 215 | |
| 216 | } else { |
| 217 | break; |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | /* Final central directory */ |
| 222 | { |
| 223 | int entriesZip = entries; |
| 224 | char header[22]; |
| 225 | char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools"; |
| 226 | int comsize = (int) strlen(comment); |
| 227 | if (entriesZip > 0xffff) { |
| 228 | entriesZip = 0xffff; |
| 229 | } |
| 230 | WRITE_32(header, 0x06054b50); |
| 231 | WRITE_16(header + 4, 0); /* disk # */ |
| 232 | WRITE_16(header + 6, 0); /* disk # */ |
| 233 | WRITE_16(header + 8, entriesZip); /* hack */ |
| 234 | WRITE_16(header + 10, entriesZip); /* hack */ |
| 235 | WRITE_32(header + 12, offsetCD); /* size of CD */ |
| 236 | WRITE_32(header + 16, offset); /* offset to CD */ |
| 237 | WRITE_16(header + 20, comsize); /* comment */ |
| 238 | |
| 239 | /* Header */ |
| 240 | if (fwrite(header, 1, 22, fpOutCD) == 22) { |
| 241 | |
| 242 | /* Comment field */ |
| 243 | if (comsize > 0) { |
| 244 | if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) { |
| 245 | err = Z_ERRNO; |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | } else { |
| 250 | err = Z_ERRNO; |
| 251 | } |
| 252 | } |
| 253 | |
| 254 | /* Final merge (file + central directory) */ |
| 255 | fclose(fpOutCD); |
| 256 | if (err == Z_OK) { |
| 257 | fpOutCD = fopen(fileOutTmp, "rb"); |
| 258 | if (fpOutCD != NULL) { |
| 259 | int nRead; |
| 260 | char buffer[8192]; |
| 261 | while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) { |
| 262 | if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) { |
| 263 | err = Z_ERRNO; |
| 264 | break; |
| 265 | } |
| 266 | } |
| 267 | fclose(fpOutCD); |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | /* Close */ |
| 272 | fclose(fpZip); |
| 273 | fclose(fpOut); |
| 274 | |
| 275 | /* Wipe temporary file */ |
| 276 | (void)remove(fileOutTmp); |
| 277 | |
| 278 | /* Number of recovered entries */ |
| 279 | if (err == Z_OK) { |
| 280 | if (nRecovered != NULL) { |
| 281 | *nRecovered = entries; |
| 282 | } |
| 283 | if (bytesRecovered != NULL) { |
| 284 | *bytesRecovered = totalBytes; |
| 285 | } |
| 286 | } |
| 287 | } else { |
| 288 | err = Z_STREAM_ERROR; |
| 289 | } |
| 290 | return err; |
| 291 | } |