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| 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, bytesRecover
ed) |
| 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[256]; |
| 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 (fread(filename, 1, fnsize, fpZip) == fnsize) { |
| 77 if (fwrite(filename, 1, fnsize, fpOut) == fnsize) { |
| 78 offset += fnsize; |
| 79 } else { |
| 80 err = Z_ERRNO; |
| 81 break; |
| 82 } |
| 83 } else { |
| 84 err = Z_ERRNO; |
| 85 break; |
| 86 } |
| 87 } else { |
| 88 err = Z_STREAM_ERROR; |
| 89 break; |
| 90 } |
| 91 |
| 92 /* Extra field */ |
| 93 if (extsize > 0) { |
| 94 if (fread(extra, 1, extsize, fpZip) == extsize) { |
| 95 if (fwrite(extra, 1, extsize, fpOut) == extsize) { |
| 96 offset += extsize; |
| 97 } else { |
| 98 err = Z_ERRNO; |
| 99 break; |
| 100 } |
| 101 } else { |
| 102 err = Z_ERRNO; |
| 103 break; |
| 104 } |
| 105 } |
| 106 |
| 107 /* Data */ |
| 108 { |
| 109 int dataSize = cpsize; |
| 110 if (dataSize == 0) { |
| 111 dataSize = uncpsize; |
| 112 } |
| 113 if (dataSize > 0) { |
| 114 char* data = malloc(dataSize); |
| 115 if (data != NULL) { |
| 116 if ((int)fread(data, 1, dataSize, fpZip) == dataSize) { |
| 117 if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) { |
| 118 offset += dataSize; |
| 119 totalBytes += dataSize; |
| 120 } else { |
| 121 err = Z_ERRNO; |
| 122 } |
| 123 } else { |
| 124 err = Z_ERRNO; |
| 125 } |
| 126 free(data); |
| 127 if (err != Z_OK) { |
| 128 break; |
| 129 } |
| 130 } else { |
| 131 err = Z_MEM_ERROR; |
| 132 break; |
| 133 } |
| 134 } |
| 135 } |
| 136 |
| 137 /* Central directory entry */ |
| 138 { |
| 139 char header[46]; |
| 140 char* comment = ""; |
| 141 int comsize = (int) strlen(comment); |
| 142 WRITE_32(header, 0x02014b50); |
| 143 WRITE_16(header + 4, version); |
| 144 WRITE_16(header + 6, version); |
| 145 WRITE_16(header + 8, gpflag); |
| 146 WRITE_16(header + 10, method); |
| 147 WRITE_16(header + 12, filetime); |
| 148 WRITE_16(header + 14, filedate); |
| 149 WRITE_32(header + 16, crc); |
| 150 WRITE_32(header + 20, cpsize); |
| 151 WRITE_32(header + 24, uncpsize); |
| 152 WRITE_16(header + 28, fnsize); |
| 153 WRITE_16(header + 30, extsize); |
| 154 WRITE_16(header + 32, comsize); |
| 155 WRITE_16(header + 34, 0); /* disk # */ |
| 156 WRITE_16(header + 36, 0); /* int attrb */ |
| 157 WRITE_32(header + 38, 0); /* ext attrb */ |
| 158 WRITE_32(header + 42, currentOffset); |
| 159 /* Header */ |
| 160 if (fwrite(header, 1, 46, fpOutCD) == 46) { |
| 161 offsetCD += 46; |
| 162 |
| 163 /* Filename */ |
| 164 if (fnsize > 0) { |
| 165 if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) { |
| 166 offsetCD += fnsize; |
| 167 } else { |
| 168 err = Z_ERRNO; |
| 169 break; |
| 170 } |
| 171 } else { |
| 172 err = Z_STREAM_ERROR; |
| 173 break; |
| 174 } |
| 175 |
| 176 /* Extra field */ |
| 177 if (extsize > 0) { |
| 178 if (fwrite(extra, 1, extsize, fpOutCD) == extsize) { |
| 179 offsetCD += extsize; |
| 180 } else { |
| 181 err = Z_ERRNO; |
| 182 break; |
| 183 } |
| 184 } |
| 185 |
| 186 /* Comment field */ |
| 187 if (comsize > 0) { |
| 188 if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) { |
| 189 offsetCD += comsize; |
| 190 } else { |
| 191 err = Z_ERRNO; |
| 192 break; |
| 193 } |
| 194 } |
| 195 |
| 196 |
| 197 } else { |
| 198 err = Z_ERRNO; |
| 199 break; |
| 200 } |
| 201 } |
| 202 |
| 203 /* Success */ |
| 204 entries++; |
| 205 |
| 206 } else { |
| 207 break; |
| 208 } |
| 209 } |
| 210 |
| 211 /* Final central directory */ |
| 212 { |
| 213 int entriesZip = entries; |
| 214 char header[22]; |
| 215 char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools"; |
| 216 int comsize = (int) strlen(comment); |
| 217 if (entriesZip > 0xffff) { |
| 218 entriesZip = 0xffff; |
| 219 } |
| 220 WRITE_32(header, 0x06054b50); |
| 221 WRITE_16(header + 4, 0); /* disk # */ |
| 222 WRITE_16(header + 6, 0); /* disk # */ |
| 223 WRITE_16(header + 8, entriesZip); /* hack */ |
| 224 WRITE_16(header + 10, entriesZip); /* hack */ |
| 225 WRITE_32(header + 12, offsetCD); /* size of CD */ |
| 226 WRITE_32(header + 16, offset); /* offset to CD */ |
| 227 WRITE_16(header + 20, comsize); /* comment */ |
| 228 |
| 229 /* Header */ |
| 230 if (fwrite(header, 1, 22, fpOutCD) == 22) { |
| 231 |
| 232 /* Comment field */ |
| 233 if (comsize > 0) { |
| 234 if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) { |
| 235 err = Z_ERRNO; |
| 236 } |
| 237 } |
| 238 |
| 239 } else { |
| 240 err = Z_ERRNO; |
| 241 } |
| 242 } |
| 243 |
| 244 /* Final merge (file + central directory) */ |
| 245 fclose(fpOutCD); |
| 246 if (err == Z_OK) { |
| 247 fpOutCD = fopen(fileOutTmp, "rb"); |
| 248 if (fpOutCD != NULL) { |
| 249 int nRead; |
| 250 char buffer[8192]; |
| 251 while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) { |
| 252 if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) { |
| 253 err = Z_ERRNO; |
| 254 break; |
| 255 } |
| 256 } |
| 257 fclose(fpOutCD); |
| 258 } |
| 259 } |
| 260 |
| 261 /* Close */ |
| 262 fclose(fpZip); |
| 263 fclose(fpOut); |
| 264 |
| 265 /* Wipe temporary file */ |
| 266 (void)remove(fileOutTmp); |
| 267 |
| 268 /* Number of recovered entries */ |
| 269 if (err == Z_OK) { |
| 270 if (nRecovered != NULL) { |
| 271 *nRecovered = entries; |
| 272 } |
| 273 if (bytesRecovered != NULL) { |
| 274 *bytesRecovered = totalBytes; |
| 275 } |
| 276 } |
| 277 } else { |
| 278 err = Z_STREAM_ERROR; |
| 279 } |
| 280 return err; |
| 281 } |
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