| /* |
| Additional tools for Minizip |
| Code: Xavier Roche '2004 |
| License: Same as ZLIB (www.gzip.org) |
| */ |
| |
| /* Code */ |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include "zlib.h" |
| #include "unzip.h" |
| |
| #define READ_8(adr) ((unsigned char)*(adr)) |
| #define READ_16(adr) ( READ_8(adr) | (READ_8(adr+1) << 8) ) |
| #define READ_32(adr) ( READ_16(adr) | (READ_16((adr)+2) << 16) ) |
| |
| #define WRITE_8(buff, n) do { \ |
| *((unsigned char*)(buff)) = (unsigned char) ((n) & 0xff); \ |
| } while(0) |
| #define WRITE_16(buff, n) do { \ |
| WRITE_8((unsigned char*)(buff), n); \ |
| WRITE_8(((unsigned char*)(buff)) + 1, (n) >> 8); \ |
| } while(0) |
| #define WRITE_32(buff, n) do { \ |
| WRITE_16((unsigned char*)(buff), (n) & 0xffff); \ |
| WRITE_16((unsigned char*)(buff) + 2, (n) >> 16); \ |
| } while(0) |
| |
| extern int ZEXPORT unzRepair(const char* file, const char* fileOut, const char* fileOutTmp, uLong* nRecovered, uLong* bytesRecovered) { |
| int err = Z_OK; |
| FILE* fpZip = fopen(file, "rb"); |
| FILE* fpOut = fopen(fileOut, "wb"); |
| FILE* fpOutCD = fopen(fileOutTmp, "wb"); |
| if (fpZip != NULL && fpOut != NULL) { |
| int entries = 0; |
| uLong totalBytes = 0; |
| char header[30]; |
| char filename[1024]; |
| char extra[1024]; |
| int offset = 0; |
| int offsetCD = 0; |
| while ( fread(header, 1, 30, fpZip) == 30 ) { |
| int currentOffset = offset; |
| |
| /* File entry */ |
| if (READ_32(header) == 0x04034b50) { |
| unsigned int version = READ_16(header + 4); |
| unsigned int gpflag = READ_16(header + 6); |
| unsigned int method = READ_16(header + 8); |
| unsigned int filetime = READ_16(header + 10); |
| unsigned int filedate = READ_16(header + 12); |
| unsigned int crc = READ_32(header + 14); /* crc */ |
| unsigned int cpsize = READ_32(header + 18); /* compressed size */ |
| unsigned int uncpsize = READ_32(header + 22); /* uncompressed sz */ |
| unsigned int fnsize = READ_16(header + 26); /* file name length */ |
| unsigned int extsize = READ_16(header + 28); /* extra field length */ |
| filename[0] = extra[0] = '\0'; |
| |
| /* Header */ |
| if (fwrite(header, 1, 30, fpOut) == 30) { |
| offset += 30; |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| |
| /* Filename */ |
| if (fnsize > 0) { |
| if (fnsize < sizeof(filename)) { |
| if (fread(filename, 1, fnsize, fpZip) == fnsize) { |
| if (fwrite(filename, 1, fnsize, fpOut) == fnsize) { |
| offset += fnsize; |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| } else { |
| err = Z_STREAM_ERROR; |
| break; |
| } |
| |
| /* Extra field */ |
| if (extsize > 0) { |
| if (extsize < sizeof(extra)) { |
| if (fread(extra, 1, extsize, fpZip) == extsize) { |
| if (fwrite(extra, 1, extsize, fpOut) == extsize) { |
| offset += extsize; |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| } |
| |
| /* Data */ |
| { |
| int dataSize = cpsize; |
| if (dataSize == 0) { |
| dataSize = uncpsize; |
| } |
| if (dataSize > 0) { |
| char* data = malloc(dataSize); |
| if (data != NULL) { |
| if ((int)fread(data, 1, dataSize, fpZip) == dataSize) { |
| if ((int)fwrite(data, 1, dataSize, fpOut) == dataSize) { |
| offset += dataSize; |
| totalBytes += dataSize; |
| } else { |
| err = Z_ERRNO; |
| } |
| } else { |
| err = Z_ERRNO; |
| } |
| free(data); |
| if (err != Z_OK) { |
| break; |
| } |
| } else { |
| err = Z_MEM_ERROR; |
| break; |
| } |
| } |
| } |
| |
| /* Central directory entry */ |
| { |
| char header[46]; |
| char* comment = ""; |
| int comsize = (int) strlen(comment); |
| WRITE_32(header, 0x02014b50); |
| WRITE_16(header + 4, version); |
| WRITE_16(header + 6, version); |
| WRITE_16(header + 8, gpflag); |
| WRITE_16(header + 10, method); |
| WRITE_16(header + 12, filetime); |
| WRITE_16(header + 14, filedate); |
| WRITE_32(header + 16, crc); |
| WRITE_32(header + 20, cpsize); |
| WRITE_32(header + 24, uncpsize); |
| WRITE_16(header + 28, fnsize); |
| WRITE_16(header + 30, extsize); |
| WRITE_16(header + 32, comsize); |
| WRITE_16(header + 34, 0); /* disk # */ |
| WRITE_16(header + 36, 0); /* int attrb */ |
| WRITE_32(header + 38, 0); /* ext attrb */ |
| WRITE_32(header + 42, currentOffset); |
| /* Header */ |
| if (fwrite(header, 1, 46, fpOutCD) == 46) { |
| offsetCD += 46; |
| |
| /* Filename */ |
| if (fnsize > 0) { |
| if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize) { |
| offsetCD += fnsize; |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| } else { |
| err = Z_STREAM_ERROR; |
| break; |
| } |
| |
| /* Extra field */ |
| if (extsize > 0) { |
| if (fwrite(extra, 1, extsize, fpOutCD) == extsize) { |
| offsetCD += extsize; |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| } |
| |
| /* Comment field */ |
| if (comsize > 0) { |
| if ((int)fwrite(comment, 1, comsize, fpOutCD) == comsize) { |
| offsetCD += comsize; |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| } |
| |
| |
| } else { |
| err = Z_ERRNO; |
| break; |
| } |
| } |
| |
| /* Success */ |
| entries++; |
| |
| } else { |
| break; |
| } |
| } |
| |
| /* Final central directory */ |
| { |
| int entriesZip = entries; |
| char header[22]; |
| char* comment = ""; // "ZIP File recovered by zlib/minizip/mztools"; |
| int comsize = (int) strlen(comment); |
| if (entriesZip > 0xffff) { |
| entriesZip = 0xffff; |
| } |
| WRITE_32(header, 0x06054b50); |
| WRITE_16(header + 4, 0); /* disk # */ |
| WRITE_16(header + 6, 0); /* disk # */ |
| WRITE_16(header + 8, entriesZip); /* hack */ |
| WRITE_16(header + 10, entriesZip); /* hack */ |
| WRITE_32(header + 12, offsetCD); /* size of CD */ |
| WRITE_32(header + 16, offset); /* offset to CD */ |
| WRITE_16(header + 20, comsize); /* comment */ |
| |
| /* Header */ |
| if (fwrite(header, 1, 22, fpOutCD) == 22) { |
| |
| /* Comment field */ |
| if (comsize > 0) { |
| if ((int)fwrite(comment, 1, comsize, fpOutCD) != comsize) { |
| err = Z_ERRNO; |
| } |
| } |
| |
| } else { |
| err = Z_ERRNO; |
| } |
| } |
| |
| /* Final merge (file + central directory) */ |
| fclose(fpOutCD); |
| if (err == Z_OK) { |
| fpOutCD = fopen(fileOutTmp, "rb"); |
| if (fpOutCD != NULL) { |
| int nRead; |
| char buffer[8192]; |
| while ( (nRead = (int)fread(buffer, 1, sizeof(buffer), fpOutCD)) > 0) { |
| if ((int)fwrite(buffer, 1, nRead, fpOut) != nRead) { |
| err = Z_ERRNO; |
| break; |
| } |
| } |
| fclose(fpOutCD); |
| } |
| } |
| |
| /* Close */ |
| fclose(fpZip); |
| fclose(fpOut); |
| |
| /* Wipe temporary file */ |
| (void)remove(fileOutTmp); |
| |
| /* Number of recovered entries */ |
| if (err == Z_OK) { |
| if (nRecovered != NULL) { |
| *nRecovered = entries; |
| } |
| if (bytesRecovered != NULL) { |
| *bytesRecovered = totalBytes; |
| } |
| } |
| } else { |
| err = Z_STREAM_ERROR; |
| } |
| return err; |
| } |
