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