?? mztools.c
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/* 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(file, fileOut, fileOutTmp, nRecovered, bytesRecovered)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[256]; 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 (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_STREAM_ERROR; break; } /* Extra field */ if (extsize > 0) { 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; } } /* 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;}?? 快捷鍵說明
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