/* | |
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; | |
} |