286 lines
7.9 KiB
C
286 lines
7.9 KiB
C
/*
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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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/* 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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#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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#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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extern int ZEXPORT unzRepair(const char* file, const char* fileOut, const char* fileOutTmp, uLong* nRecovered, uLong* bytesRecovered) {
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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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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/* 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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} 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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/* Success */
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entries++;
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} else {
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break;
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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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/* Header */
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if (fwrite(header, 1, 22, fpOutCD) == 22) {
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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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} else {
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err = Z_ERRNO;
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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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/* Close */
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fclose(fpZip);
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fclose(fpOut);
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/* Wipe temporary file */
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(void)remove(fileOutTmp);
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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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}
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