mirror of
https://github.com/wiidev/usbloadergx.git
synced 2024-09-17 04:34:54 +02:00
345 lines
11 KiB
C
345 lines
11 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(file, fileOut, fileOutTmp, nRecovered, bytesRecovered)
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const char* file;const char* fileOut;const char* fileOutTmp;uLong* nRecovered;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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{
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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[256];
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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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{
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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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{
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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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{
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offset += 30;
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}
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else
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{
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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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{
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if (fread(filename, 1, fnsize, fpZip) == fnsize)
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{
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if (fwrite(filename, 1, fnsize, fpOut) == fnsize)
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{
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offset += fnsize;
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}
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else
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{
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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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{
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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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{
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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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{
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if (fread(extra, 1, extsize, fpZip) == extsize)
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{
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if (fwrite(extra, 1, extsize, fpOut) == extsize)
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{
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offset += extsize;
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}
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else
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{
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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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{
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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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{
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dataSize = uncpsize;
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}
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if (dataSize > 0)
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{
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char* data = malloc(dataSize);
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if (data != NULL)
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{
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if ((int) fread(data, 1, dataSize, fpZip) == dataSize)
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{
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if ((int) fwrite(data, 1, dataSize, fpOut) == dataSize)
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{
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offset += dataSize;
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totalBytes += dataSize;
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}
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else
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{
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err = Z_ERRNO;
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}
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}
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else
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{
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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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{
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break;
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}
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}
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else
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{
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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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{
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offsetCD += 46;
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/* Filename */
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if (fnsize > 0)
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{
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if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize)
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{
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offsetCD += fnsize;
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}
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else
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{
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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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{
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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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{
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if (fwrite(extra, 1, extsize, fpOutCD) == extsize)
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{
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offsetCD += extsize;
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}
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else
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{
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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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{
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if ((int) fwrite(comment, 1, comsize, fpOutCD) == comsize)
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{
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offsetCD += comsize;
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}
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else
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{
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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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else
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{
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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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}
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else
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{
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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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{
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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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{
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/* Comment field */
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if (comsize > 0)
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{
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if ((int) fwrite(comment, 1, comsize, fpOutCD) != comsize)
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{
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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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{
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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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{
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fpOutCD = fopen(fileOutTmp, "rb");
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if (fpOutCD != NULL)
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{
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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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{
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if ((int) fwrite(buffer, 1, nRead, fpOut) != nRead)
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{
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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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{
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if (nRecovered != NULL)
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{
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*nRecovered = entries;
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}
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if (bytesRecovered != NULL)
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{
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*bytesRecovered = totalBytes;
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}
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}
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}
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else
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{
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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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