usbloadergx/source/unzip/mztools.c

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/*
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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)
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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;
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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;
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while (fread(header, 1, 30, fpZip) == 30)
{
int currentOffset = offset;
/* File entry */
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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 */
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if (fwrite(header, 1, 30, fpOut) == 30)
{
offset += 30;
}
else
{
err = Z_ERRNO;
break;
}
/* Filename */
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if (fnsize > 0)
{
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if (fread(filename, 1, fnsize, fpZip) == fnsize)
{
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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 */
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if (extsize > 0)
{
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if (fread(extra, 1, extsize, fpZip) == extsize)
{
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if (fwrite(extra, 1, extsize, fpOut) == extsize)
{
offset += extsize;
}
else
{
err = Z_ERRNO;
break;
}
}
else
{
err = Z_ERRNO;
break;
}
}
/* Data */
{
int dataSize = cpsize;
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if (dataSize == 0)
{
dataSize = uncpsize;
}
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if (dataSize > 0)
{
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char* data = malloc(dataSize);
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)
{
offset += dataSize;
totalBytes += dataSize;
}
else
{
err = Z_ERRNO;
}
}
else
{
err = Z_ERRNO;
}
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free(data);
if (err != Z_OK)
{
break;
}
}
else
{
err = Z_MEM_ERROR;
break;
}
}
}
/* Central directory entry */
{
char header[46];
char* comment = "";
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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 );
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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 */
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if (fwrite(header, 1, 46, fpOutCD) == 46)
{
offsetCD += 46;
/* Filename */
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if (fnsize > 0)
{
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if (fwrite(filename, 1, fnsize, fpOutCD) == fnsize)
{
offsetCD += fnsize;
}
else
{
err = Z_ERRNO;
break;
}
}
else
{
err = Z_STREAM_ERROR;
break;
}
/* Extra field */
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if (extsize > 0)
{
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if (fwrite(extra, 1, extsize, fpOutCD) == extsize)
{
offsetCD += extsize;
}
else
{
err = Z_ERRNO;
break;
}
}
/* Comment field */
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if (comsize > 0)
{
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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";
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int comsize = (int) strlen(comment);
if (entriesZip > 0xffff)
{
entriesZip = 0xffff;
}
WRITE_32( header, 0x06054b50 );
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WRITE_16( header + 4, 0 ); /* disk # */
WRITE_16( header + 6, 0 ); /* disk # */
WRITE_16( header + 8, entriesZip ); /* hack */
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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 */
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if (fwrite(header, 1, 22, fpOutCD) == 22)
{
/* Comment field */
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if (comsize > 0)
{
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if ((int) fwrite(comment, 1, comsize, fpOutCD) != comsize)
{
err = Z_ERRNO;
}
}
}
else
{
err = Z_ERRNO;
}
}
/* Final merge (file + central directory) */
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fclose(fpOutCD);
if (err == Z_OK)
{
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fpOutCD = fopen(fileOutTmp, "rb");
if (fpOutCD != NULL)
{
int nRead;
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)
{
err = Z_ERRNO;
break;
}
}
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fclose(fpOutCD);
}
}
/* Close */
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fclose(fpZip);
fclose(fpOut);
/* Wipe temporary file */
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(void) remove(fileOutTmp);
/* Number of recovered entries */
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if (err == Z_OK)
{
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if (nRecovered != NULL)
{
*nRecovered = entries;
}
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if (bytesRecovered != NULL)
{
*bytesRecovered = totalBytes;
}
}
}
else
{
err = Z_STREAM_ERROR;
}
return err;
}