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Here goes my code
This method reads the local header
ZIPFILE * readZipData(FILE *fp)
{
struct ZIPFILE * pZip = NULL;
int tempData;
short int tempShortInt;
struct ZipHeader *header = NULL;
fseek(fp,-4,SEEK_CUR);
int *filePos = (int*) malloc(sizeof(int));
*filePos = ftell(fp);
header = (struct ZipHeader*)malloc(sizeof(struct ZipHeader));
fread(&tempData,sizeof(int),1,fp);
header.localHeader = tempData;
fread(&tempShortInt,sizeof(short int),1,fp);
header-version = tempShortInt;
fread(&tempShortInt,sizeof(short int),1,fp);
header-genPurposeFlag = tempShortInt;
fread(&tempShortInt,sizeof(short int),1,fp);
header-compressionMethod = tempShortInt;
fread(&tempShortInt,sizeof(short int),1,fp);
header-lastModFileTime = tempShortInt;
fread(&tempShortInt,sizeof(short int),1,fp);
header-lastModFileDate = tempShortInt;
fread(&tempData,sizeof(int),1,fp);
header-crc = tempData;
fread(&tempData,sizeof(int),1,fp);
header-compressedSize = tempData;
fread(&tempData,sizeof(int),1,fp);
header-uncompressedSize = tempData;
fread(&tempShortInt,sizeof(short int),1,fp);
header-fileNameLength = tempShortInt;
fread(&tempShortInt,sizeof(short int),1,fp);
header-extraFieldLength = tempShortInt;
pZip = (struct ZIPFILE*) malloc(sizeof(struct ZIPFILE));
pZip-FileName = readFileName(header-fileNameLength,fp);
pZip-Position = *filePos;
pZip-Header = header;
pZip-CompressRatio = (1-((float)header-compressedSize/(float)header-uncompressedSize)) * 100;
pZip-FileData = readFileData(fp,header-compressedSize,header-extraFieldLength);
if(header-genPurposeFlag & 0x4)
fseek(fp,12,SEEK_CUR);
return pZip;
}
This reads the compressed file data
BYTE * readFileData(FILE *fp, int fileLength, int bytesToSkip)
{
BYTE * fileData = NULL;
if(bytesToSkip 0)
fseek(fp,bytesToSkip,SEEK_CUR);
fileData = (BYTE *) calloc(fileLength,1);
int index = 0;
while(index != fileLength)
{
fileData[index++] = fgetc(fp);
}
// fread((BYTE*)fileData,fileLength,1,fp);
return fileData;
}
I also read the centrla directory
then when I try to call uncompress using
unsigned long actualLen = pData-Header-uncompressedSize;
BYTE *pActualData = NULL;
pActualData = (BYTE*)malloc(pData-Header-uncompressedSize);
pByteData points to the contents of compressed file
int i = uncompress(pActualData,&actualLen,pByteData,compressedSize);
When this is executed it returns -3 from inflate method basically it returns from this code inside
+inflate method
if (
#endif
((BITS(8) << 8) + (hold 8)) % 31) {
strm-msg = (char *)"incorrect header check"; -----------------
+-------------
state-mode = BAD;
break;
I hope this will give enough information whats goin wroing....Please let me know what i'm doing wro
+ng
NOTE:: SYNTAX may be wrong as the editor didn't allowed pointer indirection character
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