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/*****************************************************************************/
/* CascDecompress.cpp Copyright (c) Ladislav Zezula 2014 */
/*---------------------------------------------------------------------------*/
/* Decompression functions */
/*---------------------------------------------------------------------------*/
/* Date Ver Who Comment */
/* -------- ---- --- ------- */
/* 02.05.14 1.00 Lad The first version of CascDecompress.cpp */
/*****************************************************************************/
#define __CASCLIB_SELF__
#include "CascLib.h"
#include "CascCommon.h"
//-----------------------------------------------------------------------------
// Public functions
int CascDecompress(LPBYTE pbOutBuffer, PDWORD pcbOutBuffer, LPBYTE pbInBuffer, DWORD cbInBuffer)
{
z_stream z; // Stream information for zlib
uInt cbOutBuffer = *pcbOutBuffer;
int nResult;
int nError = ERROR_FILE_CORRUPT;
// Fill the stream structure for zlib
z.next_in = pbInBuffer;
z.avail_in = cbInBuffer;
z.total_in = cbInBuffer;
z.next_out = pbOutBuffer;
z.avail_out = cbOutBuffer;
z.total_out = 0;
z.zalloc = NULL;
z.zfree = NULL;
// Reset the total number of output bytes
cbOutBuffer = 0;
// Initialize the decompression structure
if((nResult = inflateInit(&z)) == Z_OK)
{
// Call zlib to decompress the data
nResult = inflate(&z, Z_NO_FLUSH);
if (nResult == Z_OK || nResult == Z_STREAM_END)
{
// Give the size of the uncompressed data
cbOutBuffer = z.total_out;
nError = ERROR_SUCCESS;
}
inflateEnd(&z);
}
// Give the caller the number of bytes needed
pcbOutBuffer[0] = cbOutBuffer;
return nError;
}
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