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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"
//-----------------------------------------------------------------------------
// Local functions
static int Decompress_ZLIB(LPBYTE pbOutBuffer, PDWORD pcbOutBuffer, LPBYTE pbInBuffer, DWORD cbInBuffer)
{
z_stream z; // Stream information for zlib
int nResult;
// 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 = *pcbOutBuffer;
z.total_out = 0;
z.zalloc = NULL;
z.zfree = NULL;
// Initialize the decompression structure
if((nResult = inflateInit(&z)) == Z_OK)
{
// Call zlib to decompress the data
nResult = inflate(&z, Z_NO_FLUSH);
inflateEnd(&z);
// Give the size of the uncompressed data
*pcbOutBuffer = z.total_out;
}
// Return an error code
return (nResult == Z_OK || nResult == Z_STREAM_END) ? ERROR_SUCCESS : ERROR_FILE_CORRUPT;
}
//-----------------------------------------------------------------------------
// Public functions
int CascDecompress(void * pvOutBuffer, PDWORD pcbOutBuffer, void * pvInBuffer, DWORD cbInBuffer)
{
LPBYTE pbOutBuffer = (LPBYTE)pvOutBuffer;
LPBYTE pbInBuffer = (LPBYTE)pvInBuffer;
DWORD cbOutBuffer = *pcbOutBuffer; // Current size of the output buffer
BYTE uCompression; // Decompressions applied to the data
// Verify buffer sizes
if(cbInBuffer <= 1)
return 0;
// Get applied compression types and decrement data length
uCompression = *pbInBuffer++;
cbInBuffer--;
// Perform the decompressions
switch(uCompression)
{
case 'N': // Uncompressed
assert(cbOutBuffer == cbInBuffer);
memcpy(pbOutBuffer, pbInBuffer, cbInBuffer);
*pcbOutBuffer = cbOutBuffer;
return ERROR_SUCCESS;
case 'Z': // ZLIB
return Decompress_ZLIB(pbOutBuffer, pcbOutBuffer, pbInBuffer, cbInBuffer);
}
assert(false);
return ERROR_NOT_SUPPORTED;
}
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