/**

 * FreeRDP: A Remote Desktop Protocol Implementation

 * Bulk Compression

 *

 * Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "bulk.h"

#define TAG "com.freerdp.core"

//#define WITH_BULK_DEBUG		1

static INLINE const char* bulk_get_compression_flags_string(UINT32 flags)

{

	flags &= BULK_COMPRESSION_FLAGS_MASK;

	if (flags == 0)

		return "PACKET_UNCOMPRESSED";

	else if (flags == PACKET_COMPRESSED)

		return "PACKET_COMPRESSED";

	else if (flags == PACKET_AT_FRONT)

		return "PACKET_AT_FRONT";

	else if (flags == PACKET_FLUSHED)

		return "PACKET_FLUSHED";

	else if (flags == (PACKET_COMPRESSED | PACKET_AT_FRONT))

		return "PACKET_COMPRESSED | PACKET_AT_FRONT";

	else if (flags == (PACKET_COMPRESSED | PACKET_FLUSHED))

		return "PACKET_COMPRESSED | PACKET_FLUSHED";

	else if (flags == (PACKET_AT_FRONT | PACKET_FLUSHED))

		return "PACKET_AT_FRONT | PACKET_FLUSHED";

	else if (flags == (PACKET_COMPRESSED | PACKET_AT_FRONT | PACKET_FLUSHED))

		return "PACKET_COMPRESSED | PACKET_AT_FRONT | PACKET_FLUSHED";

	return "PACKET_UNKNOWN";

}

UINT32 bulk_compression_level(rdpBulk* bulk)

{

	rdpSettings* settings = bulk->context->settings;

	bulk->CompressionLevel = (settings->CompressionLevel >= PACKET_COMPR_TYPE_RDP61) ?

	                         PACKET_COMPR_TYPE_RDP61 : settings->CompressionLevel;

	return bulk->CompressionLevel;

}

UINT32 bulk_compression_max_size(rdpBulk* bulk)

{

	bulk_compression_level(bulk);

	bulk->CompressionMaxSize = (bulk->CompressionLevel < PACKET_COMPR_TYPE_64K) ? 8192 : 65536;

	return bulk->CompressionMaxSize;

}

static INLINE  int bulk_compress_validate(rdpBulk* bulk, BYTE* pSrcData, UINT32 SrcSize,

        BYTE** ppDstData, UINT32* pDstSize, UINT32* pFlags)

{

	int status;

	BYTE* _pSrcData = NULL;

	BYTE* _pDstData = NULL;

	UINT32 _SrcSize = 0;

	UINT32 _DstSize = 0;

	UINT32 _Flags = 0;

	_pSrcData = *ppDstData;

	_SrcSize = *pDstSize;

	_Flags = *pFlags | bulk->CompressionLevel;

	status = bulk_decompress(bulk, _pSrcData, _SrcSize, &_pDstData, &_DstSize, _Flags);

	if (status < 0)

	{

		WLog_DBG(TAG, "compression/decompression failure");

		return status;

	}

	if (_DstSize != SrcSize)

	{

		WLog_DBG(TAG, "compression/decompression size mismatch: Actual: %"PRIu32", Expected: %"PRIu32"",

		         _DstSize, SrcSize);

		return -1;

	}

	if (memcmp(_pDstData, pSrcData, SrcSize) != 0)

	{

		WLog_DBG(TAG, "compression/decompression input/output mismatch! flags: 0x%08"PRIX32"", _Flags);

#if 1

		WLog_DBG(TAG, "Actual:");

		winpr_HexDump(TAG, WLOG_DEBUG, _pDstData, SrcSize);

		WLog_DBG(TAG, "Expected:");

		winpr_HexDump(TAG, WLOG_DEBUG, pSrcData, SrcSize);

#endif

		return -1;

	}

	return status;

}

int bulk_decompress(rdpBulk* bulk, BYTE* pSrcData, UINT32 SrcSize, BYTE** ppDstData,

                    UINT32* pDstSize, UINT32 flags)

{

	UINT32 type;

	int status = -1;

	rdpMetrics* metrics;

	UINT32 CompressedBytes;

	UINT32 UncompressedBytes;

	double CompressionRatio;

	metrics = bulk->context->metrics;

	bulk_compression_max_size(bulk);

	type = flags & BULK_COMPRESSION_TYPE_MASK;

	if (flags & BULK_COMPRESSION_FLAGS_MASK)

	{

		switch (type)

		{

			case PACKET_COMPR_TYPE_8K:

				mppc_set_compression_level(bulk->mppcRecv, 0);

				status = mppc_decompress(bulk->mppcRecv, pSrcData, SrcSize, ppDstData, pDstSize, flags);

				break;

			case PACKET_COMPR_TYPE_64K:

				mppc_set_compression_level(bulk->mppcRecv, 1);

				status = mppc_decompress(bulk->mppcRecv, pSrcData, SrcSize, ppDstData, pDstSize, flags);

				break;

			case PACKET_COMPR_TYPE_RDP6:

				status = ncrush_decompress(bulk->ncrushRecv, pSrcData, SrcSize, ppDstData, pDstSize, flags);

				break;

			case PACKET_COMPR_TYPE_RDP61:

				status = xcrush_decompress(bulk->xcrushRecv, pSrcData, SrcSize, ppDstData, pDstSize, flags);

				break;

			case PACKET_COMPR_TYPE_RDP8:

				status = -1;

				break;

		}

	}

	else

	{

		*ppDstData = pSrcData;

		*pDstSize = SrcSize;

		status = 0;

	}

	if (status >= 0)

	{

		CompressedBytes = SrcSize;

		UncompressedBytes = *pDstSize;

		CompressionRatio = metrics_write_bytes(metrics, UncompressedBytes, CompressedBytes);

#ifdef WITH_BULK_DEBUG

		{

			WLog_DBG(TAG,

			         "Decompress Type: %"PRIu32" Flags: %s (0x%08"PRIX32") Compression Ratio: %f (%"PRIu32" / %"PRIu32"), Total: %f (%"PRIu64" / %"PRIu64")",

			         type, bulk_get_compression_flags_string(flags), flags,

			         CompressionRatio, CompressedBytes, UncompressedBytes,

			         metrics->TotalCompressionRatio, metrics->TotalCompressedBytes,

			         metrics->TotalUncompressedBytes);

		}

#endif

	}

	else

	{

		WLog_ERR(TAG, "Decompression failure!");

	}

	return status;

}

int bulk_compress(rdpBulk* bulk, BYTE* pSrcData, UINT32 SrcSize, BYTE** ppDstData, UINT32* pDstSize,

                  UINT32* pFlags)

{

	int status = -1;

	rdpMetrics* metrics;

	UINT32 CompressedBytes;

	UINT32 UncompressedBytes;

	double CompressionRatio;

	metrics = bulk->context->metrics;

	if ((SrcSize <= 50) || (SrcSize >= 16384))

	{

		*ppDstData = pSrcData;

		*pDstSize = SrcSize;

		return 0;

	}

	*ppDstData = bulk->OutputBuffer;

	*pDstSize = sizeof(bulk->OutputBuffer);

	bulk_compression_level(bulk);

	bulk_compression_max_size(bulk);

	if ((bulk->CompressionLevel == PACKET_COMPR_TYPE_8K) ||

	    (bulk->CompressionLevel == PACKET_COMPR_TYPE_64K))

	{

		mppc_set_compression_level(bulk->mppcSend, bulk->CompressionLevel);

		status = mppc_compress(bulk->mppcSend, pSrcData, SrcSize, ppDstData, pDstSize, pFlags);

	}

	else if (bulk->CompressionLevel == PACKET_COMPR_TYPE_RDP6)

	{

		status = ncrush_compress(bulk->ncrushSend, pSrcData, SrcSize, ppDstData, pDstSize, pFlags);

	}

	else if (bulk->CompressionLevel == PACKET_COMPR_TYPE_RDP61)

	{

		status = xcrush_compress(bulk->xcrushSend, pSrcData, SrcSize, ppDstData, pDstSize, pFlags);

	}

	else

	{

		status = -1;

	}

	if (status >= 0)

	{

		CompressedBytes = *pDstSize;

		UncompressedBytes = SrcSize;

		CompressionRatio = metrics_write_bytes(metrics, UncompressedBytes, CompressedBytes);

#ifdef WITH_BULK_DEBUG

		{

			WLog_DBG(TAG,

			         "Compress Type: %"PRIu32" Flags: %s (0x%08"PRIX32") Compression Ratio: %f (%"PRIu32" / %"PRIu32"), Total: %f (%"PRIu64" / %"PRIu64")",

			         bulk->CompressionLevel, bulk_get_compression_flags_string(*pFlags), *pFlags,

			         CompressionRatio, CompressedBytes, UncompressedBytes,

			         metrics->TotalCompressionRatio, metrics->TotalCompressedBytes,

			         metrics->TotalUncompressedBytes);

		}

#endif

	}

#if 0

	if (bulk_compress_validate(bulk, pSrcData, SrcSize, ppDstData, pDstSize, pFlags) < 0)

		status = -1;

#endif

	return status;

}

void bulk_reset(rdpBulk* bulk)

{

	mppc_context_reset(bulk->mppcSend, FALSE);

	mppc_context_reset(bulk->mppcRecv, FALSE);

	ncrush_context_reset(bulk->ncrushRecv, FALSE);

	ncrush_context_reset(bulk->ncrushSend, FALSE);

	xcrush_context_reset(bulk->xcrushRecv, FALSE);

	xcrush_context_reset(bulk->xcrushSend, FALSE);

}

rdpBulk* bulk_new(rdpContext* context)

{

	rdpBulk* bulk;

	bulk = (rdpBulk*) calloc(1, sizeof(rdpBulk));

	if (bulk)

	{

		bulk->context = context;

		bulk->mppcSend = mppc_context_new(1, TRUE);

		bulk->mppcRecv = mppc_context_new(1, FALSE);

		bulk->ncrushRecv = ncrush_context_new(FALSE);

		bulk->ncrushSend = ncrush_context_new(TRUE);

		bulk->xcrushRecv = xcrush_context_new(FALSE);

		bulk->xcrushSend = xcrush_context_new(TRUE);

		bulk->CompressionLevel = context->settings->CompressionLevel;

	}

	return bulk;

}

void bulk_free(rdpBulk* bulk)

{

	if (!bulk)

		return;

	mppc_context_free(bulk->mppcSend);

	mppc_context_free(bulk->mppcRecv);

	ncrush_context_free(bulk->ncrushRecv);

	ncrush_context_free(bulk->ncrushSend);

	xcrush_context_free(bulk->xcrushRecv);

	xcrush_context_free(bulk->xcrushSend);

	free(bulk);

}