/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * ClearCodec Bitmap Compression
 *
 * Copyright 2014 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 * Copyright 2016 Armin Novak <armin.novak@thincast.com>
 * Copyright 2016 Thincast Technologies GmbH
 *
 * 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.
 */

#include <freerdp/config.h>

#include <winpr/crt.h>
#include <winpr/print.h>
#include <winpr/bitstream.h>

#include <freerdp/codec/color.h>
#include <freerdp/codec/clear.h>
#include <freerdp/log.h>

#define TAG FREERDP_TAG("codec.clear")

#define CLEARCODEC_FLAG_GLYPH_INDEX 0x01
#define CLEARCODEC_FLAG_GLYPH_HIT 0x02
#define CLEARCODEC_FLAG_CACHE_RESET 0x04

#define CLEARCODEC_VBAR_SIZE 32768
#define CLEARCODEC_VBAR_SHORT_SIZE 16384

typedef struct
{
	UINT32 size;
	UINT32 count;
	UINT32* pixels;
} CLEAR_GLYPH_ENTRY;

typedef struct
{
	UINT32 size;
	UINT32 count;
	BYTE* pixels;
} CLEAR_VBAR_ENTRY;

struct S_CLEAR_CONTEXT
{
	BOOL Compressor;
	NSC_CONTEXT* nsc;
	UINT32 seqNumber;
	BYTE* TempBuffer;
	UINT32 TempSize;
	UINT32 nTempStep;
	UINT32 TempFormat;
	UINT32 format;
	CLEAR_GLYPH_ENTRY GlyphCache[4000];
	UINT32 VBarStorageCursor;
	CLEAR_VBAR_ENTRY VBarStorage[CLEARCODEC_VBAR_SIZE];
	UINT32 ShortVBarStorageCursor;
	CLEAR_VBAR_ENTRY ShortVBarStorage[CLEARCODEC_VBAR_SHORT_SIZE];
};

static const UINT32 CLEAR_LOG2_FLOOR[256] = {
	0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
	5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
	6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
	6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
	7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
	7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
	7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
	7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7
};

static const BYTE CLEAR_8BIT_MASKS[9] = { 0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF };

static void clear_reset_vbar_storage(CLEAR_CONTEXT* clear, BOOL zero)
{
	if (zero)
	{
		for (size_t i = 0; i < ARRAYSIZE(clear->VBarStorage); i++)
			winpr_aligned_free(clear->VBarStorage[i].pixels);

		ZeroMemory(clear->VBarStorage, sizeof(clear->VBarStorage));
	}

	clear->VBarStorageCursor = 0;

	if (zero)
	{
		for (size_t i = 0; i < ARRAYSIZE(clear->ShortVBarStorage); i++)
			winpr_aligned_free(clear->ShortVBarStorage[i].pixels);

		ZeroMemory(clear->ShortVBarStorage, sizeof(clear->ShortVBarStorage));
	}

	clear->ShortVBarStorageCursor = 0;
}

static void clear_reset_glyph_cache(CLEAR_CONTEXT* clear)
{
	for (size_t i = 0; i < ARRAYSIZE(clear->GlyphCache); i++)
		winpr_aligned_free(clear->GlyphCache[i].pixels);

	ZeroMemory(clear->GlyphCache, sizeof(clear->GlyphCache));
}

static BOOL convert_color(BYTE* dst, UINT32 nDstStep, UINT32 DstFormat, UINT32 nXDst, UINT32 nYDst,
                          UINT32 nWidth, UINT32 nHeight, const BYTE* src, UINT32 nSrcStep,
                          UINT32 SrcFormat, UINT32 nDstWidth, UINT32 nDstHeight,
                          const gdiPalette* palette)
{
	if (nWidth + nXDst > nDstWidth)
		nWidth = nDstWidth - nXDst;

	if (nHeight + nYDst > nDstHeight)
		nHeight = nDstHeight - nYDst;

	return freerdp_image_copy(dst, DstFormat, nDstStep, nXDst, nYDst, nWidth, nHeight, src,
	                          SrcFormat, nSrcStep, 0, 0, palette, FREERDP_KEEP_DST_ALPHA);
}

static BOOL clear_decompress_nscodec(NSC_CONTEXT* nsc, UINT32 width, UINT32 height, wStream* s,
                                     UINT32 bitmapDataByteCount, BYTE* pDstData, UINT32 DstFormat,
                                     UINT32 nDstStep, UINT32 nXDstRel, UINT32 nYDstRel)
{
	BOOL rc = 0;

	if (!Stream_CheckAndLogRequiredLength(TAG, s, bitmapDataByteCount))
		return FALSE;

	rc = nsc_process_message(nsc, 32, width, height, Stream_Pointer(s), bitmapDataByteCount,
	                         pDstData, DstFormat, nDstStep, nXDstRel, nYDstRel, width, height,
	                         FREERDP_FLIP_NONE);
	Stream_Seek(s, bitmapDataByteCount);
	return rc;
}

static BOOL clear_decompress_subcode_rlex(wStream* s, UINT32 bitmapDataByteCount, UINT32 width,
                                          UINT32 height, BYTE* pDstData, UINT32 DstFormat,
                                          UINT32 nDstStep, UINT32 nXDstRel, UINT32 nYDstRel,
                                          UINT32 nDstWidth, UINT32 nDstHeight)
{
	UINT32 x = 0;
	UINT32 y = 0;
	UINT32 pixelCount = 0;
	UINT32 bitmapDataOffset = 0;
	size_t pixelIndex = 0;
	UINT32 numBits = 0;
	BYTE startIndex = 0;
	BYTE stopIndex = 0;
	BYTE suiteIndex = 0;
	BYTE suiteDepth = 0;
	BYTE paletteCount = 0;
	UINT32 palette[128] = { 0 };

	if (!Stream_CheckAndLogRequiredLength(TAG, s, bitmapDataByteCount))
		return FALSE;

	if (!Stream_CheckAndLogRequiredLength(TAG, s, 1))
		return FALSE;
	Stream_Read_UINT8(s, paletteCount);
	bitmapDataOffset = 1 + (paletteCount * 3);

	if ((paletteCount > 127) || (paletteCount < 1))
	{
		WLog_ERR(TAG, "paletteCount %" PRIu8 "", paletteCount);
		return FALSE;
	}

	if (!Stream_CheckAndLogRequiredLengthOfSize(TAG, s, paletteCount, 3ull))
		return FALSE;

	for (UINT32 i = 0; i < paletteCount; i++)
	{
		BYTE r = 0;
		BYTE g = 0;
		BYTE b = 0;
		Stream_Read_UINT8(s, b);
		Stream_Read_UINT8(s, g);
		Stream_Read_UINT8(s, r);
		palette[i] = FreeRDPGetColor(DstFormat, r, g, b, 0xFF);
	}

	pixelIndex = 0;
	pixelCount = width * height;
	numBits = CLEAR_LOG2_FLOOR[paletteCount - 1] + 1;

	while (bitmapDataOffset < bitmapDataByteCount)
	{
		UINT32 tmp = 0;
		UINT32 color = 0;
		UINT32 runLengthFactor = 0;

		if (!Stream_CheckAndLogRequiredLength(TAG, s, 2))
			return FALSE;

		Stream_Read_UINT8(s, tmp);
		Stream_Read_UINT8(s, runLengthFactor);
		bitmapDataOffset += 2;
		suiteDepth = (tmp >> numBits) & CLEAR_8BIT_MASKS[(8 - numBits)];
		stopIndex = tmp & CLEAR_8BIT_MASKS[numBits];
		startIndex = stopIndex - suiteDepth;

		if (runLengthFactor >= 0xFF)
		{
			if (!Stream_CheckAndLogRequiredLength(TAG, s, 2))
				return FALSE;

			Stream_Read_UINT16(s, runLengthFactor);
			bitmapDataOffset += 2;

			if (runLengthFactor >= 0xFFFF)
			{
				if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
					return FALSE;

				Stream_Read_UINT32(s, runLengthFactor);
				bitmapDataOffset += 4;
			}
		}

		if (startIndex >= paletteCount)
		{
			WLog_ERR(TAG, "startIndex %" PRIu8 " > paletteCount %" PRIu8 "]", startIndex,
			         paletteCount);
			return FALSE;
		}

		if (stopIndex >= paletteCount)
		{
			WLog_ERR(TAG, "stopIndex %" PRIu8 " > paletteCount %" PRIu8 "]", stopIndex,
			         paletteCount);
			return FALSE;
		}

		suiteIndex = startIndex;

		if (suiteIndex > 127)
		{
			WLog_ERR(TAG, "suiteIndex %" PRIu8 " > 127]", suiteIndex);
			return FALSE;
		}

		color = palette[suiteIndex];

		if ((pixelIndex + runLengthFactor) > pixelCount)
		{
			WLog_ERR(TAG,
			         "pixelIndex %" PRIu32 " + runLengthFactor %" PRIu32 " > pixelCount %" PRIu32
			         "",
			         pixelIndex, runLengthFactor, pixelCount);
			return FALSE;
		}

		for (UINT32 i = 0; i < runLengthFactor; i++)
		{
			BYTE* pTmpData = &pDstData[(nXDstRel + x) * FreeRDPGetBytesPerPixel(DstFormat) +
			                           (nYDstRel + y) * nDstStep];

			if ((nXDstRel + x < nDstWidth) && (nYDstRel + y < nDstHeight))
				FreeRDPWriteColor(pTmpData, DstFormat, color);

			if (++x >= width)
			{
				y++;
				x = 0;
			}
		}

		pixelIndex += runLengthFactor;

		if ((pixelIndex + (suiteDepth + 1)) > pixelCount)
		{
			WLog_ERR(TAG,
			         "pixelIndex %" PRIu32 " + suiteDepth %" PRIu8 " + 1 > pixelCount %" PRIu32 "",
			         pixelIndex, suiteDepth, pixelCount);
			return FALSE;
		}

		for (UINT32 i = 0; i <= suiteDepth; i++)
		{
			BYTE* pTmpData = &pDstData[(nXDstRel + x) * FreeRDPGetBytesPerPixel(DstFormat) +
			                           (nYDstRel + y) * nDstStep];
			UINT32 ccolor = palette[suiteIndex];

			if (suiteIndex > 127)
			{
				WLog_ERR(TAG, "suiteIndex %" PRIu8 " > 127", suiteIndex);
				return FALSE;
			}

			suiteIndex++;

			if ((nXDstRel + x < nDstWidth) && (nYDstRel + y < nDstHeight))
				FreeRDPWriteColor(pTmpData, DstFormat, ccolor);

			if (++x >= width)
			{
				y++;
				x = 0;
			}
		}

		pixelIndex += (suiteDepth + 1);
	}

	if (pixelIndex != pixelCount)
	{
		WLog_ERR(TAG, "pixelIndex %" PRIdz " != pixelCount %" PRIu32 "", pixelIndex, pixelCount);
		return FALSE;
	}

	return TRUE;
}

static BOOL clear_resize_buffer(CLEAR_CONTEXT* clear, UINT32 width, UINT32 height)
{
	UINT32 size = 0;

	if (!clear)
		return FALSE;

	size = ((width + 16) * (height + 16) * FreeRDPGetBytesPerPixel(clear->format));

	if (size > clear->TempSize)
	{
		BYTE* tmp = (BYTE*)winpr_aligned_recalloc(clear->TempBuffer, size, sizeof(BYTE), 32);

		if (!tmp)
		{
			WLog_ERR(TAG, "clear->TempBuffer winpr_aligned_recalloc failed for %" PRIu32 " bytes",
			         size);
			return FALSE;
		}

		clear->TempSize = size;
		clear->TempBuffer = tmp;
	}

	return TRUE;
}

static BOOL clear_decompress_residual_data(CLEAR_CONTEXT* clear, wStream* s,
                                           UINT32 residualByteCount, UINT32 nWidth, UINT32 nHeight,
                                           BYTE* pDstData, UINT32 DstFormat, UINT32 nDstStep,
                                           UINT32 nXDst, UINT32 nYDst, UINT32 nDstWidth,
                                           UINT32 nDstHeight, const gdiPalette* palette)
{
	UINT32 nSrcStep = 0;
	UINT32 suboffset = 0;
	BYTE* dstBuffer = NULL;
	UINT32 pixelIndex = 0;
	UINT32 pixelCount = 0;

	if (!Stream_CheckAndLogRequiredLength(TAG, s, residualByteCount))
		return FALSE;

	suboffset = 0;
	pixelIndex = 0;
	pixelCount = nWidth * nHeight;

	if (!clear_resize_buffer(clear, nWidth, nHeight))
		return FALSE;

	dstBuffer = clear->TempBuffer;

	while (suboffset < residualByteCount)
	{
		BYTE r = 0;
		BYTE g = 0;
		BYTE b = 0;
		UINT32 runLengthFactor = 0;
		UINT32 color = 0;

		if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
			return FALSE;

		Stream_Read_UINT8(s, b);
		Stream_Read_UINT8(s, g);
		Stream_Read_UINT8(s, r);
		Stream_Read_UINT8(s, runLengthFactor);
		suboffset += 4;
		color = FreeRDPGetColor(clear->format, r, g, b, 0xFF);

		if (runLengthFactor >= 0xFF)
		{
			if (!Stream_CheckAndLogRequiredLength(TAG, s, 2))
				return FALSE;

			Stream_Read_UINT16(s, runLengthFactor);
			suboffset += 2;

			if (runLengthFactor >= 0xFFFF)
			{
				if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
					return FALSE;

				Stream_Read_UINT32(s, runLengthFactor);
				suboffset += 4;
			}
		}

		if ((pixelIndex >= pixelCount) || (runLengthFactor > (pixelCount - pixelIndex)))
		{
			WLog_ERR(TAG,
			         "pixelIndex %" PRIu32 " + runLengthFactor %" PRIu32 " > pixelCount %" PRIu32
			         "",
			         pixelIndex, runLengthFactor, pixelCount);
			return FALSE;
		}

		for (UINT32 i = 0; i < runLengthFactor; i++)
		{
			FreeRDPWriteColor(dstBuffer, clear->format, color);
			dstBuffer += FreeRDPGetBytesPerPixel(clear->format);
		}

		pixelIndex += runLengthFactor;
	}

	nSrcStep = nWidth * FreeRDPGetBytesPerPixel(clear->format);

	if (pixelIndex != pixelCount)
	{
		WLog_ERR(TAG, "pixelIndex %" PRIu32 " != pixelCount %" PRIu32 "", pixelIndex, pixelCount);
		return FALSE;
	}

	return convert_color(pDstData, nDstStep, DstFormat, nXDst, nYDst, nWidth, nHeight,
	                     clear->TempBuffer, nSrcStep, clear->format, nDstWidth, nDstHeight,
	                     palette);
}

static BOOL clear_decompress_subcodecs_data(CLEAR_CONTEXT* clear, wStream* s,
                                            UINT32 subcodecByteCount, UINT32 nWidth, UINT32 nHeight,
                                            BYTE* pDstData, UINT32 DstFormat, UINT32 nDstStep,
                                            UINT32 nXDst, UINT32 nYDst, UINT32 nDstWidth,
                                            UINT32 nDstHeight, const gdiPalette* palette)
{
	UINT16 xStart = 0;
	UINT16 yStart = 0;
	UINT16 width = 0;
	UINT16 height = 0;
	UINT32 bitmapDataByteCount = 0;
	BYTE subcodecId = 0;
	UINT32 suboffset = 0;

	if (!Stream_CheckAndLogRequiredLength(TAG, s, subcodecByteCount))
		return FALSE;

	suboffset = 0;

	while (suboffset < subcodecByteCount)
	{
		UINT32 nXDstRel = 0;
		UINT32 nYDstRel = 0;

		if (!Stream_CheckAndLogRequiredLength(TAG, s, 13))
			return FALSE;

		Stream_Read_UINT16(s, xStart);
		Stream_Read_UINT16(s, yStart);
		Stream_Read_UINT16(s, width);
		Stream_Read_UINT16(s, height);
		Stream_Read_UINT32(s, bitmapDataByteCount);
		Stream_Read_UINT8(s, subcodecId);
		suboffset += 13;

		if (!Stream_CheckAndLogRequiredLength(TAG, s, bitmapDataByteCount))
			return FALSE;

		nXDstRel = nXDst + xStart;
		nYDstRel = nYDst + yStart;

		if (width > nWidth)
		{
			WLog_ERR(TAG, "width %" PRIu16 " > nWidth %" PRIu32 "", width, nWidth);
			return FALSE;
		}

		if (height > nHeight)
		{
			WLog_ERR(TAG, "height %" PRIu16 " > nHeight %" PRIu32 "", height, nHeight);
			return FALSE;
		}

		if (!clear_resize_buffer(clear, width, height))
			return FALSE;

		switch (subcodecId)
		{
			case 0: /* Uncompressed */
			{
				UINT32 nSrcStep = width * FreeRDPGetBytesPerPixel(PIXEL_FORMAT_BGR24);
				UINT32 nSrcSize = nSrcStep * height;

				if (bitmapDataByteCount != nSrcSize)
				{
					WLog_ERR(TAG, "bitmapDataByteCount %" PRIu32 " != nSrcSize %" PRIu32 "",
					         bitmapDataByteCount, nSrcSize);
					return FALSE;
				}

				if (!convert_color(pDstData, nDstStep, DstFormat, nXDstRel, nYDstRel, width, height,
				                   Stream_Pointer(s), nSrcStep, PIXEL_FORMAT_BGR24, nDstWidth,
				                   nDstHeight, palette))
					return FALSE;

				Stream_Seek(s, bitmapDataByteCount);
			}
			break;

			case 1: /* NSCodec */
				if (!clear_decompress_nscodec(clear->nsc, width, height, s, bitmapDataByteCount,
				                              pDstData, DstFormat, nDstStep, nXDstRel, nYDstRel))
					return FALSE;

				break;

			case 2: /* CLEARCODEC_SUBCODEC_RLEX */
				if (!clear_decompress_subcode_rlex(s, bitmapDataByteCount, width, height, pDstData,
				                                   DstFormat, nDstStep, nXDstRel, nYDstRel,
				                                   nDstWidth, nDstHeight))
					return FALSE;

				break;

			default:
				WLog_ERR(TAG, "Unknown subcodec ID %" PRIu8 "", subcodecId);
				return FALSE;
		}

		suboffset += bitmapDataByteCount;
	}

	return TRUE;
}

static BOOL resize_vbar_entry(CLEAR_CONTEXT* clear, CLEAR_VBAR_ENTRY* vBarEntry)
{
	if (vBarEntry->count > vBarEntry->size)
	{
		const UINT32 bpp = FreeRDPGetBytesPerPixel(clear->format);
		const UINT32 oldPos = vBarEntry->size * bpp;
		const UINT32 diffSize = (vBarEntry->count - vBarEntry->size) * bpp;

		vBarEntry->size = vBarEntry->count;
		BYTE* tmp =
		    (BYTE*)winpr_aligned_recalloc(vBarEntry->pixels, vBarEntry->count, 1ull * bpp, 32);

		if (!tmp)
		{
			WLog_ERR(TAG, "vBarEntry->pixels winpr_aligned_recalloc %" PRIu32 " failed",
			         vBarEntry->count * bpp);
			return FALSE;
		}

		memset(&tmp[oldPos], 0, diffSize);
		vBarEntry->pixels = tmp;
	}

	if (!vBarEntry->pixels && vBarEntry->size)
	{
		WLog_ERR(TAG, "vBarEntry->pixels is NULL but vBarEntry->size is %" PRIu32 "",
		         vBarEntry->size);
		return FALSE;
	}

	return TRUE;
}

static BOOL clear_decompress_bands_data(CLEAR_CONTEXT* clear, wStream* s, UINT32 bandsByteCount,
                                        UINT32 nWidth, UINT32 nHeight, BYTE* pDstData,
                                        UINT32 DstFormat, UINT32 nDstStep, UINT32 nXDst,
                                        UINT32 nYDst, UINT32 nDstWidth, UINT32 nDstHeight)
{
	UINT32 suboffset = 0;

	if (!Stream_CheckAndLogRequiredLength(TAG, s, bandsByteCount))
		return FALSE;

	while (suboffset < bandsByteCount)
	{
		BYTE cr = 0;
		BYTE cg = 0;
		BYTE cb = 0;
		UINT16 xStart = 0;
		UINT16 xEnd = 0;
		UINT16 yStart = 0;
		UINT16 yEnd = 0;
		UINT32 colorBkg = 0;
		UINT16 vBarHeader = 0;
		UINT16 vBarYOn = 0;
		UINT16 vBarYOff = 0;
		UINT32 vBarCount = 0;
		UINT32 vBarPixelCount = 0;
		UINT32 vBarShortPixelCount = 0;

		if (!Stream_CheckAndLogRequiredLength(TAG, s, 11))
			return FALSE;

		Stream_Read_UINT16(s, xStart);
		Stream_Read_UINT16(s, xEnd);
		Stream_Read_UINT16(s, yStart);
		Stream_Read_UINT16(s, yEnd);
		Stream_Read_UINT8(s, cb);
		Stream_Read_UINT8(s, cg);
		Stream_Read_UINT8(s, cr);
		suboffset += 11;
		colorBkg = FreeRDPGetColor(clear->format, cr, cg, cb, 0xFF);

		if (xEnd < xStart)
		{
			WLog_ERR(TAG, "xEnd %" PRIu16 " < xStart %" PRIu16 "", xEnd, xStart);
			return FALSE;
		}

		if (yEnd < yStart)
		{
			WLog_ERR(TAG, "yEnd %" PRIu16 " < yStart %" PRIu16 "", yEnd, yStart);
			return FALSE;
		}

		vBarCount = (xEnd - xStart) + 1;

		for (UINT32 i = 0; i < vBarCount; i++)
		{
			UINT32 vBarHeight = 0;
			CLEAR_VBAR_ENTRY* vBarEntry = NULL;
			CLEAR_VBAR_ENTRY* vBarShortEntry = NULL;
			BOOL vBarUpdate = FALSE;
			const BYTE* cpSrcPixel = NULL;

			if (!Stream_CheckAndLogRequiredLength(TAG, s, 2))
				return FALSE;

			Stream_Read_UINT16(s, vBarHeader);
			suboffset += 2;
			vBarHeight = (yEnd - yStart + 1);

			if (vBarHeight > 52)
			{
				WLog_ERR(TAG, "vBarHeight (%" PRIu32 ") > 52", vBarHeight);
				return FALSE;
			}

			if ((vBarHeader & 0xC000) == 0x4000) /* SHORT_VBAR_CACHE_HIT */
			{
				const UINT16 vBarIndex = (vBarHeader & 0x3FFF);
				vBarShortEntry = &(clear->ShortVBarStorage[vBarIndex]);

				if (!vBarShortEntry)
				{
					WLog_ERR(TAG, "missing vBarShortEntry %" PRIu16 "", vBarIndex);
					return FALSE;
				}

				if (!Stream_CheckAndLogRequiredLength(TAG, s, 1))
					return FALSE;

				Stream_Read_UINT8(s, vBarYOn);
				suboffset += 1;
				vBarShortPixelCount = vBarShortEntry->count;
				vBarUpdate = TRUE;
			}
			else if ((vBarHeader & 0xC000) == 0x0000) /* SHORT_VBAR_CACHE_MISS */
			{
				vBarYOn = (vBarHeader & 0xFF);
				vBarYOff = ((vBarHeader >> 8) & 0x3F);

				if (vBarYOff < vBarYOn)
				{
					WLog_ERR(TAG, "vBarYOff %" PRIu16 " < vBarYOn %" PRIu16 "", vBarYOff, vBarYOn);
					return FALSE;
				}

				vBarShortPixelCount = (vBarYOff - vBarYOn);

				if (vBarShortPixelCount > 52)
				{
					WLog_ERR(TAG, "vBarShortPixelCount %" PRIu32 " > 52", vBarShortPixelCount);
					return FALSE;
				}

				if (!Stream_CheckAndLogRequiredLengthOfSize(TAG, s, vBarShortPixelCount, 3ull))
					return FALSE;

				if (clear->ShortVBarStorageCursor >= CLEARCODEC_VBAR_SHORT_SIZE)
				{
					WLog_ERR(TAG,
					         "clear->ShortVBarStorageCursor %" PRIu32
					         " >= CLEARCODEC_VBAR_SHORT_SIZE (%" PRIu32 ")",
					         clear->ShortVBarStorageCursor, CLEARCODEC_VBAR_SHORT_SIZE);
					return FALSE;
				}

				vBarShortEntry = &(clear->ShortVBarStorage[clear->ShortVBarStorageCursor]);
				vBarShortEntry->count = vBarShortPixelCount;

				if (!resize_vbar_entry(clear, vBarShortEntry))
					return FALSE;

				for (UINT32 y = 0; y < vBarShortPixelCount; y++)
				{
					BYTE r = 0;
					BYTE g = 0;
					BYTE b = 0;
					BYTE* dstBuffer =
					    &vBarShortEntry->pixels[y * FreeRDPGetBytesPerPixel(clear->format)];
					UINT32 color = 0;
					Stream_Read_UINT8(s, b);
					Stream_Read_UINT8(s, g);
					Stream_Read_UINT8(s, r);
					color = FreeRDPGetColor(clear->format, r, g, b, 0xFF);

					if (!FreeRDPWriteColor(dstBuffer, clear->format, color))
						return FALSE;
				}

				suboffset += (vBarShortPixelCount * 3);
				clear->ShortVBarStorageCursor =
				    (clear->ShortVBarStorageCursor + 1) % CLEARCODEC_VBAR_SHORT_SIZE;
				vBarUpdate = TRUE;
			}
			else if ((vBarHeader & 0x8000) == 0x8000) /* VBAR_CACHE_HIT */
			{
				const UINT16 vBarIndex = (vBarHeader & 0x7FFF);
				vBarEntry = &(clear->VBarStorage[vBarIndex]);

				/* If the cache was reset we need to fill in some dummy data. */
				if (vBarEntry->size == 0)
				{
					WLog_WARN(TAG, "Empty cache index %" PRIu16 ", filling dummy data", vBarIndex);
					vBarEntry->count = vBarHeight;

					if (!resize_vbar_entry(clear, vBarEntry))
						return FALSE;
				}
			}
			else
			{
				WLog_ERR(TAG, "invalid vBarHeader 0x%04" PRIX16 "", vBarHeader);
				return FALSE; /* invalid vBarHeader */
			}

			if (vBarUpdate)
			{
				BYTE* pSrcPixel = NULL;
				BYTE* dstBuffer = NULL;

				if (clear->VBarStorageCursor >= CLEARCODEC_VBAR_SIZE)
				{
					WLog_ERR(TAG,
					         "clear->VBarStorageCursor %" PRIu32 " >= CLEARCODEC_VBAR_SIZE %" PRIu32
					         "",
					         clear->VBarStorageCursor, CLEARCODEC_VBAR_SIZE);
					return FALSE;
				}

				vBarEntry = &(clear->VBarStorage[clear->VBarStorageCursor]);
				vBarPixelCount = vBarHeight;
				vBarEntry->count = vBarPixelCount;

				if (!resize_vbar_entry(clear, vBarEntry))
					return FALSE;

				dstBuffer = vBarEntry->pixels;
				/* if (y < vBarYOn), use colorBkg */
				UINT32 y = 0;
				UINT32 count = vBarYOn;

				if ((y + count) > vBarPixelCount)
					count = (vBarPixelCount > y) ? (vBarPixelCount - y) : 0;

				while (count--)
				{
					FreeRDPWriteColor(dstBuffer, clear->format, colorBkg);
					dstBuffer += FreeRDPGetBytesPerPixel(clear->format);
				}

				/*
				 * if ((y >= vBarYOn) && (y < (vBarYOn + vBarShortPixelCount))),
				 * use vBarShortPixels at index (y - shortVBarYOn)
				 */
				y = vBarYOn;
				count = vBarShortPixelCount;

				if ((y + count) > vBarPixelCount)
					count = (vBarPixelCount > y) ? (vBarPixelCount - y) : 0;

				if (count > 0)
					pSrcPixel =
					    &vBarShortEntry
					         ->pixels[(y - vBarYOn) * FreeRDPGetBytesPerPixel(clear->format)];

				for (UINT32 x = 0; x < count; x++)
				{
					UINT32 color = 0;
					color = FreeRDPReadColor(&pSrcPixel[x * FreeRDPGetBytesPerPixel(clear->format)],
					                         clear->format);

					if (!FreeRDPWriteColor(dstBuffer, clear->format, color))
						return FALSE;

					dstBuffer += FreeRDPGetBytesPerPixel(clear->format);
				}

				/* if (y >= (vBarYOn + vBarShortPixelCount)), use colorBkg */
				y = vBarYOn + vBarShortPixelCount;
				count = (vBarPixelCount > y) ? (vBarPixelCount - y) : 0;

				while (count--)
				{
					if (!FreeRDPWriteColor(dstBuffer, clear->format, colorBkg))
						return FALSE;

					dstBuffer += FreeRDPGetBytesPerPixel(clear->format);
				}

				vBarEntry->count = vBarPixelCount;
				clear->VBarStorageCursor = (clear->VBarStorageCursor + 1) % CLEARCODEC_VBAR_SIZE;
			}

			if (vBarEntry->count != vBarHeight)
			{
				WLog_ERR(TAG, "vBarEntry->count %" PRIu32 " != vBarHeight %" PRIu32 "",
				         vBarEntry->count, vBarHeight);
				vBarEntry->count = vBarHeight;

				if (!resize_vbar_entry(clear, vBarEntry))
					return FALSE;
			}

			const UINT32 nXDstRel = nXDst + xStart;
			const UINT32 nYDstRel = nYDst + yStart;
			cpSrcPixel = vBarEntry->pixels;

			if (i < nWidth)
			{
				UINT32 count = vBarEntry->count;

				if (count > nHeight)
					count = nHeight;

				if (nXDstRel + i > nDstWidth)
					return FALSE;

				for (UINT32 y = 0; y < count; y++)
				{
					if (nYDstRel + y > nDstHeight)
						return FALSE;

					BYTE* pDstPixel8 =
					    &pDstData[((nYDstRel + y) * nDstStep) +
					              ((nXDstRel + i) * FreeRDPGetBytesPerPixel(DstFormat))];
					UINT32 color = FreeRDPReadColor(cpSrcPixel, clear->format);
					color = FreeRDPConvertColor(color, clear->format, DstFormat, NULL);

					if (!FreeRDPWriteColor(pDstPixel8, DstFormat, color))
						return FALSE;

					cpSrcPixel += FreeRDPGetBytesPerPixel(clear->format);
				}
			}
		}
	}

	return TRUE;
}

static BOOL clear_decompress_glyph_data(CLEAR_CONTEXT* clear, wStream* s, UINT32 glyphFlags,
                                        UINT32 nWidth, UINT32 nHeight, BYTE* pDstData,
                                        UINT32 DstFormat, UINT32 nDstStep, UINT32 nXDst,
                                        UINT32 nYDst, UINT32 nDstWidth, UINT32 nDstHeight,
                                        const gdiPalette* palette, BYTE** ppGlyphData)
{
	UINT16 glyphIndex = 0;

	if (ppGlyphData)
		*ppGlyphData = NULL;

	if ((glyphFlags & CLEARCODEC_FLAG_GLYPH_HIT) && !(glyphFlags & CLEARCODEC_FLAG_GLYPH_INDEX))
	{
		WLog_ERR(TAG, "Invalid glyph flags %08" PRIX32 "", glyphFlags);
		return FALSE;
	}

	if ((glyphFlags & CLEARCODEC_FLAG_GLYPH_INDEX) == 0)
		return TRUE;

	if ((nWidth * nHeight) > (1024 * 1024))
	{
		WLog_ERR(TAG, "glyph too large: %" PRIu32 "x%" PRIu32 "", nWidth, nHeight);
		return FALSE;
	}

	if (!Stream_CheckAndLogRequiredLength(TAG, s, 2))
		return FALSE;

	Stream_Read_UINT16(s, glyphIndex);

	if (glyphIndex >= 4000)
	{
		WLog_ERR(TAG, "Invalid glyphIndex %" PRIu16 "", glyphIndex);
		return FALSE;
	}

	if (glyphFlags & CLEARCODEC_FLAG_GLYPH_HIT)
	{
		UINT32 nSrcStep = 0;
		CLEAR_GLYPH_ENTRY* glyphEntry = &(clear->GlyphCache[glyphIndex]);
		BYTE* glyphData = NULL;

		if (!glyphEntry)
		{
			WLog_ERR(TAG, "clear->GlyphCache[%" PRIu16 "]=NULL", glyphIndex);
			return FALSE;
		}

		glyphData = (BYTE*)glyphEntry->pixels;

		if (!glyphData)
		{
			WLog_ERR(TAG, "clear->GlyphCache[%" PRIu16 "]->pixels=NULL", glyphIndex);
			return FALSE;
		}

		if ((nWidth * nHeight) > glyphEntry->count)
		{
			WLog_ERR(TAG,
			         "(nWidth %" PRIu32 " * nHeight %" PRIu32 ") > glyphEntry->count %" PRIu32 "",
			         nWidth, nHeight, glyphEntry->count);
			return FALSE;
		}

		nSrcStep = nWidth * FreeRDPGetBytesPerPixel(clear->format);
		return convert_color(pDstData, nDstStep, DstFormat, nXDst, nYDst, nWidth, nHeight,
		                     glyphData, nSrcStep, clear->format, nDstWidth, nDstHeight, palette);
	}

	if (glyphFlags & CLEARCODEC_FLAG_GLYPH_INDEX)
	{
		const UINT32 bpp = FreeRDPGetBytesPerPixel(clear->format);
		CLEAR_GLYPH_ENTRY* glyphEntry = &(clear->GlyphCache[glyphIndex]);
		glyphEntry->count = nWidth * nHeight;

		if (glyphEntry->count > glyphEntry->size)
		{
			BYTE* tmp =
			    winpr_aligned_recalloc(glyphEntry->pixels, glyphEntry->count, 1ull * bpp, 32);

			if (!tmp)
			{
				WLog_ERR(TAG, "glyphEntry->pixels winpr_aligned_recalloc %" PRIu32 " failed!",
				         glyphEntry->count * bpp);
				return FALSE;
			}

			glyphEntry->size = glyphEntry->count;
			glyphEntry->pixels = (UINT32*)tmp;
		}

		if (!glyphEntry->pixels)
		{
			WLog_ERR(TAG, "glyphEntry->pixels=NULL");
			return FALSE;
		}

		if (ppGlyphData)
			*ppGlyphData = (BYTE*)glyphEntry->pixels;

		return TRUE;
	}

	return TRUE;
}

static INLINE BOOL updateContextFormat(CLEAR_CONTEXT* clear, UINT32 DstFormat)
{
	if (!clear || !clear->nsc)
		return FALSE;

	clear->format = DstFormat;
	return nsc_context_set_parameters(clear->nsc, NSC_COLOR_FORMAT, DstFormat);
}

INT32 clear_decompress(CLEAR_CONTEXT* clear, const BYTE* pSrcData, UINT32 SrcSize, UINT32 nWidth,
                       UINT32 nHeight, BYTE* pDstData, UINT32 DstFormat, UINT32 nDstStep,
                       UINT32 nXDst, UINT32 nYDst, UINT32 nDstWidth, UINT32 nDstHeight,
                       const gdiPalette* palette)
{
	INT32 rc = -1;
	BYTE seqNumber = 0;
	BYTE glyphFlags = 0;
	UINT32 residualByteCount = 0;
	UINT32 bandsByteCount = 0;
	UINT32 subcodecByteCount = 0;
	wStream sbuffer = { 0 };
	wStream* s = NULL;
	BYTE* glyphData = NULL;

	if (!pDstData)
		return -1002;

	if ((nDstWidth == 0) || (nDstHeight == 0))
		return -1022;

	if ((nWidth > 0xFFFF) || (nHeight > 0xFFFF))
		return -1004;

	s = Stream_StaticConstInit(&sbuffer, pSrcData, SrcSize);

	if (!s)
		return -2005;

	if (!Stream_CheckAndLogRequiredLength(TAG, s, 2))
		goto fail;

	if (!updateContextFormat(clear, DstFormat))
		goto fail;

	Stream_Read_UINT8(s, glyphFlags);
	Stream_Read_UINT8(s, seqNumber);

	if (!clear->seqNumber && seqNumber)
		clear->seqNumber = seqNumber;

	if (seqNumber != clear->seqNumber)
	{
		WLog_ERR(TAG, "Sequence number unexpected %" PRIu8 " - %" PRIu32 "", seqNumber,
		         clear->seqNumber);
		WLog_ERR(TAG, "seqNumber %" PRIu8 " != clear->seqNumber %" PRIu32 "", seqNumber,
		         clear->seqNumber);
		goto fail;
	}

	clear->seqNumber = (seqNumber + 1) % 256;

	if (glyphFlags & CLEARCODEC_FLAG_CACHE_RESET)
	{
		clear_reset_vbar_storage(clear, FALSE);
	}

	if (!clear_decompress_glyph_data(clear, s, glyphFlags, nWidth, nHeight, pDstData, DstFormat,
	                                 nDstStep, nXDst, nYDst, nDstWidth, nDstHeight, palette,
	                                 &glyphData))
	{
		WLog_ERR(TAG, "clear_decompress_glyph_data failed!");
		goto fail;
	}

	/* Read composition payload header parameters */
	if (Stream_GetRemainingLength(s) < 12)
	{
		const UINT32 mask = (CLEARCODEC_FLAG_GLYPH_HIT | CLEARCODEC_FLAG_GLYPH_INDEX);

		if ((glyphFlags & mask) == mask)
			goto finish;

		WLog_ERR(TAG,
		         "invalid glyphFlags, missing flags: 0x%02" PRIx8 " & 0x%02" PRIx32
		         " == 0x%02" PRIx32,
		         glyphFlags, mask, glyphFlags & mask);
		goto fail;
	}

	Stream_Read_UINT32(s, residualByteCount);
	Stream_Read_UINT32(s, bandsByteCount);
	Stream_Read_UINT32(s, subcodecByteCount);

	if (residualByteCount > 0)
	{
		if (!clear_decompress_residual_data(clear, s, residualByteCount, nWidth, nHeight, pDstData,
		                                    DstFormat, nDstStep, nXDst, nYDst, nDstWidth,
		                                    nDstHeight, palette))
		{
			WLog_ERR(TAG, "clear_decompress_residual_data failed!");
			goto fail;
		}
	}

	if (bandsByteCount > 0)
	{
		if (!clear_decompress_bands_data(clear, s, bandsByteCount, nWidth, nHeight, pDstData,
		                                 DstFormat, nDstStep, nXDst, nYDst, nDstWidth, nDstHeight))
		{
			WLog_ERR(TAG, "clear_decompress_bands_data failed!");
			goto fail;
		}
	}

	if (subcodecByteCount > 0)
	{
		if (!clear_decompress_subcodecs_data(clear, s, subcodecByteCount, nWidth, nHeight, pDstData,
		                                     DstFormat, nDstStep, nXDst, nYDst, nDstWidth,
		                                     nDstHeight, palette))
		{
			WLog_ERR(TAG, "clear_decompress_subcodecs_data failed!");
			goto fail;
		}
	}

	if (glyphData)
	{
		if (!freerdp_image_copy(glyphData, clear->format, 0, 0, 0, nWidth, nHeight, pDstData,
		                        DstFormat, nDstStep, nXDst, nYDst, palette, FREERDP_KEEP_DST_ALPHA))
			goto fail;
	}

finish:
	rc = 0;
fail:
	return rc;
}

int clear_compress(CLEAR_CONTEXT* clear, const BYTE* pSrcData, UINT32 SrcSize, BYTE** ppDstData,
                   UINT32* pDstSize)
{
	WLog_ERR(TAG, "TODO: not implemented!");
	return 1;
}

BOOL clear_context_reset(CLEAR_CONTEXT* clear)
{
	if (!clear)
		return FALSE;

	/**
	 * The ClearCodec context is not bound to a particular surface,
	 * and its internal caches must NOT be reset on the ResetGraphics PDU.
	 */
	clear->seqNumber = 0;
	return TRUE;
}

CLEAR_CONTEXT* clear_context_new(BOOL Compressor)
{
	CLEAR_CONTEXT* clear = (CLEAR_CONTEXT*)winpr_aligned_calloc(1, sizeof(CLEAR_CONTEXT), 32);

	if (!clear)
		return NULL;

	clear->Compressor = Compressor;
	clear->nsc = nsc_context_new();

	if (!clear->nsc)
		goto error_nsc;

	if (!updateContextFormat(clear, PIXEL_FORMAT_BGRX32))
		goto error_nsc;

	if (!clear_resize_buffer(clear, 512, 512))
		goto error_nsc;

	if (!clear->TempBuffer)
		goto error_nsc;

	if (!clear_context_reset(clear))
		goto error_nsc;

	return clear;
error_nsc:
	clear_context_free(clear);
	return NULL;
}

void clear_context_free(CLEAR_CONTEXT* clear)
{
	if (!clear)
		return;

	nsc_context_free(clear->nsc);
	winpr_aligned_free(clear->TempBuffer);

	clear_reset_vbar_storage(clear, TRUE);
	clear_reset_glyph_cache(clear);

	winpr_aligned_free(clear);
}