Asset (de)compression

2026-09-05 13:01:52 +00:00 · 2024-05-20 16:10:55 +02:00
parent ffe8954b8d
commit 9e7e7f0d76
4 changed files with 280 additions and 11 deletions
@@ -0,0 +1,184 @@
+using System.Interop;
+using System;
+using static System.Windows;
+
+namespace LZ4;
+
+[CRepr]
+enum LZ4F_ErrorCode : c_size
+{
+	OK_NoError,
+	ERROR_GENERIC,
+	ERROR_maxBlockSize_invalid,
+	ERROR_blockMode_invalid,
+	ERROR_parameter_invalid,
+	ERROR_compressionLevel_invalid,
+	ERROR_headerVersion_wrong,
+	ERROR_blockChecksum_invalid,
+	ERROR_reservedFlag_set,
+	ERROR_allocation_failed,
+	ERROR_srcSize_tooLarge,
+	ERROR_dstMaxSize_tooSmall,
+	ERROR_frameHeader_incomplete,
+	ERROR_frameType_unknown,
+	ERROR_frameSize_wrong,
+	ERROR_srcPtr_wrong,
+	ERROR_decompressionFailed,
+	ERROR_headerChecksum_invalid,
+	ERROR_contentChecksum_invalid,
+	ERROR_frameDecoding_alreadyStarted,
+	ERROR_compressionState_uninitialized,
+	ERROR_parameter_null,
+	ERROR_io_write,
+	ERROR_io_read,
+	ERROR_maxCode
+}
+
+[CRepr]
+enum LZ4F_BlockSizeID : uint32
+{
+	Default=0,
+	Max64KB=4,
+	Max256KB=5,
+	Max1MB=6,
+	Max4MB=7
+}
+
+[CRepr]
+enum LZ4F_BlockMode : uint32
+{
+	Linked = 0,
+	Independent
+}
+
+[CRepr]
+enum LZ4F_ContentChecksum : uint32
+{
+	NoContentChecksum = 0,
+	ContentChecksumEnabled
+}
+
+[CRepr]
+enum LZ4F_BlockChecksum : uint32
+{
+	NoBlockChecksum = 0,
+	BlockChecksumEnabled
+}
+
+[CRepr]
+enum LZ4F_FrameType : uint32
+{
+	Frame = 0,
+	SkippableFrame
+}
+
+[CRepr]
+struct LZ4F_FrameInfo
+{
+	public LZ4F_BlockSizeID BlockSizeID;
+	public LZ4F_BlockMode BlockMode;
+	public LZ4F_ContentChecksum ContentChecksumFlag;
+	public LZ4F_FrameType FrameType;
+	public c_ulonglong ContentSize;
+	public c_uint DictID;
+	public LZ4F_BlockChecksum BlockChecksumFlag;
+
+	public this(LZ4F_BlockSizeID blockSizeID = .Max64KB, LZ4F_BlockMode blockMode = .Linked,
+		LZ4F_ContentChecksum contentChecksumFlag = .NoContentChecksum,
+		LZ4F_FrameType frameType = .Frame, c_ulonglong contentSize = 0, c_uint dictID = 0,
+		LZ4F_BlockChecksum blockChecksumFlag = .NoBlockChecksum)
+	{
+		BlockSizeID = blockSizeID;
+		BlockMode = blockMode;
+		ContentChecksumFlag = contentChecksumFlag;
+		FrameType = frameType;
+		ContentSize = contentSize;
+		DictID = dictID;
+		BlockChecksumFlag = blockChecksumFlag;
+	}
+}
+
+[CRepr]
+struct LZ4F_Preferences
+{
+	public LZ4F_FrameInfo FrameInfo;
+	public c_int CompressionLevel;
+	public IntBool AutoFlush;
+	public IntBool FavorDecSpeed;
+	private c_uint[3] Reserved;
+
+	public this(LZ4F_FrameInfo frameInfo = .(), c_int compressionLevel = 0, bool autoFlush = false,
+		bool favorDecSpeed = false)
+	{
+		FrameInfo = frameInfo;
+		CompressionLevel = compressionLevel;
+		AutoFlush = autoFlush;
+		FavorDecSpeed = favorDecSpeed;
+		Reserved = default;
+	}
+}
+
+struct LZ4F_dctx;
+
+static
+{
+	[LinkName("LZ4F_isError")]
+	public static extern c_int LZ4F_IsError(LZ4F_ErrorCode code);
+
+	[LinkName("LZ4F_getErrorName")]
+	public static extern char8* LZ4F_GetErrorName(LZ4F_ErrorCode code);
+
+	// Simple Compression
+
+	[LinkName("LZ4F_compressFrame")]
+	public static extern c_size LZ4F_CompressFrame(void* dstBuffer, c_size dstCapacity,
+                                void* srcBuffer, c_size srcSize,
+                                LZ4F_Preferences* preferencesPtr = null);
+
+	public static c_size LZ4F_CompressFrame(Span<uint8> dstBuffer,
+                                Span<uint8> srcBuffer,
+                                LZ4F_Preferences* preferencesPtr = null)
+	{
+#unwarn
+		return LZ4F_CompressFrame(dstBuffer.Ptr, (c_size)dstBuffer.Length, srcBuffer.Ptr, (c_size)srcBuffer.Length, preferencesPtr);
+	}
+	
+	[LinkName("LZ4F_compressFrameBound")]
+	public static extern c_size LZ4F_CompressFrameBound(c_size srcSize, LZ4F_Preferences* preferencesPtr = null);
+
+	[LinkName("LZ4F_compressionLevel_max")]
+	public static extern c_int LZ4F_CompressionLevel_Max();
+
+	// Decompression
+	
+	[LinkName("LZ4F_createDecompressionContext")]
+	public static extern LZ4F_ErrorCode LZ4F_CreateDecompressionContext(LZ4F_dctx** dctxPtr, c_uint version);
+
+	public const c_uint LZ4F_VERSION = 100;
+
+	public static LZ4F_ErrorCode LZ4F_CreateDecompressionContext(out LZ4F_dctx* dctxPtr, c_uint version = LZ4F_VERSION)
+	{
+		dctxPtr = ?;
+		return LZ4F_CreateDecompressionContext(&dctxPtr, LZ4F_VERSION);
+	}
+
+	[LinkName("LZ4F_freeDecompressionContext")]
+	public static extern LZ4F_ErrorCode LZ4F_FreeDecompressionContext(LZ4F_dctx* dctx);
+
+	[LinkName("LZ4F_decompress")]
+	public static extern c_size LZ4F_Decompress(LZ4F_dctx* dctx,
+		                void* dstBuffer, c_size* dstSizePtr,
+		          		void* srcBuffer, c_size* srcSizePtr,
+		          		void* dOptPtr);
+
+	public static c_size LZ4F_Decompress(LZ4F_dctx* dctx,
+		                Span<uint8> dstBuffer,
+		          		Span<uint8> srcBuffer, out c_size bytesRead, out c_size bytesWritten,
+		          		void* dOptPtr = null)
+	{
+		bytesRead = (c_size)srcBuffer.Length;
+		bytesWritten = (c_size)dstBuffer.Length;
+
+		return LZ4F_Decompress(dctx, dstBuffer.Ptr, &bytesWritten, srcBuffer.Ptr, &bytesRead, dOptPtr);
+	}
+}