lz4: Start of implementation.

core/compress/common.odin

@@ -56,9 +56,11 @@ Error :: union {
 		as it may involve an I/O error, a Deflate error, etc.
 	*/
 	image.Error,
+	io.Error,
 }
 
 General_Error :: enum {
+	None = 0,
 	File_Not_Found,
 	Cannot_Open_File,
 	File_Too_Short,
@@ -69,7 +71,6 @@ General_Error :: enum {
 	Incompatible_Options,
 	Unimplemented,
 
-
 	/*
 		Memory errors
 	*/
@@ -98,7 +99,28 @@ GZIP_Error :: enum {
 		You can tweak this setting using `-define:COMPRESS_OUTPUT_ALLOCATE_MAX=size_in_bytes`
 	*/
 	Output_Exceeds_COMPRESS_OUTPUT_ALLOCATE_MAX,
+}
 
+LZ4_Error :: enum {
+	Generic,
+	Max_Block_Size_Invalid,
+	Block_Mode_Invalid,
+	Content_Checksum_Invalid,
+	Compression_Level_Invalid,
+	Header_Version_Wrong,
+	Block_Checksum_Invalid,
+	Reserved_Flag_Set,
+	Allocation_Failed,
+	Source_Size_Too_Large,
+	Output_Buffer_Too_Small,
+	Frame_Header_Incomplete,
+	Frame_Type_Unknown,
+	Frame_Type_Wrong,
+	Frame_Size_Wrong,
+	Source_Input_Wrong,
+	Decompression_Failed,
+	Header_Checksum_Invalid,
+	Frame_Decoding_Already_Started,
 }
 
 ZIP_Error :: enum {
@@ -125,7 +147,6 @@ Deflate_Error :: enum {
 	BType_3,
 }
 
-
 // General I/O context for ZLIB, LZW, etc.
 Context_Memory_Input :: struct #packed {
 	input_data:        []u8,