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161 lines
3.7 KiB
161 lines
3.7 KiB
/*
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* decapi.c
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*
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* API entry points.
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*/
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#define ALLOC_VARS
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#include "decoder.h"
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#include <stdio.h>
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#include <memory.h>
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#pragma intrinsic(memcpy)
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bool __stdcall LZX_DecodeInit(
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t_decoder_context **dec_context,
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long compression_window_size,
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PFNALLOC pfnma,
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HANDLE hAllocator
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)
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{
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t_decoder_context *context= pfnma( hAllocator, sizeof( t_decoder_context ));
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if ( context == NULL ) {
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return false;
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}
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*dec_context = context;
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context->dec_malloc = pfnma;
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context->dec_mallochandle = hAllocator;
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context->dec_window_size = compression_window_size;
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context->dec_window_mask = context->dec_window_size - 1;
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/*
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* Window size must be a power of 2
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*/
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if (context->dec_window_size & context->dec_window_mask)
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return false;
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if (allocate_decompression_memory(context) == false)
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return false;
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LZX_DecodeNewGroup(context);
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return true;
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}
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void __fastcall LZX_DecodeNewGroup(t_decoder_context *context)
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{
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reset_decoder_trees(context);
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decoder_misc_init(context);
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init_decoder_translation(context);
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context->dec_num_cfdata_frames = 0;
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}
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int __stdcall LZX_Decode(
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t_decoder_context *context,
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long bytes_to_decode,
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byte * compressed_input_buffer,
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long compressed_input_size,
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byte * uncompressed_output_buffer,
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long uncompressed_output_size,
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long * bytes_decoded
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)
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{
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long result;
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context->dec_input_curpos = compressed_input_buffer;
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context->dec_end_input_pos = (compressed_input_buffer + compressed_input_size + 4);
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context->dec_output_buffer = uncompressed_output_buffer;
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init_decoder_input(context);
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result = decode_data(context, bytes_to_decode);
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context->dec_num_cfdata_frames++;
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if (result < 0)
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{
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*bytes_decoded = 0;
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return 1; /* failure */
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}
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else
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{
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*bytes_decoded = result;
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context->dec_position_at_start += result;
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return 0; /* success */
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}
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}
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//
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// Warning, this dictionary is inserted verbatim, and is not E8
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// translated. If the encoder did E8 translation on its preloaded
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// dictionary, this won't work.
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//
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#ifdef TRACING
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ulong TracingOldDataSize;
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#endif
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#define ROUNDUP2( x, n ) ((((ULONG)(x)) + (((ULONG)(n)) - 1 )) & ~(((ULONG)(n)) - 1 ))
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bool __fastcall LZX_DecodeInsertDictionary(
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t_decoder_context * context,
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const byte * data,
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unsigned long data_size
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)
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{
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if (data_size > context->dec_window_size)
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return false;
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#ifdef TRACING
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TracingOldDataSize = context->dec_window_size + ROUNDUP2( data_size, CHUNK_SIZE );
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#endif
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memcpy(
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&context->dec_mem_window[context->dec_window_size - data_size],
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data,
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data_size
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);
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return true;
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}
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#ifdef TRACING
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void
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__stdcall
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TracingMatch(
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ulong BufPos,
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ulong MatchPos,
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ulong WindowSize,
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ulong MatchLength,
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ulong MatchPosSlot
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)
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{
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printf( "MATCH: At %08X, From %08X, Length %5d\n", BufPos + TracingOldDataSize, MatchPos + TracingOldDataSize, MatchLength );
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}
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void
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__stdcall
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TracingLiteral(
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ulong BufPos,
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ulong ch
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)
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{
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printf( "LITER: At %08X, 0x%02X\n", BufPos + TracingOldDataSize, ch );
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}
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#endif /* TRACING */
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