111 lines
2.3 KiB
C
111 lines
2.3 KiB
C
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/*
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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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bool LZX_DecodeInit(
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t_decoder_context * context,
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long compression_window_size,
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PFNALLOC pfnma,
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PFNFREE pfnmf,
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PFNOPEN pfnopen,
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PFNREAD pfnread,
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PFNWRITE pfnwrite,
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PFNCLOSE pfnclose,
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PFNSEEK pfnseek
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)
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{
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context->dec_malloc = pfnma;
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context->dec_free = pfnmf;
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/* used for 16-bit swap file only */
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context->dec_open = pfnopen;
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context->dec_read = pfnread;
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context->dec_write = pfnwrite;
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context->dec_close = pfnclose;
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context->dec_seek = pfnseek;
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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 LZX_DecodeFree(t_decoder_context *context)
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{
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free_decompression_memory(context);
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}
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void 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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#ifdef BIT16
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DComp_Reset(context);
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#endif
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}
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int 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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#ifdef BIT16
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context->dec_output_curpos = uncompressed_output_buffer;
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context->DComp.NumBytes = (unsigned short) uncompressed_output_size;
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#endif
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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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