111 lines
2.3 KiB
C
111 lines
2.3 KiB
C
/*
|
|
* decapi.c
|
|
*
|
|
* API entry points.
|
|
*/
|
|
|
|
#define ALLOC_VARS
|
|
#include "decoder.h"
|
|
#include <stdio.h>
|
|
|
|
|
|
bool LZX_DecodeInit(
|
|
t_decoder_context * context,
|
|
long compression_window_size,
|
|
PFNALLOC pfnma,
|
|
PFNFREE pfnmf,
|
|
PFNOPEN pfnopen,
|
|
PFNREAD pfnread,
|
|
PFNWRITE pfnwrite,
|
|
PFNCLOSE pfnclose,
|
|
PFNSEEK pfnseek
|
|
)
|
|
{
|
|
context->dec_malloc = pfnma;
|
|
context->dec_free = pfnmf;
|
|
|
|
/* used for 16-bit swap file only */
|
|
context->dec_open = pfnopen;
|
|
context->dec_read = pfnread;
|
|
context->dec_write = pfnwrite;
|
|
context->dec_close = pfnclose;
|
|
context->dec_seek = pfnseek;
|
|
|
|
context->dec_window_size = compression_window_size;
|
|
context->dec_window_mask = context->dec_window_size - 1;
|
|
|
|
/*
|
|
* Window size must be a power of 2
|
|
*/
|
|
if (context->dec_window_size & context->dec_window_mask)
|
|
return false;
|
|
|
|
if (allocate_decompression_memory(context) == false)
|
|
return false;
|
|
|
|
LZX_DecodeNewGroup(context);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
void LZX_DecodeFree(t_decoder_context *context)
|
|
{
|
|
free_decompression_memory(context);
|
|
}
|
|
|
|
|
|
void LZX_DecodeNewGroup(t_decoder_context *context)
|
|
{
|
|
reset_decoder_trees(context);
|
|
decoder_misc_init(context);
|
|
init_decoder_translation(context);
|
|
context->dec_num_cfdata_frames = 0;
|
|
|
|
#ifdef BIT16
|
|
DComp_Reset(context);
|
|
#endif
|
|
}
|
|
|
|
|
|
int LZX_Decode(
|
|
t_decoder_context *context,
|
|
long bytes_to_decode,
|
|
byte * compressed_input_buffer,
|
|
long compressed_input_size,
|
|
byte * uncompressed_output_buffer,
|
|
long uncompressed_output_size,
|
|
long * bytes_decoded
|
|
)
|
|
{
|
|
long result;
|
|
|
|
context->dec_input_curpos = compressed_input_buffer;
|
|
context->dec_end_input_pos = (compressed_input_buffer + compressed_input_size + 4);
|
|
|
|
context->dec_output_buffer = uncompressed_output_buffer;
|
|
|
|
#ifdef BIT16
|
|
context->dec_output_curpos = uncompressed_output_buffer;
|
|
context->DComp.NumBytes = (unsigned short) uncompressed_output_size;
|
|
#endif
|
|
|
|
init_decoder_input(context);
|
|
|
|
result = decode_data(context, bytes_to_decode);
|
|
|
|
context->dec_num_cfdata_frames++;
|
|
|
|
if (result < 0)
|
|
{
|
|
*bytes_decoded = 0;
|
|
return 1; /* failure */
|
|
}
|
|
else
|
|
{
|
|
*bytes_decoded = result;
|
|
context->dec_position_at_start += result;
|
|
return 0; /* success */
|
|
}
|
|
}
|