69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
|
/*
|
||
|
|
* d16uncmp.c
|
||
|
|
*
|
||
|
|
* Decoding uncompressed blocks
|
||
|
|
*/
|
||
|
|
#include "decoder.h"
|
||
|
|
|
||
|
|
|
||
|
|
int NEAR decode_uncompressed_block(
|
||
|
|
t_decoder_context * context,
|
||
|
|
long bufpos,
|
||
|
|
int amount_to_decode /* yes, it will equal 32768 */
|
||
|
|
)
|
||
|
|
{
|
||
|
|
byte *p;
|
||
|
|
|
||
|
|
p = context->dec_input_curpos;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Since this is a DO loop, we predecrement amount_to_decode,
|
||
|
|
* so it's ok for it to come in with a value of 32768
|
||
|
|
*/
|
||
|
|
do
|
||
|
|
{
|
||
|
|
if (p >= context->dec_end_input_pos)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
context->DComp_Token_Literal(
|
||
|
|
context,
|
||
|
|
*p++
|
||
|
|
);
|
||
|
|
} while (--amount_to_decode > 0);
|
||
|
|
|
||
|
|
context->dec_input_curpos = p;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
bool NEAR handle_beginning_of_uncompressed_block(t_decoder_context *context)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* we want to read the 16 bits already in bitbuf, so backtrack
|
||
|
|
* the input pointer by 2 bytes
|
||
|
|
*/
|
||
|
|
context->dec_input_curpos -= 2;
|
||
|
|
|
||
|
|
if (context->dec_input_curpos + 4 >= context->dec_end_input_pos)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* update LRU repeated offset list
|
||
|
|
*/
|
||
|
|
for (i = 0; i < NUM_REPEATED_OFFSETS; i++)
|
||
|
|
{
|
||
|
|
context->dec_last_matchpos_offset[i] =
|
||
|
|
((ulong) *( (byte *) context->dec_input_curpos) ) |
|
||
|
|
((ulong) *( ((byte *) context->dec_input_curpos) + 1) << 8) |
|
||
|
|
((ulong) *( ((byte *) context->dec_input_curpos) + 2) << 16) |
|
||
|
|
((ulong) *( ((byte *) context->dec_input_curpos) + 3) << 24);
|
||
|
|
|
||
|
|
context->dec_input_curpos += 4; /* increment by 4 bytes */
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|