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c unpacker now works

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This commit is contained in:
Dennis Ranke
2022-09-09 00:47:33 +02:00
parent f817dc9254
commit 4903ac3786
2 changed files with 9 additions and 7 deletions
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12
c_unpacker/unpack.c
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@@ -34,9 +34,9 @@ int upkr_decode_bit(int context_index) {
if(bit) {
upkr_state = prob * (upkr_state >> 8) + (upkr_state & 255);
upkr_probs[context_index] = prob + ((255 - prob + 8) >> 4);
upkr_probs[context_index] = prob + ((256 - prob + 8) >> 4);
} else {
upkr_state = (255 - prob) * (upkr_state >> 8) + (upkr_state & 255) - prob;
upkr_state = (256 - prob) * (upkr_state >> 8) + (upkr_state & 255) - prob;
upkr_probs[context_index] = prob - ((prob + 8) >> 4);
}
@@ -75,20 +75,18 @@ int upkr_unpack(void* destination, void* compressed_data) {
}
}
int length = upkr_decode_length(257 + 64);
while(length-- > 1) {
while(length--) {
*write_ptr = write_ptr[-offset];
++write_ptr;
}
prev_was_match = 1;
} else {
int context_index = 1;
int byte = 0;
u8 context_index = 1;
for(int i = 0; i < 8; ++i) {
int bit = upkr_decode_bit(context_index);
context_index = (context_index << 1) + bit;
byte |= bit << i;
}
*write_ptr++ = byte;
*write_ptr++ = context_index;
prev_was_match = 0;
}
}