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devinacker 2013-10-29 08:47:27 -04:00
parent f8ed01c458
commit 66233bc3a9
1 changed files with 40 additions and 40 deletions
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80
compress.c
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@ -168,30 +168,30 @@ size_t unpack(uint8_t *packed, uint8_t *unpacked) {
break;
// 8-bit RLE
case 1:
for (int i = 0; i < length; i++)
unpacked[outpos++] = packed[inpos];
case 1:
for (int i = 0; i < length; i++)
unpacked[outpos++] = packed[inpos];
inpos++;
break;
inpos++;
break;
// 16-bit RLE
case 2:
for (int i = 0; i < length; i++) {
unpacked[outpos++] = packed[inpos];
unpacked[outpos++] = packed[inpos+1];
}
// 16-bit RLE
case 2:
for (int i = 0; i < length; i++) {
unpacked[outpos++] = packed[inpos];
unpacked[outpos++] = packed[inpos+1];
}
inpos += 2;
break;
inpos += 2;
break;
// 8-bit increasing sequence
case 3:
for (int i = 0; i < length; i++)
unpacked[outpos++] = packed[inpos] + i;
// 8-bit increasing sequence
case 3:
for (int i = 0; i < length; i++)
unpacked[outpos++] = packed[inpos] + i;
inpos++;
break;
inpos++;
break;
// regular backref
// (offset is big-endian)
@ -200,33 +200,33 @@ size_t unpack(uint8_t *packed, uint8_t *unpacked) {
// 7 isn't a real method number, but it behaves the same as 4 due to a quirk in how
// the original decompression routine is programmed. (one of Parasyte's docs confirms
// this for GB games as well). let's handle it anyway
command = 4;
command = 4;
offset = (packed[inpos] << 8) | packed[inpos+1];
for (int i = 0; i < length; i++)
unpacked[outpos++] = unpacked[offset + i];
offset = (packed[inpos] << 8) | packed[inpos+1];
for (int i = 0; i < length; i++)
unpacked[outpos++] = unpacked[offset + i];
inpos += 2;
break;
inpos += 2;
break;
// backref with bit rotation
// (offset is big-endian)
case 5:
offset = (packed[inpos] << 8) | packed[inpos+1];
for (int i = 0; i < length; i++)
unpacked[outpos++] = rotate(unpacked[offset + i]);
// backref with bit rotation
// (offset is big-endian)
case 5:
offset = (packed[inpos] << 8) | packed[inpos+1];
for (int i = 0; i < length; i++)
unpacked[outpos++] = rotate(unpacked[offset + i]);
inpos += 2;
break;
inpos += 2;
break;
// backwards backref
// (offset is big-endian)
case 6:
offset = (packed[inpos] << 8) | packed[inpos+1];
for (int i = 0; i < length; i++)
unpacked[outpos++] = unpacked[offset - i];
// backwards backref
// (offset is big-endian)
case 6:
offset = (packed[inpos] << 8) | packed[inpos+1];
for (int i = 0; i < length; i++)
unpacked[outpos++] = unpacked[offset - i];
inpos += 2;
inpos += 2;
}
// keep track of how many times each compression method is used