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/*
* PSn00bSDK MDEC library (support code for the main VLC decompressor)
* (C) 2022 spicyjpeg - MPL licensed
*/
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <psxpress.h>
/* Huffman code lookup table */
#define _val1(rl, dc) (((rl) << 10) | ((uint16_t) (dc) & 0x3ff))
#define _val2(rl, dc, len) (_val1(rl, dc) | (len << 16))
#define _pair(rl, dc) _val1(rl, dc), _val1(rl, -(dc))
#define _pair2(rl, dc, len) _val2(rl, dc, len), _val2(rl, -(dc), len)
#define _pair3(rl, dc, len) \
_val2(rl, dc, len), _val2(rl, dc, len), \
_val2(rl, -(dc), len), _val2(rl, -(dc), len)
#define _pair4(rl, dc, len) \
_val2(rl, dc, len), _val2(rl, dc, len), _val2(rl, dc, len), _val2(rl, dc, len), \
_val2(rl, dc, len), _val2(rl, dc, len), _val2(rl, dc, len), _val2(rl, dc, len), \
_val2(rl, -(dc), len), _val2(rl, -(dc), len), _val2(rl, -(dc), len), _val2(rl, -(dc), len), \
_val2(rl, -(dc), len), _val2(rl, -(dc), len), _val2(rl, -(dc), len), _val2(rl, -(dc), len)
// This table isn't compressed since it makes no sense to compress less than a
// kilobyte's worth of data.
static const DECDCTTAB _default_huffman_table = {
.lut0 = {
// 11 x
_pair( 0, 1)
},
.lut2 = {
// 01 0xx
_pair2( 0, 2, 5), _pair2( 2, 1, 5),
// 01 1x-
_pair3( 1, 1, 4)
},
.lut3 = {
// 001 00xxxx
_pair2(13, 1, 9), _pair2( 0, 6, 9), _pair2(12, 1, 9), _pair2(11, 1, 9),
_pair2( 3, 2, 9), _pair2( 1, 3, 9), _pair2( 0, 5, 9), _pair2(10, 1, 9),
// 001 xxx---
_pair4( 0, 3, 6), _pair4( 4, 1, 6), _pair4( 3, 1, 6)
},
.lut4 = {
// 0001 xxx
_pair( 7, 1), _pair( 6, 1), _pair( 1, 2), _pair( 5, 1)
},
.lut5 = {
// 00001 xxx
_pair( 2, 2), _pair( 9, 1), _pair( 0, 4), _pair( 8, 1)
},
.lut7 = {
// 0000001 xxxx
_pair(16, 1), _pair( 5, 2), _pair( 0, 7), _pair( 2, 3),
_pair( 1, 4), _pair(15, 1), _pair(14, 1), _pair( 4, 2)
},
.lut8 = {
// 00000001 xxxxx
_pair( 0, 11), _pair( 8, 2), _pair( 4, 3), _pair( 0, 10),
_pair( 2, 4), _pair( 7, 2), _pair(21, 1), _pair(20, 1),
_pair( 0, 9), _pair(19, 1), _pair(18, 1), _pair( 1, 5),
_pair( 3, 3), _pair( 0, 8), _pair( 6, 2), _pair(17, 1)
},
.lut9 = {
// 000000001 xxxxx
_pair(10, 2), _pair( 9, 2), _pair( 5, 3), _pair( 3, 4),
_pair( 2, 5), _pair( 1, 7), _pair( 1, 6), _pair( 0, 15),
_pair( 0, 14), _pair( 0, 13), _pair( 0, 12), _pair(26, 1),
_pair(25, 1), _pair(24, 1), _pair(23, 1), _pair(22, 1)
},
.lut10 = {
// 0000000001 xxxxx
_pair( 0, 31), _pair( 0, 30), _pair( 0, 29), _pair( 0, 28),
_pair( 0, 27), _pair( 0, 26), _pair( 0, 25), _pair( 0, 24),
_pair( 0, 23), _pair( 0, 22), _pair( 0, 21), _pair( 0, 20),
_pair( 0, 19), _pair( 0, 18), _pair( 0, 17), _pair( 0, 16)
},
.lut11 = {
// 00000000001 xxxxx
_pair( 0, 40), _pair( 0, 39), _pair( 0, 38), _pair( 0, 37),
_pair( 0, 36), _pair( 0, 35), _pair( 0, 34), _pair( 0, 33),
_pair( 0, 32), _pair( 1, 14), _pair( 1, 13), _pair( 1, 12),
_pair( 1, 11), _pair( 1, 10), _pair( 1, 9), _pair( 1, 8)
},
.lut12 = {
// 000000000001 xxxxx
_pair( 1, 18), _pair( 1, 17), _pair( 1, 16), _pair( 1, 15),
_pair( 6, 3), _pair(16, 2), _pair(15, 2), _pair(14, 2),
_pair(13, 2), _pair(12, 2), _pair(11, 2), _pair(31, 1),
_pair(30, 1), _pair(29, 1), _pair(28, 1), _pair(27, 1)
}
};
/* Internal globals */
// Note that DecDCTvlc() and DecDCTvlc2() do *not* share the same variables.
static VLC_Context _default_context;
static size_t _max_buffer_size = 0;
const DECDCTTAB *_vlc_huffman_table = &_default_huffman_table;
/* Stateful VLC decoder API (for Sony SDK compatibility) */
int DecDCTvlc(const uint32_t *bs, uint32_t *buf) {
if (bs)
return DecDCTvlcStart(&_default_context, buf, _max_buffer_size, bs);
else
return DecDCTvlcContinue(&_default_context, buf, _max_buffer_size);
}
size_t DecDCTvlcSize(size_t size) {
size_t old_size = _max_buffer_size;
_max_buffer_size = size;
return old_size;
}
/* Lookup table relocation API */
void DecDCTvlcCopyTable(DECDCTTAB *addr) {
if (addr) {
_vlc_huffman_table = addr;
memcpy(addr, &_default_huffman_table, sizeof(DECDCTTAB));
} else {
_vlc_huffman_table = &_default_huffman_table;
}
}
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