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/*
* PSn00bSDK MDEC library (support code for the main VLC decompressor)
* (C) 2022-2023 spicyjpeg - MPL licensed
*/
#include <stdint.h>
#include <stddef.h>
#include <string.h>
#include <psxpress.h>
/* Huffman code lookup table */
#define _DC(y, c) (((y) << 4) | (c))
#define _AC(rl, dc) (((rl) << 10) | ((uint16_t) (dc) & 0x3ff))
#define _ACL(rl, dc, len) (_AC(rl, dc) | ((len) << 16))
#define _DC2(y, c) _DC(y, c), _DC(y, c)
#define _DC3(y, c) _DC(y, c), _DC(y, c), _DC(y, c), _DC(y, c)
#define _DC4(y, c) \
_DC(y, c), _DC(y, c), _DC(y, c), _DC(y, c), \
_DC(y, c), _DC(y, c), _DC(y, c), _DC(y, c)
#define _AC2(rl, dc) _AC(rl, dc), _AC(rl, -(dc))
#define _ACL2(rl, dc, len) _ACL(rl, dc, len), _ACL(rl, -(dc), len)
#define _ACL3(rl, dc, len) \
_ACL(rl, dc, len), _ACL(rl, dc, len), \
_ACL(rl, -(dc), len), _ACL(rl, -(dc), len)
#define _ACL4(rl, dc, len) \
_ACL(rl, dc, len), _ACL(rl, dc, len), _ACL(rl, dc, len), _ACL(rl, dc, len), \
_ACL(rl, dc, len), _ACL(rl, dc, len), _ACL(rl, dc, len), _ACL(rl, dc, len), \
_ACL(rl, -(dc), len), _ACL(rl, -(dc), len), _ACL(rl, -(dc), len), _ACL(rl, -(dc), len), \
_ACL(rl, -(dc), len), _ACL(rl, -(dc), len), _ACL(rl, -(dc), len), _ACL(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 VLC_TableV3 _default_huffman_table = {
.ac0 = {
// 11 x
_AC2( 0, 1)
},
.ac2 = {
// 01 0xx
_ACL2( 0, 2, 5), _ACL2( 2, 1, 5),
// 01 1x-
_ACL3( 1, 1, 4)
},
.ac3 = {
// 001 00xxxx
_ACL2(13, 1, 9), _ACL2( 0, 6, 9), _ACL2(12, 1, 9), _ACL2(11, 1, 9),
_ACL2( 3, 2, 9), _ACL2( 1, 3, 9), _ACL2( 0, 5, 9), _ACL2(10, 1, 9),
// 001 xxx---
_ACL4( 0, 3, 6), _ACL4( 4, 1, 6), _ACL4( 3, 1, 6)
},
.ac4 = {
// 0001 xxx
_AC2( 7, 1), _AC2( 6, 1), _AC2( 1, 2), _AC2( 5, 1)
},
.ac5 = {
// 00001 xxx
_AC2( 2, 2), _AC2( 9, 1), _AC2( 0, 4), _AC2( 8, 1)
},
.ac7 = {
// 0000001 xxxx
_AC2(16, 1), _AC2( 5, 2), _AC2( 0, 7), _AC2( 2, 3),
_AC2( 1, 4), _AC2(15, 1), _AC2(14, 1), _AC2( 4, 2)
},
.ac8 = {
// 00000001 xxxxx
_AC2( 0, 11), _AC2( 8, 2), _AC2( 4, 3), _AC2( 0, 10),
_AC2( 2, 4), _AC2( 7, 2), _AC2(21, 1), _AC2(20, 1),
_AC2( 0, 9), _AC2(19, 1), _AC2(18, 1), _AC2( 1, 5),
_AC2( 3, 3), _AC2( 0, 8), _AC2( 6, 2), _AC2(17, 1)
},
.ac9 = {
// 000000001 xxxxx
_AC2(10, 2), _AC2( 9, 2), _AC2( 5, 3), _AC2( 3, 4),
_AC2( 2, 5), _AC2( 1, 7), _AC2( 1, 6), _AC2( 0, 15),
_AC2( 0, 14), _AC2( 0, 13), _AC2( 0, 12), _AC2(26, 1),
_AC2(25, 1), _AC2(24, 1), _AC2(23, 1), _AC2(22, 1)
},
.ac10 = {
// 0000000001 xxxxx
_AC2( 0, 31), _AC2( 0, 30), _AC2( 0, 29), _AC2( 0, 28),
_AC2( 0, 27), _AC2( 0, 26), _AC2( 0, 25), _AC2( 0, 24),
_AC2( 0, 23), _AC2( 0, 22), _AC2( 0, 21), _AC2( 0, 20),
_AC2( 0, 19), _AC2( 0, 18), _AC2( 0, 17), _AC2( 0, 16)
},
.ac11 = {
// 00000000001 xxxxx
_AC2( 0, 40), _AC2( 0, 39), _AC2( 0, 38), _AC2( 0, 37),
_AC2( 0, 36), _AC2( 0, 35), _AC2( 0, 34), _AC2( 0, 33),
_AC2( 0, 32), _AC2( 1, 14), _AC2( 1, 13), _AC2( 1, 12),
_AC2( 1, 11), _AC2( 1, 10), _AC2( 1, 9), _AC2( 1, 8)
},
.ac12 = {
// 000000000001 xxxxx
_AC2( 1, 18), _AC2( 1, 17), _AC2( 1, 16), _AC2( 1, 15),
_AC2( 6, 3), _AC2(16, 2), _AC2(15, 2), _AC2(14, 2),
_AC2(13, 2), _AC2(12, 2), _AC2(11, 2), _AC2(31, 1),
_AC2(30, 1), _AC2(29, 1), _AC2(28, 1), _AC2(27, 1)
},
.dc = {
// 00-----
_DC4(1, 0), _DC4(1, 0), _DC4(1, 0), _DC4(1, 0),
// 01-----
_DC4(2, 1), _DC4(2, 1), _DC4(2, 1), _DC4(2, 1),
// 100----
_DC4(0, 2), _DC4(0, 2),
// 101----
_DC4(3, 2), _DC4(3, 2),
// 110----
_DC4(4, 3), _DC4(4, 3),
// 1110---
_DC4(5, 4),
// 11110--
_DC3(6, 5),
// 111110-
_DC2(7, 6),
// 1111110
_DC(8, 7),
// 1111111(0)
_DC(0, 8)
},
.dc_len = {
_DC(3, 2), _DC(2, 2), _DC(2, 2), _DC(3, 3),
_DC(3, 4), _DC(4, 5), _DC(5, 6), _DC(6, 7),
_DC(7, 8)
}
};
/* 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 VLC_TableV3 *_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 DecDCTvlcCopyTableV2(VLC_TableV2 *addr) {
if (addr) {
_vlc_huffman_table = (const VLC_TableV3 *) addr;
memcpy(addr, &_default_huffman_table, sizeof(VLC_TableV2));
} else {
_vlc_huffman_table = &_default_huffman_table;
}
}
void DecDCTvlcCopyTableV3(VLC_TableV3 *addr) {
if (addr) {
_vlc_huffman_table = (const VLC_TableV3 *) addr;
memcpy(addr, &_default_huffman_table, sizeof(VLC_TableV3));
} else {
_vlc_huffman_table = &_default_huffman_table;
}
}
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