1/*
2 * jstdhuff.c
3 *
4 * This file was part of the Independent JPEG Group's software:
5 * Copyright (C) 1991-1998, Thomas G. Lane.
6 * libjpeg-turbo Modifications:
7 * Copyright (C) 2013, D. R. Commander.
8 * For conditions of distribution and use, see the accompanying README.ijg
9 * file.
10 *
11 * This file contains routines to set the default Huffman tables, if they are
12 * not already set.
13 */
14
15/*
16 * Huffman table setup routines
17 */
18
19LOCAL(void)
20add_huff_table(j_common_ptr cinfo, JHUFF_TBL **htblptr, const UINT8 *bits,
21 const UINT8 *val)
22/* Define a Huffman table */
23{
24 int nsymbols, len;
25
26 if (*htblptr == NULL)
27 *htblptr = jpeg_alloc_huff_table(cinfo);
28 else
29 return;
30
31 /* Copy the number-of-symbols-of-each-code-length counts */
32 MEMCOPY((*htblptr)->bits, bits, sizeof((*htblptr)->bits));
33
34 /* Validate the counts. We do this here mainly so we can copy the right
35 * number of symbols from the val[] array, without risking marching off
36 * the end of memory. jchuff.c will do a more thorough test later.
37 */
38 nsymbols = 0;
39 for (len = 1; len <= 16; len++)
40 nsymbols += bits[len];
41 if (nsymbols < 1 || nsymbols > 256)
42 ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
43
44 MEMCOPY((*htblptr)->huffval, val, nsymbols * sizeof(UINT8));
45 MEMZERO(&((*htblptr)->huffval[nsymbols]), (256 - nsymbols) * sizeof(UINT8));
46
47 /* Initialize sent_table FALSE so table will be written to JPEG file. */
48 (*htblptr)->sent_table = FALSE;
49}
50
51
52LOCAL(void)
53std_huff_tables(j_common_ptr cinfo)
54/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
55/* IMPORTANT: these are only valid for 8-bit data precision! */
56{
57 JHUFF_TBL **dc_huff_tbl_ptrs, **ac_huff_tbl_ptrs;
58
59 static const UINT8 bits_dc_luminance[17] = {
60 /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0
61 };
62 static const UINT8 val_dc_luminance[] = {
63 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
64 };
65
66 static const UINT8 bits_dc_chrominance[17] = {
67 /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0
68 };
69 static const UINT8 val_dc_chrominance[] = {
70 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
71 };
72
73 static const UINT8 bits_ac_luminance[17] = {
74 /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d
75 };
76 static const UINT8 val_ac_luminance[] = {
77 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
78 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
79 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
80 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
81 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
82 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
83 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
84 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
85 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
86 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
87 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
88 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
89 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
90 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
91 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
92 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
93 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
94 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
95 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
96 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
97 0xf9, 0xfa
98 };
99
100 static const UINT8 bits_ac_chrominance[17] = {
101 /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77
102 };
103 static const UINT8 val_ac_chrominance[] = {
104 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
105 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
106 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
107 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
108 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
109 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
110 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
111 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
112 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
113 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
114 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
115 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
116 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
117 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
118 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
119 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
120 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
121 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
122 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
123 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
124 0xf9, 0xfa
125 };
126
127 if (cinfo->is_decompressor) {
128 dc_huff_tbl_ptrs = ((j_decompress_ptr)cinfo)->dc_huff_tbl_ptrs;
129 ac_huff_tbl_ptrs = ((j_decompress_ptr)cinfo)->ac_huff_tbl_ptrs;
130 } else {
131 dc_huff_tbl_ptrs = ((j_compress_ptr)cinfo)->dc_huff_tbl_ptrs;
132 ac_huff_tbl_ptrs = ((j_compress_ptr)cinfo)->ac_huff_tbl_ptrs;
133 }
134
135 add_huff_table(cinfo, &dc_huff_tbl_ptrs[0], bits_dc_luminance,
136 val_dc_luminance);
137 add_huff_table(cinfo, &ac_huff_tbl_ptrs[0], bits_ac_luminance,
138 val_ac_luminance);
139 add_huff_table(cinfo, &dc_huff_tbl_ptrs[1], bits_dc_chrominance,
140 val_dc_chrominance);
141 add_huff_table(cinfo, &ac_huff_tbl_ptrs[1], bits_ac_chrominance,
142 val_ac_chrominance);
143}
144