Line data Source code
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 :
19 : LOCAL(void)
20 0 : add_huff_table (j_common_ptr cinfo,
21 : JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val)
22 : /* Define a Huffman table */
23 : {
24 : int nsymbols, len;
25 :
26 0 : if (*htblptr == NULL)
27 0 : *htblptr = jpeg_alloc_huff_table(cinfo);
28 : else
29 0 : return;
30 :
31 : /* Copy the number-of-symbols-of-each-code-length counts */
32 0 : 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 0 : nsymbols = 0;
39 0 : for (len = 1; len <= 16; len++)
40 0 : nsymbols += bits[len];
41 0 : if (nsymbols < 1 || nsymbols > 256)
42 0 : ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
43 :
44 0 : MEMCOPY((*htblptr)->huffval, val, nsymbols * sizeof(UINT8));
45 0 : MEMZERO(&((*htblptr)->huffval[nsymbols]), (256 - nsymbols) * sizeof(UINT8));
46 :
47 : /* Initialize sent_table FALSE so table will be written to JPEG file. */
48 0 : (*htblptr)->sent_table = FALSE;
49 : }
50 :
51 :
52 : LOCAL(void)
53 0 : std_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 : static const UINT8 val_dc_luminance[] =
62 : { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
63 :
64 : static const UINT8 bits_dc_chrominance[17] =
65 : { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
66 : static const UINT8 val_dc_chrominance[] =
67 : { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
68 :
69 : static const UINT8 bits_ac_luminance[17] =
70 : { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
71 : static const UINT8 val_ac_luminance[] =
72 : { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
73 : 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
74 : 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
75 : 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
76 : 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
77 : 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
78 : 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
79 : 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
80 : 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
81 : 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
82 : 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
83 : 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
84 : 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
85 : 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
86 : 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
87 : 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
88 : 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
89 : 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
90 : 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
91 : 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
92 : 0xf9, 0xfa };
93 :
94 : static const UINT8 bits_ac_chrominance[17] =
95 : { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
96 : static const UINT8 val_ac_chrominance[] =
97 : { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
98 : 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
99 : 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
100 : 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
101 : 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
102 : 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
103 : 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
104 : 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
105 : 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
106 : 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
107 : 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
108 : 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
109 : 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
110 : 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
111 : 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
112 : 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
113 : 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
114 : 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
115 : 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
116 : 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
117 : 0xf9, 0xfa };
118 :
119 0 : if (cinfo->is_decompressor) {
120 0 : dc_huff_tbl_ptrs = ((j_decompress_ptr)cinfo)->dc_huff_tbl_ptrs;
121 0 : ac_huff_tbl_ptrs = ((j_decompress_ptr)cinfo)->ac_huff_tbl_ptrs;
122 : } else {
123 0 : dc_huff_tbl_ptrs = ((j_compress_ptr)cinfo)->dc_huff_tbl_ptrs;
124 0 : ac_huff_tbl_ptrs = ((j_compress_ptr)cinfo)->ac_huff_tbl_ptrs;
125 : }
126 :
127 0 : add_huff_table(cinfo, &dc_huff_tbl_ptrs[0], bits_dc_luminance,
128 : val_dc_luminance);
129 0 : add_huff_table(cinfo, &ac_huff_tbl_ptrs[0], bits_ac_luminance,
130 : val_ac_luminance);
131 0 : add_huff_table(cinfo, &dc_huff_tbl_ptrs[1], bits_dc_chrominance,
132 : val_dc_chrominance);
133 0 : add_huff_table(cinfo, &ac_huff_tbl_ptrs[1], bits_ac_chrominance,
134 : val_ac_chrominance);
135 0 : }
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