media/libjpeg/jstdhuff.c@b8a032363ba2 (annotated)
media/libjpeg/jstdhuff.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* |
| michael@0 | 2 | * jstdhuff.c |
| michael@0 | 3 | * |
| michael@0 | 4 | * This file was part of the Independent JPEG Group's software: |
| michael@0 | 5 | * Copyright (C) 1991-1998, Thomas G. Lane. |
| michael@0 | 6 | * libjpeg-turbo Modifications: |
| michael@0 | 7 | * Copyright (C) 2013, D. R. Commander. |
| michael@0 | 8 | * For conditions of distribution and use, see the accompanying README file. |
| michael@0 | 9 | * |
| michael@0 | 10 | * This file contains routines to set the default Huffman tables, if they are |
| michael@0 | 11 | * not already set. |
| michael@0 | 12 | */ |
| michael@0 | 13 | |
| michael@0 | 14 | /* |
| michael@0 | 15 | * Huffman table setup routines |
| michael@0 | 16 | */ |
| michael@0 | 17 | |
| michael@0 | 18 | LOCAL(void) |
| michael@0 | 19 | add_huff_table (j_common_ptr cinfo, |
| michael@0 | 20 | JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val) |
| michael@0 | 21 | /* Define a Huffman table */ |
| michael@0 | 22 | { |
| michael@0 | 23 | int nsymbols, len; |
| michael@0 | 24 | |
| michael@0 | 25 | if (*htblptr == NULL) |
| michael@0 | 26 | *htblptr = jpeg_alloc_huff_table(cinfo); |
| michael@0 | 27 | else |
| michael@0 | 28 | return; |
| michael@0 | 29 | |
| michael@0 | 30 | /* Copy the number-of-symbols-of-each-code-length counts */ |
| michael@0 | 31 | MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits)); |
| michael@0 | 32 | |
| michael@0 | 33 | /* Validate the counts. We do this here mainly so we can copy the right |
| michael@0 | 34 | * number of symbols from the val[] array, without risking marching off |
| michael@0 | 35 | * the end of memory. jchuff.c will do a more thorough test later. |
| michael@0 | 36 | */ |
| michael@0 | 37 | nsymbols = 0; |
| michael@0 | 38 | for (len = 1; len <= 16; len++) |
| michael@0 | 39 | nsymbols += bits[len]; |
| michael@0 | 40 | if (nsymbols < 1 || nsymbols > 256) |
| michael@0 | 41 | ERREXIT(cinfo, JERR_BAD_HUFF_TABLE); |
| michael@0 | 42 | |
| michael@0 | 43 | MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8)); |
| michael@0 | 44 | |
| michael@0 | 45 | /* Initialize sent_table FALSE so table will be written to JPEG file. */ |
| michael@0 | 46 | (*htblptr)->sent_table = FALSE; |
| michael@0 | 47 | } |
| michael@0 | 48 | |
| michael@0 | 49 | |
| michael@0 | 50 | LOCAL(void) |
| michael@0 | 51 | std_huff_tables (j_common_ptr cinfo) |
| michael@0 | 52 | /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */ |
| michael@0 | 53 | /* IMPORTANT: these are only valid for 8-bit data precision! */ |
| michael@0 | 54 | { |
| michael@0 | 55 | JHUFF_TBL **dc_huff_tbl_ptrs, **ac_huff_tbl_ptrs; |
| michael@0 | 56 | |
| michael@0 | 57 | static const UINT8 bits_dc_luminance[17] = |
| michael@0 | 58 | { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; |
| michael@0 | 59 | static const UINT8 val_dc_luminance[] = |
| michael@0 | 60 | { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; |
| michael@0 | 61 | |
| michael@0 | 62 | static const UINT8 bits_dc_chrominance[17] = |
| michael@0 | 63 | { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; |
| michael@0 | 64 | static const UINT8 val_dc_chrominance[] = |
| michael@0 | 65 | { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; |
| michael@0 | 66 | |
| michael@0 | 67 | static const UINT8 bits_ac_luminance[17] = |
| michael@0 | 68 | { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; |
| michael@0 | 69 | static const UINT8 val_ac_luminance[] = |
| michael@0 | 70 | { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, |
| michael@0 | 71 | 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, |
| michael@0 | 72 | 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, |
| michael@0 | 73 | 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, |
| michael@0 | 74 | 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, |
| michael@0 | 75 | 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, |
| michael@0 | 76 | 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, |
| michael@0 | 77 | 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, |
| michael@0 | 78 | 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, |
| michael@0 | 79 | 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, |
| michael@0 | 80 | 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, |
| michael@0 | 81 | 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, |
| michael@0 | 82 | 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, |
| michael@0 | 83 | 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, |
| michael@0 | 84 | 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, |
| michael@0 | 85 | 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, |
| michael@0 | 86 | 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, |
| michael@0 | 87 | 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, |
| michael@0 | 88 | 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, |
| michael@0 | 89 | 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
| michael@0 | 90 | 0xf9, 0xfa }; |
| michael@0 | 91 | |
| michael@0 | 92 | static const UINT8 bits_ac_chrominance[17] = |
| michael@0 | 93 | { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; |
| michael@0 | 94 | static const UINT8 val_ac_chrominance[] = |
| michael@0 | 95 | { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, |
| michael@0 | 96 | 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, |
| michael@0 | 97 | 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, |
| michael@0 | 98 | 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, |
| michael@0 | 99 | 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, |
| michael@0 | 100 | 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, |
| michael@0 | 101 | 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, |
| michael@0 | 102 | 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, |
| michael@0 | 103 | 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, |
| michael@0 | 104 | 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, |
| michael@0 | 105 | 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, |
| michael@0 | 106 | 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
| michael@0 | 107 | 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, |
| michael@0 | 108 | 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, |
| michael@0 | 109 | 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, |
| michael@0 | 110 | 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, |
| michael@0 | 111 | 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, |
| michael@0 | 112 | 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, |
| michael@0 | 113 | 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, |
| michael@0 | 114 | 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
| michael@0 | 115 | 0xf9, 0xfa }; |
| michael@0 | 116 | |
| michael@0 | 117 | if (cinfo->is_decompressor) { |
| michael@0 | 118 | dc_huff_tbl_ptrs = ((j_decompress_ptr)cinfo)->dc_huff_tbl_ptrs; |
| michael@0 | 119 | ac_huff_tbl_ptrs = ((j_decompress_ptr)cinfo)->ac_huff_tbl_ptrs; |
| michael@0 | 120 | } else { |
| michael@0 | 121 | dc_huff_tbl_ptrs = ((j_compress_ptr)cinfo)->dc_huff_tbl_ptrs; |
| michael@0 | 122 | ac_huff_tbl_ptrs = ((j_compress_ptr)cinfo)->ac_huff_tbl_ptrs; |
| michael@0 | 123 | } |
| michael@0 | 124 | |
| michael@0 | 125 | add_huff_table(cinfo, &dc_huff_tbl_ptrs[0], bits_dc_luminance, |
| michael@0 | 126 | val_dc_luminance); |
| michael@0 | 127 | add_huff_table(cinfo, &ac_huff_tbl_ptrs[0], bits_ac_luminance, |
| michael@0 | 128 | val_ac_luminance); |
| michael@0 | 129 | add_huff_table(cinfo, &dc_huff_tbl_ptrs[1], bits_dc_chrominance, |
| michael@0 | 130 | val_dc_chrominance); |
| michael@0 | 131 | add_huff_table(cinfo, &ac_huff_tbl_ptrs[1], bits_ac_chrominance, |
| michael@0 | 132 | val_ac_chrominance); |
| michael@0 | 133 | } |
