src/libjpeg/jpeg-marker.c

   1 /* jpeg-marker.c
   2  *
   3  * Copyright © 2001-2008 Lutz Müller <lutz@users.sourceforge.net>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18  * Boston, MA  02110-1301  USA.
  19  */
  20 #include "config.h"
  21 #include "jpeg-marker.h"
  22
  23 #include <stdlib.h>
  24
  25 static const struct {
  26         JPEGMarker marker;
  27         const char *name;
  28         const char *description;
  29 } JPEGMarkerTable[] = {
  30         {JPEG_MARKER_SOF0, "SOF0", "Encoding (baseline)"},
  31         {JPEG_MARKER_SOF1, "SOF1", "Encoding (extended sequential)"},
  32         {JPEG_MARKER_SOF2, "SOF2", "Encoding (progressive)"},
  33         {JPEG_MARKER_SOF3, "SOF3", "Encoding (lossless)"},
  34         {JPEG_MARKER_SOF5, "SOF5", "Encoding (differential sequential)"},
  35         {JPEG_MARKER_SOF6, "SOF6", "Encoding (differential progressive)"},
  36         {JPEG_MARKER_SOF7, "SOF7", "Encoding (differential lossless)"},
  37         {JPEG_MARKER_SOF9, "SOF9",
  38                 "Encoding (extended sequential, arithmetic)"},
  39         {JPEG_MARKER_SOF10, "SOF10", "Encoding (progressive, arithmetic)"},
  40         {JPEG_MARKER_SOF11, "SOF11", "Encoding (lossless, arithmetic)"},
  41         {JPEG_MARKER_SOF13, "SOF13",
  42                 "Encoding (differential sequential, arithmetic)"},
  43         {JPEG_MARKER_SOF14, "SOF14",
  44                 "Encoding (differential progressive, arithmetic)"},
  45         {JPEG_MARKER_SOF15, "SOF15",
  46                 "Encoding (differential lossless, arithmetic)"},
  47         {JPEG_MARKER_SOI, "SOI", "Start of image"},
  48         {JPEG_MARKER_EOI, "EOI", "End of image"},
  49         {JPEG_MARKER_SOS, "SOS", "Start of scan"},
  50         {JPEG_MARKER_COM, "COM", "Comment"},
  51         {JPEG_MARKER_DHT, "DHT", "Define Huffman table"},
  52         {JPEG_MARKER_JPG, "JPG", "Extension"},
  53         {JPEG_MARKER_DAC, "DAC", "Define arithmetic coding conditioning"},
  54         {JPEG_MARKER_RST1, "RST1", "Restart 1"},
  55         {JPEG_MARKER_RST2, "RST2", "Restart 2"},
  56         {JPEG_MARKER_RST3, "RST3", "Restart 3"},
  57         {JPEG_MARKER_RST4, "RST4", "Restart 4"},
  58         {JPEG_MARKER_RST5, "RST5", "Restart 5"},
  59         {JPEG_MARKER_RST6, "RST6", "Restart 6"},
  60         {JPEG_MARKER_RST7, "RST7", "Restart 7"},
  61         {JPEG_MARKER_DQT, "DQT", "Define quantization table"},
  62         {JPEG_MARKER_DNL, "DNL", "Define number of lines"},
  63         {JPEG_MARKER_DRI, "DRI", "Define restart interval"},
  64         {JPEG_MARKER_DHP, "DHP", "Define hierarchical progression"},
  65         {JPEG_MARKER_EXP, "EXP", "Expand reference component"},
  66         {JPEG_MARKER_APP0, "APP0", "Application segment 0"},
  67         {JPEG_MARKER_APP1, "APP1", "Application segment 1"},
  68         {JPEG_MARKER_APP2, "APP2", "Application segment 2"},
  69         {JPEG_MARKER_APP3, "APP3", "Application segment 3"},
  70         {JPEG_MARKER_APP4, "APP4", "Application segment 4"},
  71         {JPEG_MARKER_APP5, "APP5", "Application segment 5"},
  72         {JPEG_MARKER_APP6, "APP6", "Application segment 6"},
  73         {JPEG_MARKER_APP7, "APP7", "Application segment 7"},
  74         {JPEG_MARKER_APP8, "APP8", "Application segment 8"},
  75         {JPEG_MARKER_APP9, "APP9", "Application segment 9"},
  76         {JPEG_MARKER_APP10, "APP10", "Application segment 10"},
  77         {JPEG_MARKER_APP11, "APP11", "Application segment 11"},
  78         {JPEG_MARKER_APP12, "APP12", "Application segment 12"},
  79         {JPEG_MARKER_APP13, "APP13", "Application segment 13"},
  80         {JPEG_MARKER_APP14, "APP14", "Application segment 14"},
  81         {JPEG_MARKER_APP15, "APP15", "Application segment 15"},
  82         {JPEG_MARKER_JPG0, "JPG0", "Extension 0"},
  83         {JPEG_MARKER_JPG1, "JPG1", "Extension 1"},
  84         {JPEG_MARKER_JPG2, "JPG2", "Extension 2"},
  85         {JPEG_MARKER_JPG3, "JPG3", "Extension 3"},
  86         {JPEG_MARKER_JPG4, "JPG4", "Extension 4"},
  87         {JPEG_MARKER_JPG5, "JPG5", "Extension 5"},
  88         {JPEG_MARKER_JPG6, "JPG6", "Extension 6"},
  89         {JPEG_MARKER_JPG7, "JPG7", "Extension 7"},
  90         {JPEG_MARKER_JPG8, "JPG8", "Extension 8"},
  91         {JPEG_MARKER_JPG9, "JPG9", "Extension 9"},
  92         {JPEG_MARKER_JPG10, "JPG10", "Extension 10"},
  93         {JPEG_MARKER_JPG11, "JPG11", "Extension 11"},
  94         {JPEG_MARKER_JPG12, "JPG12", "Extension 12"},
  95         {JPEG_MARKER_JPG13, "JPG13", "Extension 13"},
  96         {0, NULL, NULL}
  97 };
  98
  99 const char *
 100 jpeg_marker_get_name (JPEGMarker marker)
 101 {
 102         unsigned int i;
 103
 104         for (i = 0; JPEGMarkerTable[i].name; i++)
 105                 if (JPEGMarkerTable[i].marker == marker)
 106                         break;
 107
 108         return (JPEGMarkerTable[i].name);
 109 }
 110
 111 const char *
 112 jpeg_marker_get_description (JPEGMarker marker)
 113 {
 114         unsigned int i;
 115
 116         for (i = 0; JPEGMarkerTable[i].description; i++)
 117                 if (JPEGMarkerTable[i].marker == marker)
 118                         break;
 119
 120         return (JPEGMarkerTable[i].description);
 121 }
 122