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nuclear@2
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1 /*
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2 * jdmarker.c
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3 *
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4 * Copyright (C) 1991-1998, Thomas G. Lane.
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5 * This file is part of the Independent JPEG Group's software.
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6 * For conditions of distribution and use, see the accompanying README file.
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7 *
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8 * This file contains routines to decode JPEG datastream markers.
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9 * Most of the complexity arises from our desire to support input
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10 * suspension: if not all of the data for a marker is available,
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11 * we must exit back to the application. On resumption, we reprocess
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12 * the marker.
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13 */
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14
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15 #define JPEG_INTERNALS
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16 #include "jinclude.h"
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17 #include "jpeglib.h"
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18
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19
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20 typedef enum { /* JPEG marker codes */
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21 M_SOF0 = 0xc0,
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22 M_SOF1 = 0xc1,
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23 M_SOF2 = 0xc2,
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24 M_SOF3 = 0xc3,
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25
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26 M_SOF5 = 0xc5,
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27 M_SOF6 = 0xc6,
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28 M_SOF7 = 0xc7,
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29
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30 M_JPG = 0xc8,
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31 M_SOF9 = 0xc9,
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32 M_SOF10 = 0xca,
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33 M_SOF11 = 0xcb,
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34
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35 M_SOF13 = 0xcd,
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36 M_SOF14 = 0xce,
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37 M_SOF15 = 0xcf,
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38
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39 M_DHT = 0xc4,
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40
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41 M_DAC = 0xcc,
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42
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43 M_RST0 = 0xd0,
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44 M_RST1 = 0xd1,
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45 M_RST2 = 0xd2,
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46 M_RST3 = 0xd3,
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47 M_RST4 = 0xd4,
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48 M_RST5 = 0xd5,
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49 M_RST6 = 0xd6,
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50 M_RST7 = 0xd7,
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51
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52 M_SOI = 0xd8,
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53 M_EOI = 0xd9,
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54 M_SOS = 0xda,
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55 M_DQT = 0xdb,
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56 M_DNL = 0xdc,
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57 M_DRI = 0xdd,
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58 M_DHP = 0xde,
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59 M_EXP = 0xdf,
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60
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61 M_APP0 = 0xe0,
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62 M_APP1 = 0xe1,
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63 M_APP2 = 0xe2,
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64 M_APP3 = 0xe3,
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65 M_APP4 = 0xe4,
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66 M_APP5 = 0xe5,
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67 M_APP6 = 0xe6,
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68 M_APP7 = 0xe7,
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69 M_APP8 = 0xe8,
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70 M_APP9 = 0xe9,
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71 M_APP10 = 0xea,
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72 M_APP11 = 0xeb,
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73 M_APP12 = 0xec,
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74 M_APP13 = 0xed,
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75 M_APP14 = 0xee,
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76 M_APP15 = 0xef,
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77
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78 M_JPG0 = 0xf0,
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79 M_JPG13 = 0xfd,
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80 M_COM = 0xfe,
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81
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82 M_TEM = 0x01,
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83
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84 M_ERROR = 0x100
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85 } JPEG_MARKER;
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86
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87
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88 /* Private state */
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89
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90 typedef struct {
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91 struct jpeg_marker_reader pub; /* public fields */
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92
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93 /* Application-overridable marker processing methods */
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94 jpeg_marker_parser_method process_COM;
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95 jpeg_marker_parser_method process_APPn[16];
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96
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97 /* Limit on marker data length to save for each marker type */
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98 unsigned int length_limit_COM;
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99 unsigned int length_limit_APPn[16];
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100
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101 /* Status of COM/APPn marker saving */
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102 jpeg_saved_marker_ptr cur_marker; /* NULL if not processing a marker */
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103 unsigned int bytes_read; /* data bytes read so far in marker */
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104 /* Note: cur_marker is not linked into marker_list until it's all read. */
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105 } my_marker_reader;
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106
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107 typedef my_marker_reader * my_marker_ptr;
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108
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109
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110 /*
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111 * Macros for fetching data from the data source module.
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112 *
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113 * At all times, cinfo->src->next_input_byte and ->bytes_in_buffer reflect
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114 * the current restart point; we update them only when we have reached a
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115 * suitable place to restart if a suspension occurs.
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116 */
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117
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118 /* Declare and initialize local copies of input pointer/count */
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119 #define INPUT_VARS(cinfo) \
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120 struct jpeg_source_mgr * datasrc = (cinfo)->src; \
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121 const JOCTET * next_input_byte = datasrc->next_input_byte; \
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122 size_t bytes_in_buffer = datasrc->bytes_in_buffer
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123
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124 /* Unload the local copies --- do this only at a restart boundary */
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125 #define INPUT_SYNC(cinfo) \
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126 ( datasrc->next_input_byte = next_input_byte, \
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127 datasrc->bytes_in_buffer = bytes_in_buffer )
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128
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129 /* Reload the local copies --- used only in MAKE_BYTE_AVAIL */
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130 #define INPUT_RELOAD(cinfo) \
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131 ( next_input_byte = datasrc->next_input_byte, \
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132 bytes_in_buffer = datasrc->bytes_in_buffer )
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133
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134 /* Internal macro for INPUT_BYTE and INPUT_2BYTES: make a byte available.
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135 * Note we do *not* do INPUT_SYNC before calling fill_input_buffer,
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136 * but we must reload the local copies after a successful fill.
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137 */
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138 #define MAKE_BYTE_AVAIL(cinfo,action) \
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139 if (bytes_in_buffer == 0) { \
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140 if (! (*datasrc->fill_input_buffer) (cinfo)) \
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141 { action; } \
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142 INPUT_RELOAD(cinfo); \
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143 }
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144
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145 /* Read a byte into variable V.
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146 * If must suspend, take the specified action (typically "return FALSE").
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147 */
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148 #define INPUT_BYTE(cinfo,V,action) \
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149 MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \
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150 bytes_in_buffer--; \
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151 V = GETJOCTET(*next_input_byte++); )
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152
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153 /* As above, but read two bytes interpreted as an unsigned 16-bit integer.
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154 * V should be declared unsigned int or perhaps INT32.
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155 */
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156 #define INPUT_2BYTES(cinfo,V,action) \
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157 MAKESTMT( MAKE_BYTE_AVAIL(cinfo,action); \
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158 bytes_in_buffer--; \
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159 V = ((unsigned int) GETJOCTET(*next_input_byte++)) << 8; \
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160 MAKE_BYTE_AVAIL(cinfo,action); \
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161 bytes_in_buffer--; \
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162 V += GETJOCTET(*next_input_byte++); )
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163
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164
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165 /*
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166 * Routines to process JPEG markers.
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167 *
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168 * Entry condition: JPEG marker itself has been read and its code saved
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169 * in cinfo->unread_marker; input restart point is just after the marker.
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170 *
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171 * Exit: if return TRUE, have read and processed any parameters, and have
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172 * updated the restart point to point after the parameters.
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173 * If return FALSE, was forced to suspend before reaching end of
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174 * marker parameters; restart point has not been moved. Same routine
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175 * will be called again after application supplies more input data.
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176 *
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177 * This approach to suspension assumes that all of a marker's parameters
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178 * can fit into a single input bufferload. This should hold for "normal"
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179 * markers. Some COM/APPn markers might have large parameter segments
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180 * that might not fit. If we are simply dropping such a marker, we use
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181 * skip_input_data to get past it, and thereby put the problem on the
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182 * source manager's shoulders. If we are saving the marker's contents
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183 * into memory, we use a slightly different convention: when forced to
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184 * suspend, the marker processor updates the restart point to the end of
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185 * what it's consumed (ie, the end of the buffer) before returning FALSE.
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186 * On resumption, cinfo->unread_marker still contains the marker code,
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187 * but the data source will point to the next chunk of marker data.
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188 * The marker processor must retain internal state to deal with this.
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189 *
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190 * Note that we don't bother to avoid duplicate trace messages if a
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191 * suspension occurs within marker parameters. Other side effects
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192 * require more care.
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193 */
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194
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195
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196 LOCAL(boolean)
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197 get_soi (j_decompress_ptr cinfo)
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198 /* Process an SOI marker */
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199 {
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200 int i;
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201
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202 TRACEMS(cinfo, 1, JTRC_SOI);
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203
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204 if (cinfo->marker->saw_SOI)
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205 ERREXIT(cinfo, JERR_SOI_DUPLICATE);
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206
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207 /* Reset all parameters that are defined to be reset by SOI */
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208
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209 for (i = 0; i < NUM_ARITH_TBLS; i++) {
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210 cinfo->arith_dc_L[i] = 0;
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211 cinfo->arith_dc_U[i] = 1;
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212 cinfo->arith_ac_K[i] = 5;
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213 }
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214 cinfo->restart_interval = 0;
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215
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216 /* Set initial assumptions for colorspace etc */
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217
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218 cinfo->jpeg_color_space = JCS_UNKNOWN;
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219 cinfo->CCIR601_sampling = FALSE; /* Assume non-CCIR sampling??? */
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220
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221 cinfo->saw_JFIF_marker = FALSE;
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222 cinfo->JFIF_major_version = 1; /* set default JFIF APP0 values */
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223 cinfo->JFIF_minor_version = 1;
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224 cinfo->density_unit = 0;
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225 cinfo->X_density = 1;
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226 cinfo->Y_density = 1;
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227 cinfo->saw_Adobe_marker = FALSE;
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228 cinfo->Adobe_transform = 0;
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229
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230 cinfo->marker->saw_SOI = TRUE;
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231
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232 return TRUE;
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233 }
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234
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235
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236 LOCAL(boolean)
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237 get_sof (j_decompress_ptr cinfo, boolean is_prog, boolean is_arith)
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238 /* Process a SOFn marker */
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239 {
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240 INT32 length;
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241 int c, ci;
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242 jpeg_component_info * compptr;
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243 INPUT_VARS(cinfo);
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244
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245 cinfo->progressive_mode = is_prog;
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246 cinfo->arith_code = is_arith;
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247
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248 INPUT_2BYTES(cinfo, length, return FALSE);
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249
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250 INPUT_BYTE(cinfo, cinfo->data_precision, return FALSE);
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251 INPUT_2BYTES(cinfo, cinfo->image_height, return FALSE);
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252 INPUT_2BYTES(cinfo, cinfo->image_width, return FALSE);
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253 INPUT_BYTE(cinfo, cinfo->num_components, return FALSE);
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254
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255 length -= 8;
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256
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257 TRACEMS4(cinfo, 1, JTRC_SOF, cinfo->unread_marker,
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258 (int) cinfo->image_width, (int) cinfo->image_height,
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259 cinfo->num_components);
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260
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261 if (cinfo->marker->saw_SOF)
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262 ERREXIT(cinfo, JERR_SOF_DUPLICATE);
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263
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264 /* We don't support files in which the image height is initially specified */
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265 /* as 0 and is later redefined by DNL. As long as we have to check that, */
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266 /* might as well have a general sanity check. */
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267 if (cinfo->image_height <= 0 || cinfo->image_width <= 0
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268 || cinfo->num_components <= 0)
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269 ERREXIT(cinfo, JERR_EMPTY_IMAGE);
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270
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271 if (length != (cinfo->num_components * 3))
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272 ERREXIT(cinfo, JERR_BAD_LENGTH);
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273
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274 if (cinfo->comp_info == NULL) /* do only once, even if suspend */
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275 cinfo->comp_info = (jpeg_component_info *) (*cinfo->mem->alloc_small)
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276 ((j_common_ptr) cinfo, JPOOL_IMAGE,
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277 cinfo->num_components * SIZEOF(jpeg_component_info));
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278
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279 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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280 ci++, compptr++) {
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281 compptr->component_index = ci;
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282 INPUT_BYTE(cinfo, compptr->component_id, return FALSE);
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283 INPUT_BYTE(cinfo, c, return FALSE);
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284 compptr->h_samp_factor = (c >> 4) & 15;
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285 compptr->v_samp_factor = (c ) & 15;
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286 INPUT_BYTE(cinfo, compptr->quant_tbl_no, return FALSE);
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287
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288 TRACEMS4(cinfo, 1, JTRC_SOF_COMPONENT,
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289 compptr->component_id, compptr->h_samp_factor,
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290 compptr->v_samp_factor, compptr->quant_tbl_no);
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291 }
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292
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293 cinfo->marker->saw_SOF = TRUE;
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294
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295 INPUT_SYNC(cinfo);
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296 return TRUE;
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297 }
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298
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299
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300 LOCAL(boolean)
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301 get_sos (j_decompress_ptr cinfo)
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302 /* Process a SOS marker */
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303 {
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304 INT32 length;
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305 int i, ci, n, c, cc;
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306 jpeg_component_info * compptr;
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307 INPUT_VARS(cinfo);
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308
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309 if (! cinfo->marker->saw_SOF)
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310 ERREXIT(cinfo, JERR_SOS_NO_SOF);
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311
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312 INPUT_2BYTES(cinfo, length, return FALSE);
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313
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314 INPUT_BYTE(cinfo, n, return FALSE); /* Number of components */
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315
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316 TRACEMS1(cinfo, 1, JTRC_SOS, n);
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317
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318 if (length != (n * 2 + 6) || n < 1 || n > MAX_COMPS_IN_SCAN)
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319 ERREXIT(cinfo, JERR_BAD_LENGTH);
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320
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321 cinfo->comps_in_scan = n;
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322
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323 /* Collect the component-spec parameters */
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324
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325 for (i = 0; i < n; i++) {
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326 INPUT_BYTE(cinfo, cc, return FALSE);
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327 INPUT_BYTE(cinfo, c, return FALSE);
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328
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329 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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330 ci++, compptr++) {
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331 if (cc == compptr->component_id)
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332 goto id_found;
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333 }
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334
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335 ERREXIT1(cinfo, JERR_BAD_COMPONENT_ID, cc);
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336
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337 id_found:
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338
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339 cinfo->cur_comp_info[i] = compptr;
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340 compptr->dc_tbl_no = (c >> 4) & 15;
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341 compptr->ac_tbl_no = (c ) & 15;
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342
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343 TRACEMS3(cinfo, 1, JTRC_SOS_COMPONENT, cc,
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344 compptr->dc_tbl_no, compptr->ac_tbl_no);
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345 }
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346
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347 /* Collect the additional scan parameters Ss, Se, Ah/Al. */
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348 INPUT_BYTE(cinfo, c, return FALSE);
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349 cinfo->Ss = c;
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350 INPUT_BYTE(cinfo, c, return FALSE);
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351 cinfo->Se = c;
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352 INPUT_BYTE(cinfo, c, return FALSE);
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nuclear@2
|
353 cinfo->Ah = (c >> 4) & 15;
|
nuclear@2
|
354 cinfo->Al = (c ) & 15;
|
nuclear@2
|
355
|
nuclear@2
|
356 TRACEMS4(cinfo, 1, JTRC_SOS_PARAMS, cinfo->Ss, cinfo->Se,
|
nuclear@2
|
357 cinfo->Ah, cinfo->Al);
|
nuclear@2
|
358
|
nuclear@2
|
359 /* Prepare to scan data & restart markers */
|
nuclear@2
|
360 cinfo->marker->next_restart_num = 0;
|
nuclear@2
|
361
|
nuclear@2
|
362 /* Count another SOS marker */
|
nuclear@2
|
363 cinfo->input_scan_number++;
|
nuclear@2
|
364
|
nuclear@2
|
365 INPUT_SYNC(cinfo);
|
nuclear@2
|
366 return TRUE;
|
nuclear@2
|
367 }
|
nuclear@2
|
368
|
nuclear@2
|
369
|
nuclear@2
|
370 #ifdef D_ARITH_CODING_SUPPORTED
|
nuclear@2
|
371
|
nuclear@2
|
372 LOCAL(boolean)
|
nuclear@2
|
373 get_dac (j_decompress_ptr cinfo)
|
nuclear@2
|
374 /* Process a DAC marker */
|
nuclear@2
|
375 {
|
nuclear@2
|
376 INT32 length;
|
nuclear@2
|
377 int index, val;
|
nuclear@2
|
378 INPUT_VARS(cinfo);
|
nuclear@2
|
379
|
nuclear@2
|
380 INPUT_2BYTES(cinfo, length, return FALSE);
|
nuclear@2
|
381 length -= 2;
|
nuclear@2
|
382
|
nuclear@2
|
383 while (length > 0) {
|
nuclear@2
|
384 INPUT_BYTE(cinfo, index, return FALSE);
|
nuclear@2
|
385 INPUT_BYTE(cinfo, val, return FALSE);
|
nuclear@2
|
386
|
nuclear@2
|
387 length -= 2;
|
nuclear@2
|
388
|
nuclear@2
|
389 TRACEMS2(cinfo, 1, JTRC_DAC, index, val);
|
nuclear@2
|
390
|
nuclear@2
|
391 if (index < 0 || index >= (2*NUM_ARITH_TBLS))
|
nuclear@2
|
392 ERREXIT1(cinfo, JERR_DAC_INDEX, index);
|
nuclear@2
|
393
|
nuclear@2
|
394 if (index >= NUM_ARITH_TBLS) { /* define AC table */
|
nuclear@2
|
395 cinfo->arith_ac_K[index-NUM_ARITH_TBLS] = (UINT8) val;
|
nuclear@2
|
396 } else { /* define DC table */
|
nuclear@2
|
397 cinfo->arith_dc_L[index] = (UINT8) (val & 0x0F);
|
nuclear@2
|
398 cinfo->arith_dc_U[index] = (UINT8) (val >> 4);
|
nuclear@2
|
399 if (cinfo->arith_dc_L[index] > cinfo->arith_dc_U[index])
|
nuclear@2
|
400 ERREXIT1(cinfo, JERR_DAC_VALUE, val);
|
nuclear@2
|
401 }
|
nuclear@2
|
402 }
|
nuclear@2
|
403
|
nuclear@2
|
404 if (length != 0)
|
nuclear@2
|
405 ERREXIT(cinfo, JERR_BAD_LENGTH);
|
nuclear@2
|
406
|
nuclear@2
|
407 INPUT_SYNC(cinfo);
|
nuclear@2
|
408 return TRUE;
|
nuclear@2
|
409 }
|
nuclear@2
|
410
|
nuclear@2
|
411 #else /* ! D_ARITH_CODING_SUPPORTED */
|
nuclear@2
|
412
|
nuclear@2
|
413 #define get_dac(cinfo) skip_variable(cinfo)
|
nuclear@2
|
414
|
nuclear@2
|
415 #endif /* D_ARITH_CODING_SUPPORTED */
|
nuclear@2
|
416
|
nuclear@2
|
417
|
nuclear@2
|
418 LOCAL(boolean)
|
nuclear@2
|
419 get_dht (j_decompress_ptr cinfo)
|
nuclear@2
|
420 /* Process a DHT marker */
|
nuclear@2
|
421 {
|
nuclear@2
|
422 INT32 length;
|
nuclear@2
|
423 UINT8 bits[17];
|
nuclear@2
|
424 UINT8 huffval[256];
|
nuclear@2
|
425 int i, index, count;
|
nuclear@2
|
426 JHUFF_TBL **htblptr;
|
nuclear@2
|
427 INPUT_VARS(cinfo);
|
nuclear@2
|
428
|
nuclear@2
|
429 INPUT_2BYTES(cinfo, length, return FALSE);
|
nuclear@2
|
430 length -= 2;
|
nuclear@2
|
431
|
nuclear@2
|
432 while (length > 16) {
|
nuclear@2
|
433 INPUT_BYTE(cinfo, index, return FALSE);
|
nuclear@2
|
434
|
nuclear@2
|
435 TRACEMS1(cinfo, 1, JTRC_DHT, index);
|
nuclear@2
|
436
|
nuclear@2
|
437 bits[0] = 0;
|
nuclear@2
|
438 count = 0;
|
nuclear@2
|
439 for (i = 1; i <= 16; i++) {
|
nuclear@2
|
440 INPUT_BYTE(cinfo, bits[i], return FALSE);
|
nuclear@2
|
441 count += bits[i];
|
nuclear@2
|
442 }
|
nuclear@2
|
443
|
nuclear@2
|
444 length -= 1 + 16;
|
nuclear@2
|
445
|
nuclear@2
|
446 TRACEMS8(cinfo, 2, JTRC_HUFFBITS,
|
nuclear@2
|
447 bits[1], bits[2], bits[3], bits[4],
|
nuclear@2
|
448 bits[5], bits[6], bits[7], bits[8]);
|
nuclear@2
|
449 TRACEMS8(cinfo, 2, JTRC_HUFFBITS,
|
nuclear@2
|
450 bits[9], bits[10], bits[11], bits[12],
|
nuclear@2
|
451 bits[13], bits[14], bits[15], bits[16]);
|
nuclear@2
|
452
|
nuclear@2
|
453 /* Here we just do minimal validation of the counts to avoid walking
|
nuclear@2
|
454 * off the end of our table space. jdhuff.c will check more carefully.
|
nuclear@2
|
455 */
|
nuclear@2
|
456 if (count > 256 || ((INT32) count) > length)
|
nuclear@2
|
457 ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
|
nuclear@2
|
458
|
nuclear@2
|
459 for (i = 0; i < count; i++)
|
nuclear@2
|
460 INPUT_BYTE(cinfo, huffval[i], return FALSE);
|
nuclear@2
|
461
|
nuclear@2
|
462 length -= count;
|
nuclear@2
|
463
|
nuclear@2
|
464 if (index & 0x10) { /* AC table definition */
|
nuclear@2
|
465 index -= 0x10;
|
nuclear@2
|
466 htblptr = &cinfo->ac_huff_tbl_ptrs[index];
|
nuclear@2
|
467 } else { /* DC table definition */
|
nuclear@2
|
468 htblptr = &cinfo->dc_huff_tbl_ptrs[index];
|
nuclear@2
|
469 }
|
nuclear@2
|
470
|
nuclear@2
|
471 if (index < 0 || index >= NUM_HUFF_TBLS)
|
nuclear@2
|
472 ERREXIT1(cinfo, JERR_DHT_INDEX, index);
|
nuclear@2
|
473
|
nuclear@2
|
474 if (*htblptr == NULL)
|
nuclear@2
|
475 *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
|
nuclear@2
|
476
|
nuclear@2
|
477 MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));
|
nuclear@2
|
478 MEMCOPY((*htblptr)->huffval, huffval, SIZEOF((*htblptr)->huffval));
|
nuclear@2
|
479 }
|
nuclear@2
|
480
|
nuclear@2
|
481 if (length != 0)
|
nuclear@2
|
482 ERREXIT(cinfo, JERR_BAD_LENGTH);
|
nuclear@2
|
483
|
nuclear@2
|
484 INPUT_SYNC(cinfo);
|
nuclear@2
|
485 return TRUE;
|
nuclear@2
|
486 }
|
nuclear@2
|
487
|
nuclear@2
|
488
|
nuclear@2
|
489 LOCAL(boolean)
|
nuclear@2
|
490 get_dqt (j_decompress_ptr cinfo)
|
nuclear@2
|
491 /* Process a DQT marker */
|
nuclear@2
|
492 {
|
nuclear@2
|
493 INT32 length;
|
nuclear@2
|
494 int n, i, prec;
|
nuclear@2
|
495 unsigned int tmp;
|
nuclear@2
|
496 JQUANT_TBL *quant_ptr;
|
nuclear@2
|
497 INPUT_VARS(cinfo);
|
nuclear@2
|
498
|
nuclear@2
|
499 INPUT_2BYTES(cinfo, length, return FALSE);
|
nuclear@2
|
500 length -= 2;
|
nuclear@2
|
501
|
nuclear@2
|
502 while (length > 0) {
|
nuclear@2
|
503 INPUT_BYTE(cinfo, n, return FALSE);
|
nuclear@2
|
504 prec = n >> 4;
|
nuclear@2
|
505 n &= 0x0F;
|
nuclear@2
|
506
|
nuclear@2
|
507 TRACEMS2(cinfo, 1, JTRC_DQT, n, prec);
|
nuclear@2
|
508
|
nuclear@2
|
509 if (n >= NUM_QUANT_TBLS)
|
nuclear@2
|
510 ERREXIT1(cinfo, JERR_DQT_INDEX, n);
|
nuclear@2
|
511
|
nuclear@2
|
512 if (cinfo->quant_tbl_ptrs[n] == NULL)
|
nuclear@2
|
513 cinfo->quant_tbl_ptrs[n] = jpeg_alloc_quant_table((j_common_ptr) cinfo);
|
nuclear@2
|
514 quant_ptr = cinfo->quant_tbl_ptrs[n];
|
nuclear@2
|
515
|
nuclear@2
|
516 for (i = 0; i < DCTSIZE2; i++) {
|
nuclear@2
|
517 if (prec)
|
nuclear@2
|
518 INPUT_2BYTES(cinfo, tmp, return FALSE);
|
nuclear@2
|
519 else
|
nuclear@2
|
520 INPUT_BYTE(cinfo, tmp, return FALSE);
|
nuclear@2
|
521 /* We convert the zigzag-order table to natural array order. */
|
nuclear@2
|
522 quant_ptr->quantval[jpeg_natural_order[i]] = (UINT16) tmp;
|
nuclear@2
|
523 }
|
nuclear@2
|
524
|
nuclear@2
|
525 if (cinfo->err->trace_level >= 2) {
|
nuclear@2
|
526 for (i = 0; i < DCTSIZE2; i += 8) {
|
nuclear@2
|
527 TRACEMS8(cinfo, 2, JTRC_QUANTVALS,
|
nuclear@2
|
528 quant_ptr->quantval[i], quant_ptr->quantval[i+1],
|
nuclear@2
|
529 quant_ptr->quantval[i+2], quant_ptr->quantval[i+3],
|
nuclear@2
|
530 quant_ptr->quantval[i+4], quant_ptr->quantval[i+5],
|
nuclear@2
|
531 quant_ptr->quantval[i+6], quant_ptr->quantval[i+7]);
|
nuclear@2
|
532 }
|
nuclear@2
|
533 }
|
nuclear@2
|
534
|
nuclear@2
|
535 length -= DCTSIZE2+1;
|
nuclear@2
|
536 if (prec) length -= DCTSIZE2;
|
nuclear@2
|
537 }
|
nuclear@2
|
538
|
nuclear@2
|
539 if (length != 0)
|
nuclear@2
|
540 ERREXIT(cinfo, JERR_BAD_LENGTH);
|
nuclear@2
|
541
|
nuclear@2
|
542 INPUT_SYNC(cinfo);
|
nuclear@2
|
543 return TRUE;
|
nuclear@2
|
544 }
|
nuclear@2
|
545
|
nuclear@2
|
546
|
nuclear@2
|
547 LOCAL(boolean)
|
nuclear@2
|
548 get_dri (j_decompress_ptr cinfo)
|
nuclear@2
|
549 /* Process a DRI marker */
|
nuclear@2
|
550 {
|
nuclear@2
|
551 INT32 length;
|
nuclear@2
|
552 unsigned int tmp;
|
nuclear@2
|
553 INPUT_VARS(cinfo);
|
nuclear@2
|
554
|
nuclear@2
|
555 INPUT_2BYTES(cinfo, length, return FALSE);
|
nuclear@2
|
556
|
nuclear@2
|
557 if (length != 4)
|
nuclear@2
|
558 ERREXIT(cinfo, JERR_BAD_LENGTH);
|
nuclear@2
|
559
|
nuclear@2
|
560 INPUT_2BYTES(cinfo, tmp, return FALSE);
|
nuclear@2
|
561
|
nuclear@2
|
562 TRACEMS1(cinfo, 1, JTRC_DRI, tmp);
|
nuclear@2
|
563
|
nuclear@2
|
564 cinfo->restart_interval = tmp;
|
nuclear@2
|
565
|
nuclear@2
|
566 INPUT_SYNC(cinfo);
|
nuclear@2
|
567 return TRUE;
|
nuclear@2
|
568 }
|
nuclear@2
|
569
|
nuclear@2
|
570
|
nuclear@2
|
571 /*
|
nuclear@2
|
572 * Routines for processing APPn and COM markers.
|
nuclear@2
|
573 * These are either saved in memory or discarded, per application request.
|
nuclear@2
|
574 * APP0 and APP14 are specially checked to see if they are
|
nuclear@2
|
575 * JFIF and Adobe markers, respectively.
|
nuclear@2
|
576 */
|
nuclear@2
|
577
|
nuclear@2
|
578 #define APP0_DATA_LEN 14 /* Length of interesting data in APP0 */
|
nuclear@2
|
579 #define APP14_DATA_LEN 12 /* Length of interesting data in APP14 */
|
nuclear@2
|
580 #define APPN_DATA_LEN 14 /* Must be the largest of the above!! */
|
nuclear@2
|
581
|
nuclear@2
|
582
|
nuclear@2
|
583 LOCAL(void)
|
nuclear@2
|
584 examine_app0 (j_decompress_ptr cinfo, JOCTET FAR * data,
|
nuclear@2
|
585 unsigned int datalen, INT32 remaining)
|
nuclear@2
|
586 /* Examine first few bytes from an APP0.
|
nuclear@2
|
587 * Take appropriate action if it is a JFIF marker.
|
nuclear@2
|
588 * datalen is # of bytes at data[], remaining is length of rest of marker data.
|
nuclear@2
|
589 */
|
nuclear@2
|
590 {
|
nuclear@2
|
591 INT32 totallen = (INT32) datalen + remaining;
|
nuclear@2
|
592
|
nuclear@2
|
593 if (datalen >= APP0_DATA_LEN &&
|
nuclear@2
|
594 GETJOCTET(data[0]) == 0x4A &&
|
nuclear@2
|
595 GETJOCTET(data[1]) == 0x46 &&
|
nuclear@2
|
596 GETJOCTET(data[2]) == 0x49 &&
|
nuclear@2
|
597 GETJOCTET(data[3]) == 0x46 &&
|
nuclear@2
|
598 GETJOCTET(data[4]) == 0) {
|
nuclear@2
|
599 /* Found JFIF APP0 marker: save info */
|
nuclear@2
|
600 cinfo->saw_JFIF_marker = TRUE;
|
nuclear@2
|
601 cinfo->JFIF_major_version = GETJOCTET(data[5]);
|
nuclear@2
|
602 cinfo->JFIF_minor_version = GETJOCTET(data[6]);
|
nuclear@2
|
603 cinfo->density_unit = GETJOCTET(data[7]);
|
nuclear@2
|
604 cinfo->X_density = (GETJOCTET(data[8]) << 8) + GETJOCTET(data[9]);
|
nuclear@2
|
605 cinfo->Y_density = (GETJOCTET(data[10]) << 8) + GETJOCTET(data[11]);
|
nuclear@2
|
606 /* Check version.
|
nuclear@2
|
607 * Major version must be 1, anything else signals an incompatible change.
|
nuclear@2
|
608 * (We used to treat this as an error, but now it's a nonfatal warning,
|
nuclear@2
|
609 * because some bozo at Hijaak couldn't read the spec.)
|
nuclear@2
|
610 * Minor version should be 0..2, but process anyway if newer.
|
nuclear@2
|
611 */
|
nuclear@2
|
612 if (cinfo->JFIF_major_version != 1)
|
nuclear@2
|
613 WARNMS2(cinfo, JWRN_JFIF_MAJOR,
|
nuclear@2
|
614 cinfo->JFIF_major_version, cinfo->JFIF_minor_version);
|
nuclear@2
|
615 /* Generate trace messages */
|
nuclear@2
|
616 TRACEMS5(cinfo, 1, JTRC_JFIF,
|
nuclear@2
|
617 cinfo->JFIF_major_version, cinfo->JFIF_minor_version,
|
nuclear@2
|
618 cinfo->X_density, cinfo->Y_density, cinfo->density_unit);
|
nuclear@2
|
619 /* Validate thumbnail dimensions and issue appropriate messages */
|
nuclear@2
|
620 if (GETJOCTET(data[12]) | GETJOCTET(data[13]))
|
nuclear@2
|
621 TRACEMS2(cinfo, 1, JTRC_JFIF_THUMBNAIL,
|
nuclear@2
|
622 GETJOCTET(data[12]), GETJOCTET(data[13]));
|
nuclear@2
|
623 totallen -= APP0_DATA_LEN;
|
nuclear@2
|
624 if (totallen !=
|
nuclear@2
|
625 ((INT32)GETJOCTET(data[12]) * (INT32)GETJOCTET(data[13]) * (INT32) 3))
|
nuclear@2
|
626 TRACEMS1(cinfo, 1, JTRC_JFIF_BADTHUMBNAILSIZE, (int) totallen);
|
nuclear@2
|
627 } else if (datalen >= 6 &&
|
nuclear@2
|
628 GETJOCTET(data[0]) == 0x4A &&
|
nuclear@2
|
629 GETJOCTET(data[1]) == 0x46 &&
|
nuclear@2
|
630 GETJOCTET(data[2]) == 0x58 &&
|
nuclear@2
|
631 GETJOCTET(data[3]) == 0x58 &&
|
nuclear@2
|
632 GETJOCTET(data[4]) == 0) {
|
nuclear@2
|
633 /* Found JFIF "JFXX" extension APP0 marker */
|
nuclear@2
|
634 /* The library doesn't actually do anything with these,
|
nuclear@2
|
635 * but we try to produce a helpful trace message.
|
nuclear@2
|
636 */
|
nuclear@2
|
637 switch (GETJOCTET(data[5])) {
|
nuclear@2
|
638 case 0x10:
|
nuclear@2
|
639 TRACEMS1(cinfo, 1, JTRC_THUMB_JPEG, (int) totallen);
|
nuclear@2
|
640 break;
|
nuclear@2
|
641 case 0x11:
|
nuclear@2
|
642 TRACEMS1(cinfo, 1, JTRC_THUMB_PALETTE, (int) totallen);
|
nuclear@2
|
643 break;
|
nuclear@2
|
644 case 0x13:
|
nuclear@2
|
645 TRACEMS1(cinfo, 1, JTRC_THUMB_RGB, (int) totallen);
|
nuclear@2
|
646 break;
|
nuclear@2
|
647 default:
|
nuclear@2
|
648 TRACEMS2(cinfo, 1, JTRC_JFIF_EXTENSION,
|
nuclear@2
|
649 GETJOCTET(data[5]), (int) totallen);
|
nuclear@2
|
650 break;
|
nuclear@2
|
651 }
|
nuclear@2
|
652 } else {
|
nuclear@2
|
653 /* Start of APP0 does not match "JFIF" or "JFXX", or too short */
|
nuclear@2
|
654 TRACEMS1(cinfo, 1, JTRC_APP0, (int) totallen);
|
nuclear@2
|
655 }
|
nuclear@2
|
656 }
|
nuclear@2
|
657
|
nuclear@2
|
658
|
nuclear@2
|
659 LOCAL(void)
|
nuclear@2
|
660 examine_app14 (j_decompress_ptr cinfo, JOCTET FAR * data,
|
nuclear@2
|
661 unsigned int datalen, INT32 remaining)
|
nuclear@2
|
662 /* Examine first few bytes from an APP14.
|
nuclear@2
|
663 * Take appropriate action if it is an Adobe marker.
|
nuclear@2
|
664 * datalen is # of bytes at data[], remaining is length of rest of marker data.
|
nuclear@2
|
665 */
|
nuclear@2
|
666 {
|
nuclear@2
|
667 unsigned int version, flags0, flags1, transform;
|
nuclear@2
|
668
|
nuclear@2
|
669 if (datalen >= APP14_DATA_LEN &&
|
nuclear@2
|
670 GETJOCTET(data[0]) == 0x41 &&
|
nuclear@2
|
671 GETJOCTET(data[1]) == 0x64 &&
|
nuclear@2
|
672 GETJOCTET(data[2]) == 0x6F &&
|
nuclear@2
|
673 GETJOCTET(data[3]) == 0x62 &&
|
nuclear@2
|
674 GETJOCTET(data[4]) == 0x65) {
|
nuclear@2
|
675 /* Found Adobe APP14 marker */
|
nuclear@2
|
676 version = (GETJOCTET(data[5]) << 8) + GETJOCTET(data[6]);
|
nuclear@2
|
677 flags0 = (GETJOCTET(data[7]) << 8) + GETJOCTET(data[8]);
|
nuclear@2
|
678 flags1 = (GETJOCTET(data[9]) << 8) + GETJOCTET(data[10]);
|
nuclear@2
|
679 transform = GETJOCTET(data[11]);
|
nuclear@2
|
680 TRACEMS4(cinfo, 1, JTRC_ADOBE, version, flags0, flags1, transform);
|
nuclear@2
|
681 cinfo->saw_Adobe_marker = TRUE;
|
nuclear@2
|
682 cinfo->Adobe_transform = (UINT8) transform;
|
nuclear@2
|
683 } else {
|
nuclear@2
|
684 /* Start of APP14 does not match "Adobe", or too short */
|
nuclear@2
|
685 TRACEMS1(cinfo, 1, JTRC_APP14, (int) (datalen + remaining));
|
nuclear@2
|
686 }
|
nuclear@2
|
687 }
|
nuclear@2
|
688
|
nuclear@2
|
689
|
nuclear@2
|
690 METHODDEF(boolean)
|
nuclear@2
|
691 get_interesting_appn (j_decompress_ptr cinfo)
|
nuclear@2
|
692 /* Process an APP0 or APP14 marker without saving it */
|
nuclear@2
|
693 {
|
nuclear@2
|
694 INT32 length;
|
nuclear@2
|
695 JOCTET b[APPN_DATA_LEN];
|
nuclear@2
|
696 unsigned int i, numtoread;
|
nuclear@2
|
697 INPUT_VARS(cinfo);
|
nuclear@2
|
698
|
nuclear@2
|
699 INPUT_2BYTES(cinfo, length, return FALSE);
|
nuclear@2
|
700 length -= 2;
|
nuclear@2
|
701
|
nuclear@2
|
702 /* get the interesting part of the marker data */
|
nuclear@2
|
703 if (length >= APPN_DATA_LEN)
|
nuclear@2
|
704 numtoread = APPN_DATA_LEN;
|
nuclear@2
|
705 else if (length > 0)
|
nuclear@2
|
706 numtoread = (unsigned int) length;
|
nuclear@2
|
707 else
|
nuclear@2
|
708 numtoread = 0;
|
nuclear@2
|
709 for (i = 0; i < numtoread; i++)
|
nuclear@2
|
710 INPUT_BYTE(cinfo, b[i], return FALSE);
|
nuclear@2
|
711 length -= numtoread;
|
nuclear@2
|
712
|
nuclear@2
|
713 /* process it */
|
nuclear@2
|
714 switch (cinfo->unread_marker) {
|
nuclear@2
|
715 case M_APP0:
|
nuclear@2
|
716 examine_app0(cinfo, (JOCTET FAR *) b, numtoread, length);
|
nuclear@2
|
717 break;
|
nuclear@2
|
718 case M_APP14:
|
nuclear@2
|
719 examine_app14(cinfo, (JOCTET FAR *) b, numtoread, length);
|
nuclear@2
|
720 break;
|
nuclear@2
|
721 default:
|
nuclear@2
|
722 /* can't get here unless jpeg_save_markers chooses wrong processor */
|
nuclear@2
|
723 ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker);
|
nuclear@2
|
724 break;
|
nuclear@2
|
725 }
|
nuclear@2
|
726
|
nuclear@2
|
727 /* skip any remaining data -- could be lots */
|
nuclear@2
|
728 INPUT_SYNC(cinfo);
|
nuclear@2
|
729 if (length > 0)
|
nuclear@2
|
730 (*cinfo->src->skip_input_data) (cinfo, (long) length);
|
nuclear@2
|
731
|
nuclear@2
|
732 return TRUE;
|
nuclear@2
|
733 }
|
nuclear@2
|
734
|
nuclear@2
|
735
|
nuclear@2
|
736 #ifdef SAVE_MARKERS_SUPPORTED
|
nuclear@2
|
737
|
nuclear@2
|
738 METHODDEF(boolean)
|
nuclear@2
|
739 save_marker (j_decompress_ptr cinfo)
|
nuclear@2
|
740 /* Save an APPn or COM marker into the marker list */
|
nuclear@2
|
741 {
|
nuclear@2
|
742 my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
|
nuclear@2
|
743 jpeg_saved_marker_ptr cur_marker = marker->cur_marker;
|
nuclear@2
|
744 unsigned int bytes_read, data_length;
|
nuclear@2
|
745 JOCTET FAR * data;
|
nuclear@2
|
746 INT32 length = 0;
|
nuclear@2
|
747 INPUT_VARS(cinfo);
|
nuclear@2
|
748
|
nuclear@2
|
749 if (cur_marker == NULL) {
|
nuclear@2
|
750 /* begin reading a marker */
|
nuclear@2
|
751 INPUT_2BYTES(cinfo, length, return FALSE);
|
nuclear@2
|
752 length -= 2;
|
nuclear@2
|
753 if (length >= 0) { /* watch out for bogus length word */
|
nuclear@2
|
754 /* figure out how much we want to save */
|
nuclear@2
|
755 unsigned int limit;
|
nuclear@2
|
756 if (cinfo->unread_marker == (int) M_COM)
|
nuclear@2
|
757 limit = marker->length_limit_COM;
|
nuclear@2
|
758 else
|
nuclear@2
|
759 limit = marker->length_limit_APPn[cinfo->unread_marker - (int) M_APP0];
|
nuclear@2
|
760 if ((unsigned int) length < limit)
|
nuclear@2
|
761 limit = (unsigned int) length;
|
nuclear@2
|
762 /* allocate and initialize the marker item */
|
nuclear@2
|
763 cur_marker = (jpeg_saved_marker_ptr)
|
nuclear@2
|
764 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
nuclear@2
|
765 SIZEOF(struct jpeg_marker_struct) + limit);
|
nuclear@2
|
766 cur_marker->next = NULL;
|
nuclear@2
|
767 cur_marker->marker = (UINT8) cinfo->unread_marker;
|
nuclear@2
|
768 cur_marker->original_length = (unsigned int) length;
|
nuclear@2
|
769 cur_marker->data_length = limit;
|
nuclear@2
|
770 /* data area is just beyond the jpeg_marker_struct */
|
nuclear@2
|
771 data = cur_marker->data = (JOCTET FAR *) (cur_marker + 1);
|
nuclear@2
|
772 marker->cur_marker = cur_marker;
|
nuclear@2
|
773 marker->bytes_read = 0;
|
nuclear@2
|
774 bytes_read = 0;
|
nuclear@2
|
775 data_length = limit;
|
nuclear@2
|
776 } else {
|
nuclear@2
|
777 /* deal with bogus length word */
|
nuclear@2
|
778 bytes_read = data_length = 0;
|
nuclear@2
|
779 data = NULL;
|
nuclear@2
|
780 }
|
nuclear@2
|
781 } else {
|
nuclear@2
|
782 /* resume reading a marker */
|
nuclear@2
|
783 bytes_read = marker->bytes_read;
|
nuclear@2
|
784 data_length = cur_marker->data_length;
|
nuclear@2
|
785 data = cur_marker->data + bytes_read;
|
nuclear@2
|
786 }
|
nuclear@2
|
787
|
nuclear@2
|
788 while (bytes_read < data_length) {
|
nuclear@2
|
789 INPUT_SYNC(cinfo); /* move the restart point to here */
|
nuclear@2
|
790 marker->bytes_read = bytes_read;
|
nuclear@2
|
791 /* If there's not at least one byte in buffer, suspend */
|
nuclear@2
|
792 MAKE_BYTE_AVAIL(cinfo, return FALSE);
|
nuclear@2
|
793 /* Copy bytes with reasonable rapidity */
|
nuclear@2
|
794 while (bytes_read < data_length && bytes_in_buffer > 0) {
|
nuclear@2
|
795 *data++ = *next_input_byte++;
|
nuclear@2
|
796 bytes_in_buffer--;
|
nuclear@2
|
797 bytes_read++;
|
nuclear@2
|
798 }
|
nuclear@2
|
799 }
|
nuclear@2
|
800
|
nuclear@2
|
801 /* Done reading what we want to read */
|
nuclear@2
|
802 if (cur_marker != NULL) { /* will be NULL if bogus length word */
|
nuclear@2
|
803 /* Add new marker to end of list */
|
nuclear@2
|
804 if (cinfo->marker_list == NULL) {
|
nuclear@2
|
805 cinfo->marker_list = cur_marker;
|
nuclear@2
|
806 } else {
|
nuclear@2
|
807 jpeg_saved_marker_ptr prev = cinfo->marker_list;
|
nuclear@2
|
808 while (prev->next != NULL)
|
nuclear@2
|
809 prev = prev->next;
|
nuclear@2
|
810 prev->next = cur_marker;
|
nuclear@2
|
811 }
|
nuclear@2
|
812 /* Reset pointer & calc remaining data length */
|
nuclear@2
|
813 data = cur_marker->data;
|
nuclear@2
|
814 length = cur_marker->original_length - data_length;
|
nuclear@2
|
815 }
|
nuclear@2
|
816 /* Reset to initial state for next marker */
|
nuclear@2
|
817 marker->cur_marker = NULL;
|
nuclear@2
|
818
|
nuclear@2
|
819 /* Process the marker if interesting; else just make a generic trace msg */
|
nuclear@2
|
820 switch (cinfo->unread_marker) {
|
nuclear@2
|
821 case M_APP0:
|
nuclear@2
|
822 examine_app0(cinfo, data, data_length, length);
|
nuclear@2
|
823 break;
|
nuclear@2
|
824 case M_APP14:
|
nuclear@2
|
825 examine_app14(cinfo, data, data_length, length);
|
nuclear@2
|
826 break;
|
nuclear@2
|
827 default:
|
nuclear@2
|
828 TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker,
|
nuclear@2
|
829 (int) (data_length + length));
|
nuclear@2
|
830 break;
|
nuclear@2
|
831 }
|
nuclear@2
|
832
|
nuclear@2
|
833 /* skip any remaining data -- could be lots */
|
nuclear@2
|
834 INPUT_SYNC(cinfo); /* do before skip_input_data */
|
nuclear@2
|
835 if (length > 0)
|
nuclear@2
|
836 (*cinfo->src->skip_input_data) (cinfo, (long) length);
|
nuclear@2
|
837
|
nuclear@2
|
838 return TRUE;
|
nuclear@2
|
839 }
|
nuclear@2
|
840
|
nuclear@2
|
841 #endif /* SAVE_MARKERS_SUPPORTED */
|
nuclear@2
|
842
|
nuclear@2
|
843
|
nuclear@2
|
844 METHODDEF(boolean)
|
nuclear@2
|
845 skip_variable (j_decompress_ptr cinfo)
|
nuclear@2
|
846 /* Skip over an unknown or uninteresting variable-length marker */
|
nuclear@2
|
847 {
|
nuclear@2
|
848 INT32 length;
|
nuclear@2
|
849 INPUT_VARS(cinfo);
|
nuclear@2
|
850
|
nuclear@2
|
851 INPUT_2BYTES(cinfo, length, return FALSE);
|
nuclear@2
|
852 length -= 2;
|
nuclear@2
|
853
|
nuclear@2
|
854 TRACEMS2(cinfo, 1, JTRC_MISC_MARKER, cinfo->unread_marker, (int) length);
|
nuclear@2
|
855
|
nuclear@2
|
856 INPUT_SYNC(cinfo); /* do before skip_input_data */
|
nuclear@2
|
857 if (length > 0)
|
nuclear@2
|
858 (*cinfo->src->skip_input_data) (cinfo, (long) length);
|
nuclear@2
|
859
|
nuclear@2
|
860 return TRUE;
|
nuclear@2
|
861 }
|
nuclear@2
|
862
|
nuclear@2
|
863
|
nuclear@2
|
864 /*
|
nuclear@2
|
865 * Find the next JPEG marker, save it in cinfo->unread_marker.
|
nuclear@2
|
866 * Returns FALSE if had to suspend before reaching a marker;
|
nuclear@2
|
867 * in that case cinfo->unread_marker is unchanged.
|
nuclear@2
|
868 *
|
nuclear@2
|
869 * Note that the result might not be a valid marker code,
|
nuclear@2
|
870 * but it will never be 0 or FF.
|
nuclear@2
|
871 */
|
nuclear@2
|
872
|
nuclear@2
|
873 LOCAL(boolean)
|
nuclear@2
|
874 next_marker (j_decompress_ptr cinfo)
|
nuclear@2
|
875 {
|
nuclear@2
|
876 int c;
|
nuclear@2
|
877 INPUT_VARS(cinfo);
|
nuclear@2
|
878
|
nuclear@2
|
879 for (;;) {
|
nuclear@2
|
880 INPUT_BYTE(cinfo, c, return FALSE);
|
nuclear@2
|
881 /* Skip any non-FF bytes.
|
nuclear@2
|
882 * This may look a bit inefficient, but it will not occur in a valid file.
|
nuclear@2
|
883 * We sync after each discarded byte so that a suspending data source
|
nuclear@2
|
884 * can discard the byte from its buffer.
|
nuclear@2
|
885 */
|
nuclear@2
|
886 while (c != 0xFF) {
|
nuclear@2
|
887 cinfo->marker->discarded_bytes++;
|
nuclear@2
|
888 INPUT_SYNC(cinfo);
|
nuclear@2
|
889 INPUT_BYTE(cinfo, c, return FALSE);
|
nuclear@2
|
890 }
|
nuclear@2
|
891 /* This loop swallows any duplicate FF bytes. Extra FFs are legal as
|
nuclear@2
|
892 * pad bytes, so don't count them in discarded_bytes. We assume there
|
nuclear@2
|
893 * will not be so many consecutive FF bytes as to overflow a suspending
|
nuclear@2
|
894 * data source's input buffer.
|
nuclear@2
|
895 */
|
nuclear@2
|
896 do {
|
nuclear@2
|
897 INPUT_BYTE(cinfo, c, return FALSE);
|
nuclear@2
|
898 } while (c == 0xFF);
|
nuclear@2
|
899 if (c != 0)
|
nuclear@2
|
900 break; /* found a valid marker, exit loop */
|
nuclear@2
|
901 /* Reach here if we found a stuffed-zero data sequence (FF/00).
|
nuclear@2
|
902 * Discard it and loop back to try again.
|
nuclear@2
|
903 */
|
nuclear@2
|
904 cinfo->marker->discarded_bytes += 2;
|
nuclear@2
|
905 INPUT_SYNC(cinfo);
|
nuclear@2
|
906 }
|
nuclear@2
|
907
|
nuclear@2
|
908 if (cinfo->marker->discarded_bytes != 0) {
|
nuclear@2
|
909 WARNMS2(cinfo, JWRN_EXTRANEOUS_DATA, cinfo->marker->discarded_bytes, c);
|
nuclear@2
|
910 cinfo->marker->discarded_bytes = 0;
|
nuclear@2
|
911 }
|
nuclear@2
|
912
|
nuclear@2
|
913 cinfo->unread_marker = c;
|
nuclear@2
|
914
|
nuclear@2
|
915 INPUT_SYNC(cinfo);
|
nuclear@2
|
916 return TRUE;
|
nuclear@2
|
917 }
|
nuclear@2
|
918
|
nuclear@2
|
919
|
nuclear@2
|
920 LOCAL(boolean)
|
nuclear@2
|
921 first_marker (j_decompress_ptr cinfo)
|
nuclear@2
|
922 /* Like next_marker, but used to obtain the initial SOI marker. */
|
nuclear@2
|
923 /* For this marker, we do not allow preceding garbage or fill; otherwise,
|
nuclear@2
|
924 * we might well scan an entire input file before realizing it ain't JPEG.
|
nuclear@2
|
925 * If an application wants to process non-JFIF files, it must seek to the
|
nuclear@2
|
926 * SOI before calling the JPEG library.
|
nuclear@2
|
927 */
|
nuclear@2
|
928 {
|
nuclear@2
|
929 int c, c2;
|
nuclear@2
|
930 INPUT_VARS(cinfo);
|
nuclear@2
|
931
|
nuclear@2
|
932 INPUT_BYTE(cinfo, c, return FALSE);
|
nuclear@2
|
933 INPUT_BYTE(cinfo, c2, return FALSE);
|
nuclear@2
|
934 if (c != 0xFF || c2 != (int) M_SOI)
|
nuclear@2
|
935 ERREXIT2(cinfo, JERR_NO_SOI, c, c2);
|
nuclear@2
|
936
|
nuclear@2
|
937 cinfo->unread_marker = c2;
|
nuclear@2
|
938
|
nuclear@2
|
939 INPUT_SYNC(cinfo);
|
nuclear@2
|
940 return TRUE;
|
nuclear@2
|
941 }
|
nuclear@2
|
942
|
nuclear@2
|
943
|
nuclear@2
|
944 /*
|
nuclear@2
|
945 * Read markers until SOS or EOI.
|
nuclear@2
|
946 *
|
nuclear@2
|
947 * Returns same codes as are defined for jpeg_consume_input:
|
nuclear@2
|
948 * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
|
nuclear@2
|
949 */
|
nuclear@2
|
950
|
nuclear@2
|
951 METHODDEF(int)
|
nuclear@2
|
952 read_markers (j_decompress_ptr cinfo)
|
nuclear@2
|
953 {
|
nuclear@2
|
954 /* Outer loop repeats once for each marker. */
|
nuclear@2
|
955 for (;;) {
|
nuclear@2
|
956 /* Collect the marker proper, unless we already did. */
|
nuclear@2
|
957 /* NB: first_marker() enforces the requirement that SOI appear first. */
|
nuclear@2
|
958 if (cinfo->unread_marker == 0) {
|
nuclear@2
|
959 if (! cinfo->marker->saw_SOI) {
|
nuclear@2
|
960 if (! first_marker(cinfo))
|
nuclear@2
|
961 return JPEG_SUSPENDED;
|
nuclear@2
|
962 } else {
|
nuclear@2
|
963 if (! next_marker(cinfo))
|
nuclear@2
|
964 return JPEG_SUSPENDED;
|
nuclear@2
|
965 }
|
nuclear@2
|
966 }
|
nuclear@2
|
967 /* At this point cinfo->unread_marker contains the marker code and the
|
nuclear@2
|
968 * input point is just past the marker proper, but before any parameters.
|
nuclear@2
|
969 * A suspension will cause us to return with this state still true.
|
nuclear@2
|
970 */
|
nuclear@2
|
971 switch (cinfo->unread_marker) {
|
nuclear@2
|
972 case M_SOI:
|
nuclear@2
|
973 if (! get_soi(cinfo))
|
nuclear@2
|
974 return JPEG_SUSPENDED;
|
nuclear@2
|
975 break;
|
nuclear@2
|
976
|
nuclear@2
|
977 case M_SOF0: /* Baseline */
|
nuclear@2
|
978 case M_SOF1: /* Extended sequential, Huffman */
|
nuclear@2
|
979 if (! get_sof(cinfo, FALSE, FALSE))
|
nuclear@2
|
980 return JPEG_SUSPENDED;
|
nuclear@2
|
981 break;
|
nuclear@2
|
982
|
nuclear@2
|
983 case M_SOF2: /* Progressive, Huffman */
|
nuclear@2
|
984 if (! get_sof(cinfo, TRUE, FALSE))
|
nuclear@2
|
985 return JPEG_SUSPENDED;
|
nuclear@2
|
986 break;
|
nuclear@2
|
987
|
nuclear@2
|
988 case M_SOF9: /* Extended sequential, arithmetic */
|
nuclear@2
|
989 if (! get_sof(cinfo, FALSE, TRUE))
|
nuclear@2
|
990 return JPEG_SUSPENDED;
|
nuclear@2
|
991 break;
|
nuclear@2
|
992
|
nuclear@2
|
993 case M_SOF10: /* Progressive, arithmetic */
|
nuclear@2
|
994 if (! get_sof(cinfo, TRUE, TRUE))
|
nuclear@2
|
995 return JPEG_SUSPENDED;
|
nuclear@2
|
996 break;
|
nuclear@2
|
997
|
nuclear@2
|
998 /* Currently unsupported SOFn types */
|
nuclear@2
|
999 case M_SOF3: /* Lossless, Huffman */
|
nuclear@2
|
1000 case M_SOF5: /* Differential sequential, Huffman */
|
nuclear@2
|
1001 case M_SOF6: /* Differential progressive, Huffman */
|
nuclear@2
|
1002 case M_SOF7: /* Differential lossless, Huffman */
|
nuclear@2
|
1003 case M_JPG: /* Reserved for JPEG extensions */
|
nuclear@2
|
1004 case M_SOF11: /* Lossless, arithmetic */
|
nuclear@2
|
1005 case M_SOF13: /* Differential sequential, arithmetic */
|
nuclear@2
|
1006 case M_SOF14: /* Differential progressive, arithmetic */
|
nuclear@2
|
1007 case M_SOF15: /* Differential lossless, arithmetic */
|
nuclear@2
|
1008 ERREXIT1(cinfo, JERR_SOF_UNSUPPORTED, cinfo->unread_marker);
|
nuclear@2
|
1009 break;
|
nuclear@2
|
1010
|
nuclear@2
|
1011 case M_SOS:
|
nuclear@2
|
1012 if (! get_sos(cinfo))
|
nuclear@2
|
1013 return JPEG_SUSPENDED;
|
nuclear@2
|
1014 cinfo->unread_marker = 0; /* processed the marker */
|
nuclear@2
|
1015 return JPEG_REACHED_SOS;
|
nuclear@2
|
1016
|
nuclear@2
|
1017 case M_EOI:
|
nuclear@2
|
1018 TRACEMS(cinfo, 1, JTRC_EOI);
|
nuclear@2
|
1019 cinfo->unread_marker = 0; /* processed the marker */
|
nuclear@2
|
1020 return JPEG_REACHED_EOI;
|
nuclear@2
|
1021
|
nuclear@2
|
1022 case M_DAC:
|
nuclear@2
|
1023 if (! get_dac(cinfo))
|
nuclear@2
|
1024 return JPEG_SUSPENDED;
|
nuclear@2
|
1025 break;
|
nuclear@2
|
1026
|
nuclear@2
|
1027 case M_DHT:
|
nuclear@2
|
1028 if (! get_dht(cinfo))
|
nuclear@2
|
1029 return JPEG_SUSPENDED;
|
nuclear@2
|
1030 break;
|
nuclear@2
|
1031
|
nuclear@2
|
1032 case M_DQT:
|
nuclear@2
|
1033 if (! get_dqt(cinfo))
|
nuclear@2
|
1034 return JPEG_SUSPENDED;
|
nuclear@2
|
1035 break;
|
nuclear@2
|
1036
|
nuclear@2
|
1037 case M_DRI:
|
nuclear@2
|
1038 if (! get_dri(cinfo))
|
nuclear@2
|
1039 return JPEG_SUSPENDED;
|
nuclear@2
|
1040 break;
|
nuclear@2
|
1041
|
nuclear@2
|
1042 case M_APP0:
|
nuclear@2
|
1043 case M_APP1:
|
nuclear@2
|
1044 case M_APP2:
|
nuclear@2
|
1045 case M_APP3:
|
nuclear@2
|
1046 case M_APP4:
|
nuclear@2
|
1047 case M_APP5:
|
nuclear@2
|
1048 case M_APP6:
|
nuclear@2
|
1049 case M_APP7:
|
nuclear@2
|
1050 case M_APP8:
|
nuclear@2
|
1051 case M_APP9:
|
nuclear@2
|
1052 case M_APP10:
|
nuclear@2
|
1053 case M_APP11:
|
nuclear@2
|
1054 case M_APP12:
|
nuclear@2
|
1055 case M_APP13:
|
nuclear@2
|
1056 case M_APP14:
|
nuclear@2
|
1057 case M_APP15:
|
nuclear@2
|
1058 if (! (*((my_marker_ptr) cinfo->marker)->process_APPn[
|
nuclear@2
|
1059 cinfo->unread_marker - (int) M_APP0]) (cinfo))
|
nuclear@2
|
1060 return JPEG_SUSPENDED;
|
nuclear@2
|
1061 break;
|
nuclear@2
|
1062
|
nuclear@2
|
1063 case M_COM:
|
nuclear@2
|
1064 if (! (*((my_marker_ptr) cinfo->marker)->process_COM) (cinfo))
|
nuclear@2
|
1065 return JPEG_SUSPENDED;
|
nuclear@2
|
1066 break;
|
nuclear@2
|
1067
|
nuclear@2
|
1068 case M_RST0: /* these are all parameterless */
|
nuclear@2
|
1069 case M_RST1:
|
nuclear@2
|
1070 case M_RST2:
|
nuclear@2
|
1071 case M_RST3:
|
nuclear@2
|
1072 case M_RST4:
|
nuclear@2
|
1073 case M_RST5:
|
nuclear@2
|
1074 case M_RST6:
|
nuclear@2
|
1075 case M_RST7:
|
nuclear@2
|
1076 case M_TEM:
|
nuclear@2
|
1077 TRACEMS1(cinfo, 1, JTRC_PARMLESS_MARKER, cinfo->unread_marker);
|
nuclear@2
|
1078 break;
|
nuclear@2
|
1079
|
nuclear@2
|
1080 case M_DNL: /* Ignore DNL ... perhaps the wrong thing */
|
nuclear@2
|
1081 if (! skip_variable(cinfo))
|
nuclear@2
|
1082 return JPEG_SUSPENDED;
|
nuclear@2
|
1083 break;
|
nuclear@2
|
1084
|
nuclear@2
|
1085 default: /* must be DHP, EXP, JPGn, or RESn */
|
nuclear@2
|
1086 /* For now, we treat the reserved markers as fatal errors since they are
|
nuclear@2
|
1087 * likely to be used to signal incompatible JPEG Part 3 extensions.
|
nuclear@2
|
1088 * Once the JPEG 3 version-number marker is well defined, this code
|
nuclear@2
|
1089 * ought to change!
|
nuclear@2
|
1090 */
|
nuclear@2
|
1091 ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, cinfo->unread_marker);
|
nuclear@2
|
1092 break;
|
nuclear@2
|
1093 }
|
nuclear@2
|
1094 /* Successfully processed marker, so reset state variable */
|
nuclear@2
|
1095 cinfo->unread_marker = 0;
|
nuclear@2
|
1096 } /* end loop */
|
nuclear@2
|
1097 }
|
nuclear@2
|
1098
|
nuclear@2
|
1099
|
nuclear@2
|
1100 /*
|
nuclear@2
|
1101 * Read a restart marker, which is expected to appear next in the datastream;
|
nuclear@2
|
1102 * if the marker is not there, take appropriate recovery action.
|
nuclear@2
|
1103 * Returns FALSE if suspension is required.
|
nuclear@2
|
1104 *
|
nuclear@2
|
1105 * This is called by the entropy decoder after it has read an appropriate
|
nuclear@2
|
1106 * number of MCUs. cinfo->unread_marker may be nonzero if the entropy decoder
|
nuclear@2
|
1107 * has already read a marker from the data source. Under normal conditions
|
nuclear@2
|
1108 * cinfo->unread_marker will be reset to 0 before returning; if not reset,
|
nuclear@2
|
1109 * it holds a marker which the decoder will be unable to read past.
|
nuclear@2
|
1110 */
|
nuclear@2
|
1111
|
nuclear@2
|
1112 METHODDEF(boolean)
|
nuclear@2
|
1113 read_restart_marker (j_decompress_ptr cinfo)
|
nuclear@2
|
1114 {
|
nuclear@2
|
1115 /* Obtain a marker unless we already did. */
|
nuclear@2
|
1116 /* Note that next_marker will complain if it skips any data. */
|
nuclear@2
|
1117 if (cinfo->unread_marker == 0) {
|
nuclear@2
|
1118 if (! next_marker(cinfo))
|
nuclear@2
|
1119 return FALSE;
|
nuclear@2
|
1120 }
|
nuclear@2
|
1121
|
nuclear@2
|
1122 if (cinfo->unread_marker ==
|
nuclear@2
|
1123 ((int) M_RST0 + cinfo->marker->next_restart_num)) {
|
nuclear@2
|
1124 /* Normal case --- swallow the marker and let entropy decoder continue */
|
nuclear@2
|
1125 TRACEMS1(cinfo, 3, JTRC_RST, cinfo->marker->next_restart_num);
|
nuclear@2
|
1126 cinfo->unread_marker = 0;
|
nuclear@2
|
1127 } else {
|
nuclear@2
|
1128 /* Uh-oh, the restart markers have been messed up. */
|
nuclear@2
|
1129 /* Let the data source manager determine how to resync. */
|
nuclear@2
|
1130 if (! (*cinfo->src->resync_to_restart) (cinfo,
|
nuclear@2
|
1131 cinfo->marker->next_restart_num))
|
nuclear@2
|
1132 return FALSE;
|
nuclear@2
|
1133 }
|
nuclear@2
|
1134
|
nuclear@2
|
1135 /* Update next-restart state */
|
nuclear@2
|
1136 cinfo->marker->next_restart_num = (cinfo->marker->next_restart_num + 1) & 7;
|
nuclear@2
|
1137
|
nuclear@2
|
1138 return TRUE;
|
nuclear@2
|
1139 }
|
nuclear@2
|
1140
|
nuclear@2
|
1141
|
nuclear@2
|
1142 /*
|
nuclear@2
|
1143 * This is the default resync_to_restart method for data source managers
|
nuclear@2
|
1144 * to use if they don't have any better approach. Some data source managers
|
nuclear@2
|
1145 * may be able to back up, or may have additional knowledge about the data
|
nuclear@2
|
1146 * which permits a more intelligent recovery strategy; such managers would
|
nuclear@2
|
1147 * presumably supply their own resync method.
|
nuclear@2
|
1148 *
|
nuclear@2
|
1149 * read_restart_marker calls resync_to_restart if it finds a marker other than
|
nuclear@2
|
1150 * the restart marker it was expecting. (This code is *not* used unless
|
nuclear@2
|
1151 * a nonzero restart interval has been declared.) cinfo->unread_marker is
|
nuclear@2
|
1152 * the marker code actually found (might be anything, except 0 or FF).
|
nuclear@2
|
1153 * The desired restart marker number (0..7) is passed as a parameter.
|
nuclear@2
|
1154 * This routine is supposed to apply whatever error recovery strategy seems
|
nuclear@2
|
1155 * appropriate in order to position the input stream to the next data segment.
|
nuclear@2
|
1156 * Note that cinfo->unread_marker is treated as a marker appearing before
|
nuclear@2
|
1157 * the current data-source input point; usually it should be reset to zero
|
nuclear@2
|
1158 * before returning.
|
nuclear@2
|
1159 * Returns FALSE if suspension is required.
|
nuclear@2
|
1160 *
|
nuclear@2
|
1161 * This implementation is substantially constrained by wanting to treat the
|
nuclear@2
|
1162 * input as a data stream; this means we can't back up. Therefore, we have
|
nuclear@2
|
1163 * only the following actions to work with:
|
nuclear@2
|
1164 * 1. Simply discard the marker and let the entropy decoder resume at next
|
nuclear@2
|
1165 * byte of file.
|
nuclear@2
|
1166 * 2. Read forward until we find another marker, discarding intervening
|
nuclear@2
|
1167 * data. (In theory we could look ahead within the current bufferload,
|
nuclear@2
|
1168 * without having to discard data if we don't find the desired marker.
|
nuclear@2
|
1169 * This idea is not implemented here, in part because it makes behavior
|
nuclear@2
|
1170 * dependent on buffer size and chance buffer-boundary positions.)
|
nuclear@2
|
1171 * 3. Leave the marker unread (by failing to zero cinfo->unread_marker).
|
nuclear@2
|
1172 * This will cause the entropy decoder to process an empty data segment,
|
nuclear@2
|
1173 * inserting dummy zeroes, and then we will reprocess the marker.
|
nuclear@2
|
1174 *
|
nuclear@2
|
1175 * #2 is appropriate if we think the desired marker lies ahead, while #3 is
|
nuclear@2
|
1176 * appropriate if the found marker is a future restart marker (indicating
|
nuclear@2
|
1177 * that we have missed the desired restart marker, probably because it got
|
nuclear@2
|
1178 * corrupted).
|
nuclear@2
|
1179 * We apply #2 or #3 if the found marker is a restart marker no more than
|
nuclear@2
|
1180 * two counts behind or ahead of the expected one. We also apply #2 if the
|
nuclear@2
|
1181 * found marker is not a legal JPEG marker code (it's certainly bogus data).
|
nuclear@2
|
1182 * If the found marker is a restart marker more than 2 counts away, we do #1
|
nuclear@2
|
1183 * (too much risk that the marker is erroneous; with luck we will be able to
|
nuclear@2
|
1184 * resync at some future point).
|
nuclear@2
|
1185 * For any valid non-restart JPEG marker, we apply #3. This keeps us from
|
nuclear@2
|
1186 * overrunning the end of a scan. An implementation limited to single-scan
|
nuclear@2
|
1187 * files might find it better to apply #2 for markers other than EOI, since
|
nuclear@2
|
1188 * any other marker would have to be bogus data in that case.
|
nuclear@2
|
1189 */
|
nuclear@2
|
1190
|
nuclear@2
|
1191 GLOBAL(boolean)
|
nuclear@2
|
1192 jpeg_resync_to_restart (j_decompress_ptr cinfo, int desired)
|
nuclear@2
|
1193 {
|
nuclear@2
|
1194 int marker = cinfo->unread_marker;
|
nuclear@2
|
1195 int action = 1;
|
nuclear@2
|
1196
|
nuclear@2
|
1197 /* Always put up a warning. */
|
nuclear@2
|
1198 WARNMS2(cinfo, JWRN_MUST_RESYNC, marker, desired);
|
nuclear@2
|
1199
|
nuclear@2
|
1200 /* Outer loop handles repeated decision after scanning forward. */
|
nuclear@2
|
1201 for (;;) {
|
nuclear@2
|
1202 if (marker < (int) M_SOF0)
|
nuclear@2
|
1203 action = 2; /* invalid marker */
|
nuclear@2
|
1204 else if (marker < (int) M_RST0 || marker > (int) M_RST7)
|
nuclear@2
|
1205 action = 3; /* valid non-restart marker */
|
nuclear@2
|
1206 else {
|
nuclear@2
|
1207 if (marker == ((int) M_RST0 + ((desired+1) & 7)) ||
|
nuclear@2
|
1208 marker == ((int) M_RST0 + ((desired+2) & 7)))
|
nuclear@2
|
1209 action = 3; /* one of the next two expected restarts */
|
nuclear@2
|
1210 else if (marker == ((int) M_RST0 + ((desired-1) & 7)) ||
|
nuclear@2
|
1211 marker == ((int) M_RST0 + ((desired-2) & 7)))
|
nuclear@2
|
1212 action = 2; /* a prior restart, so advance */
|
nuclear@2
|
1213 else
|
nuclear@2
|
1214 action = 1; /* desired restart or too far away */
|
nuclear@2
|
1215 }
|
nuclear@2
|
1216 TRACEMS2(cinfo, 4, JTRC_RECOVERY_ACTION, marker, action);
|
nuclear@2
|
1217 switch (action) {
|
nuclear@2
|
1218 case 1:
|
nuclear@2
|
1219 /* Discard marker and let entropy decoder resume processing. */
|
nuclear@2
|
1220 cinfo->unread_marker = 0;
|
nuclear@2
|
1221 return TRUE;
|
nuclear@2
|
1222 case 2:
|
nuclear@2
|
1223 /* Scan to the next marker, and repeat the decision loop. */
|
nuclear@2
|
1224 if (! next_marker(cinfo))
|
nuclear@2
|
1225 return FALSE;
|
nuclear@2
|
1226 marker = cinfo->unread_marker;
|
nuclear@2
|
1227 break;
|
nuclear@2
|
1228 case 3:
|
nuclear@2
|
1229 /* Return without advancing past this marker. */
|
nuclear@2
|
1230 /* Entropy decoder will be forced to process an empty segment. */
|
nuclear@2
|
1231 return TRUE;
|
nuclear@2
|
1232 }
|
nuclear@2
|
1233 } /* end loop */
|
nuclear@2
|
1234 }
|
nuclear@2
|
1235
|
nuclear@2
|
1236
|
nuclear@2
|
1237 /*
|
nuclear@2
|
1238 * Reset marker processing state to begin a fresh datastream.
|
nuclear@2
|
1239 */
|
nuclear@2
|
1240
|
nuclear@2
|
1241 METHODDEF(void)
|
nuclear@2
|
1242 reset_marker_reader (j_decompress_ptr cinfo)
|
nuclear@2
|
1243 {
|
nuclear@2
|
1244 my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
|
nuclear@2
|
1245
|
nuclear@2
|
1246 cinfo->comp_info = NULL; /* until allocated by get_sof */
|
nuclear@2
|
1247 cinfo->input_scan_number = 0; /* no SOS seen yet */
|
nuclear@2
|
1248 cinfo->unread_marker = 0; /* no pending marker */
|
nuclear@2
|
1249 marker->pub.saw_SOI = FALSE; /* set internal state too */
|
nuclear@2
|
1250 marker->pub.saw_SOF = FALSE;
|
nuclear@2
|
1251 marker->pub.discarded_bytes = 0;
|
nuclear@2
|
1252 marker->cur_marker = NULL;
|
nuclear@2
|
1253 }
|
nuclear@2
|
1254
|
nuclear@2
|
1255
|
nuclear@2
|
1256 /*
|
nuclear@2
|
1257 * Initialize the marker reader module.
|
nuclear@2
|
1258 * This is called only once, when the decompression object is created.
|
nuclear@2
|
1259 */
|
nuclear@2
|
1260
|
nuclear@2
|
1261 GLOBAL(void)
|
nuclear@2
|
1262 jinit_marker_reader (j_decompress_ptr cinfo)
|
nuclear@2
|
1263 {
|
nuclear@2
|
1264 my_marker_ptr marker;
|
nuclear@2
|
1265 int i;
|
nuclear@2
|
1266
|
nuclear@2
|
1267 /* Create subobject in permanent pool */
|
nuclear@2
|
1268 marker = (my_marker_ptr)
|
nuclear@2
|
1269 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
|
nuclear@2
|
1270 SIZEOF(my_marker_reader));
|
nuclear@2
|
1271 cinfo->marker = (struct jpeg_marker_reader *) marker;
|
nuclear@2
|
1272 /* Initialize public method pointers */
|
nuclear@2
|
1273 marker->pub.reset_marker_reader = reset_marker_reader;
|
nuclear@2
|
1274 marker->pub.read_markers = read_markers;
|
nuclear@2
|
1275 marker->pub.read_restart_marker = read_restart_marker;
|
nuclear@2
|
1276 /* Initialize COM/APPn processing.
|
nuclear@2
|
1277 * By default, we examine and then discard APP0 and APP14,
|
nuclear@2
|
1278 * but simply discard COM and all other APPn.
|
nuclear@2
|
1279 */
|
nuclear@2
|
1280 marker->process_COM = skip_variable;
|
nuclear@2
|
1281 marker->length_limit_COM = 0;
|
nuclear@2
|
1282 for (i = 0; i < 16; i++) {
|
nuclear@2
|
1283 marker->process_APPn[i] = skip_variable;
|
nuclear@2
|
1284 marker->length_limit_APPn[i] = 0;
|
nuclear@2
|
1285 }
|
nuclear@2
|
1286 marker->process_APPn[0] = get_interesting_appn;
|
nuclear@2
|
1287 marker->process_APPn[14] = get_interesting_appn;
|
nuclear@2
|
1288 /* Reset marker processing state */
|
nuclear@2
|
1289 reset_marker_reader(cinfo);
|
nuclear@2
|
1290 }
|
nuclear@2
|
1291
|
nuclear@2
|
1292
|
nuclear@2
|
1293 /*
|
nuclear@2
|
1294 * Control saving of COM and APPn markers into marker_list.
|
nuclear@2
|
1295 */
|
nuclear@2
|
1296
|
nuclear@2
|
1297 #ifdef SAVE_MARKERS_SUPPORTED
|
nuclear@2
|
1298
|
nuclear@2
|
1299 GLOBAL(void)
|
nuclear@2
|
1300 jpeg_save_markers (j_decompress_ptr cinfo, int marker_code,
|
nuclear@2
|
1301 unsigned int length_limit)
|
nuclear@2
|
1302 {
|
nuclear@2
|
1303 my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
|
nuclear@2
|
1304 long maxlength;
|
nuclear@2
|
1305 jpeg_marker_parser_method processor;
|
nuclear@2
|
1306
|
nuclear@2
|
1307 /* Length limit mustn't be larger than what we can allocate
|
nuclear@2
|
1308 * (should only be a concern in a 16-bit environment).
|
nuclear@2
|
1309 */
|
nuclear@2
|
1310 maxlength = cinfo->mem->max_alloc_chunk - SIZEOF(struct jpeg_marker_struct);
|
nuclear@2
|
1311 if (((long) length_limit) > maxlength)
|
nuclear@2
|
1312 length_limit = (unsigned int) maxlength;
|
nuclear@2
|
1313
|
nuclear@2
|
1314 /* Choose processor routine to use.
|
nuclear@2
|
1315 * APP0/APP14 have special requirements.
|
nuclear@2
|
1316 */
|
nuclear@2
|
1317 if (length_limit) {
|
nuclear@2
|
1318 processor = save_marker;
|
nuclear@2
|
1319 /* If saving APP0/APP14, save at least enough for our internal use. */
|
nuclear@2
|
1320 if (marker_code == (int) M_APP0 && length_limit < APP0_DATA_LEN)
|
nuclear@2
|
1321 length_limit = APP0_DATA_LEN;
|
nuclear@2
|
1322 else if (marker_code == (int) M_APP14 && length_limit < APP14_DATA_LEN)
|
nuclear@2
|
1323 length_limit = APP14_DATA_LEN;
|
nuclear@2
|
1324 } else {
|
nuclear@2
|
1325 processor = skip_variable;
|
nuclear@2
|
1326 /* If discarding APP0/APP14, use our regular on-the-fly processor. */
|
nuclear@2
|
1327 if (marker_code == (int) M_APP0 || marker_code == (int) M_APP14)
|
nuclear@2
|
1328 processor = get_interesting_appn;
|
nuclear@2
|
1329 }
|
nuclear@2
|
1330
|
nuclear@2
|
1331 if (marker_code == (int) M_COM) {
|
nuclear@2
|
1332 marker->process_COM = processor;
|
nuclear@2
|
1333 marker->length_limit_COM = length_limit;
|
nuclear@2
|
1334 } else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15) {
|
nuclear@2
|
1335 marker->process_APPn[marker_code - (int) M_APP0] = processor;
|
nuclear@2
|
1336 marker->length_limit_APPn[marker_code - (int) M_APP0] = length_limit;
|
nuclear@2
|
1337 } else
|
nuclear@2
|
1338 ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);
|
nuclear@2
|
1339 }
|
nuclear@2
|
1340
|
nuclear@2
|
1341 #endif /* SAVE_MARKERS_SUPPORTED */
|
nuclear@2
|
1342
|
nuclear@2
|
1343
|
nuclear@2
|
1344 /*
|
nuclear@2
|
1345 * Install a special processing method for COM or APPn markers.
|
nuclear@2
|
1346 */
|
nuclear@2
|
1347
|
nuclear@2
|
1348 GLOBAL(void)
|
nuclear@2
|
1349 jpeg_set_marker_processor (j_decompress_ptr cinfo, int marker_code,
|
nuclear@2
|
1350 jpeg_marker_parser_method routine)
|
nuclear@2
|
1351 {
|
nuclear@2
|
1352 my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
|
nuclear@2
|
1353
|
nuclear@2
|
1354 if (marker_code == (int) M_COM)
|
nuclear@2
|
1355 marker->process_COM = routine;
|
nuclear@2
|
1356 else if (marker_code >= (int) M_APP0 && marker_code <= (int) M_APP15)
|
nuclear@2
|
1357 marker->process_APPn[marker_code - (int) M_APP0] = routine;
|
nuclear@2
|
1358 else
|
nuclear@2
|
1359 ERREXIT1(cinfo, JERR_UNKNOWN_MARKER, marker_code);
|
nuclear@2
|
1360 }
|