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5 <title>TB9.2 Example Applications: examples/PIPS/antiword/src/png2eps.c Source File</title> |
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11 <h1>examples/PIPS/antiword/src/png2eps.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span> |
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12 <a name="l00002"></a>00002 <span class="comment"> * png2eps.c</span> |
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13 <a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 2000-2002 A.J. van Os; Released under GPL</span> |
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14 <a name="l00004"></a>00004 <span class="comment"> *</span> |
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15 <a name="l00005"></a>00005 <span class="comment"> * Description:</span> |
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16 <a name="l00006"></a>00006 <span class="comment"> * Functions to translate png images into eps</span> |
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17 <a name="l00007"></a>00007 <span class="comment"> *</span> |
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18 <a name="l00008"></a>00008 <span class="comment"> */</span> |
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19 <a name="l00009"></a>00009 |
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20 <a name="l00010"></a>00010 <span class="preprocessor">#include <stdio.h></span> |
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21 <a name="l00011"></a>00011 <span class="preprocessor">#include <ctype.h></span> |
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22 <a name="l00012"></a>00012 <span class="preprocessor">#include "antiword.h"</span> |
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23 <a name="l00013"></a>00013 |
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24 <a name="l00014"></a>00014 <span class="preprocessor">#if defined(DEBUG)</span> |
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25 <a name="l00015"></a>00015 <span class="preprocessor"></span><span class="keyword">static</span> <span class="keywordtype">int</span> iPicCounter = 0; |
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26 <a name="l00016"></a>00016 <span class="preprocessor">#endif </span><span class="comment">/* DEBUG */</span> |
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27 <a name="l00017"></a>00017 |
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28 <a name="l00018"></a>00018 |
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29 <a name="l00019"></a>00019 <span class="comment">/*</span> |
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30 <a name="l00020"></a>00020 <span class="comment"> * tSkipToData - skip until a IDAT chunk is found</span> |
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31 <a name="l00021"></a>00021 <span class="comment"> *</span> |
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32 <a name="l00022"></a>00022 <span class="comment"> * returns the length of the pixeldata or -1 in case of error</span> |
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33 <a name="l00023"></a>00023 <span class="comment"> */</span> |
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34 <a name="l00024"></a>00024 <span class="keyword">static</span> <span class="keywordtype">size_t</span> |
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35 <a name="l00025"></a>00025 tSkipToData(FILE *pFile, <span class="keywordtype">size_t</span> tMaxBytes, <span class="keywordtype">size_t</span> *ptSkipped) |
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36 <a name="l00026"></a>00026 { |
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37 <a name="l00027"></a>00027 ULONG ulName, ulTmp; |
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38 <a name="l00028"></a>00028 <span class="keywordtype">size_t</span> tDataLength, tToSkip; |
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39 <a name="l00029"></a>00029 <span class="keywordtype">int</span> iCounter; |
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40 <a name="l00030"></a>00030 |
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41 <a name="l00031"></a>00031 fail(pFile == NULL); |
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42 <a name="l00032"></a>00032 fail(ptSkipped == NULL); |
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43 <a name="l00033"></a>00033 |
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44 <a name="l00034"></a>00034 <span class="comment">/* Examine chunks */</span> |
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45 <a name="l00035"></a>00035 <span class="keywordflow">while</span> (*ptSkipped + 8 < tMaxBytes) { |
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46 <a name="l00036"></a>00036 tDataLength = (size_t)ulNextLongBE(pFile); |
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47 <a name="l00037"></a>00037 DBG_DEC(tDataLength); |
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48 <a name="l00038"></a>00038 *ptSkipped += 4; |
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49 <a name="l00039"></a>00039 |
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50 <a name="l00040"></a>00040 ulName = 0x00; |
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51 <a name="l00041"></a>00041 <span class="keywordflow">for</span> (iCounter = 0; iCounter < 4; iCounter++) { |
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52 <a name="l00042"></a>00042 ulTmp = (ULONG)iNextByte(pFile); |
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53 <a name="l00043"></a>00043 <span class="keywordflow">if</span> (!isalpha((<span class="keywordtype">int</span>)ulTmp)) { |
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54 <a name="l00044"></a>00044 DBG_HEX(ulTmp); |
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55 <a name="l00045"></a>00045 <span class="keywordflow">return</span> (<span class="keywordtype">size_t</span>)-1; |
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56 <a name="l00046"></a>00046 } |
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57 <a name="l00047"></a>00047 ulName <<= 8; |
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58 <a name="l00048"></a>00048 ulName |= ulTmp; |
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59 <a name="l00049"></a>00049 } |
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60 <a name="l00050"></a>00050 DBG_HEX(ulName); |
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61 <a name="l00051"></a>00051 *ptSkipped += 4; |
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62 <a name="l00052"></a>00052 |
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63 <a name="l00053"></a>00053 <span class="keywordflow">if</span> (ulName == PNG_CN_IEND) { |
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64 <a name="l00054"></a>00054 <span class="keywordflow">break</span>; |
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65 <a name="l00055"></a>00055 } |
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66 <a name="l00056"></a>00056 <span class="keywordflow">if</span> (ulName == PNG_CN_IDAT) { |
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67 <a name="l00057"></a>00057 <span class="keywordflow">return</span> tDataLength; |
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68 <a name="l00058"></a>00058 } |
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69 <a name="l00059"></a>00059 |
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70 <a name="l00060"></a>00060 tToSkip = tDataLength + 4; |
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71 <a name="l00061"></a>00061 <span class="keywordflow">if</span> (tToSkip >= tMaxBytes - *ptSkipped) { |
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72 <a name="l00062"></a>00062 DBG_DEC(tToSkip); |
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73 <a name="l00063"></a>00063 DBG_DEC(tMaxBytes - *ptSkipped); |
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74 <a name="l00064"></a>00064 <span class="keywordflow">return</span> (<span class="keywordtype">size_t</span>)-1; |
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75 <a name="l00065"></a>00065 } |
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76 <a name="l00066"></a>00066 (void)tSkipBytes(pFile, tToSkip); |
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77 <a name="l00067"></a>00067 *ptSkipped += tToSkip; |
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78 <a name="l00068"></a>00068 } |
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79 <a name="l00069"></a>00069 |
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80 <a name="l00070"></a>00070 <span class="keywordflow">return</span> (<span class="keywordtype">size_t</span>)-1; |
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81 <a name="l00071"></a>00071 } <span class="comment">/* end of iSkipToData */</span> |
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82 <a name="l00072"></a>00072 |
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83 <a name="l00073"></a>00073 <span class="comment">/*</span> |
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84 <a name="l00074"></a>00074 <span class="comment"> * iFindFirstPixelData - find the first pixeldata if a PNG image</span> |
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85 <a name="l00075"></a>00075 <span class="comment"> *</span> |
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86 <a name="l00076"></a>00076 <span class="comment"> * returns the length of the pixeldata or -1 in case of error</span> |
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87 <a name="l00077"></a>00077 <span class="comment"> */</span> |
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88 <a name="l00078"></a>00078 <span class="keyword">static</span> <span class="keywordtype">size_t</span> |
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89 <a name="l00079"></a>00079 tFindFirstPixelData(FILE *pFile, <span class="keywordtype">size_t</span> tMaxBytes, <span class="keywordtype">size_t</span> *ptSkipped) |
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90 <a name="l00080"></a>00080 { |
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91 <a name="l00081"></a>00081 fail(pFile == NULL); |
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92 <a name="l00082"></a>00082 fail(tMaxBytes == 0); |
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93 <a name="l00083"></a>00083 fail(ptSkipped == NULL); |
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94 <a name="l00084"></a>00084 |
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95 <a name="l00085"></a>00085 <span class="keywordflow">if</span> (tMaxBytes < 8) { |
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96 <a name="l00086"></a>00086 DBG_DEC(tMaxBytes); |
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97 <a name="l00087"></a>00087 <span class="keywordflow">return</span> (<span class="keywordtype">size_t</span>)-1; |
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98 <a name="l00088"></a>00088 } |
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99 <a name="l00089"></a>00089 |
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100 <a name="l00090"></a>00090 <span class="comment">/* Skip over the PNG signature */</span> |
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101 <a name="l00091"></a>00091 (void)tSkipBytes(pFile, 8); |
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102 <a name="l00092"></a>00092 *ptSkipped = 8; |
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103 <a name="l00093"></a>00093 |
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104 <a name="l00094"></a>00094 <span class="keywordflow">return</span> tSkipToData(pFile, tMaxBytes, ptSkipped); |
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105 <a name="l00095"></a>00095 } <span class="comment">/* end of iFindFirstPixelData */</span> |
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106 <a name="l00096"></a>00096 |
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107 <a name="l00097"></a>00097 <span class="comment">/*</span> |
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108 <a name="l00098"></a>00098 <span class="comment"> * tFindNextPixelData - find the next pixeldata if a PNG image</span> |
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109 <a name="l00099"></a>00099 <span class="comment"> *</span> |
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110 <a name="l00100"></a>00100 <span class="comment"> * returns the length of the pixeldata or -1 in case of error</span> |
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111 <a name="l00101"></a>00101 <span class="comment"> */</span> |
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112 <a name="l00102"></a>00102 <span class="keyword">static</span> <span class="keywordtype">size_t</span> |
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113 <a name="l00103"></a>00103 tFindNextPixelData(FILE *pFile, <span class="keywordtype">size_t</span> tMaxBytes, <span class="keywordtype">size_t</span> *ptSkipped) |
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114 <a name="l00104"></a>00104 { |
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115 <a name="l00105"></a>00105 fail(pFile == NULL); |
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116 <a name="l00106"></a>00106 fail(tMaxBytes == 0); |
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117 <a name="l00107"></a>00107 fail(ptSkipped == NULL); |
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118 <a name="l00108"></a>00108 |
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119 <a name="l00109"></a>00109 <span class="keywordflow">if</span> (tMaxBytes < 4) { |
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120 <a name="l00110"></a>00110 DBG_DEC(tMaxBytes); |
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121 <a name="l00111"></a>00111 <span class="keywordflow">return</span> (<span class="keywordtype">size_t</span>)-1; |
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122 <a name="l00112"></a>00112 } |
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123 <a name="l00113"></a>00113 |
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124 <a name="l00114"></a>00114 <span class="comment">/* Skip over the crc */</span> |
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125 <a name="l00115"></a>00115 (void)tSkipBytes(pFile, 4); |
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126 <a name="l00116"></a>00116 *ptSkipped = 4; |
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127 <a name="l00117"></a>00117 |
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128 <a name="l00118"></a>00118 <span class="keywordflow">return</span> tSkipToData(pFile, tMaxBytes, ptSkipped); |
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129 <a name="l00119"></a>00119 } <span class="comment">/* end of tFindNextPixelData */</span> |
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130 <a name="l00120"></a>00120 |
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131 <a name="l00121"></a>00121 <span class="preprocessor">#if defined(DEBUG)</span> |
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132 <a name="l00122"></a>00122 <span class="preprocessor"></span><span class="comment">/*</span> |
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133 <a name="l00123"></a>00123 <span class="comment"> * vCopy2File</span> |
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134 <a name="l00124"></a>00124 <span class="comment"> */</span> |
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135 <a name="l00125"></a>00125 <span class="keyword">static</span> <span class="keywordtype">void</span> |
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136 <a name="l00126"></a>00126 vCopy2File(FILE *pFile, ULONG ulFileOffset, <span class="keywordtype">size_t</span> tPictureLen) |
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137 <a name="l00127"></a>00127 { |
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138 <a name="l00128"></a>00128 FILE *pOutFile; |
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139 <a name="l00129"></a>00129 <span class="keywordtype">size_t</span> tIndex; |
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140 <a name="l00130"></a>00130 <span class="keywordtype">int</span> iTmp; |
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141 <a name="l00131"></a>00131 <span class="keywordtype">char</span> szFilename[30]; |
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142 <a name="l00132"></a>00132 |
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143 <a name="l00133"></a>00133 <span class="keywordflow">if</span> (!bSetDataOffset(pFile, ulFileOffset)) { |
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144 <a name="l00134"></a>00134 <span class="keywordflow">return</span>; |
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145 <a name="l00135"></a>00135 } |
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146 <a name="l00136"></a>00136 |
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147 <a name="l00137"></a>00137 sprintf(szFilename, <span class="stringliteral">"/tmp/pic/pic%04d.png"</span>, ++iPicCounter); |
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148 <a name="l00138"></a>00138 pOutFile = fopen(szFilename, <span class="stringliteral">"wb"</span>); |
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149 <a name="l00139"></a>00139 <span class="keywordflow">if</span> (pOutFile == NULL) { |
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150 <a name="l00140"></a>00140 <span class="keywordflow">return</span>; |
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151 <a name="l00141"></a>00141 } |
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152 <a name="l00142"></a>00142 <span class="keywordflow">for</span> (tIndex = 0; tIndex < tPictureLen; tIndex++) { |
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153 <a name="l00143"></a>00143 iTmp = iNextByte(pFile); |
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154 <a name="l00144"></a>00144 <span class="keywordflow">if</span> (putc(iTmp, pOutFile) == EOF) { |
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155 <a name="l00145"></a>00145 <span class="keywordflow">break</span>; |
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156 <a name="l00146"></a>00146 } |
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157 <a name="l00147"></a>00147 } |
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158 <a name="l00148"></a>00148 (void)fclose(pOutFile); |
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159 <a name="l00149"></a>00149 } <span class="comment">/* end of vCopy2File */</span> |
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160 <a name="l00150"></a>00150 <span class="preprocessor">#endif </span><span class="comment">/* DEBUG */</span> |
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161 <a name="l00151"></a>00151 |
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162 <a name="l00152"></a>00152 <span class="comment">/*</span> |
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163 <a name="l00153"></a>00153 <span class="comment"> * bTranslatePNG - translate a PNG image</span> |
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164 <a name="l00154"></a>00154 <span class="comment"> *</span> |
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165 <a name="l00155"></a>00155 <span class="comment"> * This function translates an image from png to eps</span> |
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166 <a name="l00156"></a>00156 <span class="comment"> *</span> |
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167 <a name="l00157"></a>00157 <span class="comment"> * return TRUE when sucessful, otherwise FALSE</span> |
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168 <a name="l00158"></a>00158 <span class="comment"> */</span> |
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169 <a name="l00159"></a>00159 BOOL |
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170 <a name="l00160"></a>00160 bTranslatePNG(diagram_type *pDiag, FILE *pFile, |
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171 <a name="l00161"></a>00161 ULONG ulFileOffset, <span class="keywordtype">size_t</span> tPictureLen, <span class="keyword">const</span> imagedata_type *pImg) |
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172 <a name="l00162"></a>00162 { |
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173 <a name="l00163"></a>00163 <span class="keywordtype">size_t</span> tMaxBytes, tDataLength, tSkipped; |
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174 <a name="l00164"></a>00164 |
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175 <a name="l00165"></a>00165 <span class="preprocessor">#if defined(DEBUG)</span> |
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176 <a name="l00166"></a>00166 <span class="preprocessor"></span> vCopy2File(pFile, ulFileOffset, tPictureLen); |
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177 <a name="l00167"></a>00167 <span class="preprocessor">#endif </span><span class="comment">/* DEBUG */</span> |
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178 <a name="l00168"></a>00168 |
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179 <a name="l00169"></a>00169 <span class="comment">/* Seek to start position of PNG data */</span> |
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180 <a name="l00170"></a>00170 <span class="keywordflow">if</span> (!bSetDataOffset(pFile, ulFileOffset)) { |
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181 <a name="l00171"></a>00171 <span class="keywordflow">return</span> FALSE; |
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182 <a name="l00172"></a>00172 } |
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183 <a name="l00173"></a>00173 |
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184 <a name="l00174"></a>00174 tMaxBytes = tPictureLen; |
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185 <a name="l00175"></a>00175 tDataLength = tFindFirstPixelData(pFile, tMaxBytes, &tSkipped); |
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186 <a name="l00176"></a>00176 <span class="keywordflow">if</span> (tDataLength == (<span class="keywordtype">size_t</span>)-1) { |
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187 <a name="l00177"></a>00177 <span class="keywordflow">return</span> FALSE; |
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188 <a name="l00178"></a>00178 } |
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189 <a name="l00179"></a>00179 |
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190 <a name="l00180"></a>00180 vImagePrologue(pDiag, pImg); |
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191 <a name="l00181"></a>00181 <span class="keywordflow">do</span> { |
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192 <a name="l00182"></a>00182 tMaxBytes -= tSkipped; |
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193 <a name="l00183"></a>00183 vASCII85EncodeArray(pFile, pDiag->pOutFile, tDataLength); |
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194 <a name="l00184"></a>00184 tMaxBytes -= tDataLength; |
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195 <a name="l00185"></a>00185 tDataLength = tFindNextPixelData(pFile, tMaxBytes, &tSkipped); |
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196 <a name="l00186"></a>00186 } <span class="keywordflow">while</span> (tDataLength != (<span class="keywordtype">size_t</span>)-1); |
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197 <a name="l00187"></a>00187 vASCII85EncodeByte(pDiag->pOutFile, EOF); |
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198 <a name="l00188"></a>00188 vImageEpilogue(pDiag); |
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199 <a name="l00189"></a>00189 |
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200 <a name="l00190"></a>00190 <span class="keywordflow">return</span> TRUE; |
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201 <a name="l00191"></a>00191 } <span class="comment">/* end of bTranslatePNG */</span> |
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202 </pre></div></div> |
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