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11 <h1>examples/PIPS/antiword/src/asc85enc.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"> * asc85enc.c</span> |
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13 <a name="l00003"></a>00003 <span class="comment"> * Copyright (C) 2000-2003 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 for ASCII 85 encoding</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 <span class="comment"> * This part of the software is based on:</span> |
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20 <a name="l00010"></a>00010 <span class="comment"> * asc85ec.c - ASCII85 and Hex encoding for PostScript Level 2 and PDF</span> |
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21 <a name="l00011"></a>00011 <span class="comment"> * Copyright (C) 1994-99 Thomas Merz (tm@muc.de)</span> |
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22 <a name="l00012"></a>00012 <span class="comment"> *====================================================================</span> |
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23 <a name="l00013"></a>00013 <span class="comment"> * The credit should go to him, but all the bugs are mine.</span> |
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24 <a name="l00014"></a>00014 <span class="comment"> */</span> |
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25 <a name="l00015"></a>00015 |
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26 <a name="l00016"></a>00016 <span class="preprocessor">#include <stdio.h></span> |
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27 <a name="l00017"></a>00017 <span class="preprocessor">#include "antiword.h"</span> |
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28 <a name="l00018"></a>00018 |
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29 <a name="l00019"></a>00019 <span class="keyword">static</span> <span class="keyword">const</span> ULONG aulPower85[5] = { |
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30 <a name="l00020"></a>00020 1UL, 85UL, 85UL * 85, 85UL * 85 * 85, 85UL * 85 * 85 * 85, |
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31 <a name="l00021"></a>00021 }; |
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32 <a name="l00022"></a>00022 <span class="keyword">static</span> <span class="keywordtype">int</span> iOutBytes = 0; <span class="comment">/* Number of characters in an output line */</span> |
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33 <a name="l00023"></a>00023 <span class="keyword">static</span> <span class="keywordtype">char</span> cCharPrev = <span class="charliteral">'\0'</span>; |
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34 <a name="l00024"></a>00024 |
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35 <a name="l00025"></a>00025 <span class="comment">/*</span> |
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36 <a name="l00026"></a>00026 <span class="comment"> * Two percent characters at the start of a line will cause trouble</span> |
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37 <a name="l00027"></a>00027 <span class="comment"> * with some post-processing software. In order to avoid this, we</span> |
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38 <a name="l00028"></a>00028 <span class="comment"> * simply insert a line break if we encounter two percent characters</span> |
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39 <a name="l00029"></a>00029 <span class="comment"> * at the start of the line. Of course, this rather simplistic</span> |
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40 <a name="l00030"></a>00030 <span class="comment"> * algorithm may lead to a large line count in pathological cases,</span> |
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41 <a name="l00031"></a>00031 <span class="comment"> * but the chance for hitting such a case is very small, and even</span> |
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42 <a name="l00032"></a>00032 <span class="comment"> * so it's only a cosmetic flaw and not a functional restriction.</span> |
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43 <a name="l00033"></a>00033 <span class="comment"> */</span> |
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44 <a name="l00034"></a>00034 |
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45 <a name="l00035"></a>00035 <span class="comment">/*</span> |
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46 <a name="l00036"></a>00036 <span class="comment"> * vOutputByte - output one byte</span> |
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47 <a name="l00037"></a>00037 <span class="comment"> */</span> |
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48 <a name="l00038"></a>00038 <span class="keyword">static</span> <span class="keywordtype">void</span> |
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49 <a name="l00039"></a>00039 vOutputByte(ULONG ulChar, FILE *pOutFile) |
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50 <a name="l00040"></a>00040 { |
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51 <a name="l00041"></a>00041 <span class="keywordflow">if</span> (iOutBytes == 1 && cCharPrev == <span class="charliteral">'%'</span> && ulChar == (ULONG)<span class="charliteral">'%'</span>) { |
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52 <a name="l00042"></a>00042 <span class="keywordflow">if</span> (putc(<span class="charliteral">'\n'</span>, pOutFile) != EOF) { |
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53 <a name="l00043"></a>00043 iOutBytes = 0; |
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54 <a name="l00044"></a>00044 } |
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55 <a name="l00045"></a>00045 } |
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56 <a name="l00046"></a>00046 <span class="keywordflow">if</span> (putc((<span class="keywordtype">int</span>)ulChar, pOutFile) == EOF) { |
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57 <a name="l00047"></a>00047 <span class="keywordflow">return</span>; |
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58 <a name="l00048"></a>00048 } |
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59 <a name="l00049"></a>00049 iOutBytes++; |
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60 <a name="l00050"></a>00050 <span class="keywordflow">if</span> (iOutBytes > 63) { |
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61 <a name="l00051"></a>00051 <span class="keywordflow">if</span> (putc(<span class="charliteral">'\n'</span>, pOutFile) != EOF) { |
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62 <a name="l00052"></a>00052 iOutBytes = 0; |
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63 <a name="l00053"></a>00053 } |
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64 <a name="l00054"></a>00054 } |
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65 <a name="l00055"></a>00055 cCharPrev = (char)ulChar; |
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66 <a name="l00056"></a>00056 } <span class="comment">/* end of vOutputByte */</span> |
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67 <a name="l00057"></a>00057 |
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68 <a name="l00058"></a>00058 <span class="comment">/*</span> |
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69 <a name="l00059"></a>00059 <span class="comment"> * vASCII85EncodeByte - ASCII 85 encode a byte</span> |
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70 <a name="l00060"></a>00060 <span class="comment"> */</span> |
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71 <a name="l00061"></a>00061 <span class="keywordtype">void</span> |
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72 <a name="l00062"></a>00062 vASCII85EncodeByte(FILE *pOutFile, <span class="keywordtype">int</span> iByte) |
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73 <a name="l00063"></a>00063 { |
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74 <a name="l00064"></a>00064 <span class="keyword">static</span> ULONG ulBuffer[4] = { 0, 0, 0, 0 }; |
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75 <a name="l00065"></a>00065 <span class="keyword">static</span> <span class="keywordtype">int</span> iInBuffer = 0; |
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76 <a name="l00066"></a>00066 ULONG ulValue, ulTmp; |
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77 <a name="l00067"></a>00067 <span class="keywordtype">int</span> iIndex; |
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78 <a name="l00068"></a>00068 |
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79 <a name="l00069"></a>00069 fail(pOutFile == NULL); |
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80 <a name="l00070"></a>00070 fail(iInBuffer < 0); |
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81 <a name="l00071"></a>00071 fail(iInBuffer > 3); |
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82 <a name="l00072"></a>00072 |
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83 <a name="l00073"></a>00073 <span class="keywordflow">if</span> (iByte == EOF) { |
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84 <a name="l00074"></a>00074 <span class="comment">/* End Of File, time to clean up */</span> |
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85 <a name="l00075"></a>00075 <span class="keywordflow">if</span> (iInBuffer > 0 && iInBuffer < 4) { |
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86 <a name="l00076"></a>00076 <span class="comment">/* Encode the remaining bytes */</span> |
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87 <a name="l00077"></a>00077 ulValue = 0; |
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88 <a name="l00078"></a>00078 <span class="keywordflow">for</span> (iIndex = iInBuffer - 1; iIndex >= 0; iIndex--) { |
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89 <a name="l00079"></a>00079 ulValue |= |
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90 <a name="l00080"></a>00080 ulBuffer[iIndex] << (8 * (3 - iIndex)); |
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91 <a name="l00081"></a>00081 } |
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92 <a name="l00082"></a>00082 <span class="keywordflow">for</span> (iIndex = 4; iIndex >= 4 - iInBuffer; iIndex--) { |
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93 <a name="l00083"></a>00083 ulTmp = ulValue / aulPower85[iIndex]; |
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94 <a name="l00084"></a>00084 vOutputByte(ulTmp + <span class="charliteral">'!'</span>, pOutFile); |
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95 <a name="l00085"></a>00085 ulValue -= ulTmp * aulPower85[iIndex]; |
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96 <a name="l00086"></a>00086 } |
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97 <a name="l00087"></a>00087 } |
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98 <a name="l00088"></a>00088 <span class="comment">/* Add the End Of Data marker */</span> |
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99 <a name="l00089"></a>00089 (void)putc(<span class="charliteral">'~'</span>, pOutFile); |
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100 <a name="l00090"></a>00090 (void)putc(<span class="charliteral">'>'</span>, pOutFile); |
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101 <a name="l00091"></a>00091 (void)putc(<span class="charliteral">'\n'</span>, pOutFile); |
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102 <a name="l00092"></a>00092 <span class="comment">/* Reset the control variables */</span> |
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103 <a name="l00093"></a>00093 iInBuffer = 0; |
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104 <a name="l00094"></a>00094 iOutBytes = 0; |
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105 <a name="l00095"></a>00095 cCharPrev = <span class="charliteral">'\0'</span>; |
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106 <a name="l00096"></a>00096 <span class="keywordflow">return</span>; |
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107 <a name="l00097"></a>00097 } |
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108 <a name="l00098"></a>00098 |
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109 <a name="l00099"></a>00099 ulBuffer[iInBuffer] = (ULONG)iByte & 0xff; |
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110 <a name="l00100"></a>00100 iInBuffer++; |
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111 <a name="l00101"></a>00101 |
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112 <a name="l00102"></a>00102 <span class="keywordflow">if</span> (iInBuffer >= 4) { |
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113 <a name="l00103"></a>00103 ulValue = (ulBuffer[0] << 24) | (ulBuffer[1] << 16) | |
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114 <a name="l00104"></a>00104 (ulBuffer[2] << 8) | ulBuffer[3]; |
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115 <a name="l00105"></a>00105 <span class="keywordflow">if</span> (ulValue == 0) { |
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116 <a name="l00106"></a>00106 vOutputByte((ULONG)<span class="charliteral">'z'</span>, pOutFile); <span class="comment">/* Shortcut for 0 */</span> |
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117 <a name="l00107"></a>00107 } <span class="keywordflow">else</span> { |
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118 <a name="l00108"></a>00108 <span class="keywordflow">for</span> (iIndex = 4; iIndex >= 0; iIndex--) { |
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119 <a name="l00109"></a>00109 ulTmp = ulValue / aulPower85[iIndex]; |
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120 <a name="l00110"></a>00110 vOutputByte(ulTmp + <span class="charliteral">'!'</span>, pOutFile); |
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121 <a name="l00111"></a>00111 ulValue -= ulTmp * aulPower85[iIndex]; |
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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">/* Reset the buffer */</span> |
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125 <a name="l00115"></a>00115 iInBuffer = 0; |
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126 <a name="l00116"></a>00116 } |
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127 <a name="l00117"></a>00117 } <span class="comment">/* end of vASCII85EncodeByte */</span> |
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128 <a name="l00118"></a>00118 |
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129 <a name="l00119"></a>00119 <span class="comment">/*</span> |
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130 <a name="l00120"></a>00120 <span class="comment"> * vASCII85EncodeArray - ASCII 85 encode a byte array</span> |
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131 <a name="l00121"></a>00121 <span class="comment"> */</span> |
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132 <a name="l00122"></a>00122 <span class="keywordtype">void</span> |
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133 <a name="l00123"></a>00123 vASCII85EncodeArray(FILE *pInFile, FILE *pOutFile, <span class="keywordtype">size_t</span> tLength) |
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134 <a name="l00124"></a>00124 { |
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135 <a name="l00125"></a>00125 <span class="keywordtype">size_t</span> tCount; |
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136 <a name="l00126"></a>00126 <span class="keywordtype">int</span> iByte; |
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137 <a name="l00127"></a>00127 |
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138 <a name="l00128"></a>00128 fail(pInFile == NULL); |
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139 <a name="l00129"></a>00129 fail(pOutFile == NULL); |
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140 <a name="l00130"></a>00130 |
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141 <a name="l00131"></a>00131 DBG_DEC(tLength); |
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142 <a name="l00132"></a>00132 |
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143 <a name="l00133"></a>00133 <span class="keywordflow">for</span> (tCount = 0; tCount < tLength; tCount++) { |
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144 <a name="l00134"></a>00134 iByte = iNextByte(pInFile); |
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145 <a name="l00135"></a>00135 <span class="keywordflow">if</span> (iByte == EOF) { |
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146 <a name="l00136"></a>00136 <span class="keywordflow">break</span>; |
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147 <a name="l00137"></a>00137 } |
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148 <a name="l00138"></a>00138 vASCII85EncodeByte(pOutFile, iByte); |
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149 <a name="l00139"></a>00139 } |
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150 <a name="l00140"></a>00140 } <span class="comment">/* end of vASCII85EncodeArray */</span> |
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151 <a name="l00141"></a>00141 |
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152 <a name="l00142"></a>00142 <span class="comment">/*</span> |
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153 <a name="l00143"></a>00143 <span class="comment"> * vASCII85EncodeFile - ASCII 85 encode part of a file</span> |
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154 <a name="l00144"></a>00144 <span class="comment"> */</span> |
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155 <a name="l00145"></a>00145 <span class="keywordtype">void</span> |
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156 <a name="l00146"></a>00146 vASCII85EncodeFile(FILE *pInFile, FILE *pOutFile, <span class="keywordtype">size_t</span> tLength) |
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157 <a name="l00147"></a>00147 { |
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158 <a name="l00148"></a>00148 fail(pInFile == NULL); |
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159 <a name="l00149"></a>00149 fail(pOutFile == NULL); |
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160 <a name="l00150"></a>00150 fail(tLength == 0); |
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161 <a name="l00151"></a>00151 |
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162 <a name="l00152"></a>00152 vASCII85EncodeArray(pInFile, pOutFile, tLength); |
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163 <a name="l00153"></a>00153 vASCII85EncodeByte(pOutFile, EOF); |
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164 <a name="l00154"></a>00154 } <span class="comment">/* end of vASCII85EncodeFile */</span> |
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165 </pre></div></div> |
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