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428
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1 /* base64 interface for XEmacs.
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2 Copyright (C) 1998, 1999 Free Software Foundation, Inc.
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5137
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3 Copyright (C) 2010 Ben Wing.
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428
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Not in FSF. */
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23
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24 /* Author: William Perry <wmperry@aventail.com> */
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25
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26 #include <emodules.h>
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27
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28 unsigned char alphabet[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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29
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30 DEFUN ("base64-encode", Fbase64_encode, 1, 5, 0, /*
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31 Return the base64 encoding of an object.
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32 OBJECT is either a string or a buffer.
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33 Optional arguments START and END denote buffer positions for computing the
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34 hash of a portion of OBJECT. The optional CODING argument specifies the coding
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35 system the text is to be represented in while computing the digest. This only
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36 has meaning with MULE, and defaults to the current format of the data.
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37 If ERROR-ME-NOT is nil, report an error if the coding system can't be
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38 determined. Else assume binary coding if all else fails.
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39 */
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40 (object, start, end, coding, error_me_not))
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41 {
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5137
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42 int cols,bits,char_count;
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43 Lisp_Object instream, outstream,deststream;
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44 Lstream *istr, *ostr, *dstr;
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45 static Extbyte_dynarr *conversion_out_dynarr;
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46 static Extbyte_dynarr *out_dynarr;
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47 char tempbuf[1024]; /* some random amount */
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48 struct gcpro gcpro1, gcpro2;
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49 Lisp_Object conv_out_stream, coding_system;
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50 Lstream *costr;
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51 struct gcpro gcpro3;
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428
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52
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5137
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53 if (!conversion_out_dynarr)
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54 conversion_out_dynarr = Dynarr_new (Extbyte);
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55 else
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56 Dynarr_reset (conversion_out_dynarr);
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57
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58 if (!out_dynarr)
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59 out_dynarr = Dynarr_new (Extbyte);
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60 else
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61 Dynarr_reset (out_dynarr);
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62
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63 char_count = bits = cols = 0;
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64
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65 /* set up the in stream */
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66 if (BUFFERP (object))
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67 {
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68 struct buffer *b = XBUFFER (object);
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69 Charbpos begv, endv;
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70 /* Figure out where we need to get info from */
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71 get_buffer_range_char (b, start, end, &begv, &endv, GB_ALLOW_NIL);
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428
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72
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5137
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73 instream = make_lisp_buffer_input_stream (b, begv, endv, 0);
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74 }
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75 else
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76 {
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77 Bytecount bstart, bend;
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78 CHECK_STRING (object);
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79 get_string_range_byte (object, start, end, &bstart, &bend,
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80 GB_HISTORICAL_STRING_BEHAVIOR);
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81 instream = make_lisp_string_input_stream (object, bstart, bend);
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82 }
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83 istr = XLSTREAM (instream);
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428
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84
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5137
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85 /* Find out what format the buffer will be saved in, so we can make
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86 the digest based on what it will look like on disk */
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87 if (NILP (coding))
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88 {
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89 if (BUFFERP (object))
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428
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90 {
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5137
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91 /* Use the file coding for this buffer by default */
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92 coding_system = XBUFFER (object)->buffer_file_coding_system;
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428
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93 }
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5137
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94 else
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95 {
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96 /* attempt to autodetect the coding of the string. Note: this VERY hit-and-miss */
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97 enum eol_type eol = EOL_AUTODETECT;
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98 coding_system = Fget_coding_system (Qundecided);
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99 determine_real_coding_system (istr, &coding_system, &eol);
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100 }
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101 if (NILP (coding_system))
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102 coding_system = Fget_coding_system (Qbinary);
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103 else
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428
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104 {
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5137
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105 coding_system = Ffind_coding_system (coding_system);
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106 if (NILP (coding_system))
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107 coding_system = Fget_coding_system (Qbinary);
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428
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108 }
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5137
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109 }
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110 else
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111 {
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112 coding_system = Ffind_coding_system (coding);
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113 if (NILP (coding_system))
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114 {
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115 if (NILP (error_me_not))
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116 signal_simple_error ("No such coding system", coding);
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117 else
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118 coding_system = Fget_coding_system (Qbinary); /* default to binary */
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119 }
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120 }
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428
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121
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5137
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122 /* setup the out stream */
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123 outstream = make_dynarr_output_stream ((unsigned_char_dynarr *)conversion_out_dynarr);
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124 ostr = XLSTREAM (outstream);
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125 deststream = make_dynarr_output_stream ((unsigned_char_dynarr *)out_dynarr);
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126 dstr = XLSTREAM (deststream);
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127 /* setup the conversion stream */
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128 conv_out_stream = make_encoding_output_stream (ostr, coding_system);
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129 costr = XLSTREAM (conv_out_stream);
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130 GCPRO3 (instream, outstream, conv_out_stream);
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131
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132 /* Get the data while doing the conversion */
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133 while (1)
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134 {
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135 int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf));
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136 int l;
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137 if (!size_in_bytes)
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138 break;
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139 /* It does seem the flushes are necessary... */
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140 Lstream_write (costr, tempbuf, size_in_bytes);
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141 Lstream_flush (costr);
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142 Lstream_flush (ostr);
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143
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144 /* Update the base64 output buffer */
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145 for (l = 0; l < size_in_bytes; l++)
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428
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146 {
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5137
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147 bits += Dynarr_at (conversion_out_dynarr,l);
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148 char_count++;
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149 if (char_count == 3)
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428
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150 {
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5137
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151 static char obuf[4];
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152 obuf[0] = alphabet[(bits >> 18)];
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153 obuf[1] = alphabet[(bits >> 12) & 0x3f];
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154 obuf[2] = alphabet[(bits >> 6) & 0x3f];
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155 obuf[3] = alphabet[bits & 0x3f];
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156
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157 Lstream_write (dstr,obuf,sizeof (obuf));
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158 cols += 4;
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159 if (cols == 72)
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160 {
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161 Lstream_write (dstr,"\n",sizeof (unsigned char));
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162 cols = 0;
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163 }
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164 bits = char_count = 0;
|
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428
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165 }
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5137
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166 else
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428
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167 {
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5137
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168 bits <<= 8;
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428
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169 }
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170 }
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5137
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171 /* reset the dynarr */
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172 Lstream_rewind (ostr);
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173 }
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174 Lstream_close (istr);
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175 Lstream_close (costr);
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176 Lstream_close (ostr);
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428
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177
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5137
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178 if (char_count != 0)
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179 {
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180 bits <<= 16 - (8 * char_count);
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181 Lstream_write (dstr,&alphabet[bits >> 18],sizeof (unsigned char));
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182 Lstream_write (dstr,&alphabet[(bits >> 12) & 0x3f],sizeof (unsigned char));
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183 if (char_count == 1)
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184 {
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185 Lstream_write (dstr,"==",2 * sizeof (unsigned char));
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186 } else
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187 {
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188 Lstream_write (dstr,&alphabet[(bits >> 6) & 0x3f],sizeof (unsigned char));
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189 Lstream_write (dstr,"=",sizeof (unsigned char));
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428
|
190 }
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|
5137
|
191 }
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192 #if 0
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193 if (cols > 0)
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194 {
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195 Lstream_write (dstr,"\n",sizeof (unsigned char));
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|
|
196 }
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428
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197 #endif
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5137
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198 UNGCPRO;
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199 Lstream_delete (istr);
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200 Lstream_delete (ostr);
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201 Lstream_delete (costr);
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202 Lstream_flush (dstr);
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203 Lstream_delete (dstr);
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|
428
|
204
|
|
5137
|
205 return (make_string (Dynarr_atp (out_dynarr,0),Dynarr_length (out_dynarr)));
|
|
428
|
206 }
|
|
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207
|
|
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208 DEFUN ("base64-decode", Fbase64_decode, 1, 5, 0, /*
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|
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209 Undo the base64 encoding of an object.
|
|
|
210 OBJECT is either a string or a buffer.
|
|
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211 Optional arguments START and END denote buffer positions for computing the
|
|
|
212 hash of a portion of OBJECT. The optional CODING argument specifies the coding
|
|
|
213 system the text is to be represented in while computing the digest. This only
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|
|
214 has meaning with MULE, and defaults to the current format of the data.
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|
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215 If ERROR-ME-NOT is nil, report an error if the coding system can't be
|
|
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216 determined. Else assume binary coding if all else fails.
|
|
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217 */
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|
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218 (object, start, end, coding, error_me_not))
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|
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219 {
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|
5137
|
220 static char inalphabet[256], decoder[256];
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221 int i,cols,bits,char_count,hit_eof;
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222 Lisp_Object instream, outstream,deststream;
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223 Lstream *istr, *ostr, *dstr;
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|
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224 static Extbyte_dynarr *conversion_out_dynarr;
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|
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225 static Extbyte_dynarr *out_dynarr;
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|
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226 char tempbuf[1024]; /* some random amount */
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|
|
227 struct gcpro gcpro1, gcpro2;
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|
|
228 Lisp_Object conv_out_stream, coding_system;
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|
|
229 Lstream *costr;
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|
|
230 struct gcpro gcpro3;
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|
428
|
231
|
|
5137
|
232 for (i = (sizeof alphabet) - 1; i >= 0 ; i--)
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|
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233 {
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|
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234 inalphabet[alphabet[i]] = 1;
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|
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235 decoder[alphabet[i]] = i;
|
|
428
|
236 }
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|
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237
|
|
5137
|
238 if (!conversion_out_dynarr)
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|
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239 conversion_out_dynarr = Dynarr_new (Extbyte);
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|
|
240 else
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|
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241 Dynarr_reset (conversion_out_dynarr);
|
|
428
|
242
|
|
5137
|
243 if (!out_dynarr)
|
|
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244 out_dynarr = Dynarr_new (Extbyte);
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|
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245 else
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|
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246 Dynarr_reset (out_dynarr);
|
|
428
|
247
|
|
5137
|
248 char_count = bits = cols = hit_eof = 0;
|
|
428
|
249
|
|
5137
|
250 /* set up the in stream */
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|
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251 if (BUFFERP (object))
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|
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252 {
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|
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253 struct buffer *b = XBUFFER (object);
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|
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254 Charbpos begv, endv;
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|
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255 /* Figure out where we need to get info from */
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|
|
256 get_buffer_range_char (b, start, end, &begv, &endv, GB_ALLOW_NIL);
|
|
428
|
257
|
|
5137
|
258 instream = make_lisp_buffer_input_stream (b, begv, endv, 0);
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|
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259 }
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|
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260 else
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|
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261 {
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|
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262 Bytecount bstart, bend;
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|
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263 CHECK_STRING (object);
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|
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264 get_string_range_byte (object, start, end, &bstart, &bend,
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|
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265 GB_HISTORICAL_STRING_BEHAVIOR);
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266 instream = make_lisp_string_input_stream (object, bstart, bend);
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|
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267 }
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|
|
268 istr = XLSTREAM (instream);
|
|
428
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269
|
|
5137
|
270 /* Find out what format the buffer will be saved in, so we can make
|
|
|
271 the digest based on what it will look like on disk */
|
|
|
272 if (NILP (coding))
|
|
|
273 {
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|
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274 if (BUFFERP (object))
|
|
|
275 {
|
|
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276 /* Use the file coding for this buffer by default */
|
|
|
277 coding_system = XBUFFER (object)->buffer_file_coding_system;
|
|
|
278 }
|
|
|
279 else
|
|
|
280 {
|
|
|
281 /* attempt to autodetect the coding of the string. Note: this VERY hit-and-miss */
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|
|
282 enum eol_type eol = EOL_AUTODETECT;
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|
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283 coding_system = Fget_coding_system (Qundecided);
|
|
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284 determine_real_coding_system (istr, &coding_system, &eol);
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|
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285 }
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|
|
286 if (NILP (coding_system))
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|
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287 coding_system = Fget_coding_system (Qbinary);
|
|
|
288 else
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|
|
289 {
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|
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290 coding_system = Ffind_coding_system (coding_system);
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|
|
291 if (NILP (coding_system))
|
|
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292 coding_system = Fget_coding_system (Qbinary);
|
|
|
293 }
|
|
|
294 }
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|
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295 else
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|
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296 {
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|
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297 coding_system = Ffind_coding_system (coding);
|
|
|
298 if (NILP (coding_system))
|
|
428
|
299 {
|
|
5137
|
300 if (NILP (error_me_not))
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|
|
301 signal_simple_error ("No such coding system", coding);
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|
|
302 else
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|
|
303 coding_system = Fget_coding_system (Qbinary); /* default to binary */
|
|
|
304 }
|
|
|
305 }
|
|
|
306
|
|
|
307 /* setup the out stream */
|
|
|
308 outstream = make_dynarr_output_stream ((unsigned_char_dynarr *)conversion_out_dynarr);
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|
|
309 ostr = XLSTREAM (outstream);
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|
|
310 deststream = make_dynarr_output_stream ((unsigned_char_dynarr *)out_dynarr);
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|
|
311 dstr = XLSTREAM (deststream);
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|
|
312 /* setup the conversion stream */
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|
|
313 conv_out_stream = make_encoding_output_stream (ostr, coding_system);
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|
|
314 costr = XLSTREAM (conv_out_stream);
|
|
|
315 GCPRO3 (instream, outstream, conv_out_stream);
|
|
|
316
|
|
|
317 /* Get the data while doing the conversion */
|
|
|
318 while (1)
|
|
|
319 {
|
|
|
320 int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf));
|
|
|
321 int l;
|
|
|
322 if (!size_in_bytes)
|
|
|
323 {
|
|
|
324 hit_eof = 1;
|
|
|
325 break;
|
|
|
326 }
|
|
|
327 /* It does seem the flushes are necessary... */
|
|
|
328 Lstream_write (costr, tempbuf, size_in_bytes);
|
|
|
329 Lstream_flush (costr);
|
|
|
330 Lstream_flush (ostr);
|
|
|
331
|
|
|
332 /* Update the base64 output buffer */
|
|
|
333 for (l = 0; l < size_in_bytes; l++)
|
|
|
334 {
|
|
|
335 if (Dynarr_at (conversion_out_dynarr,l) == '=')
|
|
|
336 goto decoder_out;
|
|
|
337 bits += decoder[Dynarr_at (conversion_out_dynarr,l)];
|
|
|
338 fprintf (stderr,"%d\n",bits);
|
|
|
339 char_count++;
|
|
|
340 if (char_count == 4)
|
|
428
|
341 {
|
|
5137
|
342 static unsigned char obuf[3];
|
|
|
343 obuf[0] = (bits >> 16);
|
|
|
344 obuf[1] = (bits >> 8) & 0xff;
|
|
|
345 obuf[2] = (bits & 0xff);
|
|
|
346
|
|
|
347 Lstream_write (dstr,obuf,sizeof (obuf));
|
|
|
348 bits = char_count = 0;
|
|
428
|
349 }
|
|
5137
|
350 else
|
|
428
|
351 {
|
|
5137
|
352 bits <<= 6;
|
|
428
|
353 }
|
|
|
354 }
|
|
5137
|
355 /* reset the dynarr */
|
|
|
356 Lstream_rewind (ostr);
|
|
|
357 }
|
|
|
358 decoder_out:
|
|
|
359 Lstream_close (istr);
|
|
|
360 Lstream_close (costr);
|
|
|
361 Lstream_close (ostr);
|
|
428
|
362
|
|
5137
|
363 if (hit_eof)
|
|
|
364 {
|
|
|
365 if (char_count)
|
|
|
366 {
|
|
|
367 error_with_frob (object,"base64-decode failed: at least %d bits truncated",((4 - char_count) * 6));
|
|
428
|
368 }
|
|
5137
|
369 }
|
|
|
370 switch (char_count)
|
|
|
371 {
|
|
|
372 case 1:
|
|
|
373 error_with_frob (object, "base64 encoding incomplete: at least 2 bits missing");
|
|
|
374 break;
|
|
|
375 case 2:
|
|
|
376 char_count = bits >> 10;
|
|
|
377 Lstream_write (dstr,&char_count,sizeof (char_count));
|
|
|
378 break;
|
|
|
379 case 3:
|
|
|
380 {
|
|
|
381 unsigned char buf[2];
|
|
|
382 buf[0] = (bits >> 16);
|
|
|
383 buf[1] = (bits >> 8) & 0xff;
|
|
|
384 Lstream_write (dstr,buf,sizeof (buf));
|
|
|
385 break;
|
|
|
386 }
|
|
|
387 }
|
|
428
|
388
|
|
5137
|
389 UNGCPRO;
|
|
|
390 Lstream_delete (istr);
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391 Lstream_delete (ostr);
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392 Lstream_delete (costr);
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393 Lstream_flush (dstr);
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394 Lstream_delete (dstr);
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428
|
395
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5137
|
396 return (make_string (Dynarr_atp (out_dynarr,0),Dynarr_length (out_dynarr)));
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428
|
397 }
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|
|
398
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|
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399 void
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|
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400 syms_of_base64 (void)
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|
|
401 {
|
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5137
|
402 DEFSUBR (Fbase64_encode);
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|
|
403 DEFSUBR (Fbase64_decode);
|
|
428
|
404 }
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|
|
405
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|
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406 void
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|
|
407 vars_of_base64 (void)
|
|
|
408 {
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|
|
409 Fprovide (intern ("base64"));
|
|
|
410 }
|
