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265
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1 /* base64 interface for XEmacs.
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2 Copyright (C) 1998 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 /* Author: William Perry <wmperry@aventail.com> */
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24
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25 #include <config.h>
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26
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27 #include "lisp.h"
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28 #include "buffer.h"
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29 #include "insdel.h"
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30 #include "lstream.h"
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31 #ifdef FILE_CODING
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32 #include "file-coding.h"
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33 #endif
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34
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35 unsigned char alphabet[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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36
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37 DEFUN ("base64-encode", Fbase64_encode, 1, 5, 0, /*
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38 Return the base64 encoding of an object.
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39 OBJECT is either a string or a buffer.
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40 Optional arguments START and END denote buffer positions for computing the
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41 hash of a portion of OBJECT. The optional CODING argument specifies the coding
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42 system the text is to be represented in while computing the digest. This only
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43 has meaning with MULE, and defaults to the current format of the data.
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44 If ERROR-ME-NOT is nil, report an error if the coding system can't be
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45 determined. Else assume binary coding if all else fails.
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46 */
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47 (object, start, end, coding, error_me_not))
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48 {
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49 int cols,bits,char_count;
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50 Lisp_Object instream, outstream,deststream;
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51 Lstream *istr, *ostr, *dstr;
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52 static Extbyte_dynarr *conversion_out_dynarr;
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53 static Extbyte_dynarr *out_dynarr;
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54 char tempbuf[1024]; /* some random amount */
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55 struct gcpro gcpro1, gcpro2;
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56 #ifdef FILE_CODING
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57 Lisp_Object conv_out_stream, coding_system;
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58 Lstream *costr;
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59 struct gcpro gcpro3;
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60 #endif
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61
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62 if (!conversion_out_dynarr)
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63 conversion_out_dynarr = Dynarr_new (Extbyte);
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64 else
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65 Dynarr_reset (conversion_out_dynarr);
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66
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67 if (!out_dynarr)
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68 out_dynarr = Dynarr_new(Extbyte);
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69 else
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70 Dynarr_reset (out_dynarr);
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71
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72 char_count = bits = cols = 0;
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73
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74 /* set up the in stream */
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75 if (BUFFERP (object))
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76 {
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77 struct buffer *b = decode_buffer (object, 1);
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78 Bufpos begv, endv;
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79 /* Figure out where we need to get info from */
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80 get_buffer_range_char (b, start, end, &begv, &endv, GB_ALLOW_NIL);
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81
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82 instream = make_lisp_buffer_input_stream (b, begv, endv, 0);
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83 }
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84 else
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85 {
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86 Bytecount bstart, bend;
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87 CHECK_STRING (object);
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88 get_string_range_byte (object, start, end, &bstart, &bend,
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89 GB_HISTORICAL_STRING_BEHAVIOR);
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90 instream = make_lisp_string_input_stream (object, bstart, bend);
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91 }
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92 istr = XLSTREAM (instream);
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93
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94 #ifdef FILE_CODING
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95 /* Find out what format the buffer will be saved in, so we can make
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96 the digest based on what it will look like on disk */
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97 if (NILP(coding))
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98 {
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99 if (BUFFERP(object))
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100 {
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101 /* Use the file coding for this buffer by default */
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102 coding_system = XBUFFER(object)->buffer_file_coding_system;
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103 }
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104 else
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105 {
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106 /* attempt to autodetect the coding of the string. Note: this VERY hit-and-miss */
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107 enum eol_type eol = EOL_AUTODETECT;
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108 coding_system = Fget_coding_system(Qundecided);
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109 determine_real_coding_system(istr, &coding_system, &eol);
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110 }
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111 if (NILP(coding_system))
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112 coding_system = Fget_coding_system(Qbinary);
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113 else
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114 {
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115 coding_system = Ffind_coding_system (coding_system);
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116 if (NILP(coding_system))
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117 coding_system = Fget_coding_system(Qbinary);
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118 }
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119 }
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120 else
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121 {
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122 coding_system = Ffind_coding_system (coding);
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123 if (NILP(coding_system))
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124 {
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125 if (NILP(error_me_not))
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126 signal_simple_error("No such coding system", coding);
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127 else
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128 coding_system = Fget_coding_system(Qbinary); /* default to binary */
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129 }
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130 }
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131 #endif
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132
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133 /* setup the out stream */
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134 outstream = make_dynarr_output_stream((unsigned_char_dynarr *)conversion_out_dynarr);
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135 ostr = XLSTREAM (outstream);
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136 deststream = make_dynarr_output_stream((unsigned_char_dynarr *)out_dynarr);
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137 dstr = XLSTREAM (deststream);
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138 #ifdef FILE_CODING
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139 /* setup the conversion stream */
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140 conv_out_stream = make_encoding_output_stream (ostr, coding_system);
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141 costr = XLSTREAM (conv_out_stream);
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142 GCPRO3 (instream, outstream, conv_out_stream);
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143 #else
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144 GCPRO2 (instream, outstream);
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145 #endif
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146
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147 /* Get the data while doing the conversion */
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148 while (1) {
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149 int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf));
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150 int l;
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151 if (!size_in_bytes)
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152 break;
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153 /* It does seem the flushes are necessary... */
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154 #ifdef FILE_CODING
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155 Lstream_write (costr, tempbuf, size_in_bytes);
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156 Lstream_flush (costr);
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157 #else
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158 Lstream_write (ostr, tempbuf, size_in_bytes);
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159 #endif
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160 Lstream_flush (ostr);
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161
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162 /* Update the base64 output buffer */
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163 for (l = 0; l < size_in_bytes; l++) {
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164 bits += Dynarr_at(conversion_out_dynarr,l);
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165 char_count++;
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166 if (char_count == 3) {
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167 static char obuf[4];
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168 obuf[0] = alphabet[(bits >> 18)];
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169 obuf[1] = alphabet[(bits >> 12) & 0x3f];
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170 obuf[2] = alphabet[(bits >> 6) & 0x3f];
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171 obuf[3] = alphabet[bits & 0x3f];
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172
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173 Lstream_write(dstr,obuf,sizeof(obuf));
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174 cols += 4;
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175 if (cols == 72) {
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176 Lstream_write(dstr,"\n",sizeof(unsigned char));
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177 cols = 0;
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178 }
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179 bits = char_count = 0;
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180 } else {
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181 bits <<= 8;
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182 }
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183 }
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184 /* reset the dynarr */
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185 Lstream_rewind(ostr);
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186 }
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187 Lstream_close (istr);
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188 #ifdef FILE_CODING
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189 Lstream_close (costr);
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190 #endif
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191 Lstream_close (ostr);
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192
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193 if (char_count != 0) {
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194 bits <<= 16 - (8 * char_count);
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195 Lstream_write(dstr,&alphabet[bits >> 18],sizeof(unsigned char));
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196 Lstream_write(dstr,&alphabet[(bits >> 12) & 0x3f],sizeof(unsigned char));
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197 if (char_count == 1) {
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198 Lstream_write(dstr,"==",2 * sizeof(unsigned char));
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199 } else {
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200 Lstream_write(dstr,&alphabet[(bits >> 6) & 0x3f],sizeof(unsigned char));
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201 Lstream_write(dstr,"=",sizeof(unsigned char));
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202 }
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203 }
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204 #if 0
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205 if (cols > 0) {
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206 Lstream_write(dstr,"\n",sizeof(unsigned char));
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207 }
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208 #endif
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209 UNGCPRO;
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210 Lstream_delete (istr);
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211 Lstream_delete (ostr);
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212 #ifdef FILE_CODING
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213 Lstream_delete (costr);
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214 #endif
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215 Lstream_flush(dstr);
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216 Lstream_delete(dstr);
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217
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218 return(make_string(Dynarr_atp(out_dynarr,0),Dynarr_length(out_dynarr)));
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219 }
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220
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221 DEFUN ("base64-decode", Fbase64_decode, 1, 5, 0, /*
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222 Undo the base64 encoding of an object.
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223 OBJECT is either a string or a buffer.
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224 Optional arguments START and END denote buffer positions for computing the
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225 hash of a portion of OBJECT. The optional CODING argument specifies the coding
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226 system the text is to be represented in while computing the digest. This only
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227 has meaning with MULE, and defaults to the current format of the data.
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228 If ERROR-ME-NOT is nil, report an error if the coding system can't be
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229 determined. Else assume binary coding if all else fails.
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230 */
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231 (object, start, end, coding, error_me_not))
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232 {
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233 static char inalphabet[256], decoder[256];
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234 int i,cols,bits,char_count,hit_eof;
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235 Lisp_Object instream, outstream,deststream;
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236 Lstream *istr, *ostr, *dstr;
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237 static Extbyte_dynarr *conversion_out_dynarr;
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238 static Extbyte_dynarr *out_dynarr;
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239 char tempbuf[1024]; /* some random amount */
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240 struct gcpro gcpro1, gcpro2;
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241 #ifdef FILE_CODING
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242 Lisp_Object conv_out_stream, coding_system;
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243 Lstream *costr;
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244 struct gcpro gcpro3;
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245 #endif
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246
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247 for (i = (sizeof alphabet) - 1; i >= 0 ; i--) {
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248 inalphabet[alphabet[i]] = 1;
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249 decoder[alphabet[i]] = i;
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250 }
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251
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252 if (!conversion_out_dynarr)
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253 conversion_out_dynarr = Dynarr_new (Extbyte);
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254 else
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255 Dynarr_reset (conversion_out_dynarr);
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256
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257 if (!out_dynarr)
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258 out_dynarr = Dynarr_new(Extbyte);
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259 else
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260 Dynarr_reset (out_dynarr);
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261
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262 char_count = bits = cols = hit_eof = 0;
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263
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264 /* set up the in stream */
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265 if (BUFFERP (object))
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266 {
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267 struct buffer *b = decode_buffer (object, 1);
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268 Bufpos begv, endv;
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269 /* Figure out where we need to get info from */
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270 get_buffer_range_char (b, start, end, &begv, &endv, GB_ALLOW_NIL);
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271
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272 instream = make_lisp_buffer_input_stream (b, begv, endv, 0);
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273 }
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274 else
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275 {
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276 Bytecount bstart, bend;
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277 CHECK_STRING (object);
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278 get_string_range_byte (object, start, end, &bstart, &bend,
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279 GB_HISTORICAL_STRING_BEHAVIOR);
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280 instream = make_lisp_string_input_stream (object, bstart, bend);
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281 }
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282 istr = XLSTREAM (instream);
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283
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284 #ifdef FILE_CODING
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285 /* Find out what format the buffer will be saved in, so we can make
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286 the digest based on what it will look like on disk */
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287 if (NILP(coding))
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288 {
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289 if (BUFFERP(object))
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290 {
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291 /* Use the file coding for this buffer by default */
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292 coding_system = XBUFFER(object)->buffer_file_coding_system;
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293 }
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294 else
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295 {
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296 /* attempt to autodetect the coding of the string. Note: this VERY hit-and-miss */
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297 enum eol_type eol = EOL_AUTODETECT;
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298 coding_system = Fget_coding_system(Qundecided);
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299 determine_real_coding_system(istr, &coding_system, &eol);
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300 }
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301 if (NILP(coding_system))
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302 coding_system = Fget_coding_system(Qbinary);
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303 else
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304 {
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305 coding_system = Ffind_coding_system (coding_system);
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306 if (NILP(coding_system))
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307 coding_system = Fget_coding_system(Qbinary);
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308 }
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309 }
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310 else
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311 {
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312 coding_system = Ffind_coding_system (coding);
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313 if (NILP(coding_system))
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314 {
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315 if (NILP(error_me_not))
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316 signal_simple_error("No such coding system", coding);
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317 else
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318 coding_system = Fget_coding_system(Qbinary); /* default to binary */
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319 }
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320 }
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321 #endif
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322
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323 /* setup the out stream */
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324 outstream = make_dynarr_output_stream((unsigned_char_dynarr *)conversion_out_dynarr);
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325 ostr = XLSTREAM (outstream);
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326 deststream = make_dynarr_output_stream((unsigned_char_dynarr *)out_dynarr);
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327 dstr = XLSTREAM (deststream);
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328 #ifdef FILE_CODING
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329 /* setup the conversion stream */
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330 conv_out_stream = make_encoding_output_stream (ostr, coding_system);
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331 costr = XLSTREAM (conv_out_stream);
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332 GCPRO3 (instream, outstream, conv_out_stream);
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333 #else
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334 GCPRO2 (instream, outstream);
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335 #endif
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336
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337 /* Get the data while doing the conversion */
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338 while (1) {
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339 int size_in_bytes = Lstream_read (istr, tempbuf, sizeof (tempbuf));
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340 int l;
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341 if (!size_in_bytes) {
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342 hit_eof = 1;
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343 break;
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344 }
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345 /* It does seem the flushes are necessary... */
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346 #ifdef FILE_CODING
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347 Lstream_write (costr, tempbuf, size_in_bytes);
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348 Lstream_flush (costr);
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349 #else
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350 Lstream_write (ostr, tempbuf, size_in_bytes);
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351 #endif
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352 Lstream_flush (ostr);
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353
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354 /* Update the base64 output buffer */
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355 for (l = 0; l < size_in_bytes; l++) {
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356 if (Dynarr_at(conversion_out_dynarr,l) == '=')
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357 goto decoder_out;
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358 bits += decoder[Dynarr_at(conversion_out_dynarr,l)];
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359 fprintf(stderr,"%d\n",bits);
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360 char_count++;
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361 if (char_count == 4) {
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362 static unsigned char obuf[3];
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363 obuf[0] = (bits >> 16);
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364 obuf[1] = (bits >> 8) & 0xff;
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365 obuf[2] = (bits & 0xff);
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366
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367 Lstream_write(dstr,obuf,sizeof(obuf));
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368 bits = char_count = 0;
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369 } else {
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370 bits <<= 6;
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371 }
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372 }
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373 /* reset the dynarr */
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374 Lstream_rewind(ostr);
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375 }
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376 decoder_out:
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377 Lstream_close (istr);
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378 #ifdef FILE_CODING
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379 Lstream_close (costr);
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380 #endif
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381 Lstream_close (ostr);
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382
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383 if (hit_eof) {
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384 if (char_count) {
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385 error_with_frob(object,"base64-decode failed: at least %d bits truncated",((4 - char_count) * 6));
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386 }
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387 }
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388 switch(char_count) {
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389 case 1:
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390 error_with_frob(object, "base64 encoding incomplete: at least 2 bits missing");
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391 break;
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392 case 2:
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393 char_count = bits >> 10;
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394 Lstream_write(dstr,&char_count,sizeof(char_count));
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395 break;
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396 case 3:
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397 {
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398 unsigned char buf[2];
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399 buf[0] = (bits >> 16);
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400 buf[1] = (bits >> 8) & 0xff;
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401 Lstream_write(dstr,buf,sizeof(buf));
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402 break;
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403 }
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404 }
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405
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406 UNGCPRO;
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407 Lstream_delete (istr);
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408 Lstream_delete (ostr);
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409 #ifdef FILE_CODING
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410 Lstream_delete (costr);
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411 #endif
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412 Lstream_flush(dstr);
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413 Lstream_delete(dstr);
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414
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415 return(make_string(Dynarr_atp(out_dynarr,0),Dynarr_length(out_dynarr)));
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416 }
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417
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418 void
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|
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419 syms_of (void)
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|
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420 {
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421 DEFSUBR(Fbase64_encode);
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422 DEFSUBR(Fbase64_decode);
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|
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423 }
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424
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|
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425 void
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|
|
426 vars_of (void)
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|
|
427 {
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|
|
428 Fprovide (intern ("base64"));
|
|
|
429 }
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