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  1. /* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
  2. /* cairo - a vector graphics library with display and print output
  3.  *
  4.  * Copyright © 2005-2007 Emmanuel Pacaud <emmanuel.pacaud@free.fr>
  5.  * Copyright © 2009 Chris Wilson
  6.  *
  7.  * This library is free software; you can redistribute it and/or
  8.  * modify it either under the terms of the GNU Lesser General Public
  9.  * License version 2.1 as published by the Free Software Foundation
  10.  * (the "LGPL") or, at your option, under the terms of the Mozilla
  11.  * Public License Version 1.1 (the "MPL"). If you do not alter this
  12.  * notice, a recipient may use your version of this file under either
  13.  * the MPL or the LGPL.
  14.  *
  15.  * You should have received a copy of the LGPL along with this library
  16.  * in the file COPYING-LGPL-2.1; if not, write to the Free Software
  17.  * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
  18.  * You should have received a copy of the MPL along with this library
  19.  * in the file COPYING-MPL-1.1
  20.  *
  21.  * The contents of this file are subject to the Mozilla Public License
  22.  * Version 1.1 (the "License"); you may not use this file except in
  23.  * compliance with the License. You may obtain a copy of the License at
  24.  * http://www.mozilla.org/MPL/
  25.  *
  26.  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
  27.  * OF ANY KIND, either express or implied. See the LGPL or the MPL for
  28.  * the specific language governing rights and limitations.
  29.  *
  30.  * The Original Code is the cairo graphics library.
  31.  *
  32.  * The Initial Developer of the Original Code is Red Hat, Inc.
  33.  *
  34.  * Author(s):
  35.  *      Kristian Høgsberg <krh@redhat.com>
  36.  *      Chris Wilson <chris@chris-wilson.co.uk>
  37.  */
  38.  
  39. #include "cairoint.h"
  40. #include "cairo-error-private.h"
  41. #include "cairo-output-stream-private.h"
  42.  
  43. typedef struct _cairo_base64_stream {
  44.     cairo_output_stream_t base;
  45.     cairo_output_stream_t *output;
  46.     unsigned int in_mem;
  47.     unsigned int trailing;
  48.     unsigned char src[3];
  49. } cairo_base64_stream_t;
  50.  
  51. static char const base64_table[64] =
  52. "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  53.  
  54. static cairo_status_t
  55. _cairo_base64_stream_write (cairo_output_stream_t *base,
  56.                             const unsigned char   *data,
  57.                             unsigned int           length)
  58. {
  59.     cairo_base64_stream_t * stream = (cairo_base64_stream_t *) base;
  60.     unsigned char *src = stream->src;
  61.     unsigned int i;
  62.  
  63.     if (stream->in_mem + length < 3) {
  64.         for (i = 0; i < length; i++) {
  65.             src[i + stream->in_mem] = *data++;
  66.         }
  67.         stream->in_mem += length;
  68.         return CAIRO_STATUS_SUCCESS;
  69.     }
  70.  
  71.     do {
  72.         unsigned char dst[4];
  73.  
  74.         for (i = stream->in_mem; i < 3; i++) {
  75.             src[i] = *data++;
  76.             length--;
  77.         }
  78.         stream->in_mem = 0;
  79.  
  80.         dst[0] = base64_table[src[0] >> 2];
  81.         dst[1] = base64_table[(src[0] & 0x03) << 4 | src[1] >> 4];
  82.         dst[2] = base64_table[(src[1] & 0x0f) << 2 | src[2] >> 6];
  83.         dst[3] = base64_table[src[2] & 0xfc >> 2];
  84.         /* Special case for the last missing bits */
  85.         switch (stream->trailing) {
  86.             case 2:
  87.                 dst[2] = '=';
  88.             case 1:
  89.                 dst[3] = '=';
  90.             default:
  91.                 break;
  92.         }
  93.         _cairo_output_stream_write (stream->output, dst, 4);
  94.     } while (length >= 3);
  95.  
  96.     for (i = 0; i < length; i++) {
  97.         src[i] = *data++;
  98.     }
  99.     stream->in_mem = length;
  100.  
  101.     return _cairo_output_stream_get_status (stream->output);
  102. }
  103.  
  104. static cairo_status_t
  105. _cairo_base64_stream_close (cairo_output_stream_t *base)
  106. {
  107.     cairo_base64_stream_t *stream = (cairo_base64_stream_t *) base;
  108.     cairo_status_t status = CAIRO_STATUS_SUCCESS;
  109.  
  110.     if (stream->in_mem > 0) {
  111.         memset (stream->src + stream->in_mem, 0, 3 - stream->in_mem);
  112.         stream->trailing = 3 - stream->in_mem;
  113.         stream->in_mem = 3;
  114.         status = _cairo_base64_stream_write (base, NULL, 0);
  115.     }
  116.  
  117.     return status;
  118. }
  119.  
  120. cairo_output_stream_t *
  121. _cairo_base64_stream_create (cairo_output_stream_t *output)
  122. {
  123.     cairo_base64_stream_t *stream;
  124.  
  125.     if (output->status)
  126.         return _cairo_output_stream_create_in_error (output->status);
  127.  
  128.     stream = malloc (sizeof (cairo_base64_stream_t));
  129.     if (unlikely (stream == NULL)) {
  130.         _cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
  131.         return (cairo_output_stream_t *) &_cairo_output_stream_nil;
  132.     }
  133.  
  134.     _cairo_output_stream_init (&stream->base,
  135.                                _cairo_base64_stream_write,
  136.                                NULL,
  137.                                _cairo_base64_stream_close);
  138.  
  139.     stream->output = output;
  140.     stream->in_mem = 0;
  141.     stream->trailing = 0;
  142.  
  143.     return &stream->base;
  144. }
  145.