forked from KolibriOS/kolibrios
145 lines
4.3 KiB
C
145 lines
4.3 KiB
C
/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
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/* cairo - a vector graphics library with display and print output
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*
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* Copyright © 2005-2007 Emmanuel Pacaud <emmanuel.pacaud@free.fr>
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* Copyright © 2009 Chris Wilson
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*
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* This library is free software; you can redistribute it and/or
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* modify it either under the terms of the GNU Lesser General Public
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* License version 2.1 as published by the Free Software Foundation
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* (the "LGPL") or, at your option, under the terms of the Mozilla
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* Public License Version 1.1 (the "MPL"). If you do not alter this
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* notice, a recipient may use your version of this file under either
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* the MPL or the LGPL.
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*
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* You should have received a copy of the LGPL along with this library
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* in the file COPYING-LGPL-2.1; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
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* You should have received a copy of the MPL along with this library
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* in the file COPYING-MPL-1.1
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
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* OF ANY KIND, either express or implied. See the LGPL or the MPL for
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* the specific language governing rights and limitations.
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*
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* The Original Code is the cairo graphics library.
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*
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* The Initial Developer of the Original Code is Red Hat, Inc.
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*
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* Author(s):
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* Kristian Høgsberg <krh@redhat.com>
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* Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#include "cairoint.h"
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#include "cairo-error-private.h"
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#include "cairo-output-stream-private.h"
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typedef struct _cairo_base64_stream {
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cairo_output_stream_t base;
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cairo_output_stream_t *output;
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unsigned int in_mem;
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unsigned int trailing;
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unsigned char src[3];
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} cairo_base64_stream_t;
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static char const base64_table[64] =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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static cairo_status_t
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_cairo_base64_stream_write (cairo_output_stream_t *base,
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const unsigned char *data,
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unsigned int length)
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{
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cairo_base64_stream_t * stream = (cairo_base64_stream_t *) base;
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unsigned char *src = stream->src;
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unsigned int i;
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if (stream->in_mem + length < 3) {
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for (i = 0; i < length; i++) {
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src[i + stream->in_mem] = *data++;
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}
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stream->in_mem += length;
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return CAIRO_STATUS_SUCCESS;
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}
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do {
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unsigned char dst[4];
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for (i = stream->in_mem; i < 3; i++) {
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src[i] = *data++;
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length--;
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}
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stream->in_mem = 0;
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dst[0] = base64_table[src[0] >> 2];
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dst[1] = base64_table[(src[0] & 0x03) << 4 | src[1] >> 4];
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dst[2] = base64_table[(src[1] & 0x0f) << 2 | src[2] >> 6];
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dst[3] = base64_table[src[2] & 0xfc >> 2];
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/* Special case for the last missing bits */
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switch (stream->trailing) {
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case 2:
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dst[2] = '=';
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case 1:
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dst[3] = '=';
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default:
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break;
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}
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_cairo_output_stream_write (stream->output, dst, 4);
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} while (length >= 3);
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for (i = 0; i < length; i++) {
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src[i] = *data++;
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}
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stream->in_mem = length;
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return _cairo_output_stream_get_status (stream->output);
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}
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static cairo_status_t
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_cairo_base64_stream_close (cairo_output_stream_t *base)
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{
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cairo_base64_stream_t *stream = (cairo_base64_stream_t *) base;
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cairo_status_t status = CAIRO_STATUS_SUCCESS;
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if (stream->in_mem > 0) {
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memset (stream->src + stream->in_mem, 0, 3 - stream->in_mem);
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stream->trailing = 3 - stream->in_mem;
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stream->in_mem = 3;
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status = _cairo_base64_stream_write (base, NULL, 0);
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}
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return status;
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}
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cairo_output_stream_t *
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_cairo_base64_stream_create (cairo_output_stream_t *output)
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{
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cairo_base64_stream_t *stream;
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if (output->status)
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return _cairo_output_stream_create_in_error (output->status);
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stream = malloc (sizeof (cairo_base64_stream_t));
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if (unlikely (stream == NULL)) {
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_cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
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return (cairo_output_stream_t *) &_cairo_output_stream_nil;
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}
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_cairo_output_stream_init (&stream->base,
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_cairo_base64_stream_write,
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NULL,
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_cairo_base64_stream_close);
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stream->output = output;
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stream->in_mem = 0;
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stream->trailing = 0;
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return &stream->base;
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}
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