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