| /* -*- 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 |
| * http://www.mozilla.org/MPL/ |
| * |
| * 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] = '='; |
| 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 = 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; |
| } |