summaryrefslogtreecommitdiff
path: root/src/cairo-base64-stream.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/cairo-base64-stream.c')
-rw-r--r--src/cairo-base64-stream.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/src/cairo-base64-stream.c b/src/cairo-base64-stream.c
new file mode 100644
index 000000000..636431372
--- /dev/null
+++ b/src/cairo-base64-stream.c
@@ -0,0 +1,144 @@
+/* -*- 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;
+}