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
4 * Copyright © 2006 Adrian Johnson
6 * This library is free software; you can redistribute it and/or
7 * modify it either under the terms of the GNU Lesser General Public
8 * License version 2.1 as published by the Free Software Foundation
9 * (the "LGPL") or, at your option, under the terms of the Mozilla
10 * Public License Version 1.1 (the "MPL"). If you do not alter this
11 * notice, a recipient may use your version of this file under either
12 * the MPL or the LGPL.
14 * You should have received a copy of the LGPL along with this library
15 * in the file COPYING-LGPL-2.1; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
17 * You should have received a copy of the MPL along with this library
18 * in the file COPYING-MPL-1.1
20 * The contents of this file are subject to the Mozilla Public License
21 * Version 1.1 (the "License"); you may not use this file except in
22 * compliance with the License. You may obtain a copy of the License at
23 * http://www.mozilla.org/MPL/
25 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
26 * OF ANY KIND, either express or implied. See the LGPL or the MPL for
27 * the specific language governing rights and limitations.
29 * The Original Code is the cairo graphics library.
31 * The Initial Developer of the Original Code is Adrian Johnson.
34 * Adrian Johnson <ajohnson@redneon.com>
39 #if CAIRO_HAS_DEFLATE_STREAM
41 #include "cairo-error-private.h"
42 #include "cairo-output-stream-private.h"
45 #define BUFFER_SIZE 16384
47 typedef struct _cairo_deflate_stream {
48 cairo_output_stream_t base;
49 cairo_output_stream_t *output;
51 unsigned char input_buf[BUFFER_SIZE];
52 unsigned char output_buf[BUFFER_SIZE];
53 } cairo_deflate_stream_t;
56 cairo_deflate_stream_deflate (cairo_deflate_stream_t *stream, cairo_bool_t flush)
59 cairo_bool_t finished;
62 ret = deflate (&stream->zlib_stream, flush ? Z_FINISH : Z_NO_FLUSH);
63 if (flush || stream->zlib_stream.avail_out == 0)
65 _cairo_output_stream_write (stream->output,
67 BUFFER_SIZE - stream->zlib_stream.avail_out);
68 stream->zlib_stream.next_out = stream->output_buf;
69 stream->zlib_stream.avail_out = BUFFER_SIZE;
73 if (stream->zlib_stream.avail_in != 0)
75 if (flush && ret != Z_STREAM_END)
80 stream->zlib_stream.next_in = stream->input_buf;
84 _cairo_deflate_stream_write (cairo_output_stream_t *base,
85 const unsigned char *data,
88 cairo_deflate_stream_t *stream = (cairo_deflate_stream_t *) base;
90 const unsigned char *p = data;
94 if (count > BUFFER_SIZE - stream->zlib_stream.avail_in)
95 count = BUFFER_SIZE - stream->zlib_stream.avail_in;
96 memcpy (stream->input_buf + stream->zlib_stream.avail_in, p, count);
98 stream->zlib_stream.avail_in += count;
101 if (stream->zlib_stream.avail_in == BUFFER_SIZE)
102 cairo_deflate_stream_deflate (stream, FALSE);
105 return _cairo_output_stream_get_status (stream->output);
108 static cairo_status_t
109 _cairo_deflate_stream_close (cairo_output_stream_t *base)
111 cairo_deflate_stream_t *stream = (cairo_deflate_stream_t *) base;
113 cairo_deflate_stream_deflate (stream, TRUE);
114 deflateEnd (&stream->zlib_stream);
116 return _cairo_output_stream_get_status (stream->output);
119 cairo_output_stream_t *
120 _cairo_deflate_stream_create (cairo_output_stream_t *output)
122 cairo_deflate_stream_t *stream;
125 return _cairo_output_stream_create_in_error (output->status);
127 stream = malloc (sizeof (cairo_deflate_stream_t));
128 if (unlikely (stream == NULL)) {
129 _cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
130 return (cairo_output_stream_t *) &_cairo_output_stream_nil;
133 _cairo_output_stream_init (&stream->base,
134 _cairo_deflate_stream_write,
136 _cairo_deflate_stream_close);
137 stream->output = output;
139 stream->zlib_stream.zalloc = Z_NULL;
140 stream->zlib_stream.zfree = Z_NULL;
141 stream->zlib_stream.opaque = Z_NULL;
143 if (deflateInit (&stream->zlib_stream, Z_DEFAULT_COMPRESSION) != Z_OK) {
145 return (cairo_output_stream_t *) &_cairo_output_stream_nil;
148 stream->zlib_stream.next_in = stream->input_buf;
149 stream->zlib_stream.avail_in = 0;
150 stream->zlib_stream.next_out = stream->output_buf;
151 stream->zlib_stream.avail_out = BUFFER_SIZE;
153 return &stream->base;
156 #endif /* CAIRO_HAS_DEFLATE_STREAM */