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3959 | Serge | 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 |
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3 | * |
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4 | * Copyright © 2006 Adrian Johnson |
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5 | * |
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6 | * This library is free software; you can redistribute it and/or |
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7 | * modify it either under the terms of the GNU Lesser General Public |
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8 | * License version 2.1 as published by the Free Software Foundation |
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9 | * (the "LGPL") or, at your option, under the terms of the Mozilla |
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10 | * Public License Version 1.1 (the "MPL"). If you do not alter this |
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11 | * notice, a recipient may use your version of this file under either |
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12 | * the MPL or the LGPL. |
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13 | * |
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14 | * You should have received a copy of the LGPL along with this library |
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15 | * in the file COPYING-LGPL-2.1; if not, write to the Free Software |
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16 | * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA |
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17 | * You should have received a copy of the MPL along with this library |
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18 | * in the file COPYING-MPL-1.1 |
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19 | * |
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20 | * The contents of this file are subject to the Mozilla Public License |
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21 | * Version 1.1 (the "License"); you may not use this file except in |
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22 | * compliance with the License. You may obtain a copy of the License at |
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23 | * http://www.mozilla.org/MPL/ |
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24 | * |
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25 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY |
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26 | * OF ANY KIND, either express or implied. See the LGPL or the MPL for |
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27 | * the specific language governing rights and limitations. |
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28 | * |
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29 | * The Original Code is the cairo graphics library. |
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30 | * |
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31 | * The Initial Developer of the Original Code is Adrian Johnson. |
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32 | * |
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33 | * Author(s): |
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34 | * Adrian Johnson |
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35 | */ |
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36 | |||
37 | #include "cairoint.h" |
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38 | |||
39 | #if CAIRO_HAS_DEFLATE_STREAM |
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40 | |||
41 | #include "cairo-error-private.h" |
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42 | #include "cairo-output-stream-private.h" |
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43 | #include |
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44 | |||
45 | #define BUFFER_SIZE 16384 |
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46 | |||
47 | typedef struct _cairo_deflate_stream { |
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48 | cairo_output_stream_t base; |
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49 | cairo_output_stream_t *output; |
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50 | z_stream zlib_stream; |
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51 | unsigned char input_buf[BUFFER_SIZE]; |
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52 | unsigned char output_buf[BUFFER_SIZE]; |
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53 | } cairo_deflate_stream_t; |
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54 | |||
55 | static void |
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56 | cairo_deflate_stream_deflate (cairo_deflate_stream_t *stream, cairo_bool_t flush) |
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57 | { |
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58 | int ret; |
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59 | cairo_bool_t finished; |
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60 | |||
61 | do { |
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62 | ret = deflate (&stream->zlib_stream, flush ? Z_FINISH : Z_NO_FLUSH); |
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63 | if (flush || stream->zlib_stream.avail_out == 0) |
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64 | { |
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65 | _cairo_output_stream_write (stream->output, |
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66 | stream->output_buf, |
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67 | BUFFER_SIZE - stream->zlib_stream.avail_out); |
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68 | stream->zlib_stream.next_out = stream->output_buf; |
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69 | stream->zlib_stream.avail_out = BUFFER_SIZE; |
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70 | } |
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71 | |||
72 | finished = TRUE; |
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73 | if (stream->zlib_stream.avail_in != 0) |
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74 | finished = FALSE; |
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75 | if (flush && ret != Z_STREAM_END) |
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76 | finished = FALSE; |
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77 | |||
78 | } while (!finished); |
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79 | |||
80 | stream->zlib_stream.next_in = stream->input_buf; |
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81 | } |
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82 | |||
83 | static cairo_status_t |
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84 | _cairo_deflate_stream_write (cairo_output_stream_t *base, |
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85 | const unsigned char *data, |
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86 | unsigned int length) |
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87 | { |
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88 | cairo_deflate_stream_t *stream = (cairo_deflate_stream_t *) base; |
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89 | unsigned int count; |
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90 | const unsigned char *p = data; |
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91 | |||
92 | while (length) { |
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93 | count = length; |
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94 | if (count > BUFFER_SIZE - stream->zlib_stream.avail_in) |
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95 | count = BUFFER_SIZE - stream->zlib_stream.avail_in; |
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96 | memcpy (stream->input_buf + stream->zlib_stream.avail_in, p, count); |
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97 | p += count; |
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98 | stream->zlib_stream.avail_in += count; |
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99 | length -= count; |
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100 | |||
101 | if (stream->zlib_stream.avail_in == BUFFER_SIZE) |
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102 | cairo_deflate_stream_deflate (stream, FALSE); |
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103 | } |
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104 | |||
105 | return _cairo_output_stream_get_status (stream->output); |
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106 | } |
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107 | |||
108 | static cairo_status_t |
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109 | _cairo_deflate_stream_close (cairo_output_stream_t *base) |
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110 | { |
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111 | cairo_deflate_stream_t *stream = (cairo_deflate_stream_t *) base; |
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112 | |||
113 | cairo_deflate_stream_deflate (stream, TRUE); |
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114 | deflateEnd (&stream->zlib_stream); |
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115 | |||
116 | return _cairo_output_stream_get_status (stream->output); |
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117 | } |
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118 | |||
119 | cairo_output_stream_t * |
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120 | _cairo_deflate_stream_create (cairo_output_stream_t *output) |
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121 | { |
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122 | cairo_deflate_stream_t *stream; |
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123 | |||
124 | if (output->status) |
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125 | return _cairo_output_stream_create_in_error (output->status); |
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126 | |||
127 | stream = malloc (sizeof (cairo_deflate_stream_t)); |
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128 | if (unlikely (stream == NULL)) { |
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129 | _cairo_error_throw (CAIRO_STATUS_NO_MEMORY); |
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130 | return (cairo_output_stream_t *) &_cairo_output_stream_nil; |
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131 | } |
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132 | |||
133 | _cairo_output_stream_init (&stream->base, |
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134 | _cairo_deflate_stream_write, |
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135 | NULL, |
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136 | _cairo_deflate_stream_close); |
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137 | stream->output = output; |
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138 | |||
139 | stream->zlib_stream.zalloc = Z_NULL; |
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140 | stream->zlib_stream.zfree = Z_NULL; |
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141 | stream->zlib_stream.opaque = Z_NULL; |
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142 | |||
143 | if (deflateInit (&stream->zlib_stream, Z_DEFAULT_COMPRESSION) != Z_OK) { |
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144 | free (stream); |
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145 | return (cairo_output_stream_t *) &_cairo_output_stream_nil; |
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146 | } |
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147 | |||
148 | stream->zlib_stream.next_in = stream->input_buf; |
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149 | stream->zlib_stream.avail_in = 0; |
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150 | stream->zlib_stream.next_out = stream->output_buf; |
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151 | stream->zlib_stream.avail_out = BUFFER_SIZE; |
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152 | |||
153 | return &stream->base; |
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154 | } |
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155 | |||
156 | #endif /* CAIRO_HAS_DEFLATE_STREAM */ |