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  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
  3.  *
  4.  * Copyright © 2006 Adrian Johnson
  5.  *
  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.
  13.  *
  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
  19.  *
  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/
  24.  *
  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.
  28.  *
  29.  * The Original Code is the cairo graphics library.
  30.  *
  31.  * The Initial Developer of the Original Code is Adrian Johnson.
  32.  *
  33.  * Author(s):
  34.  *      Adrian Johnson <ajohnson@redneon.com>
  35.  */
  36.  
  37. #include "cairoint.h"
  38.  
  39. #if CAIRO_HAS_DEFLATE_STREAM
  40.  
  41. #include "cairo-error-private.h"
  42. #include "cairo-output-stream-private.h"
  43. #include <zlib.h>
  44.  
  45. #define BUFFER_SIZE 16384
  46.  
  47. typedef struct _cairo_deflate_stream {
  48.     cairo_output_stream_t  base;
  49.     cairo_output_stream_t *output;
  50.     z_stream               zlib_stream;
  51.     unsigned char          input_buf[BUFFER_SIZE];
  52.     unsigned char          output_buf[BUFFER_SIZE];
  53. } cairo_deflate_stream_t;
  54.  
  55. static void
  56. cairo_deflate_stream_deflate (cairo_deflate_stream_t *stream, cairo_bool_t flush)
  57. {
  58.     int ret;
  59.     cairo_bool_t finished;
  60.  
  61.     do {
  62.         ret = deflate (&stream->zlib_stream, flush ? Z_FINISH : Z_NO_FLUSH);
  63.         if (flush || stream->zlib_stream.avail_out == 0)
  64.         {
  65.             _cairo_output_stream_write (stream->output,
  66.                                         stream->output_buf,
  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;
  70.         }
  71.  
  72.         finished = TRUE;
  73.         if (stream->zlib_stream.avail_in != 0)
  74.             finished = FALSE;
  75.         if (flush && ret != Z_STREAM_END)
  76.             finished = FALSE;
  77.  
  78.     } while (!finished);
  79.  
  80.     stream->zlib_stream.next_in = stream->input_buf;
  81. }
  82.  
  83. static cairo_status_t
  84. _cairo_deflate_stream_write (cairo_output_stream_t *base,
  85.                              const unsigned char   *data,
  86.                              unsigned int           length)
  87. {
  88.     cairo_deflate_stream_t *stream = (cairo_deflate_stream_t *) base;
  89.     unsigned int count;
  90.     const unsigned char *p = data;
  91.  
  92.     while (length) {
  93.         count = length;
  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);
  97.         p += count;
  98.         stream->zlib_stream.avail_in += count;
  99.         length -= count;
  100.  
  101.         if (stream->zlib_stream.avail_in == BUFFER_SIZE)
  102.             cairo_deflate_stream_deflate (stream, FALSE);
  103.     }
  104.  
  105.     return _cairo_output_stream_get_status (stream->output);
  106. }
  107.  
  108. static cairo_status_t
  109. _cairo_deflate_stream_close (cairo_output_stream_t *base)
  110. {
  111.     cairo_deflate_stream_t *stream = (cairo_deflate_stream_t *) base;
  112.  
  113.     cairo_deflate_stream_deflate (stream, TRUE);
  114.     deflateEnd (&stream->zlib_stream);
  115.  
  116.     return _cairo_output_stream_get_status (stream->output);
  117. }
  118.  
  119. cairo_output_stream_t *
  120. _cairo_deflate_stream_create (cairo_output_stream_t *output)
  121. {
  122.     cairo_deflate_stream_t *stream;
  123.  
  124.     if (output->status)
  125.         return _cairo_output_stream_create_in_error (output->status);
  126.  
  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;
  131.     }
  132.  
  133.     _cairo_output_stream_init (&stream->base,
  134.                                _cairo_deflate_stream_write,
  135.                                NULL,
  136.                                _cairo_deflate_stream_close);
  137.     stream->output = output;
  138.  
  139.     stream->zlib_stream.zalloc = Z_NULL;
  140.     stream->zlib_stream.zfree  = Z_NULL;
  141.     stream->zlib_stream.opaque  = Z_NULL;
  142.  
  143.     if (deflateInit (&stream->zlib_stream, Z_DEFAULT_COMPRESSION) != Z_OK) {
  144.         free (stream);
  145.         return (cairo_output_stream_t *) &_cairo_output_stream_nil;
  146.     }
  147.  
  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;
  152.  
  153.     return &stream->base;
  154. }
  155.  
  156. #endif /* CAIRO_HAS_DEFLATE_STREAM */
  157.