LCOV - code coverage report
Current view: directory - gfx/cairo/cairo/src - cairo-deflate-stream.c (source / functions) Found Hit Coverage
Test: app.info Lines: 55 0 0.0 %
Date: 2012-06-02 Functions: 4 0 0.0 %

       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                 : #include "cairo-error-private.h"
      39                 : #include "cairo-output-stream-private.h"
      40                 : #include <zlib.h>
      41                 : 
      42                 : #define BUFFER_SIZE 16384
      43                 : 
      44                 : typedef struct _cairo_deflate_stream {
      45                 :     cairo_output_stream_t  base;
      46                 :     cairo_output_stream_t *output;
      47                 :     z_stream               zlib_stream;
      48                 :     unsigned char          input_buf[BUFFER_SIZE];
      49                 :     unsigned char          output_buf[BUFFER_SIZE];
      50                 : } cairo_deflate_stream_t;
      51                 : 
      52                 : static void
      53               0 : cairo_deflate_stream_deflate (cairo_deflate_stream_t *stream, cairo_bool_t flush)
      54                 : {
      55                 :     int ret;
      56                 :     cairo_bool_t finished;
      57                 : 
      58                 :     do {
      59               0 :         ret = deflate (&stream->zlib_stream, flush ? Z_FINISH : Z_NO_FLUSH);
      60               0 :         if (flush || stream->zlib_stream.avail_out == 0)
      61                 :         {
      62               0 :             _cairo_output_stream_write (stream->output,
      63               0 :                                         stream->output_buf,
      64               0 :                                         BUFFER_SIZE - stream->zlib_stream.avail_out);
      65               0 :             stream->zlib_stream.next_out = stream->output_buf;
      66               0 :             stream->zlib_stream.avail_out = BUFFER_SIZE;
      67                 :         }
      68                 : 
      69               0 :         finished = TRUE;
      70               0 :         if (stream->zlib_stream.avail_in != 0)
      71               0 :             finished = FALSE;
      72               0 :         if (flush && ret != Z_STREAM_END)
      73               0 :             finished = FALSE;
      74                 : 
      75               0 :     } while (!finished);
      76                 : 
      77               0 :     stream->zlib_stream.next_in = stream->input_buf;
      78               0 : }
      79                 : 
      80                 : static cairo_status_t
      81               0 : _cairo_deflate_stream_write (cairo_output_stream_t *base,
      82                 :                              const unsigned char   *data,
      83                 :                              unsigned int           length)
      84                 : {
      85               0 :     cairo_deflate_stream_t *stream = (cairo_deflate_stream_t *) base;
      86                 :     unsigned int count;
      87               0 :     const unsigned char *p = data;
      88                 : 
      89               0 :     while (length) {
      90               0 :         count = length;
      91               0 :         if (count > BUFFER_SIZE - stream->zlib_stream.avail_in)
      92               0 :             count = BUFFER_SIZE - stream->zlib_stream.avail_in;
      93               0 :         memcpy (stream->input_buf + stream->zlib_stream.avail_in, p, count);
      94               0 :         p += count;
      95               0 :         stream->zlib_stream.avail_in += count;
      96               0 :         length -= count;
      97                 : 
      98               0 :         if (stream->zlib_stream.avail_in == BUFFER_SIZE)
      99               0 :             cairo_deflate_stream_deflate (stream, FALSE);
     100                 :     }
     101                 : 
     102               0 :     return _cairo_output_stream_get_status (stream->output);
     103                 : }
     104                 : 
     105                 : static cairo_status_t
     106               0 : _cairo_deflate_stream_close (cairo_output_stream_t *base)
     107                 : {
     108               0 :     cairo_deflate_stream_t *stream = (cairo_deflate_stream_t *) base;
     109                 : 
     110               0 :     cairo_deflate_stream_deflate (stream, TRUE);
     111               0 :     deflateEnd (&stream->zlib_stream);
     112                 : 
     113               0 :     return _cairo_output_stream_get_status (stream->output);
     114                 : }
     115                 : 
     116                 : cairo_output_stream_t *
     117               0 : _cairo_deflate_stream_create (cairo_output_stream_t *output)
     118                 : {
     119                 :     cairo_deflate_stream_t *stream;
     120                 : 
     121               0 :     if (output->status)
     122               0 :         return _cairo_output_stream_create_in_error (output->status);
     123                 : 
     124               0 :     stream = malloc (sizeof (cairo_deflate_stream_t));
     125               0 :     if (unlikely (stream == NULL)) {
     126               0 :         _cairo_error_throw (CAIRO_STATUS_NO_MEMORY);
     127               0 :         return (cairo_output_stream_t *) &_cairo_output_stream_nil;
     128                 :     }
     129                 : 
     130               0 :     _cairo_output_stream_init (&stream->base,
     131                 :                                _cairo_deflate_stream_write,
     132                 :                                NULL,
     133                 :                                _cairo_deflate_stream_close);
     134               0 :     stream->output = output;
     135                 : 
     136               0 :     stream->zlib_stream.zalloc = Z_NULL;
     137               0 :     stream->zlib_stream.zfree  = Z_NULL;
     138               0 :     stream->zlib_stream.opaque  = Z_NULL;
     139                 : 
     140               0 :     if (deflateInit (&stream->zlib_stream, Z_DEFAULT_COMPRESSION) != Z_OK) {
     141               0 :         free (stream);
     142               0 :         return (cairo_output_stream_t *) &_cairo_output_stream_nil;
     143                 :     }
     144                 : 
     145               0 :     stream->zlib_stream.next_in = stream->input_buf;
     146               0 :     stream->zlib_stream.avail_in = 0;
     147               0 :     stream->zlib_stream.next_out = stream->output_buf;
     148               0 :     stream->zlib_stream.avail_out = BUFFER_SIZE;
     149                 : 
     150               0 :     return &stream->base;
     151                 : }

Generated by: LCOV version 1.7