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<html><!-- Created using the cpp_pretty_printer from the dlib C++ library.  See http://dlib.net for updates. --><head><title>dlib C++ Library - pngwio.c</title></head><body bgcolor='white'><pre>

<font color='#009900'>/* pngwio.c - functions for data output
 *
 * Last changed in libpng 1.6.0 [February 14, 2013]
 * Copyright (c) 1998-2013 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
 * and license in png.h
 *
 * This file provides a location for all output.  Users who need
 * special handling are expected to write functions that have the same
 * arguments as these and perform similar functions, but that possibly
 * use different output methods.  Note that you shouldn't change these
 * functions, but rather write replacement functions and then change
 * them at run time with png_set_write_fn(...).
 */</font>

<font color='#0000FF'>#include</font> "<a style='text-decoration:none' href='pngpriv.h.html'>pngpriv.h</a>"

<font color='#0000FF'>#ifdef</font> PNG_WRITE_SUPPORTED

<font color='#009900'>/* Write the data to whatever output you are using.  The default routine
 * writes to a file pointer.  Note that this routine sometimes gets called
 * with very small lengths, so you should implement some kind of simple
 * buffering if you are using unbuffered writes.  This should never be asked
 * to write more than 64K on a 16 bit machine.
 */</font>

<font color='#0000FF'><u>void</u></font> <font color='#009900'>/* PRIVATE */</font>
<b><a name='png_write_data'></a>png_write_data</b><font face='Lucida Console'>(</font>png_structrp png_ptr, png_const_bytep data, png_size_t length<font face='Lucida Console'>)</font>
<b>{</b>
   <font color='#009900'>/* NOTE: write_data_fn must not change the buffer! */</font>
   <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>write_data_fn <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL <font face='Lucida Console'>)</font>
      <font face='Lucida Console'>(</font><font color='#5555FF'>*</font><font face='Lucida Console'>(</font>png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>write_data_fn<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font><font face='Lucida Console'>(</font>png_ptr, <font color='#BB00BB'>png_constcast</font><font face='Lucida Console'>(</font>png_bytep,data<font face='Lucida Console'>)</font>,
         length<font face='Lucida Console'>)</font>;

   <font color='#0000FF'>else</font>
      <font color='#BB00BB'>png_error</font><font face='Lucida Console'>(</font>png_ptr, "<font color='#CC0000'>Call to NULL write function</font>"<font face='Lucida Console'>)</font>;
<b>}</b>

<font color='#0000FF'>#ifdef</font> PNG_STDIO_SUPPORTED
<font color='#009900'>/* This is the function that does the actual writing of data.  If you are
 * not writing to a standard C stream, you should create a replacement
 * write_data function and use it at run time with png_set_write_fn(), rather
 * than changing the library.
 */</font>
<font color='#0000FF'><u>void</u></font> PNGCBAPI
<b><a name='png_default_write_data'></a>png_default_write_data</b><font face='Lucida Console'>(</font>png_structp png_ptr, png_bytep data, png_size_t length<font face='Lucida Console'>)</font>
<b>{</b>
   png_size_t check;

   <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>png_ptr <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
      <font color='#0000FF'>return</font>;

   check <font color='#5555FF'>=</font> <font color='#BB00BB'>fwrite</font><font face='Lucida Console'>(</font>data, <font color='#979000'>1</font>, length, <font face='Lucida Console'>(</font>png_FILE_p<font face='Lucida Console'>)</font><font face='Lucida Console'>(</font>png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>io_ptr<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;

   <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>check <font color='#5555FF'>!</font><font color='#5555FF'>=</font> length<font face='Lucida Console'>)</font>
      <font color='#BB00BB'>png_error</font><font face='Lucida Console'>(</font>png_ptr, "<font color='#CC0000'>Write Error</font>"<font face='Lucida Console'>)</font>;
<b>}</b>
<font color='#0000FF'>#endif</font>

<font color='#009900'>/* This function is called to output any data pending writing (normally
 * to disk).  After png_flush is called, there should be no data pending
 * writing in any buffers.
 */</font>
<font color='#0000FF'>#ifdef</font> PNG_WRITE_FLUSH_SUPPORTED
<font color='#0000FF'><u>void</u></font> <font color='#009900'>/* PRIVATE */</font>
<b><a name='png_flush'></a>png_flush</b><font face='Lucida Console'>(</font>png_structrp png_ptr<font face='Lucida Console'>)</font>
<b>{</b>
   <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>output_flush_fn <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
      <font face='Lucida Console'>(</font><font color='#5555FF'>*</font><font face='Lucida Console'>(</font>png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>output_flush_fn<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font><font face='Lucida Console'>(</font>png_ptr<font face='Lucida Console'>)</font>;
<b>}</b>

#  ifdef PNG_STDIO_SUPPORTED
<font color='#0000FF'><u>void</u></font> PNGCBAPI
<b><a name='png_default_flush'></a>png_default_flush</b><font face='Lucida Console'>(</font>png_structp png_ptr<font face='Lucida Console'>)</font>
<b>{</b>
   png_FILE_p io_ptr;

   <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>png_ptr <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
      <font color='#0000FF'>return</font>;

   io_ptr <font color='#5555FF'>=</font> <font color='#BB00BB'>png_voidcast</font><font face='Lucida Console'>(</font>png_FILE_p, <font face='Lucida Console'>(</font>png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>io_ptr<font face='Lucida Console'>)</font><font face='Lucida Console'>)</font>;
   <font color='#BB00BB'>fflush</font><font face='Lucida Console'>(</font>io_ptr<font face='Lucida Console'>)</font>;
<b>}</b>
#  endif
<font color='#0000FF'>#endif</font>

<font color='#009900'>/* This function allows the application to supply new output functions for
 * libpng if standard C streams aren't being used.
 *
 * This function takes as its arguments:
 * png_ptr       - pointer to a png output data structure
 * io_ptr        - pointer to user supplied structure containing info about
 *                 the output functions.  May be NULL.
 * write_data_fn - pointer to a new output function that takes as its
 *                 arguments a pointer to a png_struct, a pointer to
 *                 data to be written, and a 32-bit unsigned int that is
 *                 the number of bytes to be written.  The new write
 *                 function should call png_error(png_ptr, "Error msg")
 *                 to exit and output any fatal error messages.  May be
 *                 NULL, in which case libpng's default function will
 *                 be used.
 * flush_data_fn - pointer to a new flush function that takes as its
 *                 arguments a pointer to a png_struct.  After a call to
 *                 the flush function, there should be no data in any buffers
 *                 or pending transmission.  If the output method doesn't do
 *                 any buffering of output, a function prototype must still be
 *                 supplied although it doesn't have to do anything.  If
 *                 PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
 *                 time, output_flush_fn will be ignored, although it must be
 *                 supplied for compatibility.  May be NULL, in which case
 *                 libpng's default function will be used, if
 *                 PNG_WRITE_FLUSH_SUPPORTED is defined.  This is not
 *                 a good idea if io_ptr does not point to a standard
 *                 *FILE structure.
 */</font>
<font color='#0000FF'><u>void</u></font> PNGAPI
<b><a name='png_set_write_fn'></a>png_set_write_fn</b><font face='Lucida Console'>(</font>png_structrp png_ptr, png_voidp io_ptr,
    png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn<font face='Lucida Console'>)</font>
<b>{</b>
   <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>png_ptr <font color='#5555FF'>=</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
      <font color='#0000FF'>return</font>;

   png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>io_ptr <font color='#5555FF'>=</font> io_ptr;

<font color='#0000FF'>#ifdef</font> PNG_STDIO_SUPPORTED
   <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>write_data_fn <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
      png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>write_data_fn <font color='#5555FF'>=</font> write_data_fn;

   <font color='#0000FF'>else</font>
      png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>write_data_fn <font color='#5555FF'>=</font> png_default_write_data;
<font color='#0000FF'>#else</font>
   png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>write_data_fn <font color='#5555FF'>=</font> write_data_fn;
<font color='#0000FF'>#endif</font>

<font color='#0000FF'>#ifdef</font> PNG_WRITE_FLUSH_SUPPORTED
#  ifdef PNG_STDIO_SUPPORTED

   <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>output_flush_fn <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
      png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>output_flush_fn <font color='#5555FF'>=</font> output_flush_fn;

   <font color='#0000FF'>else</font>
      png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>output_flush_fn <font color='#5555FF'>=</font> png_default_flush;

#  <font color='#0000FF'>else</font>
   png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>output_flush_fn <font color='#5555FF'>=</font> output_flush_fn;
#  endif
<font color='#0000FF'>#endif</font> <font color='#009900'>/* PNG_WRITE_FLUSH_SUPPORTED */</font>

   <font color='#009900'>/* It is an error to read while writing a png file */</font>
   <font color='#0000FF'>if</font> <font face='Lucida Console'>(</font>png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>read_data_fn <font color='#5555FF'>!</font><font color='#5555FF'>=</font> NULL<font face='Lucida Console'>)</font>
   <b>{</b>
      png_ptr<font color='#5555FF'>-</font><font color='#5555FF'>&gt;</font>read_data_fn <font color='#5555FF'>=</font> NULL;

      <font color='#BB00BB'>png_warning</font><font face='Lucida Console'>(</font>png_ptr,
          "<font color='#CC0000'>Can't set both read_data_fn and write_data_fn in the</font>"
          "<font color='#CC0000'> same structure</font>"<font face='Lucida Console'>)</font>;
   <b>}</b>
<b>}</b>
<font color='#0000FF'>#endif</font> <font color='#009900'>/* PNG_WRITE_SUPPORTED */</font>

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