1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/libpng/pngwio.c	Thu Sep 08 06:28:38 2011 +0300
     1.3 @@ -0,0 +1,234 @@
     1.4 +
     1.5 +/* pngwio.c - functions for data output
     1.6 + *
     1.7 + * Last changed in libpng 1.2.30 [August 15, 2008]
     1.8 + * For conditions of distribution and use, see copyright notice in png.h
     1.9 + * Copyright (c) 1998-2008 Glenn Randers-Pehrson
    1.10 + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
    1.11 + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
    1.12 + *
    1.13 + * This file provides a location for all output.  Users who need
    1.14 + * special handling are expected to write functions that have the same
    1.15 + * arguments as these and perform similar functions, but that possibly
    1.16 + * use different output methods.  Note that you shouldn't change these
    1.17 + * functions, but rather write replacement functions and then change
    1.18 + * them at run time with png_set_write_fn(...).
    1.19 + */
    1.20 +
    1.21 +#define PNG_INTERNAL
    1.22 +#include "png.h"
    1.23 +#ifdef PNG_WRITE_SUPPORTED
    1.24 +
    1.25 +/* Write the data to whatever output you are using.  The default routine
    1.26 +   writes to a file pointer.  Note that this routine sometimes gets called
    1.27 +   with very small lengths, so you should implement some kind of simple
    1.28 +   buffering if you are using unbuffered writes.  This should never be asked
    1.29 +   to write more than 64K on a 16 bit machine.  */
    1.30 +
    1.31 +void /* PRIVATE */
    1.32 +png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
    1.33 +{
    1.34 +   if (png_ptr->write_data_fn != NULL )
    1.35 +      (*(png_ptr->write_data_fn))(png_ptr, data, length);
    1.36 +   else
    1.37 +      png_error(png_ptr, "Call to NULL write function");
    1.38 +}
    1.39 +
    1.40 +#if !defined(PNG_NO_STDIO)
    1.41 +/* This is the function that does the actual writing of data.  If you are
    1.42 +   not writing to a standard C stream, you should create a replacement
    1.43 +   write_data function and use it at run time with png_set_write_fn(), rather
    1.44 +   than changing the library. */
    1.45 +#ifndef USE_FAR_KEYWORD
    1.46 +void PNGAPI
    1.47 +png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
    1.48 +{
    1.49 +   png_uint_32 check;
    1.50 +
    1.51 +   if (png_ptr == NULL) return;
    1.52 +#if defined(_WIN32_WCE)
    1.53 +   if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
    1.54 +      check = 0;
    1.55 +#else
    1.56 +   check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
    1.57 +#endif
    1.58 +   if (check != length)
    1.59 +      png_error(png_ptr, "Write Error");
    1.60 +}
    1.61 +#else
    1.62 +/* this is the model-independent version. Since the standard I/O library
    1.63 +   can't handle far buffers in the medium and small models, we have to copy
    1.64 +   the data.
    1.65 +*/
    1.66 +
    1.67 +#define NEAR_BUF_SIZE 1024
    1.68 +#define MIN(a,b) (a <= b ? a : b)
    1.69 +
    1.70 +void PNGAPI
    1.71 +png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
    1.72 +{
    1.73 +   png_uint_32 check;
    1.74 +   png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
    1.75 +   png_FILE_p io_ptr;
    1.76 +
    1.77 +   if (png_ptr == NULL) return;
    1.78 +   /* Check if data really is near. If so, use usual code. */
    1.79 +   near_data = (png_byte *)CVT_PTR_NOCHECK(data);
    1.80 +   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
    1.81 +   if ((png_bytep)near_data == data)
    1.82 +   {
    1.83 +#if defined(_WIN32_WCE)
    1.84 +      if ( !WriteFile(io_ptr, near_data, length, &check, NULL) )
    1.85 +         check = 0;
    1.86 +#else
    1.87 +      check = fwrite(near_data, 1, length, io_ptr);
    1.88 +#endif
    1.89 +   }
    1.90 +   else
    1.91 +   {
    1.92 +      png_byte buf[NEAR_BUF_SIZE];
    1.93 +      png_size_t written, remaining, err;
    1.94 +      check = 0;
    1.95 +      remaining = length;
    1.96 +      do
    1.97 +      {
    1.98 +         written = MIN(NEAR_BUF_SIZE, remaining);
    1.99 +         png_memcpy(buf, data, written); /* copy far buffer to near buffer */
   1.100 +#if defined(_WIN32_WCE)
   1.101 +         if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
   1.102 +            err = 0;
   1.103 +#else
   1.104 +         err = fwrite(buf, 1, written, io_ptr);
   1.105 +#endif
   1.106 +         if (err != written)
   1.107 +            break;
   1.108 +         else
   1.109 +            check += err;
   1.110 +         data += written;
   1.111 +         remaining -= written;
   1.112 +      }
   1.113 +      while (remaining != 0);
   1.114 +   }
   1.115 +   if (check != length)
   1.116 +      png_error(png_ptr, "Write Error");
   1.117 +}
   1.118 +
   1.119 +#endif
   1.120 +#endif
   1.121 +
   1.122 +/* This function is called to output any data pending writing (normally
   1.123 +   to disk).  After png_flush is called, there should be no data pending
   1.124 +   writing in any buffers. */
   1.125 +#if defined(PNG_WRITE_FLUSH_SUPPORTED)
   1.126 +void /* PRIVATE */
   1.127 +png_flush(png_structp png_ptr)
   1.128 +{
   1.129 +   if (png_ptr->output_flush_fn != NULL)
   1.130 +      (*(png_ptr->output_flush_fn))(png_ptr);
   1.131 +}
   1.132 +
   1.133 +#if !defined(PNG_NO_STDIO)
   1.134 +void PNGAPI
   1.135 +png_default_flush(png_structp png_ptr)
   1.136 +{
   1.137 +#if !defined(_WIN32_WCE)
   1.138 +   png_FILE_p io_ptr;
   1.139 +#endif
   1.140 +   if (png_ptr == NULL) return;
   1.141 +#if !defined(_WIN32_WCE)
   1.142 +   io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
   1.143 +   if (io_ptr != NULL)
   1.144 +      fflush(io_ptr);
   1.145 +#endif
   1.146 +}
   1.147 +#endif
   1.148 +#endif
   1.149 +
   1.150 +/* This function allows the application to supply new output functions for
   1.151 +   libpng if standard C streams aren't being used.
   1.152 +
   1.153 +   This function takes as its arguments:
   1.154 +   png_ptr       - pointer to a png output data structure
   1.155 +   io_ptr        - pointer to user supplied structure containing info about
   1.156 +                   the output functions.  May be NULL.
   1.157 +   write_data_fn - pointer to a new output function that takes as its
   1.158 +                   arguments a pointer to a png_struct, a pointer to
   1.159 +                   data to be written, and a 32-bit unsigned int that is
   1.160 +                   the number of bytes to be written.  The new write
   1.161 +                   function should call png_error(png_ptr, "Error msg")
   1.162 +                   to exit and output any fatal error messages.
   1.163 +   flush_data_fn - pointer to a new flush function that takes as its
   1.164 +                   arguments a pointer to a png_struct.  After a call to
   1.165 +                   the flush function, there should be no data in any buffers
   1.166 +                   or pending transmission.  If the output method doesn't do
   1.167 +                   any buffering of ouput, a function prototype must still be
   1.168 +                   supplied although it doesn't have to do anything.  If
   1.169 +                   PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
   1.170 +                   time, output_flush_fn will be ignored, although it must be
   1.171 +                   supplied for compatibility. */
   1.172 +void PNGAPI
   1.173 +png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
   1.174 +   png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
   1.175 +{
   1.176 +   if (png_ptr == NULL) return;
   1.177 +   png_ptr->io_ptr = io_ptr;
   1.178 +
   1.179 +#if !defined(PNG_NO_STDIO)
   1.180 +   if (write_data_fn != NULL)
   1.181 +      png_ptr->write_data_fn = write_data_fn;
   1.182 +   else
   1.183 +      png_ptr->write_data_fn = png_default_write_data;
   1.184 +#else
   1.185 +   png_ptr->write_data_fn = write_data_fn;
   1.186 +#endif
   1.187 +
   1.188 +#if defined(PNG_WRITE_FLUSH_SUPPORTED)
   1.189 +#if !defined(PNG_NO_STDIO)
   1.190 +   if (output_flush_fn != NULL)
   1.191 +      png_ptr->output_flush_fn = output_flush_fn;
   1.192 +   else
   1.193 +      png_ptr->output_flush_fn = png_default_flush;
   1.194 +#else
   1.195 +   png_ptr->output_flush_fn = output_flush_fn;
   1.196 +#endif
   1.197 +#endif /* PNG_WRITE_FLUSH_SUPPORTED */
   1.198 +
   1.199 +   /* It is an error to read while writing a png file */
   1.200 +   if (png_ptr->read_data_fn != NULL)
   1.201 +   {
   1.202 +      png_ptr->read_data_fn = NULL;
   1.203 +      png_warning(png_ptr,
   1.204 +         "Attempted to set both read_data_fn and write_data_fn in");
   1.205 +      png_warning(png_ptr,
   1.206 +         "the same structure.  Resetting read_data_fn to NULL.");
   1.207 +   }
   1.208 +}
   1.209 +
   1.210 +#if defined(USE_FAR_KEYWORD)
   1.211 +#if defined(_MSC_VER)
   1.212 +void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
   1.213 +{
   1.214 +   void *near_ptr;
   1.215 +   void FAR *far_ptr;
   1.216 +   FP_OFF(near_ptr) = FP_OFF(ptr);
   1.217 +   far_ptr = (void FAR *)near_ptr;
   1.218 +   if (check != 0)
   1.219 +      if (FP_SEG(ptr) != FP_SEG(far_ptr))
   1.220 +         png_error(png_ptr, "segment lost in conversion");
   1.221 +   return(near_ptr);
   1.222 +}
   1.223 +#  else
   1.224 +void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)
   1.225 +{
   1.226 +   void *near_ptr;
   1.227 +   void FAR *far_ptr;
   1.228 +   near_ptr = (void FAR *)ptr;
   1.229 +   far_ptr = (void FAR *)near_ptr;
   1.230 +   if (check != 0)
   1.231 +      if (far_ptr != ptr)
   1.232 +         png_error(png_ptr, "segment lost in conversion");
   1.233 +   return(near_ptr);
   1.234 +}
   1.235 +#   endif
   1.236 +#   endif
   1.237 +#endif /* PNG_WRITE_SUPPORTED */