symbian-qemu-0.9.1-12/libpng-1.2.32/pngrio.c
author martin.trojer@nokia.com
Fri, 31 Jul 2009 15:01:17 +0100
changeset 1 2fb8b9db1c86
permissions -rw-r--r--
Initial QEMU (symbian-qemu-0.9.1-12) import
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/* pngrio.c - functions for data input
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 *
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 * Last changed in libpng 1.2.30 [August 15, 2008]
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 * For conditions of distribution and use, see copyright notice in png.h
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 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
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 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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 *
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 * This file provides a location for all input.  Users who need
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 * special handling are expected to write a function that has the same
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 * arguments as this and performs a similar function, but that possibly
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 * has a different input method.  Note that you shouldn't change this
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 * function, but rather write a replacement function and then make
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 * libpng use it at run time with png_set_read_fn(...).
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 */
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#define PNG_INTERNAL
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#include "png.h"
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#if defined(PNG_READ_SUPPORTED)
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/* Read the data from whatever input you are using.  The default routine
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   reads from a file pointer.  Note that this routine sometimes gets called
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   with very small lengths, so you should implement some kind of simple
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   buffering if you are using unbuffered reads.  This should never be asked
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   to read more then 64K on a 16 bit machine. */
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void /* PRIVATE */
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png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
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{
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   png_debug1(4, "reading %d bytes\n", (int)length);
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   if (png_ptr->read_data_fn != NULL)
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      (*(png_ptr->read_data_fn))(png_ptr, data, length);
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   else
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      png_error(png_ptr, "Call to NULL read function");
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}
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#if !defined(PNG_NO_STDIO)
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/* This is the function that does the actual reading of data.  If you are
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   not reading from a standard C stream, you should create a replacement
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   read_data function and use it at run time with png_set_read_fn(), rather
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   than changing the library. */
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#ifndef USE_FAR_KEYWORD
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void PNGAPI
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png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
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{
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   png_size_t check;
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   if (png_ptr == NULL) return;
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   /* fread() returns 0 on error, so it is OK to store this in a png_size_t
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    * instead of an int, which is what fread() actually returns.
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    */
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#if defined(_WIN32_WCE)
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   if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
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      check = 0;
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#else
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   check = (png_size_t)fread(data, (png_size_t)1, length,
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      (png_FILE_p)png_ptr->io_ptr);
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#endif
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   if (check != length)
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      png_error(png_ptr, "Read Error");
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}
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#else
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/* this is the model-independent version. Since the standard I/O library
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   can't handle far buffers in the medium and small models, we have to copy
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   the data.
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*/
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#define NEAR_BUF_SIZE 1024
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#define MIN(a,b) (a <= b ? a : b)
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static void PNGAPI
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png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
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{
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   int check;
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   png_byte *n_data;
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   png_FILE_p io_ptr;
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   if (png_ptr == NULL) return;
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   /* Check if data really is near. If so, use usual code. */
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   n_data = (png_byte *)CVT_PTR_NOCHECK(data);
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   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
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   if ((png_bytep)n_data == data)
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   {
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#if defined(_WIN32_WCE)
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      if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
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         check = 0;
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#else
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      check = fread(n_data, 1, length, io_ptr);
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#endif
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   }
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   else
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   {
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      png_byte buf[NEAR_BUF_SIZE];
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      png_size_t read, remaining, err;
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      check = 0;
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      remaining = length;
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      do
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      {
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         read = MIN(NEAR_BUF_SIZE, remaining);
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#if defined(_WIN32_WCE)
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         if ( !ReadFile((HANDLE)(io_ptr), buf, read, &err, NULL) )
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            err = 0;
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#else
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         err = fread(buf, (png_size_t)1, read, io_ptr);
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#endif
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         png_memcpy(data, buf, read); /* copy far buffer to near buffer */
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         if (err != read)
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            break;
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         else
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            check += err;
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         data += read;
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         remaining -= read;
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      }
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      while (remaining != 0);
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   }
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   if ((png_uint_32)check != (png_uint_32)length)
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      png_error(png_ptr, "read Error");
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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#endif
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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/* This function allows the application to supply a new input function
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   for libpng if standard C streams aren't being used.
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   This function takes as its arguments:
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   png_ptr      - pointer to a png input data structure
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   io_ptr       - pointer to user supplied structure containing info about
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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                  the input functions.  May be NULL.
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   read_data_fn - pointer to a new input function that takes as its
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   131
                  arguments a pointer to a png_struct, a pointer to
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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                  a location where input data can be stored, and a 32-bit
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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                  unsigned int that is the number of bytes to be read.
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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                  To exit and output any fatal error messages the new write
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   135
                  function should call png_error(png_ptr, "Error msg"). */
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   136
void PNGAPI
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   138
   png_rw_ptr read_data_fn)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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{
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   140
   if (png_ptr == NULL) return;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   png_ptr->io_ptr = io_ptr;
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   142
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   143
#if !defined(PNG_NO_STDIO)
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   144
   if (read_data_fn != NULL)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   145
      png_ptr->read_data_fn = read_data_fn;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   146
   else
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   147
      png_ptr->read_data_fn = png_default_read_data;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   148
#else
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   149
   png_ptr->read_data_fn = read_data_fn;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   150
#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   151
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   152
   /* It is an error to write to a read device */
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   153
   if (png_ptr->write_data_fn != NULL)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   154
   {
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   155
      png_ptr->write_data_fn = NULL;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   156
      png_warning(png_ptr,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   157
         "It's an error to set both read_data_fn and write_data_fn in the ");
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   158
      png_warning(png_ptr,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
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   159
         "same structure.  Resetting write_data_fn to NULL.");
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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   160
   }
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   161
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   162
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   163
   png_ptr->output_flush_fn = NULL;
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff changeset
   164
#endif
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
martin.trojer@nokia.com
parents:
diff changeset
   165
}
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   166
#endif /* PNG_READ_SUPPORTED */