new file added

[wxWidgets.git] / src / png / pngrio.c

diff --git a/src/png/pngrio.c b/src/png/pngrio.c
index 7adb48f54c940c70beb3346acdc9e512e32ea122..e9c381c5ba41f79eaaae9770cf7f0c7e222d2186 100644 (file)
--- a/src/png/pngrio.c
+++ b/src/png/pngrio.c
@@ -1,134 +1,159 @@
 
 /* pngrio.c - functions for data input
  *
 
 /* pngrio.c - functions for data input
  *

- * libpng 1.0.1
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, Glenn Randers-Pehrson
- * March 15, 1998
+ * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Copyright (c) 1998-2011 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 file provides a location for all input.  Users which need
- * special handling are expected to write a function which has the same
- * arguments as this, and perform a similar function, but possibly has
- * a different input method.  Note that you shouldn't change this
+ * 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 input.  Users who need
+ * special handling are expected to write a function that has the same
+ * arguments as this and performs a similar function, but that possibly
+ * has a different input method.  Note that you shouldn't change this

  * function, but rather write a replacement function and then make
  * libpng use it at run time with png_set_read_fn(...).
  */
 
  * function, but rather write a replacement function and then make
  * libpng use it at run time with png_set_read_fn(...).
  */
 

-#define PNG_INTERNAL
-#include "png.h"
+#include "pngpriv.h"
+
+#ifdef PNG_READ_SUPPORTED

 
 /* Read the data from whatever input you are using.  The default routine
 
 /* Read the data from whatever input you are using.  The default routine

-   reads from 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 reads.  This should never be asked
-   to read more then 64K on a 16 bit machine. */
-void
+ * reads from 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 reads.  This should never be asked
+ * to read more then 64K on a 16 bit machine.
+ */
+void /* PRIVATE */

 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
 png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {

-   png_debug1(4,"reading %d bytes\n", length);
+   png_debug1(4, "reading %d bytes", (int)length);
+

    if (png_ptr->read_data_fn != NULL)
       (*(png_ptr->read_data_fn))(png_ptr, data, length);
    if (png_ptr->read_data_fn != NULL)
       (*(png_ptr->read_data_fn))(png_ptr, data, length);

+

    else
       png_error(png_ptr, "Call to NULL read function");
 }
 
    else
       png_error(png_ptr, "Call to NULL read function");
 }
 

-#if !defined(PNG_NO_STDIO)
-/* This is the function which does the actual reading of data.  If you are
-   not reading from a standard C stream, you should create a replacement
-   read_data function and use it at run time with png_set_read_fn(), rather
-   than changing the library. */
-#ifndef USE_FAR_KEYWORD
-static void
+#ifdef PNG_STDIO_SUPPORTED
+/* This is the function that does the actual reading of data.  If you are
+ * not reading from a standard C stream, you should create a replacement
+ * read_data function and use it at run time with png_set_read_fn(), rather
+ * than changing the library.
+ */
+#  ifndef USE_FAR_KEYWORD
+void PNGCBAPI

 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_size_t check;
 
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_size_t check;
 

+   if (png_ptr == NULL)
+      return;
+

    /* fread() returns 0 on error, so it is OK to store this in a png_size_t
     * instead of an int, which is what fread() actually returns.
     */
    /* fread() returns 0 on error, so it is OK to store this in a png_size_t
     * instead of an int, which is what fread() actually returns.
     */

-   check = (png_size_t)fread(data, (png_size_t)1, length,
-      (FILE *)png_ptr->io_ptr);
+   check = fread(data, 1, length, (png_FILE_p)png_ptr->io_ptr);

 
    if (check != length)
 
    if (check != length)

-   {

       png_error(png_ptr, "Read Error");
       png_error(png_ptr, "Read Error");

-   }

 }
 }

-#else
-/* this is the model-independent version. Since the standard I/O library
+#  else
+/* This is the model-independent version. Since the standard I/O library

    can't handle far buffers in the medium and small models, we have to copy
    the data.
 */
    can't handle far buffers in the medium and small models, we have to copy
    the data.
 */

- 
+

 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)

- 
-static void
+
+static void PNGCBAPI

 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {

-   int check;
+   png_size_t check;

    png_byte *n_data;
    png_byte *n_data;

-   FILE *io_ptr;
+   png_FILE_p io_ptr;
+
+   if (png_ptr == NULL)
+      return;

 
    /* Check if data really is near. If so, use usual code. */
    n_data = (png_byte *)CVT_PTR_NOCHECK(data);
 
    /* Check if data really is near. If so, use usual code. */
    n_data = (png_byte *)CVT_PTR_NOCHECK(data);

-   io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+   io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
+

    if ((png_bytep)n_data == data)
    {
       check = fread(n_data, 1, length, io_ptr);
    }
    if ((png_bytep)n_data == data)
    {
       check = fread(n_data, 1, length, io_ptr);
    }

+

    else
    {
       png_byte buf[NEAR_BUF_SIZE];
       png_size_t read, remaining, err;
       check = 0;
       remaining = length;
    else
    {
       png_byte buf[NEAR_BUF_SIZE];
       png_size_t read, remaining, err;
       check = 0;
       remaining = length;

+

       do
       {
          read = MIN(NEAR_BUF_SIZE, remaining);
       do
       {
          read = MIN(NEAR_BUF_SIZE, remaining);

-         err = fread(buf, (png_size_t)1, read, io_ptr);
+         err = fread(buf, 1, read, io_ptr);

          png_memcpy(data, buf, read); /* copy far buffer to near buffer */
          png_memcpy(data, buf, read); /* copy far buffer to near buffer */

-         if(err != read)
+
+         if (err != read)

             break;
             break;

+

          else
             check += err;
          else
             check += err;

+

          data += read;
          remaining -= read;
       }
       while (remaining != 0);
    }
          data += read;
          remaining -= read;
       }
       while (remaining != 0);
    }

+

    if ((png_uint_32)check != (png_uint_32)length)
    if ((png_uint_32)check != (png_uint_32)length)

-   {

       png_error(png_ptr, "read Error");
       png_error(png_ptr, "read Error");

-   }

 }
 }

-#endif
+#  endif

 #endif
 
 /* This function allows the application to supply a new input function
 #endif
 
 /* This function allows the application to supply a new input function

-   for libpng if standard C streams aren't being used.
-
-   This function takes as its arguments:
-   png_ptr      - pointer to a png input data structure
-   io_ptr       - pointer to user supplied structure containing info about
-                  the input functions.  May be NULL.
-   read_data_fn - pointer to a new input function which takes as it's
-                  arguments a pointer to a png_struct, a pointer to
-                  a location where input data can be stored, and a 32-bit
-                  unsigned int which is the number of bytes to be read.
-                  To exit and output any fatal error messages the new write
-                  function should call png_error(png_ptr, "Error msg"). */
-void
+ * for libpng if standard C streams aren't being used.
+ *
+ * This function takes as its arguments:
+ *
+ * png_ptr      - pointer to a png input data structure
+ *
+ * io_ptr       - pointer to user supplied structure containing info about
+ *                the input functions.  May be NULL.
+ *
+ * read_data_fn - pointer to a new input function that takes as its
+ *                arguments a pointer to a png_struct, a pointer to
+ *                a location where input data can be stored, and a 32-bit
+ *                unsigned int that is the number of bytes to be read.
+ *                To exit and output any fatal error messages the new write
+ *                function should call png_error(png_ptr, "Error msg").
+ *                May be NULL, in which case libpng's default function will
+ *                be used.
+ */
+void PNGAPI

 png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr read_data_fn)
 {
 png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr read_data_fn)
 {

+   if (png_ptr == NULL)
+      return;
+

    png_ptr->io_ptr = io_ptr;
 
    png_ptr->io_ptr = io_ptr;
 

-#if !defined(PNG_NO_STDIO)
+#ifdef PNG_STDIO_SUPPORTED

    if (read_data_fn != NULL)
       png_ptr->read_data_fn = read_data_fn;
    if (read_data_fn != NULL)
       png_ptr->read_data_fn = read_data_fn;

+

    else
       png_ptr->read_data_fn = png_default_read_data;
 #else
    else
       png_ptr->read_data_fn = png_default_read_data;
 #else


@@ -136,10 +161,16 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
 #endif
 
    /* It is an error to write to a read device */
 #endif
 
    /* It is an error to write to a read device */

-   png_ptr->write_data_fn = NULL;
+   if (png_ptr->write_data_fn != NULL)
+   {
+      png_ptr->write_data_fn = NULL;
+      png_warning(png_ptr,
+          "Can't set both read_data_fn and write_data_fn in the"
+          " same structure");
+   }

 
 

-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
+#ifdef PNG_WRITE_FLUSH_SUPPORTED

    png_ptr->output_flush_fn = NULL;
    png_ptr->output_flush_fn = NULL;

-#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+#endif

 }
 }

-
+#endif /* PNG_READ_SUPPORTED */