update window before changing the scrolling position and really scrolling it to avoid...

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

diff --git a/src/png/pngrio.c b/src/png/pngrio.c
index 7adb48f54c940c70beb3346acdc9e512e32ea122..806f7919816199ee870b6420f6fa426d0207c712 100644 (file)
--- a/src/png/pngrio.c
+++ b/src/png/pngrio.c
@@ -1,17 +1,16 @@
 
 /* pngrio.c - functions for data input
  *
 
 /* pngrio.c - functions for data input
  *

- * libpng 1.0.1
+ * libpng 1.2.7 - September 12, 2004

  * For conditions of distribution and use, see copyright notice in png.h
  * 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
+ * Copyright (c) 1998-2004 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 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(...).
  */


@@ -24,10 +23,10 @@
    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. */
    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
+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\n", (int)length);

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


@@ -35,12 +34,12 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 }
 
 #if !defined(PNG_NO_STDIO)
 }
 
 #if !defined(PNG_NO_STDIO)

-/* This is the function which does the actual reading of data.  If you are
+/* 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
    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
+void PNGAPI

 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;


@@ -48,36 +47,44 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
    /* 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.
     */

+#if defined(_WIN32_WCE)
+   if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+      check = 0;
+#else

    check = (png_size_t)fread(data, (png_size_t)1, length,
    check = (png_size_t)fread(data, (png_size_t)1, length,

-      (FILE *)png_ptr->io_ptr);
+      (png_FILE_p)png_ptr->io_ptr);
+#endif

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

- 
+

 #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 /* PRIVATE */

 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    int check;
    png_byte *n_data;
 png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    int check;
    png_byte *n_data;

-   FILE *io_ptr;
+   png_FILE_p io_ptr;

 
    /* 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)
    {
    if ((png_bytep)n_data == data)
    {

+#if defined(_WIN32_WCE)
+      if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+         check = 0;
+#else

       check = fread(n_data, 1, length, io_ptr);
       check = fread(n_data, 1, length, io_ptr);

+#endif

    }
    else
    {
    }
    else
    {


@@ -88,7 +95,12 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       do
       {
          read = MIN(NEAR_BUF_SIZE, remaining);
       do
       {
          read = MIN(NEAR_BUF_SIZE, remaining);

+#if defined(_WIN32_WCE)
+         if ( !ReadFile((HANDLE)(io_ptr), buf, read, &err, NULL) )
+            err = 0;
+#else

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

+#endif

          png_memcpy(data, buf, read); /* copy far buffer to near buffer */
          if(err != read)
             break;
          png_memcpy(data, buf, read); /* copy far buffer to near buffer */
          if(err != read)
             break;


@@ -100,9 +112,7 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
       while (remaining != 0);
    }
    if ((png_uint_32)check != (png_uint_32)length)
       while (remaining != 0);
    }
    if ((png_uint_32)check != (png_uint_32)length)

-   {

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

-   }

 }
 #endif
 #endif
 }
 #endif
 #endif


@@ -114,13 +124,13 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
    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.
    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
+   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
                   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.
+                  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"). */
                   To exit and output any fatal error messages the new write
                   function should call png_error(png_ptr, "Error msg"). */

-void
+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)
 {


@@ -136,10 +146,16 @@ 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,
+         "It's an error to set both read_data_fn and write_data_fn in the ");
+      png_warning(png_ptr,
+         "same structure.  Resetting write_data_fn to NULL.");
+   }

 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
    png_ptr->output_flush_fn = NULL;
 
 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
    png_ptr->output_flush_fn = NULL;

-#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+#endif

 }
 }

-