X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/2b5f62a0b2db198609b45dec622a018dae37008e..7d6a4d96961eac84d05db8bb24c64d39003f6e54:/src/png/pngrio.c

diff --git a/src/png/pngrio.c b/src/png/pngrio.c
index d88324a49b..e9c381c5ba 100644
--- a/src/png/pngrio.c
+++ b/src/png/pngrio.c
@@ -1,12 +1,15 @@
 
 /* pngrio.c - functions for data input
  *
- * libpng 1.2.5rc3 - September 18, 2002
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * 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 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
@@ -15,51 +18,53 @@
  * 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
-   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. */
+ * 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_debug1(4,"reading %d bytes\n", (int)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);
+
    else
       png_error(png_ptr, "Call to NULL read function");
 }
 
-#if !defined(PNG_NO_STDIO)
+#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 PNGAPI
+ * 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;
 
+   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.
     */
-#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,
-      (png_FILE_p)png_ptr->io_ptr);
-#endif
+   check = fread(data, 1, length, (png_FILE_p)png_ptr->io_ptr);
 
    if (check != length)
       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.
 */
@@ -67,78 +72,88 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
 #define NEAR_BUF_SIZE 1024
 #define MIN(a,b) (a <= b ? a : b)
 
-static void /* PRIVATE */
+static void PNGCBAPI
 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_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);
    io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
+
    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);
-#endif
    }
+
    else
    {
       png_byte buf[NEAR_BUF_SIZE];
       png_size_t read, remaining, err;
       check = 0;
       remaining = length;
+
       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);
-#endif
+         err = fread(buf, 1, read, io_ptr);
          png_memcpy(data, buf, read); /* copy far buffer to near buffer */
-         if(err != read)
+
+         if (err != read)
             break;
+
          else
             check += err;
+
          data += read;
          remaining -= read;
       }
       while (remaining != 0);
    }
+
    if ((png_uint_32)check != (png_uint_32)length)
       png_error(png_ptr, "read Error");
 }
-#endif
+#  endif
 #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 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"). */
+ * 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)
 {
+   if (png_ptr == NULL)
+      return;
+
    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;
+
    else
       png_ptr->read_data_fn = png_default_read_data;
 #else
@@ -150,12 +165,12 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
    {
       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.");
+          "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;
 #endif
 }
+#endif /* PNG_READ_SUPPORTED */