Merge in from trunk r64802 - r68625

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

diff --git a/src/png/pngwio.c b/src/png/pngwio.c
index 444a123b58c13a8ab96cd60e38c8bfdea36521af..513a71a06222ad42cb0e1e9513c550c37cbc5dd4 100644 (file)
--- a/src/png/pngwio.c
+++ b/src/png/pngwio.c
@@ -1,31 +1,36 @@
 
 /* pngwio.c - functions for data output
  *
 
 /* pngwio.c - functions for data output
  *

- * 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 1.4.0 [January 3, 2010]
+ * Copyright (c) 1998-2010 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 output.  Users which need
- * special handling are expected to write functions which have the same
- * arguments as these, and perform similar functions, but possibly use
- * different output methods.  Note that you shouldn't change these
+ * 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 output.  Users who need
+ * special handling are expected to write functions that have the same
+ * arguments as these and perform similar functions, but that possibly
+ * use different output methods.  Note that you shouldn't change these

  * functions, but rather write replacement functions and then change
  * them at run time with png_set_write_fn(...).
  */
 
  * functions, but rather write replacement functions and then change
  * them at run time with png_set_write_fn(...).
  */
 

-#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS

 #include "png.h"
 #include "png.h"

+#ifdef PNG_WRITE_SUPPORTED
+#include "pngpriv.h"

 
 /* Write the data to whatever output you are using.  The default routine
 
 /* Write the data to whatever output you are using.  The default routine

-   writes to 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 writes.  This should never be asked
-   to write more then 64K on a 16 bit machine.  */
+ * writes to 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 writes.  This should never be asked
+ * to write more than 64K on a 16 bit machine.
+ */

 
 

-void
+void /* PRIVATE */

 png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    if (png_ptr->write_data_fn != NULL )
 png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    if (png_ptr->write_data_fn != NULL )


@@ -34,42 +39,45 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       png_error(png_ptr, "Call to NULL write function");
 }
 
       png_error(png_ptr, "Call to NULL write function");
 }
 

-#if !defined(PNG_NO_STDIO)
-/* This is the function which does the actual writing of data.  If you are
-   not writing to a standard C stream, you should create a replacement
-   write_data function and use it at run time with png_set_write_fn(), rather
-   than changing the library. */
+#ifdef PNG_STDIO_SUPPORTED
+/* This is the function that does the actual writing of data.  If you are
+ * not writing to a standard C stream, you should create a replacement
+ * write_data function and use it at run time with png_set_write_fn(), rather
+ * than changing the library.
+ */

 #ifndef USE_FAR_KEYWORD
 #ifndef USE_FAR_KEYWORD

-static void
+void PNGAPI

 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
 
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
 

-   check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+   if (png_ptr == NULL)
+      return;
+   check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));

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

-   {

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

-   }

 }
 #else
 }
 #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.
-*/
+/* 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
+void PNGAPI

 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
    png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */
 png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
 {
    png_uint_32 check;
    png_byte *near_data;  /* Needs to be "png_byte *" instead of "png_bytep" */

-   FILE *io_ptr;
+   png_FILE_p io_ptr;

 
 

+   if (png_ptr == NULL)
+      return;

    /* Check if data really is near. If so, use usual code. */
    near_data = (png_byte *)CVT_PTR_NOCHECK(data);
    /* Check if data really is near. If so, use usual code. */
    near_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)near_data == data)
    {
       check = fwrite(near_data, 1, length, io_ptr);
    if ((png_bytep)near_data == data)
    {
       check = fwrite(near_data, 1, length, io_ptr);


@@ -83,90 +91,104 @@ png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
       do
       {
          written = MIN(NEAR_BUF_SIZE, remaining);
       do
       {
          written = MIN(NEAR_BUF_SIZE, remaining);

-         png_memcpy(buf, data, written); /* copy far buffer to near buffer */
+         png_memcpy(buf, data, written); /* Copy far buffer to near buffer */

          err = fwrite(buf, 1, written, io_ptr);
          if (err != written)
             break;
          err = fwrite(buf, 1, written, io_ptr);
          if (err != written)
             break;

+

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

+

          data += written;
          remaining -= written;
       }
       while (remaining != 0);
    }
    if (check != length)
          data += written;
          remaining -= written;
       }
       while (remaining != 0);
    }
    if (check != length)

-   {

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

-   }

 }
 
 #endif
 #endif
 
 /* This function is called to output any data pending writing (normally
 }
 
 #endif
 #endif
 
 /* This function is called to output any data pending writing (normally

-   to disk).  After png_flush is called, there should be no data pending
-   writing in any buffers. */
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
-void
+ * to disk).  After png_flush is called, there should be no data pending
+ * writing in any buffers.
+ */
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+void /* PRIVATE */

 png_flush(png_structp png_ptr)
 {
    if (png_ptr->output_flush_fn != NULL)
       (*(png_ptr->output_flush_fn))(png_ptr);
 }
 
 png_flush(png_structp png_ptr)
 {
    if (png_ptr->output_flush_fn != NULL)
       (*(png_ptr->output_flush_fn))(png_ptr);
 }
 

-#if !defined(PNG_NO_STDIO)
-static void
+#ifdef PNG_STDIO_SUPPORTED
+void PNGAPI

 png_default_flush(png_structp png_ptr)
 {
 png_default_flush(png_structp png_ptr)
 {

-   FILE *io_ptr;
-   io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
-   if (io_ptr != NULL)
-      fflush(io_ptr);
+   png_FILE_p io_ptr;
+   if (png_ptr == NULL)
+      return;
+   io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
+   fflush(io_ptr);

 }
 #endif
 #endif
 
 /* This function allows the application to supply new output functions for
 }
 #endif
 #endif
 
 /* This function allows the application to supply new output functions for

-   libpng if standard C streams aren't being used.
-
-   This function takes as its arguments:
-   png_ptr       - pointer to a png output data structure
-   io_ptr        - pointer to user supplied structure containing info about
-                   the output functions.  May be NULL.
-   write_data_fn - pointer to a new output function which takes as its
-                   arguments a pointer to a png_struct, a pointer to
-                   data to be written, and a 32-bit unsigned int which is
-                   the number of bytes to be written.  The new write
-                   function should call png_error(png_ptr, "Error msg")
-                   to exit and output any fatal error messages.
-   flush_data_fn - pointer to a new flush function which takes as its
-                   arguments a pointer to a png_struct.  After a call to
-                   the flush function, there should be no data in any buffers
-                   or pending transmission.  If the output method doesn't do
-                   any buffering of ouput, a function prototype must still be
-                   supplied although it doesn't have to do anything.  If
-                   PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
-                   time, output_flush_fn will be ignored, although it must be
-                   supplied for compatibility. */
-void
+ * libpng if standard C streams aren't being used.
+ *
+ * This function takes as its arguments:
+ * png_ptr       - pointer to a png output data structure
+ * io_ptr        - pointer to user supplied structure containing info about
+ *                 the output functions.  May be NULL.
+ * write_data_fn - pointer to a new output function that takes as its
+ *                 arguments a pointer to a png_struct, a pointer to
+ *                 data to be written, and a 32-bit unsigned int that is
+ *                 the number of bytes to be written.  The new write
+ *                 function should call png_error(png_ptr, "Error msg")
+ *                 to exit and output any fatal error messages.  May be
+ *                 NULL, in which case libpng's default function will
+ *                 be used.
+ * flush_data_fn - pointer to a new flush function that takes as its
+ *                 arguments a pointer to a png_struct.  After a call to
+ *                 the flush function, there should be no data in any buffers
+ *                 or pending transmission.  If the output method doesn't do
+ *                 any buffering of output, a function prototype must still be
+ *                 supplied although it doesn't have to do anything.  If
+ *                 PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
+ *                 time, output_flush_fn will be ignored, although it must be
+ *                 supplied for compatibility.  May be NULL, in which case
+ *                 libpng's default function will be used, if
+ *                 PNG_WRITE_FLUSH_SUPPORTED is defined.  This is not
+ *                 a good idea if io_ptr does not point to a standard
+ *                 *FILE structure.
+ */
+void PNGAPI

 png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
 {
 png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
    png_rw_ptr write_data_fn, png_flush_ptr output_flush_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 (write_data_fn != NULL)
       png_ptr->write_data_fn = write_data_fn;
    if (write_data_fn != NULL)
       png_ptr->write_data_fn = write_data_fn;

+

    else
       png_ptr->write_data_fn = png_default_write_data;
 #else
    png_ptr->write_data_fn = write_data_fn;
 #endif
 
    else
       png_ptr->write_data_fn = png_default_write_data;
 #else
    png_ptr->write_data_fn = write_data_fn;
 #endif
 

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

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

+

    else
       png_ptr->output_flush_fn = png_default_flush;
 #else
    else
       png_ptr->output_flush_fn = png_default_flush;
 #else


@@ -175,33 +197,45 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 
    /* It is an error to read while writing a png file */
 #endif /* PNG_WRITE_FLUSH_SUPPORTED */
 
    /* It is an error to read while writing a png file */

-   png_ptr->read_data_fn = NULL;
+   if (png_ptr->read_data_fn != NULL)
+   {
+      png_ptr->read_data_fn = NULL;
+      png_warning(png_ptr,
+         "Attempted to set both read_data_fn and write_data_fn in");
+      png_warning(png_ptr,
+         "the same structure.  Resetting read_data_fn to NULL");
+   }

 }
 
 }
 

-#if defined(USE_FAR_KEYWORD) 
-#if defined(_MSC_VER)   
-void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
+#ifdef USE_FAR_KEYWORD
+#ifdef _MSC_VER
+void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)

 {
 {

-   void *near_ptr;   
+   void *near_ptr;

    void FAR *far_ptr;
    FP_OFF(near_ptr) = FP_OFF(ptr);
    far_ptr = (void FAR *)near_ptr;
    void FAR *far_ptr;
    FP_OFF(near_ptr) = FP_OFF(ptr);
    far_ptr = (void FAR *)near_ptr;

-   if(check != 0)
-      if(FP_SEG(ptr) != FP_SEG(far_ptr))
-         png_error(png_ptr,"segment lost in conversion");
+
+   if (check != 0)
+      if (FP_SEG(ptr) != FP_SEG(far_ptr))
+         png_error(png_ptr, "segment lost in conversion");
+

    return(near_ptr);
 }
 #  else
    return(near_ptr);
 }
 #  else

-void *png_far_to_near(png_structp png_ptr,png_voidp ptr, int check)
+void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check)

 {
 {

-   void *near_ptr;   
+   void *near_ptr;

    void FAR *far_ptr;
    near_ptr = (void FAR *)ptr;
    far_ptr = (void FAR *)near_ptr;
    void FAR *far_ptr;
    near_ptr = (void FAR *)ptr;
    far_ptr = (void FAR *)near_ptr;

-   if(check != 0)
-      if(far_ptr != ptr)
-         png_error(png_ptr,"segment lost in conversion");
+
+   if (check != 0)
+      if (far_ptr != ptr)
+         png_error(png_ptr, "segment lost in conversion");
+

    return(near_ptr);
 }
 #   endif
 #   endif
    return(near_ptr);
 }
 #   endif
 #   endif

+#endif /* PNG_WRITE_SUPPORTED */