Use libpng from sourcetree instead of the one supplied by the OS.

1 files changed, 667 insertions, 0 deletions

diff --git a/plugingui/png/pngmem.c b/plugingui/png/pngmem.c
new file mode 100644
index 0000000..f885533
--- /dev/null
+++ b/plugingui/png/pngmem.c
@@ -0,0 +1,667 @@
+
+/* pngmem.c - stub functions for memory allocation
+ *
+ * Last changed in libpng 1.5.13 [September 27, 2012]
+ * Copyright (c) 1998-2012 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 memory allocation.  Users who
+ * need special memory handling are expected to supply replacement
+ * functions for png_malloc() and png_free(), and to use
+ * png_create_read_struct_2() and png_create_write_struct_2() to
+ * identify the replacement functions.
+ */
+
+#include "pngpriv.h"
+
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+
+/* Borland DOS special memory handler */
+#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
+/* If you change this, be sure to change the one in png.h also */
+
+/* Allocate memory for a png_struct.  The malloc and memset can be replaced
+   by a single call to calloc() if this is thought to improve performance. */
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct,(int type),PNG_ALLOCATED)
+{
+#  ifdef PNG_USER_MEM_SUPPORTED
+   return (png_create_struct_2(type, NULL, NULL));
+}
+
+/* Alternate version of png_create_struct, for use with user-defined malloc. */
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
+   PNG_ALLOCATED)
+{
+#  endif /* PNG_USER_MEM_SUPPORTED */
+   png_size_t size;
+   png_voidp struct_ptr;
+
+   if (type == PNG_STRUCT_INFO)
+      size = png_sizeof(png_info);
+
+   else if (type == PNG_STRUCT_PNG)
+      size = png_sizeof(png_struct);
+
+   else
+      return (png_get_copyright(NULL));
+
+#  ifdef PNG_USER_MEM_SUPPORTED
+   if (malloc_fn != NULL)
+   {
+      png_struct dummy_struct;
+      png_memset(&dummy_struct, 0, sizeof dummy_struct);
+      dummy_struct.mem_ptr=mem_ptr;
+      struct_ptr = (*(malloc_fn))(&dummy_struct, (png_alloc_size_t)size);
+   }
+
+   else
+#  endif /* PNG_USER_MEM_SUPPORTED */
+   struct_ptr = (png_voidp)farmalloc(size);
+   if (struct_ptr != NULL)
+      png_memset(struct_ptr, 0, size);
+
+   return (struct_ptr);
+}
+
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct(png_voidp struct_ptr)
+{
+#  ifdef PNG_USER_MEM_SUPPORTED
+   png_destroy_struct_2(struct_ptr, NULL, NULL);
+}
+
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+    png_voidp mem_ptr)
+{
+#  endif
+   if (struct_ptr != NULL)
+   {
+#  ifdef PNG_USER_MEM_SUPPORTED
+      if (free_fn != NULL)
+      {
+         png_struct dummy_struct;
+         png_memset(&dummy_struct, 0, sizeof dummy_struct);
+         dummy_struct.mem_ptr=mem_ptr;
+         (*(free_fn))(&dummy_struct, struct_ptr);
+         return;
+      }
+
+#  endif /* PNG_USER_MEM_SUPPORTED */
+      farfree (struct_ptr);
+   }
+}
+
+/* Allocate memory.  For reasonable files, size should never exceed
+ * 64K.  However, zlib may allocate more then 64K if you don't tell
+ * it not to.  See zconf.h and png.h for more information. zlib does
+ * need to allocate exactly 64K, so whatever you call here must
+ * have the ability to do that.
+ *
+ * Borland seems to have a problem in DOS mode for exactly 64K.
+ * It gives you a segment with an offset of 8 (perhaps to store its
+ * memory stuff).  zlib doesn't like this at all, so we have to
+ * detect and deal with it.  This code should not be needed in
+ * Windows or OS/2 modes, and only in 16 bit mode.  This code has
+ * been updated by Alexander Lehmann for version 0.89 to waste less
+ * memory.
+ *
+ * Note that we can't use png_size_t for the "size" declaration,
+ * since on some systems a png_size_t is a 16-bit quantity, and as a
+ * result, we would be truncating potentially larger memory requests
+ * (which should cause a fatal error) and introducing major problems.
+ */
+PNG_FUNCTION(png_voidp,PNGAPI
+png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
+{
+   png_voidp ret;
+
+   ret = (png_malloc(png_ptr, size));
+
+   if (ret != NULL)
+      png_memset(ret,0,(png_size_t)size);
+
+   return (ret);
+}
+
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
+{
+   png_voidp ret;
+
+   if (png_ptr == NULL || size == 0)
+      return (NULL);
+
+#  ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr->malloc_fn != NULL)
+      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+
+   else
+      ret = (png_malloc_default(png_ptr, size));
+
+   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+       png_error(png_ptr, "Out of memory");
+
+   return (ret);
+}
+
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
+{
+   png_voidp ret;
+#  endif /* PNG_USER_MEM_SUPPORTED */
+
+   if (png_ptr == NULL || size == 0)
+      return (NULL);
+
+#  ifdef PNG_MAX_MALLOC_64K
+   if (size > (png_uint_32)65536L)
+   {
+      png_warning(png_ptr, "Cannot Allocate > 64K");
+      ret = NULL;
+   }
+
+   else
+#  endif
+
+   if (size != (size_t)size)
+      ret = NULL;
+
+   else if (size == (png_uint_32)65536L)
+   {
+      if (png_ptr->offset_table == NULL)
+      {
+         /* Try to see if we need to do any of this fancy stuff */
+         ret = farmalloc(size);
+         if (ret == NULL || ((png_size_t)ret & 0xffff))
+         {
+            int num_blocks;
+            png_uint_32 total_size;
+            png_bytep table;
+            int i, mem_level, window_bits;
+            png_byte huge * hptr;
+            int window_bits
+
+            if (ret != NULL)
+            {
+               farfree(ret);
+               ret = NULL;
+            }
+
+            window_bits =
+                png_ptr->zlib_window_bits >= png_ptr->zlib_text_window_bits ?
+                png_ptr->zlib_window_bits : png_ptr->zlib_text_window_bits;
+
+            if (window_bits > 14)
+               num_blocks = (int)(1 << (window_bits - 14));
+
+            else
+               num_blocks = 1;
+
+            mem_level =
+                png_ptr->zlib_mem_level >= png_ptr->zlib_text_mem_level ?
+                png_ptr->zlib_mem_level : png_ptr->zlib_text_mem_level;
+
+            if (mem_level >= 7)
+               num_blocks += (int)(1 << (mem_level - 7));
+
+            else
+               num_blocks++;
+
+            total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16;
+
+            table = farmalloc(total_size);
+
+            if (table == NULL)
+            {
+#  ifndef PNG_USER_MEM_SUPPORTED
+               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr, "Out Of Memory"); /* Note "O", "M" */
+
+               else
+                  png_warning(png_ptr, "Out Of Memory");
+#  endif
+               return (NULL);
+            }
+
+            if ((png_size_t)table & 0xfff0)
+            {
+#  ifndef PNG_USER_MEM_SUPPORTED
+               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr,
+                    "Farmalloc didn't return normalized pointer");
+
+               else
+                  png_warning(png_ptr,
+                    "Farmalloc didn't return normalized pointer");
+#  endif
+               return (NULL);
+            }
+
+            png_ptr->offset_table = table;
+            png_ptr->offset_table_ptr = farmalloc(num_blocks *
+               png_sizeof(png_bytep));
+
+            if (png_ptr->offset_table_ptr == NULL)
+            {
+#  ifndef PNG_USER_MEM_SUPPORTED
+               if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+                  png_error(png_ptr, "Out Of memory"); /* Note "O", "m" */
+
+               else
+                  png_warning(png_ptr, "Out Of memory");
+#  endif
+               return (NULL);
+            }
+
+            hptr = (png_byte huge *)table;
+            if ((png_size_t)hptr & 0xf)
+            {
+               hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
+               hptr = hptr + 16L;  /* "hptr += 16L" fails on Turbo C++ 3.0 */
+            }
+
+            for (i = 0; i < num_blocks; i++)
+            {
+               png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
+               hptr = hptr + (png_uint_32)65536L;  /* "+=" fails on TC++3.0 */
+            }
+
+            png_ptr->offset_table_number = num_blocks;
+            png_ptr->offset_table_count = 0;
+            png_ptr->offset_table_count_free = 0;
+         }
+      }
+
+      if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
+      {
+#  ifndef PNG_USER_MEM_SUPPORTED
+         if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+            png_error(png_ptr, "Out of Memory"); /* Note "O" and "M" */
+
+         else
+            png_warning(png_ptr, "Out of Memory");
+#  endif
+         return (NULL);
+      }
+
+      ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
+   }
+
+   else
+      ret = farmalloc(size);
+
+#  ifndef PNG_USER_MEM_SUPPORTED
+   if (ret == NULL)
+   {
+      if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+         png_error(png_ptr, "Out of memory"); /* Note "o" and "m" */
+
+      else
+         png_warning(png_ptr, "Out of memory"); /* Note "o" and "m" */
+   }
+#  endif
+
+   return (ret);
+}
+
+/* Free a pointer allocated by png_malloc().  In the default
+ * configuration, png_ptr is not used, but is passed in case it
+ * is needed.  If ptr is NULL, return without taking any action.
+ */
+void PNGAPI
+png_free(png_structp png_ptr, png_voidp ptr)
+{
+   if (png_ptr == NULL || ptr == NULL)
+      return;
+
+#  ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr->free_fn != NULL)
+   {
+      (*(png_ptr->free_fn))(png_ptr, ptr);
+      return;
+   }
+
+   else
+      png_free_default(png_ptr, ptr);
+}
+
+void PNGAPI
+png_free_default(png_structp png_ptr, png_voidp ptr)
+{
+#  endif /* PNG_USER_MEM_SUPPORTED */
+
+   if (png_ptr == NULL || ptr == NULL)
+      return;
+
+   if (png_ptr->offset_table != NULL)
+   {
+      int i;
+
+      for (i = 0; i < png_ptr->offset_table_count; i++)
+      {
+         if (ptr == png_ptr->offset_table_ptr[i])
+         {
+            ptr = NULL;
+            png_ptr->offset_table_count_free++;
+            break;
+         }
+      }
+      if (png_ptr->offset_table_count_free == png_ptr->offset_table_count)
+      {
+         farfree(png_ptr->offset_table);
+         farfree(png_ptr->offset_table_ptr);
+         png_ptr->offset_table = NULL;
+         png_ptr->offset_table_ptr = NULL;
+      }
+   }
+
+   if (ptr != NULL)
+      farfree(ptr);
+}
+
+#else /* Not the Borland DOS special memory handler */
+
+/* Allocate memory for a png_struct or a png_info.  The malloc and
+   memset can be replaced by a single call to calloc() if this is thought
+   to improve performance noticably. */
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct,(int type),PNG_ALLOCATED)
+{
+#  ifdef PNG_USER_MEM_SUPPORTED
+   return (png_create_struct_2(type, NULL, NULL));
+}
+
+/* Allocate memory for a png_struct or a png_info.  The malloc and
+   memset can be replaced by a single call to calloc() if this is thought
+   to improve performance noticably. */
+PNG_FUNCTION(png_voidp /* PRIVATE */,
+png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
+   PNG_ALLOCATED)
+{
+#  endif /* PNG_USER_MEM_SUPPORTED */
+   png_size_t size;
+   png_voidp struct_ptr;
+
+   if (type == PNG_STRUCT_INFO)
+      size = png_sizeof(png_info);
+
+   else if (type == PNG_STRUCT_PNG)
+      size = png_sizeof(png_struct);
+
+   else
+      return (NULL);
+
+#  ifdef PNG_USER_MEM_SUPPORTED
+   if (malloc_fn != NULL)
+   {
+      png_struct dummy_struct;
+      png_structp png_ptr = &dummy_struct;
+      png_ptr->mem_ptr=mem_ptr;
+      struct_ptr = (*(malloc_fn))(png_ptr, size);
+
+      if (struct_ptr != NULL)
+         png_memset(struct_ptr, 0, size);
+
+      return (struct_ptr);
+   }
+#  endif /* PNG_USER_MEM_SUPPORTED */
+
+#  if defined(__TURBOC__) && !defined(__FLAT__)
+   struct_ptr = (png_voidp)farmalloc(size);
+#  else
+#    if defined(_MSC_VER) && defined(MAXSEG_64K)
+   struct_ptr = (png_voidp)halloc(size, 1);
+#    else
+   struct_ptr = (png_voidp)malloc(size);
+#    endif
+#  endif
+
+   if (struct_ptr != NULL)
+      png_memset(struct_ptr, 0, size);
+
+   return (struct_ptr);
+}
+
+
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct(png_voidp struct_ptr)
+{
+#  ifdef PNG_USER_MEM_SUPPORTED
+   png_destroy_struct_2(struct_ptr, NULL, NULL);
+}
+
+/* Free memory allocated by a png_create_struct() call */
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+    png_voidp mem_ptr)
+{
+#  endif /* PNG_USER_MEM_SUPPORTED */
+   if (struct_ptr != NULL)
+   {
+#  ifdef PNG_USER_MEM_SUPPORTED
+      if (free_fn != NULL)
+      {
+         png_struct dummy_struct;
+         png_structp png_ptr = &dummy_struct;
+         png_ptr->mem_ptr=mem_ptr;
+         (*(free_fn))(png_ptr, struct_ptr);
+         return;
+      }
+#  endif /* PNG_USER_MEM_SUPPORTED */
+#  if defined(__TURBOC__) && !defined(__FLAT__)
+      farfree(struct_ptr);
+
+#  else
+#    if defined(_MSC_VER) && defined(MAXSEG_64K)
+      hfree(struct_ptr);
+
+#    else
+      free(struct_ptr);
+
+#    endif
+#  endif
+   }
+}
+
+/* Allocate memory.  For reasonable files, size should never exceed
+ * 64K.  However, zlib may allocate more then 64K if you don't tell
+ * it not to.  See zconf.h and png.h for more information.  zlib does
+ * need to allocate exactly 64K, so whatever you call here must
+ * have the ability to do that.
+ */
+
+PNG_FUNCTION(png_voidp,PNGAPI
+png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
+{
+   png_voidp ret;
+
+   ret = (png_malloc(png_ptr, size));
+
+   if (ret != NULL)
+      png_memset(ret,0,(png_size_t)size);
+
+   return (ret);
+}
+
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
+{
+   png_voidp ret;
+
+#  ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr == NULL || size == 0)
+      return (NULL);
+
+   if (png_ptr->malloc_fn != NULL)
+      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+
+   else
+      ret = (png_malloc_default(png_ptr, size));
+
+   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+       png_error(png_ptr, "Out of Memory");
+
+   return (ret);
+}
+
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
+{
+   png_voidp ret;
+#  endif /* PNG_USER_MEM_SUPPORTED */
+
+   if (png_ptr == NULL || size == 0)
+      return (NULL);
+
+#  ifdef PNG_MAX_MALLOC_64K
+   if (size > (png_uint_32)65536L)
+   {
+#    ifndef PNG_USER_MEM_SUPPORTED
+      if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+         png_error(png_ptr, "Cannot Allocate > 64K");
+
+      else
+#    endif
+         return NULL;
+   }
+#  endif
+
+   /* Check for overflow */
+#  if defined(__TURBOC__) && !defined(__FLAT__)
+
+   if (size != (unsigned long)size)
+      ret = NULL;
+
+   else
+      ret = farmalloc(size);
+
+#  else
+#    if defined(_MSC_VER) && defined(MAXSEG_64K)
+   if (size != (unsigned long)size)
+      ret = NULL;
+
+   else
+      ret = halloc(size, 1);
+
+#    else
+   if (size != (size_t)size)
+      ret = NULL;
+
+   else
+      ret = malloc((size_t)size);
+#    endif
+#  endif
+
+#  ifndef PNG_USER_MEM_SUPPORTED
+   if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+      png_error(png_ptr, "Out of Memory");
+#  endif
+
+   return (ret);
+}
+
+/* Free a pointer allocated by png_malloc().  If ptr is NULL, return
+ * without taking any action.
+ */
+void PNGAPI
+png_free(png_structp png_ptr, png_voidp ptr)
+{
+   if (png_ptr == NULL || ptr == NULL)
+      return;
+
+#  ifdef PNG_USER_MEM_SUPPORTED
+   if (png_ptr->free_fn != NULL)
+   {
+      (*(png_ptr->free_fn))(png_ptr, ptr);
+      return;
+   }
+
+   else
+      png_free_default(png_ptr, ptr);
+}
+
+void PNGAPI
+png_free_default(png_structp png_ptr, png_voidp ptr)
+{
+   if (png_ptr == NULL || ptr == NULL)
+      return;
+
+#  endif /* PNG_USER_MEM_SUPPORTED */
+
+#  if defined(__TURBOC__) && !defined(__FLAT__)
+   farfree(ptr);
+
+#  else
+#    if defined(_MSC_VER) && defined(MAXSEG_64K)
+   hfree(ptr);
+
+#    else
+   free(ptr);
+
+#    endif
+#  endif
+}
+#endif /* Not Borland DOS special memory handler */
+
+/* This function was added at libpng version 1.2.3.  The png_malloc_warn()
+ * function will set up png_malloc() to issue a png_warning and return NULL
+ * instead of issuing a png_error, if it fails to allocate the requested
+ * memory.
+ */
+PNG_FUNCTION(png_voidp,PNGAPI
+png_malloc_warn,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)
+{
+   png_voidp ptr;
+   png_uint_32 save_flags;
+   if (png_ptr == NULL)
+      return (NULL);
+
+   save_flags = png_ptr->flags;
+   png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
+   ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
+   png_ptr->flags=save_flags;
+   return(ptr);
+}
+
+
+#ifdef PNG_USER_MEM_SUPPORTED
+/* This function is called when the application wants to use another method
+ * of allocating and freeing memory.
+ */
+void PNGAPI
+png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
+  malloc_fn, png_free_ptr free_fn)
+{
+   if (png_ptr != NULL)
+   {
+      png_ptr->mem_ptr = mem_ptr;
+      png_ptr->malloc_fn = malloc_fn;
+      png_ptr->free_fn = free_fn;
+   }
+}
+
+/* This function returns a pointer to the mem_ptr associated with the user
+ * functions.  The application should free any memory associated with this
+ * pointer before png_write_destroy and png_read_destroy are called.
+ */
+png_voidp PNGAPI
+png_get_mem_ptr(png_const_structp png_ptr)
+{
+   if (png_ptr == NULL)
+      return (NULL);
+
+   return ((png_voidp)png_ptr->mem_ptr);
+}
+#endif /* PNG_USER_MEM_SUPPORTED */
+#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */