/* png.c - location for general purpose libpng functions
*
- * libpng version 1.2.6 - August 15, 2004
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2004 Glenn Randers-Pehrson
+ * Last changed in libpng 1.4.2 [May 6, 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 code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
*/
-#define PNG_INTERNAL
#define PNG_NO_EXTERN
+#define PNG_NO_PEDANTIC_WARNINGS
#include "png.h"
+#include "pngpriv.h"
/* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_6 Your_png_h_is_not_version_1_2_6;
+typedef version_1_4_4 Your_png_h_is_not_version_1_4_4;
/* Version information for C files. This had better match the version
- * string defined in png.h. */
-
-#ifdef PNG_USE_GLOBAL_ARRAYS
-/* png_libpng_ver was changed to a function in version 1.0.5c */
-const char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
-
-/* png_sig was changed to a function in version 1.0.5c */
-/* Place to hold the signature string for a PNG file. */
-const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
-
-/* Invoke global declarations for constant strings for known chunk types */
-PNG_IHDR;
-PNG_IDAT;
-PNG_IEND;
-PNG_PLTE;
-PNG_bKGD;
-PNG_cHRM;
-PNG_gAMA;
-PNG_hIST;
-PNG_iCCP;
-PNG_iTXt;
-PNG_oFFs;
-PNG_pCAL;
-PNG_sCAL;
-PNG_pHYs;
-PNG_sBIT;
-PNG_sPLT;
-PNG_sRGB;
-PNG_tEXt;
-PNG_tIME;
-PNG_tRNS;
-PNG_zTXt;
-
-/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-
-/* start of interlace block */
-const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
-
-/* offset to next interlace block */
-const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
-
-/* start of interlace block in the y direction */
-const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
-
-/* offset to next interlace block in the y direction */
-const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
-
-/* width of interlace block (used in assembler routines only) */
-#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
-const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
-#endif
-
-/* Height of interlace block. This is not currently used - if you need
- * it, uncomment it here and in png.h
-const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
-*/
-
-/* Mask to determine which pixels are valid in a pass */
-const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
-
-/* Mask to determine which pixels to overwrite while displaying */
-const int FARDATA png_pass_dsp_mask[]
- = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
-
-#endif
+ * string defined in png.h.
+ */
/* Tells libpng that we have already handled the first "num_bytes" bytes
* of the PNG file signature. If the PNG data is embedded into another
* or write any of the magic bytes before it starts on the IHDR.
*/
+#ifdef PNG_READ_SUPPORTED
void PNGAPI
png_set_sig_bytes(png_structp png_ptr, int num_bytes)
{
- png_debug(1, "in png_set_sig_bytes\n");
+ png_debug(1, "in png_set_sig_bytes");
+
+ if (png_ptr == NULL)
+ return;
+
if (num_bytes > 8)
- png_error(png_ptr, "Too many bytes for PNG signature.");
+ png_error(png_ptr, "Too many bytes for PNG signature");
png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
}
if (num_to_check > 8)
num_to_check = 8;
else if (num_to_check < 1)
- return (0);
+ return (-1);
if (start > 7)
- return (0);
+ return (-1);
if (start + num_to_check > 8)
num_to_check = 8 - start;
return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
}
-/* (Obsolete) function to check signature bytes. It does not allow one
- * to check a partial signature. This function might be removed in the
- * future - use png_sig_cmp(). Returns true (nonzero) if the file is a PNG.
- */
-int PNGAPI
-png_check_sig(png_bytep sig, int num)
-{
- return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
-}
+#endif /* PNG_READ_SUPPORTED */
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
/* Function to allocate memory for zlib and clear it to 0. */
-#ifdef PNG_1_0_X
-voidpf PNGAPI
-#else
-voidpf /* private */
-#endif
+voidpf /* PRIVATE */
png_zalloc(voidpf png_ptr, uInt items, uInt size)
{
png_voidp ptr;
- png_structp p=(png_struct*)png_ptr;
+ png_structp p=(png_structp)png_ptr;
png_uint_32 save_flags=p->flags;
- png_uint_32 num_bytes;
+ png_alloc_size_t num_bytes;
+ if (png_ptr == NULL)
+ return (NULL);
if (items > PNG_UINT_32_MAX/size)
{
- png_warning (png_ptr, "Potential overflow in png_zalloc()");
+ png_warning (p, "Potential overflow in png_zalloc()");
return (NULL);
}
- num_bytes = (png_uint_32)items * size;
+ num_bytes = (png_alloc_size_t)items * size;
p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
p->flags=save_flags;
-#if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO)
- if (ptr == NULL)
- return ((voidpf)ptr);
-
- if (num_bytes > (png_uint_32)0x8000L)
- {
- png_memset(ptr, 0, (png_size_t)0x8000L);
- png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
- (png_size_t)(num_bytes - (png_uint_32)0x8000L));
- }
- else
- {
- png_memset(ptr, 0, (png_size_t)num_bytes);
- }
-#endif
return ((voidpf)ptr);
}
-/* function to free memory for zlib */
-#ifdef PNG_1_0_X
-void PNGAPI
-#else
-void /* private */
-#endif
+/* Function to free memory for zlib */
+void /* PRIVATE */
png_zfree(voidpf png_ptr, voidpf ptr)
{
png_free((png_structp)png_ptr, (png_voidp)ptr);
{
png_infop info_ptr;
- png_debug(1, "in png_create_info_struct\n");
- if(png_ptr == NULL) return (NULL);
+ png_debug(1, "in png_create_info_struct");
+
+ if (png_ptr == NULL)
+ return (NULL);
+
#ifdef PNG_USER_MEM_SUPPORTED
info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
png_ptr->malloc_fn, png_ptr->mem_ptr);
{
png_infop info_ptr = NULL;
- png_debug(1, "in png_destroy_info_struct\n");
+ png_debug(1, "in png_destroy_info_struct");
+
+ if (png_ptr == NULL)
+ return;
+
if (info_ptr_ptr != NULL)
info_ptr = *info_ptr_ptr;
* and applications using it are urged to use png_create_info_struct()
* instead.
*/
-#undef png_info_init
-void PNGAPI
-png_info_init(png_infop info_ptr)
-{
- /* We only come here via pre-1.0.12-compiled applications */
- png_info_init_3(&info_ptr, 0);
-}
void PNGAPI
png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
{
png_infop info_ptr = *ptr_ptr;
- png_debug(1, "in png_info_init_3\n");
+ png_debug(1, "in png_info_init_3");
+
+ if (info_ptr == NULL)
+ return;
- if(png_sizeof(png_info) > png_info_struct_size)
- {
- png_destroy_struct(info_ptr);
- info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
- *ptr_ptr = info_ptr;
- }
+ if (png_sizeof(png_info) > png_info_struct_size)
+ {
+ png_destroy_struct(info_ptr);
+ info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+ *ptr_ptr = info_ptr;
+ }
- /* set everything to 0 */
- png_memset(info_ptr, 0, png_sizeof (png_info));
+ /* Set everything to 0 */
+ png_memset(info_ptr, 0, png_sizeof(png_info));
}
-#ifdef PNG_FREE_ME_SUPPORTED
void PNGAPI
png_data_freer(png_structp png_ptr, png_infop info_ptr,
int freer, png_uint_32 mask)
{
- png_debug(1, "in png_data_freer\n");
+ png_debug(1, "in png_data_freer");
+
if (png_ptr == NULL || info_ptr == NULL)
return;
- if(freer == PNG_DESTROY_WILL_FREE_DATA)
+
+ if (freer == PNG_DESTROY_WILL_FREE_DATA)
info_ptr->free_me |= mask;
- else if(freer == PNG_USER_WILL_FREE_DATA)
+ else if (freer == PNG_USER_WILL_FREE_DATA)
info_ptr->free_me &= ~mask;
else
png_warning(png_ptr,
- "Unknown freer parameter in png_data_freer.");
+ "Unknown freer parameter in png_data_freer");
}
-#endif
void PNGAPI
png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
int num)
{
- png_debug(1, "in png_free_data\n");
+ png_debug(1, "in png_free_data");
+
if (png_ptr == NULL || info_ptr == NULL)
return;
-#if defined(PNG_TEXT_SUPPORTED)
-/* free text item num or (if num == -1) all text items */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_TEXT)
-#endif
-{
- if (num != -1)
+#ifdef PNG_TEXT_SUPPORTED
+ /* Free text item num or (if num == -1) all text items */
+ if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
{
- if (info_ptr->text && info_ptr->text[num].key)
- {
- png_free(png_ptr, info_ptr->text[num].key);
- info_ptr->text[num].key = NULL;
- }
- }
- else
- {
- int i;
- for (i = 0; i < info_ptr->num_text; i++)
- png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
- png_free(png_ptr, info_ptr->text);
- info_ptr->text = NULL;
- info_ptr->num_text=0;
+ if (num != -1)
+ {
+ if (info_ptr->text && info_ptr->text[num].key)
+ {
+ png_free(png_ptr, info_ptr->text[num].key);
+ info_ptr->text[num].key = NULL;
+ }
+ }
+ else
+ {
+ int i;
+ for (i = 0; i < info_ptr->num_text; i++)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
+ png_free(png_ptr, info_ptr->text);
+ info_ptr->text = NULL;
+ info_ptr->num_text=0;
+ }
}
-}
#endif
-#if defined(PNG_tRNS_SUPPORTED)
-/* free any tRNS entry */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
-#else
-if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
-#endif
-{
- png_free(png_ptr, info_ptr->trans);
- info_ptr->valid &= ~PNG_INFO_tRNS;
-#ifndef PNG_FREE_ME_SUPPORTED
- png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
-#endif
- info_ptr->trans = NULL;
-}
+#ifdef PNG_tRNS_SUPPORTED
+ /* Free any tRNS entry */
+ if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
+ {
+ png_free(png_ptr, info_ptr->trans_alpha);
+ info_ptr->trans_alpha = NULL;
+ info_ptr->valid &= ~PNG_INFO_tRNS;
+ }
#endif
-#if defined(PNG_sCAL_SUPPORTED)
-/* free any sCAL entry */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_SCAL)
-#endif
-{
+#ifdef PNG_sCAL_SUPPORTED
+ /* Free any sCAL entry */
+ if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
+ {
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
- png_free(png_ptr, info_ptr->scal_s_width);
- png_free(png_ptr, info_ptr->scal_s_height);
- info_ptr->scal_s_width = NULL;
- info_ptr->scal_s_height = NULL;
+ png_free(png_ptr, info_ptr->scal_s_width);
+ png_free(png_ptr, info_ptr->scal_s_height);
+ info_ptr->scal_s_width = NULL;
+ info_ptr->scal_s_height = NULL;
#endif
- info_ptr->valid &= ~PNG_INFO_sCAL;
-}
+ info_ptr->valid &= ~PNG_INFO_sCAL;
+ }
#endif
-#if defined(PNG_pCAL_SUPPORTED)
-/* free any pCAL entry */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_PCAL)
-#endif
-{
- png_free(png_ptr, info_ptr->pcal_purpose);
- png_free(png_ptr, info_ptr->pcal_units);
- info_ptr->pcal_purpose = NULL;
- info_ptr->pcal_units = NULL;
- if (info_ptr->pcal_params != NULL)
- {
- int i;
- for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
- {
- png_free(png_ptr, info_ptr->pcal_params[i]);
- info_ptr->pcal_params[i]=NULL;
- }
- png_free(png_ptr, info_ptr->pcal_params);
- info_ptr->pcal_params = NULL;
- }
- info_ptr->valid &= ~PNG_INFO_pCAL;
-}
+#ifdef PNG_pCAL_SUPPORTED
+ /* Free any pCAL entry */
+ if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
+ {
+ png_free(png_ptr, info_ptr->pcal_purpose);
+ png_free(png_ptr, info_ptr->pcal_units);
+ info_ptr->pcal_purpose = NULL;
+ info_ptr->pcal_units = NULL;
+ if (info_ptr->pcal_params != NULL)
+ {
+ int i;
+ for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
+ {
+ png_free(png_ptr, info_ptr->pcal_params[i]);
+ info_ptr->pcal_params[i] = NULL;
+ }
+ png_free(png_ptr, info_ptr->pcal_params);
+ info_ptr->pcal_params = NULL;
+ }
+ info_ptr->valid &= ~PNG_INFO_pCAL;
+ }
#endif
-#if defined(PNG_iCCP_SUPPORTED)
-/* free any iCCP entry */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_ICCP)
-#endif
-{
- png_free(png_ptr, info_ptr->iccp_name);
- png_free(png_ptr, info_ptr->iccp_profile);
- info_ptr->iccp_name = NULL;
- info_ptr->iccp_profile = NULL;
- info_ptr->valid &= ~PNG_INFO_iCCP;
-}
+#ifdef PNG_iCCP_SUPPORTED
+ /* Free any iCCP entry */
+ if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
+ {
+ png_free(png_ptr, info_ptr->iccp_name);
+ png_free(png_ptr, info_ptr->iccp_profile);
+ info_ptr->iccp_name = NULL;
+ info_ptr->iccp_profile = NULL;
+ info_ptr->valid &= ~PNG_INFO_iCCP;
+ }
#endif
-#if defined(PNG_sPLT_SUPPORTED)
-/* free a given sPLT entry, or (if num == -1) all sPLT entries */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_SPLT)
-#endif
-{
- if (num != -1)
+#ifdef PNG_sPLT_SUPPORTED
+ /* Free a given sPLT entry, or (if num == -1) all sPLT entries */
+ if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
{
- if(info_ptr->splt_palettes)
+ if (num != -1)
{
- png_free(png_ptr, info_ptr->splt_palettes[num].name);
- png_free(png_ptr, info_ptr->splt_palettes[num].entries);
- info_ptr->splt_palettes[num].name = NULL;
- info_ptr->splt_palettes[num].entries = NULL;
+ if (info_ptr->splt_palettes)
+ {
+ png_free(png_ptr, info_ptr->splt_palettes[num].name);
+ png_free(png_ptr, info_ptr->splt_palettes[num].entries);
+ info_ptr->splt_palettes[num].name = NULL;
+ info_ptr->splt_palettes[num].entries = NULL;
+ }
+ }
+ else
+ {
+ if (info_ptr->splt_palettes_num)
+ {
+ int i;
+ for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
+
+ png_free(png_ptr, info_ptr->splt_palettes);
+ info_ptr->splt_palettes = NULL;
+ info_ptr->splt_palettes_num = 0;
+ }
+ info_ptr->valid &= ~PNG_INFO_sPLT;
}
}
- else
- {
- if(info_ptr->splt_palettes_num)
- {
- int i;
- for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
- png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
-
- png_free(png_ptr, info_ptr->splt_palettes);
- info_ptr->splt_palettes = NULL;
- info_ptr->splt_palettes_num = 0;
- }
- info_ptr->valid &= ~PNG_INFO_sPLT;
- }
-}
#endif
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_UNKN)
-#endif
-{
- if (num != -1)
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+ if (png_ptr->unknown_chunk.data)
{
- if(info_ptr->unknown_chunks)
- {
- png_free(png_ptr, info_ptr->unknown_chunks[num].data);
- info_ptr->unknown_chunks[num].data = NULL;
- }
+ png_free(png_ptr, png_ptr->unknown_chunk.data);
+ png_ptr->unknown_chunk.data = NULL;
}
- else
+
+ if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
{
- int i;
+ if (num != -1)
+ {
+ if (info_ptr->unknown_chunks)
+ {
+ png_free(png_ptr, info_ptr->unknown_chunks[num].data);
+ info_ptr->unknown_chunks[num].data = NULL;
+ }
+ }
+ else
+ {
+ int i;
- if(info_ptr->unknown_chunks_num)
- {
- for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
- png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
+ if (info_ptr->unknown_chunks_num)
+ {
+ for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
- png_free(png_ptr, info_ptr->unknown_chunks);
- info_ptr->unknown_chunks = NULL;
- info_ptr->unknown_chunks_num = 0;
- }
+ png_free(png_ptr, info_ptr->unknown_chunks);
+ info_ptr->unknown_chunks = NULL;
+ info_ptr->unknown_chunks_num = 0;
+ }
+ }
}
-}
#endif
-#if defined(PNG_hIST_SUPPORTED)
-/* free any hIST entry */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
-#else
-if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
-#endif
-{
- png_free(png_ptr, info_ptr->hist);
- info_ptr->hist = NULL;
- info_ptr->valid &= ~PNG_INFO_hIST;
-#ifndef PNG_FREE_ME_SUPPORTED
- png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
-#endif
-}
+#ifdef PNG_hIST_SUPPORTED
+ /* Free any hIST entry */
+ if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
+ {
+ png_free(png_ptr, info_ptr->hist);
+ info_ptr->hist = NULL;
+ info_ptr->valid &= ~PNG_INFO_hIST;
+ }
#endif
-/* free any PLTE entry that was internally allocated */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
-#else
-if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
-#endif
-{
- png_zfree(png_ptr, info_ptr->palette);
- info_ptr->palette = NULL;
- info_ptr->valid &= ~PNG_INFO_PLTE;
-#ifndef PNG_FREE_ME_SUPPORTED
- png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
-#endif
- info_ptr->num_palette = 0;
-}
+ /* Free any PLTE entry that was internally allocated */
+ if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
+ {
+ png_zfree(png_ptr, info_ptr->palette);
+ info_ptr->palette = NULL;
+ info_ptr->valid &= ~PNG_INFO_PLTE;
+ info_ptr->num_palette = 0;
+ }
-#if defined(PNG_INFO_IMAGE_SUPPORTED)
-/* free any image bits attached to the info structure */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_ROWS)
-#endif
-{
- if(info_ptr->row_pointers)
- {
- int row;
- for (row = 0; row < (int)info_ptr->height; row++)
- {
- png_free(png_ptr, info_ptr->row_pointers[row]);
- info_ptr->row_pointers[row]=NULL;
- }
- png_free(png_ptr, info_ptr->row_pointers);
- info_ptr->row_pointers=NULL;
- }
- info_ptr->valid &= ~PNG_INFO_IDAT;
-}
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+ /* Free any image bits attached to the info structure */
+ if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
+ {
+ if (info_ptr->row_pointers)
+ {
+ int row;
+ for (row = 0; row < (int)info_ptr->height; row++)
+ {
+ png_free(png_ptr, info_ptr->row_pointers[row]);
+ info_ptr->row_pointers[row] = NULL;
+ }
+ png_free(png_ptr, info_ptr->row_pointers);
+ info_ptr->row_pointers = NULL;
+ }
+ info_ptr->valid &= ~PNG_INFO_IDAT;
+ }
#endif
-#ifdef PNG_FREE_ME_SUPPORTED
- if(num == -1)
- info_ptr->free_me &= ~mask;
+ if (num == -1)
+ info_ptr->free_me &= ~mask;
else
- info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
-#endif
+ info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
}
/* This is an internal routine to free any memory that the info struct is
void /* PRIVATE */
png_info_destroy(png_structp png_ptr, png_infop info_ptr)
{
- png_debug(1, "in png_info_destroy\n");
+ png_debug(1, "in png_info_destroy");
png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
if (png_ptr->num_chunk_list)
{
- png_free(png_ptr, png_ptr->chunk_list);
- png_ptr->chunk_list=NULL;
- png_ptr->num_chunk_list=0;
+ png_free(png_ptr, png_ptr->chunk_list);
+ png_ptr->chunk_list = NULL;
+ png_ptr->num_chunk_list = 0;
}
#endif
png_info_init_3(&info_ptr, png_sizeof(png_info));
}
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
/* This function returns a pointer to the io_ptr associated with the user
* functions. The application should free any memory associated with this
png_voidp PNGAPI
png_get_io_ptr(png_structp png_ptr)
{
+ if (png_ptr == NULL)
+ return (NULL);
return (png_ptr->io_ptr);
}
-#if !defined(PNG_NO_STDIO)
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
+#ifdef PNG_STDIO_SUPPORTED
/* Initialize the default input/output functions for the PNG file. If you
* use your own read or write routines, you can call either png_set_read_fn()
* or png_set_write_fn() instead of png_init_io(). If you have defined
void PNGAPI
png_init_io(png_structp png_ptr, png_FILE_p fp)
{
- png_debug(1, "in png_init_io\n");
+ png_debug(1, "in png_init_io");
+
+ if (png_ptr == NULL)
+ return;
+
png_ptr->io_ptr = (png_voidp)fp;
}
#endif
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
+#ifdef PNG_TIME_RFC1123_SUPPORTED
/* Convert the supplied time into an RFC 1123 string suitable for use in
* a "Creation Time" or other text-based time string.
*/
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+ if (png_ptr == NULL)
+ return (NULL);
if (png_ptr->time_buffer == NULL)
{
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
png_sizeof(char)));
}
-#if defined(_WIN32_WCE)
- {
- wchar_t time_buf[29];
- wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
- ptime->day % 32, short_months[(ptime->month - 1) % 12],
- ptime->year, ptime->hour % 24, ptime->minute % 60,
- ptime->second % 61);
- WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
- NULL, NULL);
- }
-#else
#ifdef USE_FAR_KEYWORD
{
char near_time_buf[29];
- sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
+ png_snprintf6(near_time_buf, 29, "%d %s %d %02d:%02d:%02d +0000",
ptime->day % 32, short_months[(ptime->month - 1) % 12],
ptime->year, ptime->hour % 24, ptime->minute % 60,
ptime->second % 61);
29*png_sizeof(char));
}
#else
- sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
+ png_snprintf6(png_ptr->time_buffer, 29, "%d %s %d %02d:%02d:%02d +0000",
ptime->day % 32, short_months[(ptime->month - 1) % 12],
ptime->year, ptime->hour % 24, ptime->minute % 60,
ptime->second % 61);
#endif
-#endif /* _WIN32_WCE */
return ((png_charp)png_ptr->time_buffer);
}
#endif /* PNG_TIME_RFC1123_SUPPORTED */
-#if 0
-/* Signature string for a PNG file. */
-png_bytep PNGAPI
-png_sig_bytes(void)
-{
- return ((png_bytep)"\211\120\116\107\015\012\032\012");
-}
-#endif
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
png_charp PNGAPI
png_get_copyright(png_structp png_ptr)
{
- if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
- return ((png_charp) "\n libpng version 1.2.6 - August 15, 2004\n\
- Copyright (c) 1998-2004 Glenn Randers-Pehrson\n\
- Copyright (c) 1996-1997 Andreas Dilger\n\
- Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
- return ((png_charp) "");
+ png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
+#ifdef PNG_STRING_COPYRIGHT
+ return PNG_STRING_COPYRIGHT
+#else
+#ifdef __STDC__
+ return ((png_charp) PNG_STRING_NEWLINE \
+ "libpng version 1.4.4 - September 23, 2010" PNG_STRING_NEWLINE \
+ "Copyright (c) 1998-2010 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
+ "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
+ "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
+ PNG_STRING_NEWLINE);
+#else
+ return ((png_charp) "libpng version 1.4.4 - September 23, 2010\
+ Copyright (c) 1998-2010 Glenn Randers-Pehrson\
+ Copyright (c) 1996-1997 Andreas Dilger\
+ Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.");
+#endif
+#endif
}
/* The following return the library version as a short string in the
png_get_libpng_ver(png_structp png_ptr)
{
/* Version of *.c files used when building libpng */
- if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
- return ((png_charp) PNG_LIBPNG_VER_STRING);
- return ((png_charp) "");
+ png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
+ return ((png_charp) PNG_LIBPNG_VER_STRING);
}
png_charp PNGAPI
png_get_header_ver(png_structp png_ptr)
{
/* Version of *.h files used when building libpng */
- if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
- return ((png_charp) PNG_LIBPNG_VER_STRING);
- return ((png_charp) "");
+ png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
+ return ((png_charp) PNG_LIBPNG_VER_STRING);
}
png_charp PNGAPI
png_get_header_version(png_structp png_ptr)
{
/* Returns longer string containing both version and date */
- if (&png_ptr != NULL) /* silence compiler warning about unused png_ptr */
- return ((png_charp) PNG_HEADER_VERSION_STRING);
- return ((png_charp) "");
+ png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
+#ifdef __STDC__
+ return ((png_charp) PNG_HEADER_VERSION_STRING
+#ifndef PNG_READ_SUPPORTED
+ " (NO READ SUPPORT)"
+#endif
+ PNG_STRING_NEWLINE);
+#else
+ return ((png_charp) PNG_HEADER_VERSION_STRING);
+#endif
}
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
int PNGAPI
png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
{
- /* check chunk_name and return "keep" value if it's on the list, else 0 */
+ /* Check chunk_name and return "keep" value if it's on the list, else 0 */
int i;
png_bytep p;
- if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
+ if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
return 0;
- p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
- for (i = png_ptr->num_chunk_list; i; i--, p-=5)
+ p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5;
+ for (i = png_ptr->num_chunk_list; i; i--, p -= 5)
if (!png_memcmp(chunk_name, p, 4))
- return ((int)*(p+4));
+ return ((int)*(p + 4));
return 0;
}
#endif
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
+#ifdef PNG_READ_SUPPORTED
/* This function, added to libpng-1.0.6g, is untested. */
int PNGAPI
png_reset_zstream(png_structp png_ptr)
{
+ if (png_ptr == NULL)
+ return Z_STREAM_ERROR;
return (inflateReset(&png_ptr->zstream));
}
+#endif /* PNG_READ_SUPPORTED */
/* This function was added to libpng-1.0.7 */
png_uint_32 PNGAPI
}
-#if !defined(PNG_1_0_X)
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
- /* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */
-/* this INTERNAL function was added to libpng 1.2.0 */
-void /* PRIVATE */
-png_init_mmx_flags (png_structp png_ptr)
-{
- png_ptr->mmx_rowbytes_threshold = 0;
- png_ptr->mmx_bitdepth_threshold = 0;
-
-# if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD))
-
- png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;
-
- if (png_mmx_support() > 0) {
- png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
-# ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
- | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
-# endif
-# ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
- | PNG_ASM_FLAG_MMX_READ_INTERLACE
-# endif
-# ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
- ;
-# else
- | PNG_ASM_FLAG_MMX_READ_FILTER_SUB
- | PNG_ASM_FLAG_MMX_READ_FILTER_UP
- | PNG_ASM_FLAG_MMX_READ_FILTER_AVG
- | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
-
- png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
- png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
-# endif
- } else {
- png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
- | PNG_MMX_READ_FLAGS
- | PNG_MMX_WRITE_FLAGS );
- }
-
-# else /* !((PNGVCRD || PNGGCCRD) && PNG_ASSEMBLER_CODE_SUPPORTED)) */
-
- /* clear all MMX flags; no support is compiled in */
- png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );
-
-# endif /* ?(PNGVCRD || PNGGCCRD) */
-}
-
-#endif /* !(PNG_ASSEMBLER_CODE_SUPPORTED) */
-
-/* this function was added to libpng 1.2.0 */
-#if !defined(PNG_USE_PNGGCCRD) && \
- !(defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD))
-int PNGAPI
-png_mmx_support(void)
-{
- return -1;
-}
-#endif
-#endif /* PNG_1_0_X */
+#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
#ifdef PNG_SIZE_T
/* Added at libpng version 1.2.6 */
PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
png_size_t PNGAPI
png_convert_size(size_t size)
{
- if (size > (png_size_t)-1)
- PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
- return ((png_size_t)size);
+ if (size > (png_size_t)-1)
+ PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
+ return ((png_size_t)size);
}
#endif /* PNG_SIZE_T */
+
+/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */
+#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_CHECK_cHRM_SUPPORTED
+
+/*
+ * Multiply two 32-bit numbers, V1 and V2, using 32-bit
+ * arithmetic, to produce a 64 bit result in the HI/LO words.
+ *
+ * A B
+ * x C D
+ * ------
+ * AD || BD
+ * AC || CB || 0
+ *
+ * where A and B are the high and low 16-bit words of V1,
+ * C and D are the 16-bit words of V2, AD is the product of
+ * A and D, and X || Y is (X << 16) + Y.
+*/
+
+void /* PRIVATE */
+png_64bit_product (long v1, long v2, unsigned long *hi_product,
+ unsigned long *lo_product)
+{
+ int a, b, c, d;
+ long lo, hi, x, y;
+
+ a = (v1 >> 16) & 0xffff;
+ b = v1 & 0xffff;
+ c = (v2 >> 16) & 0xffff;
+ d = v2 & 0xffff;
+
+ lo = b * d; /* BD */
+ x = a * d + c * b; /* AD + CB */
+ y = ((lo >> 16) & 0xffff) + x;
+
+ lo = (lo & 0xffff) | ((y & 0xffff) << 16);
+ hi = (y >> 16) & 0xffff;
+
+ hi += a * c; /* AC */
+
+ *hi_product = (unsigned long)hi;
+ *lo_product = (unsigned long)lo;
+}
+
+int /* PRIVATE */
+png_check_cHRM_fixed(png_structp png_ptr,
+ png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
+ png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
+ png_fixed_point blue_x, png_fixed_point blue_y)
+{
+ int ret = 1;
+ unsigned long xy_hi,xy_lo,yx_hi,yx_lo;
+
+ png_debug(1, "in function png_check_cHRM_fixed");
+
+ if (png_ptr == NULL)
+ return 0;
+
+ if (white_x < 0 || white_y <= 0 ||
+ red_x < 0 || red_y < 0 ||
+ green_x < 0 || green_y < 0 ||
+ blue_x < 0 || blue_y < 0)
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to set negative chromaticity value");
+ ret = 0;
+ }
+ if (white_x > (png_fixed_point) PNG_UINT_31_MAX ||
+ white_y > (png_fixed_point) PNG_UINT_31_MAX ||
+ red_x > (png_fixed_point) PNG_UINT_31_MAX ||
+ red_y > (png_fixed_point) PNG_UINT_31_MAX ||
+ green_x > (png_fixed_point) PNG_UINT_31_MAX ||
+ green_y > (png_fixed_point) PNG_UINT_31_MAX ||
+ blue_x > (png_fixed_point) PNG_UINT_31_MAX ||
+ blue_y > (png_fixed_point) PNG_UINT_31_MAX )
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to set chromaticity value exceeding 21474.83");
+ ret = 0;
+ }
+ if (white_x > 100000L - white_y)
+ {
+ png_warning(png_ptr, "Invalid cHRM white point");
+ ret = 0;
+ }
+ if (red_x > 100000L - red_y)
+ {
+ png_warning(png_ptr, "Invalid cHRM red point");
+ ret = 0;
+ }
+ if (green_x > 100000L - green_y)
+ {
+ png_warning(png_ptr, "Invalid cHRM green point");
+ ret = 0;
+ }
+ if (blue_x > 100000L - blue_y)
+ {
+ png_warning(png_ptr, "Invalid cHRM blue point");
+ ret = 0;
+ }
+
+ png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo);
+ png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo);
+
+ if (xy_hi == yx_hi && xy_lo == yx_lo)
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to set cHRM RGB triangle with zero area");
+ ret = 0;
+ }
+
+ return ret;
+}
+#endif /* PNG_CHECK_cHRM_SUPPORTED */
+#endif /* PNG_cHRM_SUPPORTED */
+
+void /* PRIVATE */
+png_check_IHDR(png_structp png_ptr,
+ png_uint_32 width, png_uint_32 height, int bit_depth,
+ int color_type, int interlace_type, int compression_type,
+ int filter_type)
+{
+ int error = 0;
+
+ /* Check for width and height valid values */
+ if (width == 0)
+ {
+ png_warning(png_ptr, "Image width is zero in IHDR");
+ error = 1;
+ }
+
+ if (height == 0)
+ {
+ png_warning(png_ptr, "Image height is zero in IHDR");
+ error = 1;
+ }
+
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+ if (width > png_ptr->user_width_max || width > PNG_USER_WIDTH_MAX)
+#else
+ if (width > PNG_USER_WIDTH_MAX)
+#endif
+ {
+ png_warning(png_ptr, "Image width exceeds user limit in IHDR");
+ error = 1;
+ }
+
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+ if (height > png_ptr->user_height_max || height > PNG_USER_HEIGHT_MAX)
+#else
+ if (height > PNG_USER_HEIGHT_MAX)
+#endif
+ {
+ png_warning(png_ptr, "Image height exceeds user limit in IHDR");
+ error = 1;
+ }
+
+ if (width > PNG_UINT_31_MAX)
+ {
+ png_warning(png_ptr, "Invalid image width in IHDR");
+ error = 1;
+ }
+
+ if ( height > PNG_UINT_31_MAX)
+ {
+ png_warning(png_ptr, "Invalid image height in IHDR");
+ error = 1;
+ }
+
+ if ( width > (PNG_UINT_32_MAX
+ >> 3) /* 8-byte RGBA pixels */
+ - 64 /* bigrowbuf hack */
+ - 1 /* filter byte */
+ - 7*8 /* rounding of width to multiple of 8 pixels */
+ - 8) /* extra max_pixel_depth pad */
+ png_warning(png_ptr, "Width is too large for libpng to process pixels");
+
+ /* Check other values */
+ if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
+ bit_depth != 8 && bit_depth != 16)
+ {
+ png_warning(png_ptr, "Invalid bit depth in IHDR");
+ error = 1;
+ }
+
+ if (color_type < 0 || color_type == 1 ||
+ color_type == 5 || color_type > 6)
+ {
+ png_warning(png_ptr, "Invalid color type in IHDR");
+ error = 1;
+ }
+
+ if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
+ ((color_type == PNG_COLOR_TYPE_RGB ||
+ color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
+ color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
+ {
+ png_warning(png_ptr, "Invalid color type/bit depth combination in IHDR");
+ error = 1;
+ }
+
+ if (interlace_type >= PNG_INTERLACE_LAST)
+ {
+ png_warning(png_ptr, "Unknown interlace method in IHDR");
+ error = 1;
+ }
+
+ if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+ {
+ png_warning(png_ptr, "Unknown compression method in IHDR");
+ error = 1;
+ }
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+ /* Accept filter_method 64 (intrapixel differencing) only if
+ * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+ * 2. Libpng did not read a PNG signature (this filter_method is only
+ * used in PNG datastreams that are embedded in MNG datastreams) and
+ * 3. The application called png_permit_mng_features with a mask that
+ * included PNG_FLAG_MNG_FILTER_64 and
+ * 4. The filter_method is 64 and
+ * 5. The color_type is RGB or RGBA
+ */
+ if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) &&
+ png_ptr->mng_features_permitted)
+ png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
+
+ if (filter_type != PNG_FILTER_TYPE_BASE)
+ {
+ if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+ (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
+ ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) &&
+ (color_type == PNG_COLOR_TYPE_RGB ||
+ color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
+ {
+ png_warning(png_ptr, "Unknown filter method in IHDR");
+ error = 1;
+ }
+
+ if (png_ptr->mode & PNG_HAVE_PNG_SIGNATURE)
+ {
+ png_warning(png_ptr, "Invalid filter method in IHDR");
+ error = 1;
+ }
+ }
+
+#else
+ if (filter_type != PNG_FILTER_TYPE_BASE)
+ {
+ png_warning(png_ptr, "Unknown filter method in IHDR");
+ error = 1;
+ }
+#endif
+
+ if (error == 1)
+ png_error(png_ptr, "Invalid IHDR data");
+}
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
projects / wxWidgets.git / blobdiff