/* png.c - location for general purpose libpng functions
*
- * libpng version 1.0.3 - January 14, 1999
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
- *
+ * Last changed in libpng 1.2.34 [December 18, 2008]
+ * For conditions of distribution and use, see copyright notice in png.h
+ * Copyright (c) 1998-2008 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.)
*/
#define PNG_INTERNAL
#define PNG_NO_EXTERN
#include "png.h"
+/* Generate a compiler error if there is an old png.h in the search path. */
+typedef version_1_2_34 Your_png_h_is_not_version_1_2_34;
+
/* Version information for C files. This had better match the version
- * string defined in png.h.
- */
+ * string defined in png.h. */
-char png_libpng_ver[12] = "1.0.3";
+#ifdef PNG_USE_GLOBAL_ARRAYS
+/* png_libpng_ver was changed to a function in version 1.0.5c */
+PNG_CONST char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
-/* Place to hold the signature string for a PNG file. */
-png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
-
-/* Constant strings for known chunk types. If you need to add a chunk,
- * add a string holding the name here. If you want to make the code
- * portable to EBCDIC machines, use ASCII numbers, not characters.
- */
-png_byte FARDATA png_IHDR[5] = { 73, 72, 68, 82, '\0'};
-png_byte FARDATA png_IDAT[5] = { 73, 68, 65, 84, '\0'};
-png_byte FARDATA png_IEND[5] = { 73, 69, 78, 68, '\0'};
-png_byte FARDATA png_PLTE[5] = { 80, 76, 84, 69, '\0'};
-png_byte FARDATA png_bKGD[5] = { 98, 75, 71, 68, '\0'};
-png_byte FARDATA png_cHRM[5] = { 99, 72, 82, 77, '\0'};
-png_byte FARDATA png_gAMA[5] = {103, 65, 77, 65, '\0'};
-png_byte FARDATA png_hIST[5] = {104, 73, 83, 84, '\0'};
-png_byte FARDATA png_oFFs[5] = {111, 70, 70, 115, '\0'};
-png_byte FARDATA png_pCAL[5] = {112, 67, 65, 76, '\0'};
-png_byte FARDATA png_pHYs[5] = {112, 72, 89, 115, '\0'};
-png_byte FARDATA png_sBIT[5] = {115, 66, 73, 84, '\0'};
-png_byte FARDATA png_sRGB[5] = {115, 82, 71, 66, '\0'};
-png_byte FARDATA png_tEXt[5] = {116, 69, 88, 116, '\0'};
-png_byte FARDATA png_tIME[5] = {116, 73, 77, 69, '\0'};
-png_byte FARDATA png_tRNS[5] = {116, 82, 78, 83, '\0'};
-png_byte FARDATA png_zTXt[5] = {122, 84, 88, 116, '\0'};
+#ifdef PNG_READ_SUPPORTED
+/* png_sig was changed to a function in version 1.0.5c */
+/* Place to hold the signature string for a PNG file. */
+PNG_CONST png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+#endif /* PNG_READ_SUPPORTED */
+
+/* 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;
+
+#ifdef PNG_READ_SUPPORTED
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
-int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
-int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
-int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+PNG_CONST int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
-int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
-
-/* Width of interlace block. This is not currently used - if you need
- * it, uncomment it here and in png.h
-int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
-*/
+PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
/* Height of interlace block. This is not currently used - if you need
* it, uncomment it here and in png.h
-int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+PNG_CONST int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
*/
/* Mask to determine which pixels are valid in a pass */
-int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+PNG_CONST int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
/* Mask to determine which pixels to overwrite while displaying */
-int FARDATA png_pass_dsp_mask[] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+PNG_CONST int FARDATA png_pass_dsp_mask[]
+ = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+#endif /* PNG_READ_SUPPORTED */
+#endif /* PNG_USE_GLOBAL_ARRAYS */
/* 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
* stream we can set num_bytes = 8 so that libpng will not attempt to read
* or write any of the magic bytes before it starts on the IHDR.
*/
-void
+
+#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");
+ if (png_ptr == NULL) return;
+ png_debug(1, "in png_set_sig_bytes");
if (num_bytes > 8)
png_error(png_ptr, "Too many bytes for PNG signature.");
- png_ptr->sig_bytes = num_bytes < 0 ? 0 : num_bytes;
+ png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
}
/* Checks whether the supplied bytes match the PNG signature. We allow
* respectively, to be less than, to match, or be greater than the correct
* PNG signature (this is the same behaviour as strcmp, memcmp, etc).
*/
-int
+int PNGAPI
png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
{
+ png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
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_sig[start], num_to_check)));
+ return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
}
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
/* (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.
+ * future - use png_sig_cmp(). Returns true (nonzero) if the file is PNG.
*/
-int
+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
+#endif /* PNG_READ_SUPPORTED */
-/* Function to allocate memory for zlib. */
-voidpf
+#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
png_zalloc(voidpf png_ptr, uInt items, uInt size)
{
- png_uint_32 num_bytes = (png_uint_32)items * size;
- png_voidp ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
+ png_voidp ptr;
+ png_structp p=(png_structp)png_ptr;
+ png_uint_32 save_flags=p->flags;
+ png_uint_32 num_bytes;
+
+ if (png_ptr == NULL) return (NULL);
+ if (items > PNG_UINT_32_MAX/size)
+ {
+ png_warning (p, "Potential overflow in png_zalloc()");
+ return (NULL);
+ }
+ num_bytes = (png_uint_32)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)num_bytes);
}
+#endif
return ((voidpf)ptr);
}
/* function to free memory for zlib */
-void
+#ifdef PNG_1_0_X
+void PNGAPI
+#else
+void /* private */
+#endif
png_zfree(voidpf png_ptr, voidpf ptr)
{
png_free((png_structp)png_ptr, (png_voidp)ptr);
/* Reset the CRC variable to 32 bits of 1's. Care must be taken
* in case CRC is > 32 bits to leave the top bits 0.
*/
-void
+void /* PRIVATE */
png_reset_crc(png_structp png_ptr)
{
png_ptr->crc = crc32(0, Z_NULL, 0);
* also check that this data will actually be used before going to the
* trouble of calculating it.
*/
-void
+void /* PRIVATE */
png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
{
int need_crc = 1;
/* Allocate the memory for an info_struct for the application. We don't
* really need the png_ptr, but it could potentially be useful in the
- * future. This should be used in favour of malloc(sizeof(png_info))
+ * future. This should be used in favour of malloc(png_sizeof(png_info))
* and png_info_init() so that applications that want to use a shared
* libpng don't have to be recompiled if png_info changes size.
*/
-png_infop
+png_infop PNGAPI
png_create_info_struct(png_structp png_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
- if ((info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
- png_ptr->malloc_fn)) != NULL)
+ info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
+ png_ptr->malloc_fn, png_ptr->mem_ptr);
#else
- if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL)
+ info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
#endif
- {
- png_info_init(info_ptr);
- }
+ if (info_ptr != NULL)
+ png_info_init_3(&info_ptr, png_sizeof(png_info));
return (info_ptr);
}
* png_destroy_write_struct() to free an info struct, but this may be
* useful for some applications.
*/
-void
+void PNGAPI
png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
{
png_infop info_ptr = NULL;
+ if (png_ptr == NULL) return;
- png_debug(1, "in png_destroy_info_struct\n");
+ png_debug(1, "in png_destroy_info_struct");
if (info_ptr_ptr != NULL)
info_ptr = *info_ptr_ptr;
png_info_destroy(png_ptr, info_ptr);
#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn);
+ png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
+ png_ptr->mem_ptr);
#else
png_destroy_struct((png_voidp)info_ptr);
#endif
- *info_ptr_ptr = (png_infop)NULL;
+ *info_ptr_ptr = NULL;
}
}
* and applications using it are urged to use png_create_info_struct()
* instead.
*/
-void
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+#undef png_info_init
+void PNGAPI
png_info_init(png_infop info_ptr)
{
- png_debug(1, "in png_info_init\n");
+ /* We only come here via pre-1.0.12-compiled applications */
+ png_info_init_3(&info_ptr, 0);
+}
+#endif
+
+void PNGAPI
+png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
+{
+ png_infop info_ptr = *ptr_ptr;
+
+ if (info_ptr == NULL) return;
+
+ png_debug(1, "in png_info_init_3");
+
+ 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, sizeof (png_info));
+ png_memset(info_ptr, 0, png_sizeof(png_info));
}
-/* This is an internal routine to free any memory that the info struct is
- * pointing to before re-using it or freeing the struct itself. Recall
- * that png_free() checks for NULL pointers for us.
- */
-void
-png_info_destroy(png_structp png_ptr, png_infop info_ptr)
+#ifdef PNG_FREE_ME_SUPPORTED
+void PNGAPI
+png_data_freer(png_structp png_ptr, png_infop info_ptr,
+ int freer, png_uint_32 mask)
{
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
- png_debug(1, "in png_info_destroy\n");
- if (info_ptr->text != NULL)
+ png_debug(1, "in png_data_freer");
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+ if (freer == PNG_DESTROY_WILL_FREE_DATA)
+ info_ptr->free_me |= mask;
+ 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.");
+}
+#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");
+ 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)
{
- int i;
- for (i = 0; i < info_ptr->num_text; i++)
- {
- png_free(png_ptr, info_ptr->text[i].key);
- }
- png_free(png_ptr, info_ptr->text);
+ 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->trans = NULL;
+ info_ptr->valid &= ~PNG_INFO_tRNS;
+#ifndef PNG_FREE_ME_SUPPORTED
+ png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+#endif
+}
+#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
+{
+#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;
+#endif
+ 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;
+}
+#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
-#if defined(PNG_READ_pCAL_SUPPORTED)
- png_free(png_ptr, info_ptr->pcal_purpose);
- png_free(png_ptr, info_ptr->pcal_units);
- if (info_ptr->pcal_params != NULL)
+{
+ 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)
{
- int i;
- for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
+ if (info_ptr->splt_palettes)
{
- png_free(png_ptr, info_ptr->pcal_params[i]);
+ 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;
}
- png_free(png_ptr, info_ptr->pcal_params);
}
+ 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)
+ if (png_ptr->unknown_chunk.data)
+ {
+ png_free(png_ptr, png_ptr->unknown_chunk.data);
+ png_ptr->unknown_chunk.data = NULL;
+ }
+
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_UNKN)
#endif
+{
+ 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);
- png_info_init(info_ptr);
+ 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
+}
+#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;
+}
+
+#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;
+}
+#endif
+
+#ifdef PNG_FREE_ME_SUPPORTED
+ if (num == -1)
+ info_ptr->free_me &= ~mask;
+ else
+ info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
+#endif
+}
+
+/* This is an internal routine to free any memory that the info struct is
+ * pointing to before re-using it or freeing the struct itself. Recall
+ * that png_free() checks for NULL pointers for us.
+ */
+void /* PRIVATE */
+png_info_destroy(png_structp png_ptr, png_infop info_ptr)
+{
+ png_debug(1, "in png_info_destroy");
+
+ png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#if defined(PNG_UNKNOWN_CHUNKS_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;
+ }
+#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
* pointer before png_write_destroy() or png_read_destroy() are called.
*/
-png_voidp
+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_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
#if !defined(PNG_NO_STDIO)
/* 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().
+ * or png_set_write_fn() instead of png_init_io(). If you have defined
+ * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
+ * necessarily available.
*/
-void
-png_init_io(png_structp png_ptr, FILE *fp)
+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
/* Convert the supplied time into an RFC 1123 string suitable for use in
* a "Creation Time" or other text-based time string.
*/
-png_charp
+png_charp PNGAPI
png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
{
static PNG_CONST char short_months[12][4] =
{"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*
- sizeof(char)));
+ 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",
- ptime->day % 32, short_months[(ptime->month - 1) % 12],
- ptime->year, ptime->hour % 24, ptime->minute % 60,
- ptime->second % 61);
+ 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);
png_memcpy(png_ptr->time_buffer, near_time_buf,
- 29*sizeof(char));
+ 29*png_sizeof(char));
}
#else
- sprintf(png_ptr->time_buffer, "%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);
+ 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 */
-png_charp
+#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("\n libpng version 1.0.3 - January 14, 1999\n\
- Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
- Copyright (c) 1996, 1997 Andreas Dilger\n\
- Copyright (c) 1998, 1999, Glenn Randers-Pehrson\n");
+ png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
+ return ((png_charp) "\n libpng version 1.2.34 - December 18, 2008\n\
+ Copyright (c) 1998-2008 Glenn Randers-Pehrson\n\
+ Copyright (c) 1996-1997 Andreas Dilger\n\
+ Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
+}
+
+/* The following return the library version as a short string in the
+ * format 1.0.0 through 99.99.99zz. To get the version of *.h files
+ * used with your application, print out PNG_LIBPNG_VER_STRING, which
+ * is defined in png.h.
+ * Note: now there is no difference between png_get_libpng_ver() and
+ * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard,
+ * it is guaranteed that png.c uses the correct version of png.h.
+ */
+png_charp PNGAPI
+png_get_libpng_ver(png_structp png_ptr)
+{
+ /* Version of *.c files used when building libpng */
+ 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 */
+ 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 */
+ png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
+ return ((png_charp) PNG_HEADER_VERSION_STRING
+#ifndef PNG_READ_SUPPORTED
+ " (NO READ SUPPORT)"
+#endif
+ "\n");
+}
+
+#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 */
+ int i;
+ png_bytep p;
+ 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)
+ if (!png_memcmp(chunk_name, p, 4))
+ return ((int)*(p + 4));
+ return 0;
+}
+#endif
+
+/* 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 /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
+
+/* This function was added to libpng-1.0.7 */
+png_uint_32 PNGAPI
+png_access_version_number(void)
+{
+ /* Version of *.c files used when building libpng */
+ return((png_uint_32) PNG_LIBPNG_VER);
+}
+
+
+#if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+#if !defined(PNG_1_0_X)
+/* this function was added to libpng 1.2.0 */
+int PNGAPI
+png_mmx_support(void)
+{
+ /* obsolete, to be removed from libpng-1.4.0 */
+ return -1;
+}
+#endif /* PNG_1_0_X */
+#endif /* PNG_READ_SUPPORTED && PNG_ASSEMBLER_CODE_SUPPORTED */
+
+#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);
+}
+#endif /* PNG_SIZE_T */
+
+/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */
+#if defined(PNG_cHRM_SUPPORTED)
+#if !defined(PNG_NO_CHECK_cHRM)
+/*
+ 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 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 /* NO_PNG_CHECK_cHRM */
+#endif /* PNG_cHRM_SUPPORTED */
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
projects / wxWidgets.git / blobdiff