XFA: Upgrade libpng to 1.6.20.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1591483003 .

1 files changed, 0 insertions, 931 deletions

diff --git a/third_party/lpng_v163/pngerror.c b/third_party/lpng_v163/pngerror.c
deleted file mode 100644
index 2125e4ca11..0000000000
--- a/third_party/lpng_v163/pngerror.c
+++ /dev/null
@@ -1,931 +0,0 @@
-/* pngerror.c - stub functions for i/o and memory allocation

- *

- * Last changed in libpng 1.6.1 [March 28, 2013]

- * Copyright (c) 1998-2013 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 error handling.  Users who

- * need special error handling are expected to write replacement functions

- * and use png_set_error_fn() to use those functions.  See the instructions

- * at each function.

- */

-

-#include "pngpriv.h"

-

-#if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

-

-static PNG_FUNCTION(void, png_default_error,PNGARG((png_const_structrp png_ptr,

-    png_const_charp error_message)),PNG_NORETURN);

-

-#ifdef PNG_WARNINGS_SUPPORTED

-static void /* PRIVATE */

-png_default_warning PNGARG((png_const_structrp png_ptr,

-   png_const_charp warning_message));

-#endif /* PNG_WARNINGS_SUPPORTED */

-

-/* This function is called whenever there is a fatal error.  This function

- * should not be changed.  If there is a need to handle errors differently,

- * you should supply a replacement error function and use png_set_error_fn()

- * to replace the error function at run-time.

- */

-#ifdef PNG_ERROR_TEXT_SUPPORTED

-PNG_FUNCTION(void,PNGAPI

-png_error,(png_const_structrp png_ptr, png_const_charp error_message),

-   PNG_NORETURN)

-{

-#ifdef PNG_ERROR_NUMBERS_SUPPORTED

-   char msg[16];

-   if (png_ptr != NULL)

-   {

-      if (png_ptr->flags&

-         (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))

-      {

-         if (*error_message == PNG_LITERAL_SHARP)

-         {

-            /* Strip "#nnnn " from beginning of error message. */

-            int offset;

-            for (offset = 1; offset<15; offset++)

-               if (error_message[offset] == ' ')

-                  break;

-

-            if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)

-            {

-               int i;

-               for (i = 0; i < offset - 1; i++)

-                  msg[i] = error_message[i + 1];

-               msg[i - 1] = '\0';

-               error_message = msg;

-            }

-

-            else

-               error_message += offset;

-      }

-

-      else

-      {

-         if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)

-         {

-            msg[0] = '0';

-            msg[1] = '\0';

-            error_message = msg;

-         }

-       }

-     }

-   }

-#endif

-   if (png_ptr != NULL && png_ptr->error_fn != NULL)

-      (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr),

-          error_message);

-

-   /* If the custom handler doesn't exist, or if it returns,

-      use the default handler, which will not return. */

-   png_default_error(png_ptr, error_message);

-}

-#else

-PNG_FUNCTION(void,PNGAPI

-png_err,(png_const_structrp png_ptr),PNG_NORETURN)

-{

-   /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed

-    * erroneously as '\0', instead of the empty string "".  This was

-    * apparently an error, introduced in libpng-1.2.20, and png_default_error

-    * will crash in this case.

-    */

-   if (png_ptr != NULL && png_ptr->error_fn != NULL)

-      (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), "");

-

-   /* If the custom handler doesn't exist, or if it returns,

-      use the default handler, which will not return. */

-   png_default_error(png_ptr, "");

-}

-#endif /* PNG_ERROR_TEXT_SUPPORTED */

-

-/* Utility to safely appends strings to a buffer.  This never errors out so

- * error checking is not required in the caller.

- */

-size_t

-png_safecat(png_charp buffer, size_t bufsize, size_t pos,

-   png_const_charp string)

-{

-   if (buffer != NULL && pos < bufsize)

-   {

-      if (string != NULL)

-         while (*string != '\0' && pos < bufsize-1)

-           buffer[pos++] = *string++;

-

-      buffer[pos] = '\0';

-   }

-

-   return pos;

-}

-

-#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)

-/* Utility to dump an unsigned value into a buffer, given a start pointer and

- * and end pointer (which should point just *beyond* the end of the buffer!)

- * Returns the pointer to the start of the formatted string.

- */

-png_charp

-png_format_number(png_const_charp start, png_charp end, int format,

-   png_alloc_size_t number)

-{

-   int count = 0;    /* number of digits output */

-   int mincount = 1; /* minimum number required */

-   int output = 0;   /* digit output (for the fixed point format) */

-

-   *--end = '\0';

-

-   /* This is written so that the loop always runs at least once, even with

-    * number zero.

-    */

-   while (end > start && (number != 0 || count < mincount))

-   {

-

-      static const char digits[] = "0123456789ABCDEF";

-

-      switch (format)

-      {

-         case PNG_NUMBER_FORMAT_fixed:

-            /* Needs five digits (the fraction) */

-            mincount = 5;

-            if (output || number % 10 != 0)

-            {

-               *--end = digits[number % 10];

-               output = 1;

-            }

-            number /= 10;

-            break;

-

-         case PNG_NUMBER_FORMAT_02u:

-            /* Expects at least 2 digits. */

-            mincount = 2;

-            /* FALL THROUGH */

-

-         case PNG_NUMBER_FORMAT_u:

-            *--end = digits[number % 10];

-            number /= 10;

-            break;

-

-         case PNG_NUMBER_FORMAT_02x:

-            /* This format expects at least two digits */

-            mincount = 2;

-            /* FALL THROUGH */

-

-         case PNG_NUMBER_FORMAT_x:

-            *--end = digits[number & 0xf];

-            number >>= 4;

-            break;

-

-         default: /* an error */

-            number = 0;

-            break;

-      }

-

-      /* Keep track of the number of digits added */

-      ++count;

-

-      /* Float a fixed number here: */

-      if (format == PNG_NUMBER_FORMAT_fixed) if (count == 5) if (end > start)

-      {

-         /* End of the fraction, but maybe nothing was output?  In that case

-          * drop the decimal point.  If the number is a true zero handle that

-          * here.

-          */

-         if (output)

-            *--end = '.';

-         else if (number == 0) /* and !output */

-            *--end = '0';

-      }

-   }

-

-   return end;

-}

-#endif

-

-#ifdef PNG_WARNINGS_SUPPORTED

-/* This function is called whenever there is a non-fatal error.  This function

- * should not be changed.  If there is a need to handle warnings differently,

- * you should supply a replacement warning function and use

- * png_set_error_fn() to replace the warning function at run-time.

- */

-void PNGAPI

-png_warning(png_const_structrp png_ptr, png_const_charp warning_message)

-{

-   int offset = 0;

-   if (png_ptr != NULL)

-   {

-#ifdef PNG_ERROR_NUMBERS_SUPPORTED

-   if (png_ptr->flags&

-       (PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))

-#endif

-      {

-         if (*warning_message == PNG_LITERAL_SHARP)

-         {

-            for (offset = 1; offset < 15; offset++)

-               if (warning_message[offset] == ' ')

-                  break;

-         }

-      }

-   }

-   if (png_ptr != NULL && png_ptr->warning_fn != NULL)

-      (*(png_ptr->warning_fn))(png_constcast(png_structrp,png_ptr),

-         warning_message + offset);

-   else

-      png_default_warning(png_ptr, warning_message + offset);

-}

-

-/* These functions support 'formatted' warning messages with up to

- * PNG_WARNING_PARAMETER_COUNT parameters.  In the format string the parameter

- * is introduced by @<number>, where 'number' starts at 1.  This follows the

- * standard established by X/Open for internationalizable error messages.

- */

-void

-png_warning_parameter(png_warning_parameters p, int number,

-   png_const_charp string)

-{

-   if (number > 0 && number <= PNG_WARNING_PARAMETER_COUNT)

-      (void)png_safecat(p[number-1], (sizeof p[number-1]), 0, string);

-}

-

-void

-png_warning_parameter_unsigned(png_warning_parameters p, int number, int format,

-   png_alloc_size_t value)

-{

-   char buffer[PNG_NUMBER_BUFFER_SIZE];

-   png_warning_parameter(p, number, PNG_FORMAT_NUMBER(buffer, format, value));

-}

-

-void

-png_warning_parameter_signed(png_warning_parameters p, int number, int format,

-   png_int_32 value)

-{

-   png_alloc_size_t u;

-   png_charp str;

-   char buffer[PNG_NUMBER_BUFFER_SIZE];

-

-   /* Avoid overflow by doing the negate in a png_alloc_size_t: */

-   u = (png_alloc_size_t)value;

-   if (value < 0)

-      u = ~u + 1;

-

-   str = PNG_FORMAT_NUMBER(buffer, format, u);

-

-   if (value < 0 && str > buffer)

-      *--str = '-';

-

-   png_warning_parameter(p, number, str);

-}

-

-void

-png_formatted_warning(png_const_structrp png_ptr, png_warning_parameters p,

-   png_const_charp message)

-{

-   /* The internal buffer is just 192 bytes - enough for all our messages,

-    * overflow doesn't happen because this code checks!  If someone figures

-    * out how to send us a message longer than 192 bytes, all that will

-    * happen is that the message will be truncated appropriately.

-    */

-   size_t i = 0; /* Index in the msg[] buffer: */

-   char msg[192];

-

-   /* Each iteration through the following loop writes at most one character

-    * to msg[i++] then returns here to validate that there is still space for

-    * the trailing '\0'.  It may (in the case of a parameter) read more than

-    * one character from message[]; it must check for '\0' and continue to the

-    * test if it finds the end of string.

-    */

-   while (i<(sizeof msg)-1 && *message != '\0')

-   {

-      /* '@' at end of string is now just printed (previously it was skipped);

-       * it is an error in the calling code to terminate the string with @.

-       */

-      if (p != NULL && *message == '@' && message[1] != '\0')

-      {

-         int parameter_char = *++message; /* Consume the '@' */

-         static const char valid_parameters[] = "123456789";

-         int parameter = 0;

-

-         /* Search for the parameter digit, the index in the string is the

-          * parameter to use.

-          */

-         while (valid_parameters[parameter] != parameter_char &&

-            valid_parameters[parameter] != '\0')

-            ++parameter;

-

-         /* If the parameter digit is out of range it will just get printed. */

-         if (parameter < PNG_WARNING_PARAMETER_COUNT)

-         {

-            /* Append this parameter */

-            png_const_charp parm = p[parameter];

-            png_const_charp pend = p[parameter] + (sizeof p[parameter]);

-

-            /* No need to copy the trailing '\0' here, but there is no guarantee

-             * that parm[] has been initialized, so there is no guarantee of a

-             * trailing '\0':

-             */

-            while (i<(sizeof msg)-1 && *parm != '\0' && parm < pend)

-               msg[i++] = *parm++;

-

-            /* Consume the parameter digit too: */

-            ++message;

-            continue;

-         }

-

-         /* else not a parameter and there is a character after the @ sign; just

-          * copy that.  This is known not to be '\0' because of the test above.

-          */

-      }

-

-      /* At this point *message can't be '\0', even in the bad parameter case

-       * above where there is a lone '@' at the end of the message string.

-       */

-      msg[i++] = *message++;

-   }

-

-   /* i is always less than (sizeof msg), so: */

-   msg[i] = '\0';

-

-   /* And this is the formatted message. It may be larger than

-    * PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these

-    * are not (currently) formatted.

-    */

-   png_warning(png_ptr, msg);

-}

-#endif /* PNG_WARNINGS_SUPPORTED */

-

-#ifdef PNG_BENIGN_ERRORS_SUPPORTED

-void PNGAPI

-png_benign_error(png_const_structrp png_ptr, png_const_charp error_message)

-{

-   if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)

-   {

-#     ifdef PNG_READ_SUPPORTED

-         if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&

-            png_ptr->chunk_name != 0)

-            png_chunk_warning(png_ptr, error_message);

-         else

-#     endif

-      png_warning(png_ptr, error_message);

-   }

-

-   else

-   {

-#     ifdef PNG_READ_SUPPORTED

-         if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 &&

-            png_ptr->chunk_name != 0)

-            png_chunk_error(png_ptr, error_message);

-         else

-#     endif

-      png_error(png_ptr, error_message);

-   }

-}

-

-void /* PRIVATE */

-png_app_warning(png_const_structrp png_ptr, png_const_charp error_message)

-{

-  if (png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN)

-     png_warning(png_ptr, error_message);

-  else

-     png_error(png_ptr, error_message);

-}

-

-void /* PRIVATE */

-png_app_error(png_const_structrp png_ptr, png_const_charp error_message)

-{

-  if (png_ptr->flags & PNG_FLAG_APP_ERRORS_WARN)

-     png_warning(png_ptr, error_message);

-  else

-     png_error(png_ptr, error_message);

-}

-#endif /* BENIGN_ERRORS */

-

-/* These utilities are used internally to build an error message that relates

- * to the current chunk.  The chunk name comes from png_ptr->chunk_name,

- * this is used to prefix the message.  The message is limited in length

- * to 63 bytes, the name characters are output as hex digits wrapped in []

- * if the character is invalid.

- */

-#define isnonalpha(c) ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97))

-static PNG_CONST char png_digit[16] = {

-   '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',

-   'A', 'B', 'C', 'D', 'E', 'F'

-};

-

-#define PNG_MAX_ERROR_TEXT 196 /* Currently limited be profile_error in png.c */

-#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED)

-static void /* PRIVATE */

-png_format_buffer(png_const_structrp png_ptr, png_charp buffer, png_const_charp

-    error_message)

-{

-   png_uint_32 chunk_name = png_ptr->chunk_name;

-   int iout = 0, ishift = 24;

-

-   while (ishift >= 0)

-   {

-      int c = (int)(chunk_name >> ishift) & 0xff;

-

-      ishift -= 8;

-      if (isnonalpha(c))

-      {

-         buffer[iout++] = PNG_LITERAL_LEFT_SQUARE_BRACKET;

-         buffer[iout++] = png_digit[(c & 0xf0) >> 4];

-         buffer[iout++] = png_digit[c & 0x0f];

-         buffer[iout++] = PNG_LITERAL_RIGHT_SQUARE_BRACKET;

-      }

-

-      else

-      {

-         buffer[iout++] = (char)c;

-      }

-   }

-

-   if (error_message == NULL)

-      buffer[iout] = '\0';

-

-   else

-   {

-      int iin = 0;

-

-      buffer[iout++] = ':';

-      buffer[iout++] = ' ';

-

-      while (iin < PNG_MAX_ERROR_TEXT-1 && error_message[iin] != '\0')

-         buffer[iout++] = error_message[iin++];

-

-      /* iin < PNG_MAX_ERROR_TEXT, so the following is safe: */

-      buffer[iout] = '\0';

-   }

-}

-#endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */

-

-#if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)

-PNG_FUNCTION(void,PNGAPI

-png_chunk_error,(png_const_structrp png_ptr, png_const_charp error_message),

-   PNG_NORETURN)

-{

-   char msg[18+PNG_MAX_ERROR_TEXT];

-   if (png_ptr == NULL)

-      png_error(png_ptr, error_message);

-

-   else

-   {

-      png_format_buffer(png_ptr, msg, error_message);

-      png_error(png_ptr, msg);

-   }

-}

-#endif /* PNG_READ_SUPPORTED && PNG_ERROR_TEXT_SUPPORTED */

-

-#ifdef PNG_WARNINGS_SUPPORTED

-void PNGAPI

-png_chunk_warning(png_const_structrp png_ptr, png_const_charp warning_message)

-{

-   char msg[18+PNG_MAX_ERROR_TEXT];

-   if (png_ptr == NULL)

-      png_warning(png_ptr, warning_message);

-

-   else

-   {

-      png_format_buffer(png_ptr, msg, warning_message);

-      png_warning(png_ptr, msg);

-   }

-}

-#endif /* PNG_WARNINGS_SUPPORTED */

-

-#ifdef PNG_READ_SUPPORTED

-#ifdef PNG_BENIGN_ERRORS_SUPPORTED

-void PNGAPI

-png_chunk_benign_error(png_const_structrp png_ptr, png_const_charp

-    error_message)

-{

-   if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN)

-      png_chunk_warning(png_ptr, error_message);

-

-   else

-      png_chunk_error(png_ptr, error_message);

-}

-#endif

-#endif /* PNG_READ_SUPPORTED */

-

-void /* PRIVATE */

-png_chunk_report(png_const_structrp png_ptr, png_const_charp message, int error)

-{

-   /* This is always supported, but for just read or just write it

-    * unconditionally does the right thing.

-    */

-#  if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)

-      if (png_ptr->mode & PNG_IS_READ_STRUCT)

-#  endif

-

-#  ifdef PNG_READ_SUPPORTED

-      {

-         if (error < PNG_CHUNK_ERROR)

-            png_chunk_warning(png_ptr, message);

-

-         else

-            png_chunk_benign_error(png_ptr, message);

-      }

-#  endif

-

-#  if defined(PNG_READ_SUPPORTED) && defined(PNG_WRITE_SUPPORTED)

-      else if (!(png_ptr->mode & PNG_IS_READ_STRUCT))

-#  endif

-

-#  ifdef PNG_WRITE_SUPPORTED

-      {

-         if (error < PNG_CHUNK_WRITE_ERROR)

-            png_app_warning(png_ptr, message);

-

-         else

-            png_app_error(png_ptr, message);

-      }

-#  endif

-}

-

-#ifdef PNG_ERROR_TEXT_SUPPORTED

-#ifdef PNG_FLOATING_POINT_SUPPORTED

-PNG_FUNCTION(void,

-png_fixed_error,(png_const_structrp png_ptr, png_const_charp name),PNG_NORETURN)

-{

-#  define fixed_message "fixed point overflow in "

-#  define fixed_message_ln ((sizeof fixed_message)-1)

-   int  iin;

-   char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT];

-   memcpy(msg, fixed_message, fixed_message_ln);

-   iin = 0;

-   if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0)

-   {

-      msg[fixed_message_ln + iin] = name[iin];

-      ++iin;

-   }

-   msg[fixed_message_ln + iin] = 0;

-   png_error(png_ptr, msg);

-}

-#endif

-#endif

-

-#ifdef PNG_SETJMP_SUPPORTED

-/* This API only exists if ANSI-C style error handling is used,

- * otherwise it is necessary for png_default_error to be overridden.

- */

-jmp_buf* PNGAPI

-png_set_longjmp_fn(png_structrp png_ptr, png_longjmp_ptr longjmp_fn,

-    size_t jmp_buf_size)

-{

-   /* From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value

-    * and it must not change after that.  Libpng doesn't care how big the

-    * buffer is, just that it doesn't change.

-    *

-    * If the buffer size is no *larger* than the size of jmp_buf when libpng is

-    * compiled a built in jmp_buf is returned; this preserves the pre-1.6.0

-    * semantics that this call will not fail.  If the size is larger, however,

-    * the buffer is allocated and this may fail, causing the function to return

-    * NULL.

-    */

-   if (png_ptr == NULL)

-      return NULL;

-

-   if (png_ptr->jmp_buf_ptr == NULL)

-   {

-      png_ptr->jmp_buf_size = 0; /* not allocated */

-

-      if (jmp_buf_size <= (sizeof png_ptr->jmp_buf_local))

-         png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local;

-

-      else

-      {

-         png_ptr->jmp_buf_ptr = png_voidcast(jmp_buf *,

-            png_malloc_warn(png_ptr, jmp_buf_size));

-

-         if (png_ptr->jmp_buf_ptr == NULL)

-            return NULL; /* new NULL return on OOM */

-

-         png_ptr->jmp_buf_size = jmp_buf_size;

-      }

-   }

-

-   else /* Already allocated: check the size */

-   {

-      size_t size = png_ptr->jmp_buf_size;

-

-      if (size == 0)

-      {

-         size = (sizeof png_ptr->jmp_buf_local);

-         if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local)

-         {

-            /* This is an internal error in libpng: somehow we have been left

-             * with a stack allocated jmp_buf when the application regained

-             * control.  It's always possible to fix this up, but for the moment

-             * this is a png_error because that makes it easy to detect.

-             */

-            png_error(png_ptr, "Libpng jmp_buf still allocated");

-            /* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */

-         }

-      }

-

-      if (size != jmp_buf_size)

-      {

-         png_warning(png_ptr, "Application jmp_buf size changed");

-         return NULL; /* caller will probably crash: no choice here */

-      }

-   }

-

-   /* Finally fill in the function, now we have a satisfactory buffer. It is

-    * valid to change the function on every call.

-    */

-   png_ptr->longjmp_fn = longjmp_fn;

-   return png_ptr->jmp_buf_ptr;

-}

-

-void /* PRIVATE */

-png_free_jmpbuf(png_structrp png_ptr)

-{

-   if (png_ptr != NULL)

-   {

-      jmp_buf *jb = png_ptr->jmp_buf_ptr;

-

-      /* A size of 0 is used to indicate a local, stack, allocation of the

-       * pointer; used here and in png.c

-       */

-      if (jb != NULL && png_ptr->jmp_buf_size > 0)

-      {

-

-         /* This stuff is so that a failure to free the error control structure

-          * does not leave libpng in a state with no valid error handling: the

-          * free always succeeds, if there is an error it gets ignored.

-          */

-         if (jb != &png_ptr->jmp_buf_local)

-         {

-            /* Make an internal, libpng, jmp_buf to return here */

-            jmp_buf free_jmp_buf;

-

-            if (!setjmp(free_jmp_buf))

-            {

-               png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */

-               png_ptr->jmp_buf_size = 0; /* stack allocation */

-               png_ptr->longjmp_fn = longjmp;

-               png_free(png_ptr, jb); /* Return to setjmp on error */

-            }

-         }

-      }

-

-      /* *Always* cancel everything out: */

-      png_ptr->jmp_buf_size = 0;

-      png_ptr->jmp_buf_ptr = NULL;

-      png_ptr->longjmp_fn = 0;

-   }

-}

-#endif

-

-/* This is the default error handling function.  Note that replacements for

- * this function MUST NOT RETURN, or the program will likely crash.  This

- * function is used by default, or if the program supplies NULL for the

- * error function pointer in png_set_error_fn().

- */

-static PNG_FUNCTION(void /* PRIVATE */,

-png_default_error,(png_const_structrp png_ptr, png_const_charp error_message),

-   PNG_NORETURN)

-{

-#ifdef PNG_CONSOLE_IO_SUPPORTED

-#ifdef PNG_ERROR_NUMBERS_SUPPORTED

-   /* Check on NULL only added in 1.5.4 */

-   if (error_message != NULL && *error_message == PNG_LITERAL_SHARP)

-   {

-      /* Strip "#nnnn " from beginning of error message. */

-      int offset;

-      char error_number[16];

-      for (offset = 0; offset<15; offset++)

-      {

-         error_number[offset] = error_message[offset + 1];

-         if (error_message[offset] == ' ')

-            break;

-      }

-

-      if ((offset > 1) && (offset < 15))

-      {

-         error_number[offset - 1] = '\0';

-         fprintf(stderr, "libpng error no. %s: %s",

-             error_number, error_message + offset + 1);

-         fprintf(stderr, PNG_STRING_NEWLINE);

-      }

-

-      else

-      {

-         fprintf(stderr, "libpng error: %s, offset=%d",

-             error_message, offset);

-         fprintf(stderr, PNG_STRING_NEWLINE);

-      }

-   }

-   else

-#endif

-   {

-      fprintf(stderr, "libpng error: %s", error_message ? error_message :

-         "undefined");

-      fprintf(stderr, PNG_STRING_NEWLINE);

-   }

-#else

-   PNG_UNUSED(error_message) /* Make compiler happy */

-#endif

-   png_longjmp(png_ptr, 1);

-}

-

-PNG_FUNCTION(void,PNGAPI

-png_longjmp,(png_const_structrp png_ptr, int val),PNG_NORETURN)

-{

-#ifdef PNG_SETJMP_SUPPORTED

-   if (png_ptr && png_ptr->longjmp_fn && png_ptr->jmp_buf_ptr)

-      png_ptr->longjmp_fn(*png_ptr->jmp_buf_ptr, val);

-#endif

-

-   /* Here if not setjmp support or if png_ptr is null. */

-   PNG_ABORT();

-}

-

-#ifdef PNG_WARNINGS_SUPPORTED

-/* This function is called when there is a warning, but the library thinks

- * it can continue anyway.  Replacement functions don't have to do anything

- * here if you don't want them to.  In the default configuration, png_ptr is

- * not used, but it is passed in case it may be useful.

- */

-static void /* PRIVATE */

-png_default_warning(png_const_structrp png_ptr, png_const_charp warning_message)

-{

-#ifdef PNG_CONSOLE_IO_SUPPORTED

-#  ifdef PNG_ERROR_NUMBERS_SUPPORTED

-   if (*warning_message == PNG_LITERAL_SHARP)

-   {

-      int offset;

-      char warning_number[16];

-      for (offset = 0; offset < 15; offset++)

-      {

-         warning_number[offset] = warning_message[offset + 1];

-         if (warning_message[offset] == ' ')

-            break;

-      }

-

-      if ((offset > 1) && (offset < 15))

-      {

-         warning_number[offset + 1] = '\0';

-         fprintf(stderr, "libpng warning no. %s: %s",

-             warning_number, warning_message + offset);

-         fprintf(stderr, PNG_STRING_NEWLINE);

-      }

-

-      else

-      {

-         fprintf(stderr, "libpng warning: %s",

-             warning_message);

-         fprintf(stderr, PNG_STRING_NEWLINE);

-      }

-   }

-   else

-#  endif

-

-   {

-      fprintf(stderr, "libpng warning: %s", warning_message);

-      fprintf(stderr, PNG_STRING_NEWLINE);

-   }

-#else

-   PNG_UNUSED(warning_message) /* Make compiler happy */

-#endif

-   PNG_UNUSED(png_ptr) /* Make compiler happy */

-}

-#endif /* PNG_WARNINGS_SUPPORTED */

-

-/* This function is called when the application wants to use another method

- * of handling errors and warnings.  Note that the error function MUST NOT

- * return to the calling routine or serious problems will occur.  The return

- * method used in the default routine calls longjmp(png_ptr->jmp_buf_ptr, 1)

- */

-void PNGAPI

-png_set_error_fn(png_structrp png_ptr, png_voidp error_ptr,

-    png_error_ptr error_fn, png_error_ptr warning_fn)

-{

-   if (png_ptr == NULL)

-      return;

-

-   png_ptr->error_ptr = error_ptr;

-   png_ptr->error_fn = error_fn;

-#ifdef PNG_WARNINGS_SUPPORTED

-   png_ptr->warning_fn = warning_fn;

-#else

-   PNG_UNUSED(warning_fn)

-#endif

-}

-

-

-/* This function returns a pointer to the error_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_error_ptr(png_const_structrp png_ptr)

-{

-   if (png_ptr == NULL)

-      return NULL;

-

-   return ((png_voidp)png_ptr->error_ptr);

-}

-

-

-#ifdef PNG_ERROR_NUMBERS_SUPPORTED

-void PNGAPI

-png_set_strip_error_numbers(png_structrp png_ptr, png_uint_32 strip_mode)

-{

-   if (png_ptr != NULL)

-   {

-      png_ptr->flags &=

-         ((~(PNG_FLAG_STRIP_ERROR_NUMBERS |

-         PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);

-   }

-}

-#endif

-

-#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\

-   defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)

-   /* Currently the above both depend on SETJMP_SUPPORTED, however it would be

-    * possible to implement without setjmp support just so long as there is some

-    * way to handle the error return here:

-    */

-PNG_FUNCTION(void /* PRIVATE */,

-png_safe_error,(png_structp png_nonconst_ptr, png_const_charp error_message),

-   PNG_NORETURN)

-{

-   const png_const_structrp png_ptr = png_nonconst_ptr;

-   png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);

-

-   /* An error is always logged here, overwriting anything (typically a warning)

-    * that is already there:

-    */

-   if (image != NULL)

-   {

-      png_safecat(image->message, (sizeof image->message), 0, error_message);

-      image->warning_or_error |= PNG_IMAGE_ERROR;

-

-      /* Retrieve the jmp_buf from within the png_control, making this work for

-       * C++ compilation too is pretty tricky: C++ wants a pointer to the first

-       * element of a jmp_buf, but C doesn't tell us the type of that.

-       */

-      if (image->opaque != NULL && image->opaque->error_buf != NULL)

-         longjmp(png_control_jmp_buf(image->opaque), 1);

-

-      /* Missing longjmp buffer, the following is to help debugging: */

-      {

-         size_t pos = png_safecat(image->message, (sizeof image->message), 0,

-            "bad longjmp: ");

-         png_safecat(image->message, (sizeof image->message), pos,

-             error_message);

-      }

-   }

-

-   /* Here on an internal programming error. */

-   abort();

-}

-

-#ifdef PNG_WARNINGS_SUPPORTED

-void /* PRIVATE */

-png_safe_warning(png_structp png_nonconst_ptr, png_const_charp warning_message)

-{

-   const png_const_structrp png_ptr = png_nonconst_ptr;

-   png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr);

-

-   /* A warning is only logged if there is no prior warning or error. */

-   if (image->warning_or_error == 0)

-   {

-      png_safecat(image->message, (sizeof image->message), 0, warning_message);

-      image->warning_or_error |= PNG_IMAGE_WARNING;

-   }

-}

-#endif

-

-int /* PRIVATE */

-png_safe_execute(png_imagep image_in, int (*function)(png_voidp), png_voidp arg)

-{

-   volatile png_imagep image = image_in;

-   volatile int result;

-   volatile png_voidp saved_error_buf;

-   jmp_buf safe_jmpbuf;

-

-   /* Safely execute function(arg) with png_error returning to this function. */

-   saved_error_buf = image->opaque->error_buf;

-   result = setjmp(safe_jmpbuf) == 0;

-

-   if (result)

-   {

-

-      image->opaque->error_buf = safe_jmpbuf;

-      result = function(arg);

-   }

-

-   image->opaque->error_buf = saved_error_buf;

-

-   /* And do the cleanup prior to any failure return. */

-   if (!result)

-      png_image_free(image);

-

-   return result;

-}

-#endif /* SIMPLIFIED READ/WRITE */

-#endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */