Drop useless 3rd party files from nedmalloc and png

Part of #5272

7 files changed, 0 insertions, 1515 deletions

diff --git a/drivers/nedmalloc/Benchmarks.xls b/drivers/nedmalloc/Benchmarks.xls
deleted file mode 100644
index 5001a18a22..0000000000
--- a/drivers/nedmalloc/Benchmarks.xls
+++ /dev/null
diff --git a/drivers/nedmalloc/SCsub b/drivers/nedmalloc/SCsub
index 8e6edd1f96..6699efef75 100644
--- a/drivers/nedmalloc/SCsub
+++ b/drivers/nedmalloc/SCsub
@@ -2,4 +2,3 @@ Import('env')
 Export('env');
 
 env.add_source_files(env.drivers_sources,"*.cpp")
-#env.add_source_files(env.drivers_sources,"*.c")
diff --git a/drivers/nedmalloc/nedmalloc.sln b/drivers/nedmalloc/nedmalloc.sln
deleted file mode 100644
index 6ffd9fb83f..0000000000
--- a/drivers/nedmalloc/nedmalloc.sln
+++ /dev/null
@@ -1,19 +0,0 @@
-Microsoft Visual Studio Solution File, Format Version 10.00

-# Visual Studio 2008

-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "nedmalloc", "nedmalloc.vcproj", "{B89384F5-360B-4AB2-8F43-2F5F98A947FE}"

-EndProject

-Global

-	GlobalSection(SolutionConfigurationPlatforms) = preSolution

-		Debug|Win32 = Debug|Win32

-		Release|Win32 = Release|Win32

-	EndGlobalSection

-	GlobalSection(ProjectConfigurationPlatforms) = postSolution

-		{B89384F5-360B-4AB2-8F43-2F5F98A947FE}.Debug|Win32.ActiveCfg = Debug|Win32

-		{B89384F5-360B-4AB2-8F43-2F5F98A947FE}.Debug|Win32.Build.0 = Debug|Win32

-		{B89384F5-360B-4AB2-8F43-2F5F98A947FE}.Release|Win32.ActiveCfg = Release|Win32

-		{B89384F5-360B-4AB2-8F43-2F5F98A947FE}.Release|Win32.Build.0 = Release|Win32

-	EndGlobalSection

-	GlobalSection(SolutionProperties) = preSolution

-		HideSolutionNode = FALSE

-	EndGlobalSection

-EndGlobal

diff --git a/drivers/nedmalloc/nedmalloc.vcproj b/drivers/nedmalloc/nedmalloc.vcproj
deleted file mode 100644
index c5b0563d4f..0000000000
--- a/drivers/nedmalloc/nedmalloc.vcproj
+++ /dev/null
@@ -1,259 +0,0 @@
-<?xml version="1.0" encoding="Windows-1252"?>

-<VisualStudioProject

-	ProjectType="Visual C++"

-	Version="9.00"

-	Name="nedmalloc"

-	ProjectGUID="{B89384F5-360B-4AB2-8F43-2F5F98A947FE}"

-	Keyword="Win32Proj"

-	TargetFrameworkVersion="131072"

-	>

-	<Platforms>

-		<Platform

-			Name="Win32"

-		/>

-	</Platforms>

-	<ToolFiles>

-	</ToolFiles>

-	<Configurations>

-		<Configuration

-			Name="Debug|Win32"

-			OutputDirectory="Debug"

-			IntermediateDirectory="Debug"

-			ConfigurationType="1"

-			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"

-			CharacterSet="2"

-			>

-			<Tool

-				Name="VCPreBuildEventTool"

-			/>

-			<Tool

-				Name="VCCustomBuildTool"

-			/>

-			<Tool

-				Name="VCXMLDataGeneratorTool"

-			/>

-			<Tool

-				Name="VCWebServiceProxyGeneratorTool"

-			/>

-			<Tool

-				Name="VCMIDLTool"

-			/>

-			<Tool

-				Name="VCCLCompilerTool"

-				Optimization="0"

-				PreprocessorDefinitions="WIN32;_DEBUG;_CONSOLE"

-				MinimalRebuild="true"

-				BasicRuntimeChecks="3"

-				RuntimeLibrary="3"

-				UsePrecompiledHeader="0"

-				WarningLevel="3"

-				Detect64BitPortabilityProblems="false"

-				DebugInformationFormat="4"

-			/>

-			<Tool

-				Name="VCManagedResourceCompilerTool"

-			/>

-			<Tool

-				Name="VCResourceCompilerTool"

-			/>

-			<Tool

-				Name="VCPreLinkEventTool"

-			/>

-			<Tool

-				Name="VCLinkerTool"

-				OutputFile="$(OutDir)/nedmalloc.exe"

-				LinkIncremental="2"

-				GenerateDebugInformation="true"

-				ProgramDatabaseFile="$(OutDir)/nedmalloc.pdb"

-				SubSystem="1"

-				RandomizedBaseAddress="1"

-				DataExecutionPrevention="0"

-				TargetMachine="1"

-			/>

-			<Tool

-				Name="VCALinkTool"

-			/>

-			<Tool

-				Name="VCManifestTool"

-			/>

-			<Tool

-				Name="VCXDCMakeTool"

-			/>

-			<Tool

-				Name="VCBscMakeTool"

-			/>

-			<Tool

-				Name="VCFxCopTool"

-			/>

-			<Tool

-				Name="VCAppVerifierTool"

-			/>

-			<Tool

-				Name="VCPostBuildEventTool"

-			/>

-		</Configuration>

-		<Configuration

-			Name="Release|Win32"

-			OutputDirectory="Release"

-			IntermediateDirectory="Release"

-			ConfigurationType="1"

-			InheritedPropertySheets="$(VCInstallDir)VCProjectDefaults\UpgradeFromVC71.vsprops"

-			CharacterSet="2"

-			>

-			<Tool

-				Name="VCPreBuildEventTool"

-			/>

-			<Tool

-				Name="VCCustomBuildTool"

-			/>

-			<Tool

-				Name="VCXMLDataGeneratorTool"

-			/>

-			<Tool

-				Name="VCWebServiceProxyGeneratorTool"

-			/>

-			<Tool

-				Name="VCMIDLTool"

-			/>

-			<Tool

-				Name="VCCLCompilerTool"

-				AdditionalOptions="/Ow"

-				InlineFunctionExpansion="0"

-				EnableIntrinsicFunctions="true"

-				FavorSizeOrSpeed="1"

-				OmitFramePointers="true"

-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE"

-				StringPooling="true"

-				RuntimeLibrary="2"

-				BufferSecurityCheck="false"

-				EnableEnhancedInstructionSet="1"

-				UsePrecompiledHeader="0"

-				WarningLevel="3"

-				Detect64BitPortabilityProblems="false"

-				DebugInformationFormat="3"

-			/>

-			<Tool

-				Name="VCManagedResourceCompilerTool"

-			/>

-			<Tool

-				Name="VCResourceCompilerTool"

-			/>

-			<Tool

-				Name="VCPreLinkEventTool"

-			/>

-			<Tool

-				Name="VCLinkerTool"

-				OutputFile="$(OutDir)/nedmalloc.exe"

-				LinkIncremental="1"

-				GenerateDebugInformation="true"

-				SubSystem="1"

-				OptimizeReferences="2"

-				EnableCOMDATFolding="2"

-				RandomizedBaseAddress="1"

-				DataExecutionPrevention="0"

-				TargetMachine="1"

-			/>

-			<Tool

-				Name="VCALinkTool"

-			/>

-			<Tool

-				Name="VCManifestTool"

-			/>

-			<Tool

-				Name="VCXDCMakeTool"

-			/>

-			<Tool

-				Name="VCBscMakeTool"

-			/>

-			<Tool

-				Name="VCFxCopTool"

-			/>

-			<Tool

-				Name="VCAppVerifierTool"

-			/>

-			<Tool

-				Name="VCPostBuildEventTool"

-			/>

-		</Configuration>

-	</Configurations>

-	<References>

-	</References>

-	<Files>

-		<Filter

-			Name="Source Files"

-			Filter="cpp;c;cxx;def;odl;idl;hpj;bat;asm;asmx"

-			UniqueIdentifier="{4FC737F1-C7A5-4376-A066-2A32D752A2FF}"

-			>

-			<File

-				RelativePath=".\nedmalloc.c"

-				>

-				<FileConfiguration

-					Name="Debug|Win32"

-					ExcludedFromBuild="true"

-					>

-					<Tool

-						Name="VCCLCompilerTool"

-					/>

-				</FileConfiguration>

-				<FileConfiguration

-					Name="Release|Win32"

-					ExcludedFromBuild="true"

-					>

-					<Tool

-						Name="VCCLCompilerTool"

-					/>

-				</FileConfiguration>

-			</File>

-			<File

-				RelativePath=".\test.c"

-				>

-			</File>

-		</Filter>

-		<Filter

-			Name="Header Files"

-			Filter="h;hpp;hxx;hm;inl;inc;xsd"

-			UniqueIdentifier="{93995380-89BD-4b04-88EB-625FBE52EBFB}"

-			>

-			<File

-				RelativePath=".\malloc.c.h"

-				>

-			</File>

-			<File

-				RelativePath=".\nedmalloc.h"

-				>

-			</File>

-		</Filter>

-		<Filter

-			Name="Resource Files"

-			Filter="rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx"

-			UniqueIdentifier="{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}"

-			>

-		</Filter>

-		<File

-			RelativePath="..\..\..\..\gcLink.cc"

-			>

-			<FileConfiguration

-				Name="Debug|Win32"

-				ExcludedFromBuild="true"

-				>

-				<Tool

-					Name="VCCLCompilerTool"

-				/>

-			</FileConfiguration>

-			<FileConfiguration

-				Name="Release|Win32"

-				ExcludedFromBuild="true"

-				>

-				<Tool

-					Name="VCCLCompilerTool"

-				/>

-			</FileConfiguration>

-		</File>

-		<File

-			RelativePath=".\Readme.txt"

-			>

-		</File>

-	</Files>

-	<Globals>

-	</Globals>

-</VisualStudioProject>

diff --git a/drivers/nedmalloc/test.c b/drivers/nedmalloc/test.c
deleted file mode 100644
index 8b9fed81d0..0000000000
--- a/drivers/nedmalloc/test.c
+++ /dev/null
@@ -1,356 +0,0 @@
-/* test.c

-An example of how to use nedalloc

-(C) 2005-2007 Niall Douglas

-*/

-

-#include <stdio.h>

-#include <stdlib.h>

-#include "nedmalloc.c"

-

-#define THREADS 5

-#define RECORDS (100000/THREADS)

-#define TORTURETEST 1

-

-static int whichmalloc;

-static int doRealloc;

-static struct threadstuff_t

-{

-	int ops;

-	unsigned int *toalloc;

-	void **allocs;

-	char cachesync1[128];

-	int done;

-	char cachesync2[128];

-} threadstuff[THREADS];

-

-static void threadcode(int);

-

-#ifdef WIN32

-static DWORD WINAPI _threadcode(LPVOID a)

-{

-	threadcode((int)(size_t) a);

-	return 0;

-}

-#define THREADVAR HANDLE

-#define THREADINIT(v, id) (*v=CreateThread(NULL, 0, _threadcode, (LPVOID)(size_t) id, 0, NULL))

-#define THREADSLEEP(v) SleepEx(v, FALSE)

-#define THREADWAIT(v) (WaitForSingleObject(v, INFINITE), 0)

-

-typedef unsigned __int64 usCount;

-static FORCEINLINE usCount GetUsCount()

-{

-	static LARGE_INTEGER ticksPerSec;

-	static double scalefactor;

-	LARGE_INTEGER val;

-	if(!scalefactor)

-	{

-		if(QueryPerformanceFrequency(&ticksPerSec))

-			scalefactor=ticksPerSec.QuadPart/1000000000000.0;

-		else

-			scalefactor=1;

-	}

-	if(!QueryPerformanceCounter(&val))

-		return (usCount) GetTickCount() * 1000000000;

-	return (usCount) (val.QuadPart/scalefactor);

-}

-

-static HANDLE win32heap;

-static void *win32malloc(size_t size)

-{

-	return HeapAlloc(win32heap, 0, size);

-}

-static void *win32realloc(void *p, size_t size)

-{

-	return HeapReAlloc(win32heap, 0, p, size);

-}

-static void win32free(void *mem)

-{

-	HeapFree(win32heap, 0, mem);

-}

-

-static void *(*const mallocs[])(size_t size)={ malloc, nedmalloc, win32malloc };

-static void *(*const reallocs[])(void *p, size_t size)={ realloc, nedrealloc, win32realloc };

-static void (*const frees[])(void *mem)={ free, nedfree, win32free };

-#else

-static void *_threadcode(void *a)

-{

-	threadcode((int)(size_t) a);

-	return 0;

-}

-#define THREADVAR pthread_t

-#define THREADINIT(v, id) pthread_create(v, NULL, _threadcode, (void *)(size_t) id)

-#define THREADSLEEP(v) usleep(v*1000)

-#define THREADWAIT(v) pthread_join(v, NULL)

-

-typedef unsigned long long usCount;

-static FORCEINLINE usCount GetUsCount()

-{

-	struct timeval tv;

-	gettimeofday(&tv, 0);

-	return ((usCount) tv.tv_sec*1000000000000LL)+tv.tv_usec*1000000LL;

-}

-

-static void *(*const mallocs[])(size_t size)={ malloc, nedmalloc };

-static void *(*const reallocs[])(void *p, size_t size)={ realloc, nedrealloc };

-static void (*const frees[])(void *mem)={ free, nedfree };

-#endif

-static usCount times[THREADS];

-

-

-static FORCEINLINE unsigned int myrandom(unsigned int *seed)

-{

-	*seed=1664525UL*(*seed)+1013904223UL;

-	return *seed;

-}

-

-static void threadcode(int threadidx)

-{

-	int n;

-	unsigned int *toallocptr=threadstuff[threadidx].toalloc;

-	void **allocptr=threadstuff[threadidx].allocs;

-	unsigned int seed=threadidx;

-	usCount start;

-	threadstuff[threadidx].done=0;

-	/*neddisablethreadcache(0);*/

-	THREADSLEEP(100);

-	start=GetUsCount();

-#ifdef TORTURETEST

-	/* A randomised malloc/realloc/free test (torture test) */

-	for(n=0; n<RECORDS*100; n++)

-	{

-		unsigned int r=myrandom(&seed), i;

-		i=(int)(r % RECORDS);

-		if(!allocptr[i])

-		{

-			allocptr[i]=mallocs[whichmalloc](r & 0x1FFF);

-			threadstuff[threadidx].ops++;

-		}

-		else if(r & (1<<31))

-		{

-			allocptr[i]=reallocs[whichmalloc](allocptr[i], r & 0x1FFF);

-			threadstuff[threadidx].ops++;

-		}

-		else

-		{

-			frees[whichmalloc](allocptr[i]);

-			allocptr[i]=0;

-		}

-	}

-	for(n=0; n<RECORDS; n++)

-	{

-		if(allocptr[n])

-		{

-			frees[whichmalloc](allocptr[n]);

-			allocptr[n]=0;

-		}

-	}

-#else

-	/* A simple stack which allocates and deallocates off the top (speed test) */

-	for(n=0; n<RECORDS;)

-	{

-#if 1

-		r=myrandom(&seed);

-		if(allocptr>threadstuff[threadidx].allocs && (r & 65535)<32760) /*<32760)*/

-		{	/* free */

-			--toallocptr;

-			--allocptr;

-			--n;

-			frees[whichmalloc](*allocptr);

-			*allocptr=0;

-		}

-		else

-#endif

-		{

-			if(doRealloc && allocptr>threadstuff[threadidx].allocs && (r & 1))

-			{

-	            allocptr[-1]=reallocs[whichmalloc](allocptr[-1], *toallocptr);

-			}

-			else

-			{

-	            allocptr[0]=mallocs[whichmalloc](*toallocptr);

-				allocptr++;

-			}

-			n++;

-			toallocptr++;

-			threadstuff[threadidx].ops++;

-		}

-	}

-	while(allocptr>threadstuff[threadidx].allocs)

-	{

-		frees[whichmalloc](*--allocptr);

-	}

-#endif

-	times[threadidx]+=GetUsCount()-start;

-	neddisablethreadcache(0);

-	threadstuff[threadidx].done=1;

-}

-

-static double runtest()

-{

-	unsigned int seed=1;

-	int n, i;

-	double opspersec=0;

-	THREADVAR threads[THREADS];

-	for(n=0; n<THREADS; n++)

-	{

-		unsigned int *toallocptr;

-		int m;

-		threadstuff[n].ops=0;

-		times[n]=0;

-		threadstuff[n].toalloc=toallocptr=calloc(RECORDS, sizeof(unsigned int));

-		threadstuff[n].allocs=calloc(RECORDS, sizeof(void *));

-		for(m=0; m<RECORDS; m++)

-		{

-			unsigned int size=myrandom(&seed);

-			if(size<(1<<30))

-			{   /* Make it two power multiple of less than 512 bytes to

-				model frequent C++ new's */

-				size=4<<(size & 7);

-			}

-			else

-			{

-				size&=0x3FFF;             /* < 16Kb */

-				/*size&=0x1FFF;*/			  /* < 8Kb */

-				/*size=(1<<6)<<(size & 7);*/  /* < 8Kb */

-			}

-			*toallocptr++=size;

-		}

-	}

-#ifdef TORTURETEST

-	for(n=0; n<THREADS; n++)

-	{

-		THREADINIT(&threads[n], n);

-	}

-	for(i=0; i<32; i++)

-	{

-		int found=-1;

-		do

-		{

-			for(n=0; n<THREADS; n++)

-			{

-				THREADSLEEP(100);

-				if(threadstuff[n].done)

-				{

-					found=n;

-					break;

-				}

-			}

-		} while(found<0);

-		THREADWAIT(threads[found]);

-		threads[found]=0;

-		THREADINIT(&threads[found], found);

-		printf("Relaunched thread %d\n", found);

-	}

-	for(n=THREADS-1; n>=0; n--)

-	{

-		THREADWAIT(threads[n]);

-		threads[n]=0;

-	}

-#else

-#if 1

-	for(n=0; n<THREADS; n++)

-	{

-		THREADINIT(&threads[n], n);

-	}

-	for(n=THREADS-1; n>=0; n--)

-	{

-		THREADWAIT(threads[n]);

-		threads[n]=0;

-	}

-#else

-	/* Quick realloc() test */

-	doRealloc=1;

-	for(n=0; n<THREADS; n++)

-	{

-		THREADINIT(&threads[n], n);

-	}

-	for(n=THREADS-1; n>=0; n--)

-	{

-		THREADWAIT(threads[n]);

-		threads[n]=0;

-	}

-#endif

-#endif

-	{

-		usCount totaltime=0;

-		int totalops=0;

-		for(n=0; n<THREADS; n++)

-		{

-			totaltime+=times[n];

-			totalops+=threadstuff[n].ops;

-		}

-		opspersec=1000000000000.0*totalops/totaltime*THREADS;

-		printf("This allocator achieves %lfops/sec under %d threads\n", opspersec, THREADS);

-	}

-	for(n=THREADS-1; n>=0; n--)

-	{

-		free(threadstuff[n].allocs); threadstuff[n].allocs=0;

-		free(threadstuff[n].toalloc); threadstuff[n].toalloc=0;

-	}

-	return opspersec;

-}

-

-int main(void)

-{

-	double std=0, ned=0;

-

-#if 0

-	{

-		usCount start, end;

-		start=GetUsCount();

-		THREADSLEEP(5000);

-		end=GetUsCount();

-		printf("Wait was %lf\n", (end-start)/1000000000000.0);

-	}

-#endif

-#ifdef WIN32

-	{	/* Force load of user32.dll so we can debug */

-		BOOL v;

-		SystemParametersInfo(SPI_GETBEEP, 0, &v, 0);

-	}

-#endif

-

-	if(0)

-	{

-		printf("\nTesting standard allocator with %d threads ...\n", THREADS);

-		std=runtest();

-	}

-	if(1)

-	{

-		printf("\nTesting nedmalloc with %d threads ...\n", THREADS);

-		whichmalloc=1;

-		ned=runtest();

-	}

-#ifdef WIN32

-	if(0)

-	{

-		ULONG data=2;

-		win32heap=HeapCreate(0, 0, 0);

-		HeapSetInformation(win32heap, HeapCompatibilityInformation, &data, sizeof(data));

-		HeapQueryInformation(win32heap, HeapCompatibilityInformation, &data, sizeof(data), NULL);

-		if(2!=data)

-		{

-			printf("The win32 low frag allocator won't work under a debugger!\n");

-		}

-		else

-		{

-			printf("Testing win32 low frag allocator with %d threads ...\n\n", THREADS);

-			whichmalloc=2;

-			runtest();

-		}

-		HeapDestroy(win32heap);

-	}

-#endif

-	if(std && ned)

-	{	// ned should have more ops/sec

-		printf("\n\nnedmalloc allocator is %lf times faster than standard\n", ned/std);

-	}

-	printf("\nPress a key to trim\n");

-	getchar();

-	nedmalloc_trim(0);

-#ifdef _MSC_VER

-	printf("\nPress a key to end\n");

-	getchar();

-#endif

-	return 0;

-}

diff --git a/drivers/png/SCsub b/drivers/png/SCsub
index 9dbffeed1f..96ef9fa5f8 100644
--- a/drivers/png/SCsub
+++ b/drivers/png/SCsub
@@ -3,7 +3,6 @@ Import('env_drivers')
 
 
 png_sources = [
-	"png/example.c",
 	"png/png.c",
 	"png/pngerror.c",
 	"png/pngget.c",
diff --git a/drivers/png/example.c b/drivers/png/example.c
deleted file mode 100644
index 7171d9847e..0000000000
--- a/drivers/png/example.c
+++ /dev/null
@@ -1,879 +0,0 @@
-
-#if 0 /* in case someone actually tries to compile this */
-
-/* example.c - an example of using libpng
- * Last changed in libpng 1.5.19 [August 21, 2014]
- * Maintained 1998-2014 Glenn Randers-Pehrson
- * Maintained 1996, 1997 Andreas Dilger
- * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- */
-
-/* This is an example of how to use libpng to read and write PNG files.
- * The file libpng-manual.txt is much more verbose then this.  If you have not
- * read it, do so first.  This was designed to be a starting point of an
- * implementation.  This is not officially part of libpng, is hereby placed
- * in the public domain, and therefore does not require a copyright notice.
- * To the extent possible under law, the authors have waived all copyright and
- * related or neighboring rights to this file.
- *
- * This file does not currently compile, because it is missing certain
- * parts, like allocating memory to hold an image.  You will have to
- * supply these parts to get it to compile.  For an example of a minimal
- * working PNG reader/writer, see pngtest.c, included in this distribution;
- * see also the programs in the contrib directory.
- */
-
-#define _POSIX_SOURCE 1  /* libpng and zlib are POSIX-compliant.  You may
-                          * change this if your application uses non-POSIX
-                          * extensions. */
-
-#include "png.h"
-
- /* The png_jmpbuf() macro, used in error handling, became available in
-  * libpng version 1.0.6.  If you want to be able to run your code with older
-  * versions of libpng, you must define the macro yourself (but only if it
-  * is not already defined by libpng!).
-  */
-
-#ifndef png_jmpbuf
-#  define png_jmpbuf(png_ptr) ((png_ptr)->png_jmpbuf)
-#endif
-
-/* Check to see if a file is a PNG file using png_sig_cmp().  png_sig_cmp()
- * returns zero if the image is a PNG and nonzero if it isn't a PNG.
- *
- * The function check_if_png() shown here, but not used, returns nonzero (true)
- * if the file can be opened and is a PNG, 0 (false) otherwise.
- *
- * If this call is successful, and you are going to keep the file open,
- * you should call png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK); once
- * you have created the png_ptr, so that libpng knows your application
- * has read that many bytes from the start of the file.  Make sure you
- * don't call png_set_sig_bytes() with more than 8 bytes read or give it
- * an incorrect number of bytes read, or you will either have read too
- * many bytes (your fault), or you are telling libpng to read the wrong
- * number of magic bytes (also your fault).
- *
- * Many applications already read the first 2 or 4 bytes from the start
- * of the image to determine the file type, so it would be easiest just
- * to pass the bytes to png_sig_cmp() or even skip that if you know
- * you have a PNG file, and call png_set_sig_bytes().
- */
-#define PNG_BYTES_TO_CHECK 4
-int check_if_png(char *file_name, FILE **fp)
-{
-   char buf[PNG_BYTES_TO_CHECK];
-
-   /* Open the prospective PNG file. */
-   if ((*fp = fopen(file_name, "rb")) == NULL)
-      return 0;
-
-   /* Read in some of the signature bytes */
-   if (fread(buf, 1, PNG_BYTES_TO_CHECK, *fp) != PNG_BYTES_TO_CHECK)
-      return 0;
-
-   /* Compare the first PNG_BYTES_TO_CHECK bytes of the signature.
-      Return nonzero (true) if they match */
-
-   return(!png_sig_cmp(buf, (png_size_t)0, PNG_BYTES_TO_CHECK));
-}
-
-/* Read a PNG file.  You may want to return an error code if the read
- * fails (depending upon the failure).  There are two "prototypes" given
- * here - one where we are given the filename, and we need to open the
- * file, and the other where we are given an open file (possibly with
- * some or all of the magic bytes read - see comments above).
- */
-#ifdef open_file /* prototype 1 */
-void read_png(char *file_name)  /* We need to open the file */
-{
-   png_structp png_ptr;
-   png_infop info_ptr;
-   int sig_read = 0;
-   png_uint_32 width, height;
-   int bit_depth, color_type, interlace_type;
-   FILE *fp;
-
-   if ((fp = fopen(file_name, "rb")) == NULL)
-      return (ERROR);
-
-#else no_open_file /* prototype 2 */
-void read_png(FILE *fp, int sig_read)  /* File is already open */
-{
-   png_structp png_ptr;
-   png_infop info_ptr;
-   png_uint_32 width, height;
-   int bit_depth, color_type, interlace_type;
-#endif no_open_file /* Only use one prototype! */
-
-   /* Create and initialize the png_struct with the desired error handler
-    * functions.  If you want to use the default stderr and longjump method,
-    * you can supply NULL for the last three parameters.  We also supply the
-    * the compiler header file version, so that we know if the application
-    * was compiled with a compatible version of the library.  REQUIRED
-    */
-   png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
-      png_voidp user_error_ptr, user_error_fn, user_warning_fn);
-
-   if (png_ptr == NULL)
-   {
-      fclose(fp);
-      return (ERROR);
-   }
-
-   /* Allocate/initialize the memory for image information.  REQUIRED. */
-   info_ptr = png_create_info_struct(png_ptr);
-   if (info_ptr == NULL)
-   {
-      fclose(fp);
-      png_destroy_read_struct(&png_ptr, NULL, NULL);
-      return (ERROR);
-   }
-
-   /* Set error handling if you are using the setjmp/longjmp method (this is
-    * the normal method of doing things with libpng).  REQUIRED unless you
-    * set up your own error handlers in the png_create_read_struct() earlier.
-    */
-
-   if (setjmp(png_jmpbuf(png_ptr)))
-   {
-      /* Free all of the memory associated with the png_ptr and info_ptr */
-      png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-      fclose(fp);
-      /* If we get here, we had a problem reading the file */
-      return (ERROR);
-   }
-
-   /* One of the following I/O initialization methods is REQUIRED */
-#ifdef streams /* PNG file I/O method 1 */
-   /* Set up the input control if you are using standard C streams */
-   png_init_io(png_ptr, fp);
-
-#else no_streams /* PNG file I/O method 2 */
-   /* If you are using replacement read functions, instead of calling
-    * png_init_io() here you would call:
-    */
-   png_set_read_fn(png_ptr, (void *)user_io_ptr, user_read_fn);
-   /* where user_io_ptr is a structure you want available to the callbacks */
-#endif no_streams /* Use only one I/O method! */
-
-   /* If we have already read some of the signature */
-   png_set_sig_bytes(png_ptr, sig_read);
-
-#ifdef hilevel
-   /*
-    * If you have enough memory to read in the entire image at once,
-    * and you need to specify only transforms that can be controlled
-    * with one of the PNG_TRANSFORM_* bits (this presently excludes
-    * quantizing, filling, setting background, and doing gamma
-    * adjustment), then you can read the entire image (including
-    * pixels) into the info structure with this call:
-    */
-   png_read_png(png_ptr, info_ptr, png_transforms, NULL);
-
-#else
-   /* OK, you're doing it the hard way, with the lower-level functions */
-
-   /* The call to png_read_info() gives us all of the information from the
-    * PNG file before the first IDAT (image data chunk).  REQUIRED
-    */
-   png_read_info(png_ptr, info_ptr);
-
-   png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
-       &interlace_type, NULL, NULL);
-
-   /* Set up the data transformations you want.  Note that these are all
-    * optional.  Only call them if you want/need them.  Many of the
-    * transformations only work on specific types of images, and many
-    * are mutually exclusive.
-    */
-
-   /* Tell libpng to strip 16 bits/color files down to 8 bits/color.
-    * Use accurate scaling if it's available, otherwise just chop off the
-    * low byte.
-    */
-#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
-    png_set_scale_16(png_ptr);
-#else
-   png_set_strip_16(png_ptr);
-#endif
-
-   /* Strip alpha bytes from the input data without combining with the
-    * background (not recommended).
-    */
-   png_set_strip_alpha(png_ptr);
-
-   /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
-    * byte into separate bytes (useful for paletted and grayscale images).
-    */
-   png_set_packing(png_ptr);
-
-   /* Change the order of packed pixels to least significant bit first
-    * (not useful if you are using png_set_packing). */
-   png_set_packswap(png_ptr);
-
-   /* Expand paletted colors into true RGB triplets */
-   if (color_type == PNG_COLOR_TYPE_PALETTE)
-      png_set_palette_to_rgb(png_ptr);
-
-   /* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
-   if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
-      png_set_expand_gray_1_2_4_to_8(png_ptr);
-
-   /* Expand paletted or RGB images with transparency to full alpha channels
-    * so the data will be available as RGBA quartets.
-    */
-   if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
-      png_set_tRNS_to_alpha(png_ptr);
-
-   /* Set the background color to draw transparent and alpha images over.
-    * It is possible to set the red, green, and blue components directly
-    * for paletted images instead of supplying a palette index.  Note that
-    * even if the PNG file supplies a background, you are not required to
-    * use it - you should use the (solid) application background if it has one.
-    */
-
-   png_color_16 my_background, *image_background;
-
-   if (png_get_bKGD(png_ptr, info_ptr, &image_background))
-      png_set_background(png_ptr, image_background,
-                         PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
-   else
-      png_set_background(png_ptr, &my_background,
-                         PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
-
-   /* Some suggestions as to how to get a screen gamma value
-    *
-    * Note that screen gamma is the display_exponent, which includes
-    * the CRT_exponent and any correction for viewing conditions
-    */
-   if (/* We have a user-defined screen gamma value */)
-   {
-      screen_gamma = user-defined screen_gamma;
-   }
-   /* This is one way that applications share the same screen gamma value */
-   else if ((gamma_str = getenv("SCREEN_GAMMA")) != NULL)
-   {
-      screen_gamma = atof(gamma_str);
-   }
-   /* If we don't have another value */
-   else
-   {
-      screen_gamma = PNG_DEFAULT_sRGB;  /* A good guess for a PC monitor
-                                           in a dimly lit room */
-      screen_gamma = PNG_GAMMA_MAC_18 or 1.0; /* Good guesses for Mac systems */
-   }
-
-   /* Tell libpng to handle the gamma conversion for you.  The final call
-    * is a good guess for PC generated images, but it should be configurable
-    * by the user at run time by the user.  It is strongly suggested that
-    * your application support gamma correction.
-    */
-
-   int intent;
-
-   if (png_get_sRGB(png_ptr, info_ptr, &intent))
-      png_set_gamma(png_ptr, screen_gamma, PNG_DEFAULT_sRGB);
-   else
-   {
-      double image_gamma;
-      if (png_get_gAMA(png_ptr, info_ptr, &image_gamma))
-         png_set_gamma(png_ptr, screen_gamma, image_gamma);
-      else
-         png_set_gamma(png_ptr, screen_gamma, 0.45455);
-   }
-
-#ifdef PNG_READ_QUANTIZE_SUPPORTED
-   /* Quantize RGB files down to 8-bit palette or reduce palettes
-    * to the number of colors available on your screen.
-    */
-   if (color_type & PNG_COLOR_MASK_COLOR)
-   {
-      int num_palette;
-      png_colorp palette;
-
-      /* This reduces the image to the application supplied palette */
-      if (/* We have our own palette */)
-      {
-         /* An array of colors to which the image should be quantized */
-         png_color std_color_cube[MAX_SCREEN_COLORS];
-
-         png_set_quantize(png_ptr, std_color_cube, MAX_SCREEN_COLORS,
-            MAX_SCREEN_COLORS, NULL, 0);
-      }
-      /* This reduces the image to the palette supplied in the file */
-      else if (png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette))
-      {
-         png_uint_16p histogram = NULL;
-
-         png_get_hIST(png_ptr, info_ptr, &histogram);
-
-         png_set_quantize(png_ptr, palette, num_palette,
-                        max_screen_colors, histogram, 0);
-      }
-   }
-#endif /* PNG_READ_QUANTIZE_SUPPORTED */
-
-   /* Invert monochrome files to have 0 as white and 1 as black */
-   png_set_invert_mono(png_ptr);
-
-   /* If you want to shift the pixel values from the range [0,255] or
-    * [0,65535] to the original [0,7] or [0,31], or whatever range the
-    * colors were originally in:
-    */
-   if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
-   {
-      png_color_8p sig_bit_p;
-
-      png_get_sBIT(png_ptr, info_ptr, &sig_bit_p);
-      png_set_shift(png_ptr, sig_bit_p);
-   }
-
-   /* Flip the RGB pixels to BGR (or RGBA to BGRA) */
-   if (color_type & PNG_COLOR_MASK_COLOR)
-      png_set_bgr(png_ptr);
-
-   /* Swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
-   png_set_swap_alpha(png_ptr);
-
-   /* Swap bytes of 16-bit files to least significant byte first */
-   png_set_swap(png_ptr);
-
-   /* Add filler (or alpha) byte (before/after each RGB triplet) */
-   png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-   /* Turn on interlace handling.  REQUIRED if you are not using
-    * png_read_image().  To see how to handle interlacing passes,
-    * see the png_read_row() method below:
-    */
-   number_passes = png_set_interlace_handling(png_ptr);
-#else
-   number_passes = 1;
-#endif /* PNG_READ_INTERLACING_SUPPORTED */
-
-
-   /* Optional call to gamma correct and add the background to the palette
-    * and update info structure.  REQUIRED if you are expecting libpng to
-    * update the palette for you (ie you selected such a transform above).
-    */
-   png_read_update_info(png_ptr, info_ptr);
-
-   /* Allocate the memory to hold the image using the fields of info_ptr. */
-
-   /* The easiest way to read the image: */
-   png_bytep row_pointers[height];
-
-   /* Clear the pointer array */
-   for (row = 0; row < height; row++)
-      row_pointers[row] = NULL;
-
-   for (row = 0; row < height; row++)
-      row_pointers[row] = png_malloc(png_ptr, png_get_rowbytes(png_ptr,
-         info_ptr));
-
-   /* Now it's time to read the image.  One of these methods is REQUIRED */
-#ifdef entire /* Read the entire image in one go */
-   png_read_image(png_ptr, row_pointers);
-
-#else no_entire /* Read the image one or more scanlines at a time */
-   /* The other way to read images - deal with interlacing: */
-
-   for (pass = 0; pass < number_passes; pass++)
-   {
-#ifdef single /* Read the image a single row at a time */
-      for (y = 0; y < height; y++)
-      {
-         png_read_rows(png_ptr, &row_pointers[y], NULL, 1);
-      }
-
-#else no_single /* Read the image several rows at a time */
-      for (y = 0; y < height; y += number_of_rows)
-      {
-#ifdef sparkle /* Read the image using the "sparkle" effect. */
-         png_read_rows(png_ptr, &row_pointers[y], NULL,
-            number_of_rows);
-#else no_sparkle /* Read the image using the "rectangle" effect */
-         png_read_rows(png_ptr, NULL, &row_pointers[y],
-            number_of_rows);
-#endif no_sparkle /* Use only one of these two methods */
-      }
-
-      /* If you want to display the image after every pass, do so here */
-#endif no_single /* Use only one of these two methods */
-   }
-#endif no_entire /* Use only one of these two methods */
-
-   /* Read rest of file, and get additional chunks in info_ptr - REQUIRED */
-   png_read_end(png_ptr, info_ptr);
-#endif hilevel
-
-   /* At this point you have read the entire image */
-
-   /* Clean up after the read, and free any memory allocated - REQUIRED */
-   png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
-
-   /* Close the file */
-   fclose(fp);
-
-   /* That's it */
-   return (OK);
-}
-
-/* Progressively read a file */
-
-int
-initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
-{
-   /* Create and initialize the png_struct with the desired error handler
-    * functions.  If you want to use the default stderr and longjump method,
-    * you can supply NULL for the last three parameters.  We also check that
-    * the library version is compatible in case we are using dynamically
-    * linked libraries.
-    */
-   *png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
-       png_voidp user_error_ptr, user_error_fn, user_warning_fn);
-
-   if (*png_ptr == NULL)
-   {
-      *info_ptr = NULL;
-      return (ERROR);
-   }
-
-   *info_ptr = png_create_info_struct(png_ptr);
-
-   if (*info_ptr == NULL)
-   {
-      png_destroy_read_struct(png_ptr, info_ptr, NULL);
-      return (ERROR);
-   }
-
-   if (setjmp(png_jmpbuf((*png_ptr))))
-   {
-      png_destroy_read_struct(png_ptr, info_ptr, NULL);
-      return (ERROR);
-   }
-
-   /* This one's new.  You will need to provide all three
-    * function callbacks, even if you aren't using them all.
-    * If you aren't using all functions, you can specify NULL
-    * parameters.  Even when all three functions are NULL,
-    * you need to call png_set_progressive_read_fn().
-    * These functions shouldn't be dependent on global or
-    * static variables if you are decoding several images
-    * simultaneously.  You should store stream specific data
-    * in a separate struct, given as the second parameter,
-    * and retrieve the pointer from inside the callbacks using
-    * the function png_get_progressive_ptr(png_ptr).
-    */
-   png_set_progressive_read_fn(*png_ptr, (void *)stream_data,
-      info_callback, row_callback, end_callback);
-
-   return (OK);
-}
-
-int
-process_data(png_structp *png_ptr, png_infop *info_ptr,
-   png_bytep buffer, png_uint_32 length)
-{
-   if (setjmp(png_jmpbuf((*png_ptr))))
-   {
-      /* Free the png_ptr and info_ptr memory on error */
-      png_destroy_read_struct(png_ptr, info_ptr, NULL);
-      return (ERROR);
-   }
-
-   /* This one's new also.  Simply give it chunks of data as
-    * they arrive from the data stream (in order, of course).
-    * On segmented machines, don't give it any more than 64K.
-    * The library seems to run fine with sizes of 4K, although
-    * you can give it much less if necessary (I assume you can
-    * give it chunks of 1 byte, but I haven't tried with less
-    * than 256 bytes yet).  When this function returns, you may
-    * want to display any rows that were generated in the row
-    * callback, if you aren't already displaying them there.
-    */
-   png_process_data(*png_ptr, *info_ptr, buffer, length);
-   return (OK);
-}
-
-info_callback(png_structp png_ptr, png_infop info)
-{
-   /* Do any setup here, including setting any of the transformations
-    * mentioned in the Reading PNG files section.  For now, you _must_
-    * call either png_start_read_image() or png_read_update_info()
-    * after all the transformations are set (even if you don't set
-    * any).  You may start getting rows before png_process_data()
-    * returns, so this is your last chance to prepare for that.
-    */
-}
-
-row_callback(png_structp png_ptr, png_bytep new_row,
-   png_uint_32 row_num, int pass)
-{
-   /*
-    * This function is called for every row in the image.  If the
-    * image is interlaced, and you turned on the interlace handler,
-    * this function will be called for every row in every pass.
-    *
-    * In this function you will receive a pointer to new row data from
-    * libpng called new_row that is to replace a corresponding row (of
-    * the same data format) in a buffer allocated by your application.
-    *
-    * The new row data pointer "new_row" may be NULL, indicating there is
-    * no new data to be replaced (in cases of interlace loading).
-    *
-    * If new_row is not NULL then you need to call
-    * png_progressive_combine_row() to replace the corresponding row as
-    * shown below:
-    */
-
-   /* Get pointer to corresponding row in our
-    * PNG read buffer.
-    */
-   png_bytep old_row = ((png_bytep *)our_data)[row_num];
-
-#ifdef PNG_READ_INTERLACING_SUPPORTED
-   /* If both rows are allocated then copy the new row
-    * data to the corresponding row data.
-    */
-   if ((old_row != NULL) && (new_row != NULL))
-   png_progressive_combine_row(png_ptr, old_row, new_row);
-
-   /*
-    * The rows and passes are called in order, so you don't really
-    * need the row_num and pass, but I'm supplying them because it
-    * may make your life easier.
-    *
-    * For the non-NULL rows of interlaced images, you must call
-    * png_progressive_combine_row() passing in the new row and the
-    * old row, as demonstrated above.  You can call this function for
-    * NULL rows (it will just return) and for non-interlaced images
-    * (it just does the png_memcpy for you) if it will make the code
-    * easier.  Thus, you can just do this for all cases:
-    */
-
-   png_progressive_combine_row(png_ptr, old_row, new_row);
-
-   /* where old_row is what was displayed for previous rows.  Note
-    * that the first pass (pass == 0 really) will completely cover
-    * the old row, so the rows do not have to be initialized.  After
-    * the first pass (and only for interlaced images), you will have
-    * to pass the current row as new_row, and the function will combine
-    * the old row and the new row.
-    */
-#endif /* PNG_READ_INTERLACING_SUPPORTED */
-}
-
-end_callback(png_structp png_ptr, png_infop info)
-{
-   /* This function is called when the whole image has been read,
-    * including any chunks after the image (up to and including
-    * the IEND).  You will usually have the same info chunk as you
-    * had in the header, although some data may have been added
-    * to the comments and time fields.
-    *
-    * Most people won't do much here, perhaps setting a flag that
-    * marks the image as finished.
-    */
-}
-
-/* Write a png file */
-void write_png(char *file_name /* , ... other image information ... */)
-{
-   FILE *fp;
-   png_structp png_ptr;
-   png_infop info_ptr;
-   png_colorp palette;
-
-   /* Open the file */
-   fp = fopen(file_name, "wb");
-   if (fp == NULL)
-      return (ERROR);
-
-   /* Create and initialize the png_struct with the desired error handler
-    * functions.  If you want to use the default stderr and longjump method,
-    * you can supply NULL for the last three parameters.  We also check that
-    * the library version is compatible with the one used at compile time,
-    * in case we are using dynamically linked libraries.  REQUIRED.
-    */
-   png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
-      png_voidp user_error_ptr, user_error_fn, user_warning_fn);
-
-   if (png_ptr == NULL)
-   {
-      fclose(fp);
-      return (ERROR);
-   }
-
-   /* Allocate/initialize the image information data.  REQUIRED */
-   info_ptr = png_create_info_struct(png_ptr);
-   if (info_ptr == NULL)
-   {
-      fclose(fp);
-      png_destroy_write_struct(&png_ptr,  NULL);
-      return (ERROR);
-   }
-
-   /* Set error handling.  REQUIRED if you aren't supplying your own
-    * error handling functions in the png_create_write_struct() call.
-    */
-   if (setjmp(png_jmpbuf(png_ptr)))
-   {
-      /* If we get here, we had a problem writing the file */
-      fclose(fp);
-      png_destroy_write_struct(&png_ptr, &info_ptr);
-      return (ERROR);
-   }
-
-   /* One of the following I/O initialization functions is REQUIRED */
-
-#ifdef streams /* I/O initialization method 1 */
-   /* Set up the output control if you are using standard C streams */
-   png_init_io(png_ptr, fp);
-
-#else no_streams /* I/O initialization method 2 */
-   /* If you are using replacement write functions, instead of calling
-    * png_init_io() here you would call
-    */
-   png_set_write_fn(png_ptr, (void *)user_io_ptr, user_write_fn,
-      user_IO_flush_function);
-   /* where user_io_ptr is a structure you want available to the callbacks */
-#endif no_streams /* Only use one initialization method */
-
-#ifdef hilevel
-   /* This is the easy way.  Use it if you already have all the
-    * image info living in the structure.  You could "|" many
-    * PNG_TRANSFORM flags into the png_transforms integer here.
-    */
-   png_write_png(png_ptr, info_ptr, png_transforms, NULL);
-
-#else
-   /* This is the hard way */
-
-   /* Set the image information here.  Width and height are up to 2^31,
-    * bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
-    * the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
-    * PNG_COLOR_TYPE_GRAY_ALPHA, PNG_COLOR_TYPE_PALETTE, PNG_COLOR_TYPE_RGB,
-    * or PNG_COLOR_TYPE_RGB_ALPHA.  interlace is either PNG_INTERLACE_NONE or
-    * PNG_INTERLACE_ADAM7, and the compression_type and filter_type MUST
-    * currently be PNG_COMPRESSION_TYPE_BASE and PNG_FILTER_TYPE_BASE. REQUIRED
-    */
-   png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth, PNG_COLOR_TYPE_???,
-      PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
-
-   /* Set the palette if there is one.  REQUIRED for indexed-color images */
-   palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH
-             * png_sizeof(png_color));
-   /* ... Set palette colors ... */
-   png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
-   /* You must not free palette here, because png_set_PLTE only makes a link to
-    * the palette that you malloced.  Wait until you are about to destroy
-    * the png structure.
-    */
-
-   /* Optional significant bit (sBIT) chunk */
-   png_color_8 sig_bit;
-
-   /* If we are dealing with a grayscale image then */
-   sig_bit.gray = true_bit_depth;
-
-   /* Otherwise, if we are dealing with a color image then */
-   sig_bit.red = true_red_bit_depth;
-   sig_bit.green = true_green_bit_depth;
-   sig_bit.blue = true_blue_bit_depth;
-
-   /* If the image has an alpha channel then */
-   sig_bit.alpha = true_alpha_bit_depth;
-
-   png_set_sBIT(png_ptr, info_ptr, &sig_bit);
-
-
-   /* Optional gamma chunk is strongly suggested if you have any guess
-    * as to the correct gamma of the image.
-    */
-   png_set_gAMA(png_ptr, info_ptr, gamma);
-
-   /* Optionally write comments into the image */
-   {
-      png_text text_ptr[3];
-
-      char key0[]="Title";
-      char text0[]="Mona Lisa";
-      text_ptr[0].key = key0;
-      text_ptr[0].text = text0;
-      text_ptr[0].compression = PNG_TEXT_COMPRESSION_NONE;
-      text_ptr[0].itxt_length = 0;
-      text_ptr[0].lang = NULL;
-      text_ptr[0].lang_key = NULL;
-
-      char key1[]="Author";
-      char text1[]="Leonardo DaVinci";
-      text_ptr[1].key = key1;
-      text_ptr[1].text = text1;
-      text_ptr[1].compression = PNG_TEXT_COMPRESSION_NONE;
-      text_ptr[1].itxt_length = 0;
-      text_ptr[1].lang = NULL;
-      text_ptr[1].lang_key = NULL;
-
-      char key2[]="Description";
-      char text2[]="<long text>";
-      text_ptr[2].key = key2;
-      text_ptr[2].text = text2;
-      text_ptr[2].compression = PNG_TEXT_COMPRESSION_zTXt;
-      text_ptr[2].itxt_length = 0;
-      text_ptr[2].lang = NULL;
-      text_ptr[2].lang_key = NULL;
-
-      png_set_text(write_ptr, write_info_ptr, text_ptr, 3);
-   }
-
-   /* Other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs */
-
-   /* Note that if sRGB is present the gAMA and cHRM chunks must be ignored
-    * on read and, if your application chooses to write them, they must
-    * be written in accordance with the sRGB profile
-    */
-
-   /* Write the file header information.  REQUIRED */
-   png_write_info(png_ptr, info_ptr);
-
-   /* If you want, you can write the info in two steps, in case you need to
-    * write your private chunk ahead of PLTE:
-    *
-    *   png_write_info_before_PLTE(write_ptr, write_info_ptr);
-    *   write_my_chunk();
-    *   png_write_info(png_ptr, info_ptr);
-    *
-    * However, given the level of known- and unknown-chunk support in 1.2.0
-    * and up, this should no longer be necessary.
-    */
-
-   /* Once we write out the header, the compression type on the text
-    * chunk gets changed to PNG_TEXT_COMPRESSION_NONE_WR or
-    * PNG_TEXT_COMPRESSION_zTXt_WR, so it doesn't get written out again
-    * at the end.
-    */
-
-   /* Set up the transformations you want.  Note that these are
-    * all optional.  Only call them if you want them.
-    */
-
-   /* Invert monochrome pixels */
-   png_set_invert_mono(png_ptr);
-
-   /* Shift the pixels up to a legal bit depth and fill in
-    * as appropriate to correctly scale the image.
-    */
-   png_set_shift(png_ptr, &sig_bit);
-
-   /* Pack pixels into bytes */
-   png_set_packing(png_ptr);
-
-   /* Swap location of alpha bytes from ARGB to RGBA */
-   png_set_swap_alpha(png_ptr);
-
-   /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
-    * RGB (4 channels -> 3 channels). The second parameter is not used.
-    */
-   png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
-
-   /* Flip BGR pixels to RGB */
-   png_set_bgr(png_ptr);
-
-   /* Swap bytes of 16-bit files to most significant byte first */
-   png_set_swap(png_ptr);
-
-   /* Swap bits of 1-bit, 2-bit, 4-bit packed pixel formats */
-   png_set_packswap(png_ptr);
-
-   /* Turn on interlace handling if you are not using png_write_image() */
-   if (interlacing != 0)
-      number_passes = png_set_interlace_handling(png_ptr);
-
-   else
-      number_passes = 1;
-
-   /* The easiest way to write the image (you may have a different memory
-    * layout, however, so choose what fits your needs best).  You need to
-    * use the first method if you aren't handling interlacing yourself.
-    */
-   png_uint_32 k, height, width;
-
-   /* In this example, "image" is a one-dimensional array of bytes */
-   png_byte image[height*width*bytes_per_pixel];
-
-   png_bytep row_pointers[height];
-
-   if (height > PNG_UINT_32_MAX/png_sizeof(png_bytep))
-     png_error (png_ptr, "Image is too tall to process in memory");
-
-   /* Set up pointers into your "image" byte array */
-   for (k = 0; k < height; k++)
-     row_pointers[k] = image + k*width*bytes_per_pixel;
-
-   /* One of the following output methods is REQUIRED */
-
-#ifdef entire /* Write out the entire image data in one call */
-   png_write_image(png_ptr, row_pointers);
-
-   /* The other way to write the image - deal with interlacing */
-
-#else no_entire /* Write out the image data by one or more scanlines */
-
-   /* The number of passes is either 1 for non-interlaced images,
-    * or 7 for interlaced images.
-    */
-   for (pass = 0; pass < number_passes; pass++)
-   {
-      /* Write a few rows at a time. */
-      png_write_rows(png_ptr, &row_pointers[first_row], number_of_rows);
-
-      /* If you are only writing one row at a time, this works */
-      for (y = 0; y < height; y++)
-         png_write_rows(png_ptr, &row_pointers[y], 1);
-   }
-#endif no_entire /* Use only one output method */
-
-   /* You can write optional chunks like tEXt, zTXt, and tIME at the end
-    * as well.  Shouldn't be necessary in 1.2.0 and up as all the public
-    * chunks are supported and you can use png_set_unknown_chunks() to
-    * register unknown chunks into the info structure to be written out.
-    */
-
-   /* It is REQUIRED to call this to finish writing the rest of the file */
-   png_write_end(png_ptr, info_ptr);
-#endif hilevel
-
-   /* If you png_malloced a palette, free it here (don't free info_ptr->palette,
-    * as recommended in versions 1.0.5m and earlier of this example; if
-    * libpng mallocs info_ptr->palette, libpng will free it).  If you
-    * allocated it with malloc() instead of png_malloc(), use free() instead
-    * of png_free().
-    */
-   png_free(png_ptr, palette);
-   palette = NULL;
-
-   /* Similarly, if you png_malloced any data that you passed in with
-    * png_set_something(), such as a hist or trans array, free it here,
-    * when you can be sure that libpng is through with it.
-    */
-   png_free(png_ptr, trans);
-   trans = NULL;
-   /* Whenever you use png_free() it is a good idea to set the pointer to
-    * NULL in case your application inadvertently tries to png_free() it
-    * again.  When png_free() sees a NULL it returns without action, thus
-    * avoiding the double-free security problem.
-    */
-
-   /* Clean up after the write, and free any memory allocated */
-   png_destroy_write_struct(&png_ptr, &info_ptr);
-
-   /* Close the file */
-   fclose(fp);
-
-   /* That's it */
-   return (OK);
-}
-
-#endif /* if 0 */