tif_xfile.cpp

一个国人自己实现图像库的程序（有参考价值）

/*
 * TIFF C Library by Troels K. modified by crazybit
 * TIFF file IO, using straight C Runtime Library file functions.
 */
#include <windows.h>
#include <stdio.h>
#include "tiffiop.h"

static tsize_t 
_tiffReadProc(thandle_t fd, tdata_t buf, tsize_t size)
{
	DWORD	* pdata = (DWORD *)fd ;
	if (pdata[3] == 0) // write
		return 0 ;
	CopyMemory (buf, (void *)pdata[2], size) ;
	pdata[2] += size ;
	return size ;
}

static tsize_t
_tiffWriteProc(thandle_t fd, tdata_t buf, tsize_t size)
{
	DWORD	* pdata = (DWORD *)fd ;
	if (pdata[3] == 1) // read
		return 0 ;
	CopyMemory ((void *)pdata[2], buf, size) ;
	pdata[2] += size ;
	return size ;
}

static toff_t
_tiffSeekProc(thandle_t fd, toff_t off, int whence)
{
	DWORD	* pdata = (DWORD *)fd ;
	fpos_t pos = 0 ;
	if (pdata[3] == 1)
	{
		switch(whence)
		{
			case SEEK_SET: // Beginning
				pdata[2] = pdata[1] + off ;
				break;
			case SEEK_CUR: // Current position
				pdata[2] += off ;
				break;
			case SEEK_END: //End
				pdata[2] = pdata[1] + pdata[0] + off ;
				break;
		}
	}
	else // write
	{
		DWORD	nNewPos ;
		switch(whence)
		{
			case SEEK_SET: // Beginning
				nNewPos = pdata[1] + off ;
				break;
			case SEEK_CUR:
			case SEEK_END: //End
				nNewPos = pdata[2] + off ;
		}
		if (nNewPos < pdata[2])
			pdata[0] = pdata[2] ;
		pdata[2] = nNewPos ;
	}
	return (toff_t)(pdata[2] - pdata[1]);
}

static int
_tiffCloseProc(thandle_t fd)
{
	DWORD	* pdata = (DWORD *)fd ;
	if (pdata[3] == 0) // write
		if (pdata[0] == 0)
			pdata[0] = pdata[2] - pdata[1] ;
		else
			pdata[0] = pdata[0] - pdata[1] ;
	return 1 ;
}

#include <sys/stat.h>

static toff_t
_tiffSizeProc(thandle_t fd)
{
	DWORD	* pdata = (DWORD *)fd ;
	if (pdata[3] == 0)
		return 0 ;
	return (toff_t)pdata[0] ;
}

static int
_tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize)
{
	return (0);
}

static void
_tiffUnmapProc(thandle_t fd, tdata_t base, toff_t size)
{
}

// Open a TIFF file descriptor for read/writing.

TIFF*
TIFFFdOpen(int fd, const char* name, const char* mode)
{
	TIFF* tif;

	tif = TIFFClientOpen(name, mode,
	    (thandle_t) fd,
	    _tiffReadProc, _tiffWriteProc, _tiffSeekProc, _tiffCloseProc,
	    _tiffSizeProc, _tiffMapProc, _tiffUnmapProc);
	if (tif)
		tif->tif_fd = fd;
	return (tif);
}

/*
 * Open a TIFF file for read/writing.
 */

TIFF*
TIFFOpen(const char* name, const char* mode)
{
	static const char module[] = "TIFFOpen";
   FILE* stream = fopen(name, mode);
	if (stream == NULL) 
   {
		TIFFError(module, "%s: Cannot open", name);
		return NULL;
	}
	return (TIFFFdOpen((int)stream, name, mode));
}


#ifdef __GNUC__
extern	char* malloc();
extern	char* realloc();
#else
#include <malloc.h>
#endif

tdata_t
_TIFFmalloc(tsize_t s)
{
	return (malloc((size_t) s));
}

void
_TIFFfree(tdata_t p)
{
	free(p);
}

tdata_t
_TIFFrealloc(tdata_t p, tsize_t s)
{
	return (realloc(p, (size_t) s));
}

void
_TIFFmemset(tdata_t p, int v, tsize_t c)
{
	memset(p, v, (size_t) c);
}

void
_TIFFmemcpy(tdata_t d, const tdata_t s, tsize_t c)
{
	memcpy(d, s, (size_t) c);
}

int
_TIFFmemcmp(const tdata_t p1, const tdata_t p2, tsize_t c)
{
	return (memcmp(p1, p2, (size_t) c));
}

static void
Win32WarningHandler(const char* module, const char* fmt, va_list ap)
{
#ifdef _DEBUG
#ifndef TIF_PLATFORM_CONSOLE
	LPTSTR szTitle;
	LPTSTR szTmp;
	LPCTSTR szTitleText = "%s Warning";
	LPCTSTR szDefaultModule = "TIFFLIB";
	szTmp = (module == NULL) ? (LPTSTR)szDefaultModule : (LPTSTR)module;
	if ((szTitle = (LPTSTR)LocalAlloc(LMEM_FIXED, (lstrlen(szTmp) +
			lstrlen(szTitleText) + lstrlen(fmt) + 128)*sizeof(TCHAR))) == NULL)
		return;
	wsprintf(szTitle, szTitleText, szTmp);
	szTmp = szTitle + (lstrlen(szTitle)+2)*sizeof(TCHAR);
	wvsprintf(szTmp, fmt, ap);
	MessageBox(GetFocus(), szTmp, szTitle, MB_OK | MB_ICONINFORMATION);
	LocalFree(szTitle);
	return;
#else
	if (module != NULL)
		fprintf(stderr, "%s: ", module);
	fprintf(stderr, "Warning, ");
	vfprintf(stderr, fmt, ap);
	fprintf(stderr, ".\n");
#endif
#endif
}
TIFFErrorHandler _TIFFwarningHandler = Win32WarningHandler;

static void
Win32ErrorHandler(const char* module, const char* fmt, va_list ap)
{
#ifndef TIF_PLATFORM_CONSOLE
	LPTSTR szTitle;
	LPTSTR szTmp;
	LPCTSTR szTitleText = "%s Error";
	LPCTSTR szDefaultModule = "TIFFLIB";
	szTmp = (module == NULL) ? (LPTSTR)szDefaultModule : (LPTSTR)module;
	if ((szTitle = (LPTSTR)LocalAlloc(LMEM_FIXED, (lstrlen(szTmp) +
			lstrlen(szTitleText) + lstrlen(fmt) + 128)*sizeof(TCHAR))) == NULL)
		return;
	wsprintf(szTitle, szTitleText, szTmp);
	szTmp = szTitle + (lstrlen(szTitle)+2)*sizeof(TCHAR);
	wvsprintf(szTmp, fmt, ap);
	MessageBox(GetFocus(), szTmp, szTitle, MB_OK | MB_ICONEXCLAMATION);
	LocalFree(szTitle);
	return;
#else
	if (module != NULL)
		fprintf(stderr, "%s: ", module);
	vfprintf(stderr, fmt, ap);
	fprintf(stderr, ".\n");
#endif        
}
TIFFErrorHandler _TIFFerrorHandler = Win32ErrorHandler;