/* $Header: /usr/people/sam/tiff/libtiff/RCS/tif_win32.c,v 1.3 1996/01/10 19:33:18 sam Rel $ */

/*
 * Copyright (c) 1988-1996 Sam Leffler
 * Copyright (c) 1991-1996 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

/*
 * TIFF Library Win32-specific Routines.  Adapted from tif_unix.c 4/5/95 by
 * Scott Wagner (wagner@itek.com), Itek Graphix, Rochester, NY USA
 */
#include <windows.h>
#include "tiffiop.h"

static tsize_t
_tiffReadProc(thandle_t fd, tdata_t buf, tsize_t size)
{
    DWORD dwSizeRead;
    if (!ReadFile(fd, buf, size, &dwSizeRead, NULL))
        return(0);
    return ((tsize_t) dwSizeRead);
}

static tsize_t
_tiffWriteProc(thandle_t fd, tdata_t buf, tsize_t size)
{
    DWORD dwSizeWritten;
    if (!WriteFile(fd, buf, size, &dwSizeWritten, NULL))
        return(0);
    return ((tsize_t) dwSizeWritten);
}

static toff_t
_tiffSeekProc(thandle_t fd, toff_t off, int whence)
{
    DWORD dwMoveMethod;
    switch(whence)
    {
    case 0:
        dwMoveMethod = FILE_BEGIN;
        break;
    case 1:
        dwMoveMethod = FILE_CURRENT;
        break;
    case 2:
        dwMoveMethod = FILE_END;
        break;
    default:
        dwMoveMethod = FILE_BEGIN;
        break;
    }
    return ((toff_t)SetFilePointer(fd, off, NULL, dwMoveMethod));
}

static int
_tiffCloseProc(thandle_t fd)
{
    return (CloseHandle(fd) ? 0 : -1);
}

static toff_t
_tiffSizeProc(thandle_t fd)
{
    return ((toff_t)GetFileSize(fd, NULL));
}

/*
 * Because Windows uses both a handle and a pointer for file mapping, and only
 * the pointer is returned, the handle must be saved for later use (by the
 * unmap function).  To do this, the tiff structure has an extra member,
 * pv_map_handle, which is contiguous with (4 bytes or one 32-bit word above)
 * the tif_base parameter which is passed as *pbase to the map function.
 * pv_map_handle is then accessed indirectly (and perhaps somewhat unsafely)
 * as an offset from the *pbase parameter by _tiffMapProc.  The handle thus
 * created and saved is destroyed by _tiffUnmapProc, which does not need size
 * in Win32 but receives the map handle value in the size parameter instead.
 */

#pragma argsused
static int
_tiffDummyMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize)
{
    return(0);
}

static int
_tiffMapProc(thandle_t fd, tdata_t* pbase, toff_t* psize)
{
    toff_t size;
    HANDLE *phMapFile;
    if ((size = _tiffSizeProc(fd)) == (toff_t)-1)
        return(0);
    phMapFile = (HANDLE *)(((BYTE *)pbase) + 4);
    if ((*phMapFile = CreateFileMapping(fd, NULL, PAGE_READONLY, 0, size, NULL))
            == NULL)
        return(0);
    if ((*pbase = MapViewOfFile(*phMapFile, FILE_MAP_READ, 0, 0, 0)) ==
            NULL)
    {
        CloseHandle(*phMapFile);
        *phMapFile = NULL;
        return(0);
    }
    *psize = size;
    return(1);
}

#pragma argsused
static void
_tiffDummyUnmapProc(thandle_t fd, tdata_t base, toff_t size)
{
    return;
}

static void
_tiffUnmapProc(thandle_t fd, tdata_t base, toff_t map_handle)
{
    UnmapViewOfFile(base);
    CloseHandle((HANDLE)map_handle);
    return;
}

/*
 * Open a TIFF file descriptor for read/writing.
 * Note that TIFFFdOpen and TIFFOpen recognise the character 'u' in the mode
 * string, which forces the file to be opened unmapped.
 */
TIFF*
TIFFFdOpen(int ifd, const char* name, const char* mode)
{
    TIFF* tif;
    BOOL fSuppressMap = (mode[1] == 'u' || mode[2] == 'u');

    tif = TIFFClientOpen(name, mode,
         (thandle_t)ifd,
        _tiffReadProc, _tiffWriteProc,
        _tiffSeekProc, _tiffCloseProc, _tiffSizeProc,
         fSuppressMap ? _tiffDummyMapProc : _tiffMapProc,
         fSuppressMap ? _tiffDummyUnmapProc : _tiffUnmapProc);
    if (tif)
        tif->tif_fd = ifd;
    return (tif);
}

/*
 * Open a TIFF file for read/writing.
 */
TIFF*
TIFFOpen(const char* name, const char* mode)
{
    static const char module[] = "TIFFOpen";
    thandle_t fd;
    int m;
    DWORD dwMode;

    m = _TIFFgetMode(mode, module);

    switch(m)
    {
    case O_RDONLY:
        dwMode = OPEN_EXISTING;
        break;
    case O_RDWR:
        dwMode = OPEN_ALWAYS;
        break;
    case O_RDWR|O_CREAT:
        dwMode = CREATE_NEW;
        break;
    case O_RDWR|O_TRUNC:
        dwMode = CREATE_ALWAYS;
        break;
    case O_RDWR|O_CREAT|O_TRUNC:
        dwMode = CREATE_ALWAYS;
        break;
    default:
        return ((TIFF*)0);
    }
    fd = (thandle_t)CreateFile(name, (m == O_RDONLY) ? GENERIC_READ :
            (GENERIC_READ | GENERIC_WRITE), FILE_SHARE_READ, NULL, dwMode,
            (m == O_RDONLY) ? FILE_ATTRIBUTE_READONLY : FILE_ATTRIBUTE_NORMAL, NULL);
    if (fd == INVALID_HANDLE_VALUE) {
        TIFFError(module, "%s: Cannot open", name);
        return ((TIFF *)0);
    }
    return (TIFFFdOpen((int)fd, name, mode));
}

tdata_t
_TIFFmalloc(tsize_t s)
{
    return ((tdata_t)GlobalAlloc(GMEM_FIXED, s));
}

void
_TIFFfree(tdata_t p)
{
    GlobalFree(p);
    return;
}

tdata_t
_TIFFrealloc(tdata_t p, tsize_t s)
{
    void* pvTmp;
    if ((pvTmp = GlobalReAlloc(p, s, 0)) == NULL) {
        if ((pvTmp = GlobalAlloc(GMEM_FIXED, s)) != NULL) {
            CopyMemory(pvTmp, p, s);
            GlobalFree(p);
        }
    }
    return ((tdata_t)pvTmp);
}

void
_TIFFmemset(void* p, int v, tsize_t c)
{
    FillMemory(p, c, (BYTE)v);
}

void
_TIFFmemcpy(void* d, const tdata_t s, tsize_t c)
{
    CopyMemory(d, s, c);
}

int
_TIFFmemcmp(const tdata_t p1, const tdata_t p2, tsize_t c)
{
    register const BYTE *pb1 = p1;
    register const BYTE *pb2 = p2;
    register DWORD dwTmp = c;
    register int iTmp;
    for (iTmp = 0; dwTmp-- && !iTmp; iTmp = (int)*pb1++ - (int)*pb2++)
        ;
    return (iTmp);
}

static void
Win32WarningHandler(const char* module, const char* fmt, va_list ap)
{
    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;
}
TIFFErrorHandler _TIFFwarningHandler = Win32WarningHandler;

static void
Win32ErrorHandler(const char* module, const char* fmt, va_list ap)
{
    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;
}
TIFFErrorHandler _TIFFerrorHandler = Win32ErrorHandler;
