/*?$Id:?tif_aux.cv?1.26?2010-07-01?15:33:28?dron?Exp?$?*/

/*
?*?Copyright?（c）?1991-1997?Sam?Leffler
?*?Copyright?（c）?1991-1997?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.
?*
?*?Auxiliary?Support?Routines.
?*/
#include?“tiffiop.h“
#include?“tif_predict.h“
#include?

uint32
_TIFFMultiply32（TIFF*?tif?uint32?first?uint32?second?const?char*?where）
{
????uint32?bytes?=?first?*?second;

????if?（second?&&?bytes?/?second?!=?first）?{
????????TIFFErrorExt（tif->tif_clientdata?where?“Integer?overflow?in?%s“?where）;
????????bytes?=?0;
????}

????return?bytes;
}

uint64
_TIFFMultiply64（TIFF*?tif?uint64?first?uint64?second?const?char*?where）
{
????uint64?bytes?=?first?*?second;

????if?（second?&&?bytes?/?second?!=?first）?{
????????TIFFErrorExt（tif->tif_clientdata?where?“Integer?overflow?in?%s“?where）;
????????bytes?=?0;
????}

????return?bytes;
}

void*
_TIFFCheckRealloc（TIFF*?tif?void*?buffer
??????????tmsize_t?nmemb?tmsize_t?elem_size?const?char*?what）
{
????void*?cp?=?NULL;
????tmsize_t?bytes?=?nmemb?*?elem_size;

????/*
?????*?XXX:?Check?for?integer?overflow.
?????*/
????if?（nmemb?&&?elem_size?&&?bytes?/?elem_size?==?nmemb）
????????cp?=?_TIFFrealloc（buffer?bytes）;

????if?（cp?==?NULL）?{
????????TIFFErrorExt（tif->tif_clientdata?tif->tif_name
?????????????????“Failed?to?allocate?memory?for?%s?“
?????????????????“（%ld?elements?of?%ld?bytes?each）“
?????????????????what（long）?nmemb?（long）?elem_size）;
????}

????return?cp;
}

void*
_TIFFCheckMalloc（TIFF*?tif?tmsize_t?nmemb?tmsize_t?elem_size?const?char*?what）
{
????return?_TIFFCheckRealloc（tif?NULL?nmemb?elem_size?what）;
}

static?int
TIFFDefaultTransferFunction（TIFFDirectory*?td）
{
????uint16?**tf?=?td->td_transferfunction;
????tmsize_t?i?n?nbytes;

????tf[0]?=?tf[1]?=?tf[2]?=?0;
????if?（td->td_bitspersample?>=?sizeof（tmsize_t）?*?8?-?2）
????????return?0;

????n?=?（（tmsize_t）1）<