311 lines
9.1 KiB
C
311 lines
9.1 KiB
C
/* $Id: tif_swab.c,v 1.13 2010-03-10 18:56:49 bfriesen Exp $ */
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/*
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* Copyright (c) 1988-1997 Sam Leffler
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* Copyright (c) 1991-1997 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the names of
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* Sam Leffler and Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Sam Leffler and Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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/*
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* TIFF Library Bit & Byte Swapping Support.
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*
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* XXX We assume short = 16-bits and long = 32-bits XXX
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*/
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#include "tiffiop.h"
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#ifndef TIFFSwabShort
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void
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TIFFSwabShort(uint16* wp)
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{
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register unsigned char* cp = (unsigned char*) wp;
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unsigned char t;
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assert(sizeof(uint16)==2);
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t = cp[1]; cp[1] = cp[0]; cp[0] = t;
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}
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#endif
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#ifndef TIFFSwabLong
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void
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TIFFSwabLong(uint32* lp)
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{
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register unsigned char* cp = (unsigned char*) lp;
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unsigned char t;
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assert(sizeof(uint32)==4);
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t = cp[3]; cp[3] = cp[0]; cp[0] = t;
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t = cp[2]; cp[2] = cp[1]; cp[1] = t;
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}
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#endif
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#ifndef TIFFSwabLong8
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void
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TIFFSwabLong8(uint64* lp)
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{
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register unsigned char* cp = (unsigned char*) lp;
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unsigned char t;
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assert(sizeof(uint64)==8);
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t = cp[7]; cp[7] = cp[0]; cp[0] = t;
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t = cp[6]; cp[6] = cp[1]; cp[1] = t;
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t = cp[5]; cp[5] = cp[2]; cp[2] = t;
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t = cp[4]; cp[4] = cp[3]; cp[3] = t;
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}
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#endif
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#ifndef TIFFSwabArrayOfShort
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void
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TIFFSwabArrayOfShort(register uint16* wp, tmsize_t n)
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{
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register unsigned char* cp;
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register unsigned char t;
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assert(sizeof(uint16)==2);
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/* XXX unroll loop some */
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while (n-- > 0) {
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cp = (unsigned char*) wp;
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t = cp[1]; cp[1] = cp[0]; cp[0] = t;
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wp++;
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}
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}
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#endif
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#ifndef TIFFSwabArrayOfTriples
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void
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TIFFSwabArrayOfTriples(register uint8* tp, tmsize_t n)
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{
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unsigned char* cp;
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unsigned char t;
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/* XXX unroll loop some */
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while (n-- > 0) {
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cp = (unsigned char*) tp;
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t = cp[2]; cp[2] = cp[0]; cp[0] = t;
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tp += 3;
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}
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}
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#endif
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#ifndef TIFFSwabArrayOfLong
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void
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TIFFSwabArrayOfLong(register uint32* lp, tmsize_t n)
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{
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register unsigned char *cp;
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register unsigned char t;
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assert(sizeof(uint32)==4);
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/* XXX unroll loop some */
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while (n-- > 0) {
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cp = (unsigned char *)lp;
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t = cp[3]; cp[3] = cp[0]; cp[0] = t;
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t = cp[2]; cp[2] = cp[1]; cp[1] = t;
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lp++;
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}
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}
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#endif
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#ifndef TIFFSwabArrayOfLong8
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void
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TIFFSwabArrayOfLong8(register uint64* lp, tmsize_t n)
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{
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register unsigned char *cp;
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register unsigned char t;
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assert(sizeof(uint64)==8);
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/* XXX unroll loop some */
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while (n-- > 0) {
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cp = (unsigned char *)lp;
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t = cp[7]; cp[7] = cp[0]; cp[0] = t;
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t = cp[6]; cp[6] = cp[1]; cp[1] = t;
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t = cp[5]; cp[5] = cp[2]; cp[2] = t;
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t = cp[4]; cp[4] = cp[3]; cp[3] = t;
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lp++;
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}
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}
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#endif
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#ifndef TIFFSwabFloat
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void
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TIFFSwabFloat(float* fp)
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{
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register unsigned char* cp = (unsigned char*) fp;
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unsigned char t;
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assert(sizeof(float)==4);
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t = cp[3]; cp[3] = cp[0]; cp[0] = t;
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t = cp[2]; cp[2] = cp[1]; cp[1] = t;
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}
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#endif
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#ifndef TIFFSwabArrayOfFloat
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void
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TIFFSwabArrayOfFloat(register float* fp, tmsize_t n)
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{
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register unsigned char *cp;
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register unsigned char t;
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assert(sizeof(float)==4);
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/* XXX unroll loop some */
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while (n-- > 0) {
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cp = (unsigned char *)fp;
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t = cp[3]; cp[3] = cp[0]; cp[0] = t;
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t = cp[2]; cp[2] = cp[1]; cp[1] = t;
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fp++;
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}
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}
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#endif
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#ifndef TIFFSwabDouble
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void
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TIFFSwabDouble(double *dp)
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{
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register unsigned char* cp = (unsigned char*) dp;
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unsigned char t;
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assert(sizeof(double)==8);
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t = cp[7]; cp[7] = cp[0]; cp[0] = t;
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t = cp[6]; cp[6] = cp[1]; cp[1] = t;
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t = cp[5]; cp[5] = cp[2]; cp[2] = t;
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t = cp[4]; cp[4] = cp[3]; cp[3] = t;
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}
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#endif
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#ifndef TIFFSwabArrayOfDouble
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void
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TIFFSwabArrayOfDouble(double* dp, tmsize_t n)
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{
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register unsigned char *cp;
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register unsigned char t;
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assert(sizeof(double)==8);
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/* XXX unroll loop some */
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while (n-- > 0) {
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cp = (unsigned char *)dp;
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t = cp[7]; cp[7] = cp[0]; cp[0] = t;
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t = cp[6]; cp[6] = cp[1]; cp[1] = t;
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t = cp[5]; cp[5] = cp[2]; cp[2] = t;
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t = cp[4]; cp[4] = cp[3]; cp[3] = t;
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dp++;
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}
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}
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#endif
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/*
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* Bit reversal tables. TIFFBitRevTable[<byte>] gives
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* the bit reversed value of <byte>. Used in various
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* places in the library when the FillOrder requires
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* bit reversal of byte values (e.g. CCITT Fax 3
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* encoding/decoding). TIFFNoBitRevTable is provided
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* for algorithms that want an equivalent table that
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* do not reverse bit values.
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*/
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static const unsigned char TIFFBitRevTable[256] = {
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0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
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0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
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0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
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0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
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0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
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0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
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0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
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0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
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0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
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0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
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0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
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0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
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0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
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0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
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0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
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0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
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0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
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0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
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0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
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0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
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0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
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0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
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0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
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0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
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0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
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0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
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0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
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0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
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0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
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0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
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0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
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0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
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};
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static const unsigned char TIFFNoBitRevTable[256] = {
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
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0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
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0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
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0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
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0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
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0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
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0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
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0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
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0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
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0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
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0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
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0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
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0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
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0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
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0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
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0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
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0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
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0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
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0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
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0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
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0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
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0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
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0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
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0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
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0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
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0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
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0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
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0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
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0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff,
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};
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const unsigned char*
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TIFFGetBitRevTable(int reversed)
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{
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return (reversed ? TIFFBitRevTable : TIFFNoBitRevTable);
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}
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void
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TIFFReverseBits(uint8* cp, tmsize_t n)
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{
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for (; n > 8; n -= 8) {
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cp[0] = TIFFBitRevTable[cp[0]];
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cp[1] = TIFFBitRevTable[cp[1]];
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cp[2] = TIFFBitRevTable[cp[2]];
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cp[3] = TIFFBitRevTable[cp[3]];
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cp[4] = TIFFBitRevTable[cp[4]];
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cp[5] = TIFFBitRevTable[cp[5]];
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cp[6] = TIFFBitRevTable[cp[6]];
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cp[7] = TIFFBitRevTable[cp[7]];
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cp += 8;
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}
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while (n-- > 0)
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*cp = TIFFBitRevTable[*cp], cp++;
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}
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/* vim: set ts=8 sts=8 sw=8 noet: */
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/*
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* Local Variables:
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* mode: c
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* c-basic-offset: 8
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* fill-column: 78
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* End:
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*/
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