| [95] | 1 | /* $Id: tif_fax3.h,v 1.5 2005/12/12 09:23:11 dron Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Copyright (c) 1990-1997 Sam Leffler
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| 5 | * Copyright (c) 1991-1997 Silicon Graphics, Inc.
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| 6 | *
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| 7 | * Permission to use, copy, modify, distribute, and sell this software and
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| 8 | * its documentation for any purpose is hereby granted without fee, provided
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| 9 | * that (i) the above copyright notices and this permission notice appear in
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| 10 | * all copies of the software and related documentation, and (ii) the names of
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| 11 | * Sam Leffler and Silicon Graphics may not be used in any advertising or
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| 12 | * publicity relating to the software without the specific, prior written
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| 13 | * permission of Sam Leffler and Silicon Graphics.
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| 14 | *
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| 15 | * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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| 16 | * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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| 17 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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| 18 | *
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| 19 | * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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| 20 | * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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| 21 | * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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| 22 | * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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| 23 | * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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| 24 | * OF THIS SOFTWARE.
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| 25 | */
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| 26 |
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| 27 | #ifndef _FAX3_
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| 28 | #define _FAX3_
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| 29 | /*
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| 30 | * TIFF Library.
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| 31 | *
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| 32 | * CCITT Group 3 (T.4) and Group 4 (T.6) Decompression Support.
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| 33 | *
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| 34 | * Decoder support is derived, with permission, from the code
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| 35 | * in Frank Cringle's viewfax program;
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| 36 | * Copyright (C) 1990, 1995 Frank D. Cringle.
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| 37 | */
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| 38 | #include "tiff.h"
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| 39 |
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| 40 | /*
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| 41 | * To override the default routine used to image decoded
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| 42 | * spans one can use the pseduo tag TIFFTAG_FAXFILLFUNC.
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| 43 | * The routine must have the type signature given below;
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| 44 | * for example:
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| 45 | *
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| 46 | * fillruns(unsigned char* buf, uint32* runs, uint32* erun, uint32 lastx)
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| 47 | *
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| 48 | * where buf is place to set the bits, runs is the array of b&w run
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| 49 | * lengths (white then black), erun is the last run in the array, and
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| 50 | * lastx is the width of the row in pixels. Fill routines can assume
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| 51 | * the run array has room for at least lastx runs and can overwrite
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| 52 | * data in the run array as needed (e.g. to append zero runs to bring
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| 53 | * the count up to a nice multiple).
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| 54 | */
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| 55 | typedef void (*TIFFFaxFillFunc)(unsigned char*, uint32*, uint32*, uint32);
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| 56 |
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| 57 | /*
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| 58 | * The default run filler; made external for other decoders.
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| 59 | */
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| 60 | #if defined(__cplusplus)
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| 61 | extern "C" {
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| 62 | #endif
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| 63 | extern void _TIFFFax3fillruns(unsigned char*, uint32*, uint32*, uint32);
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| 64 | #if defined(__cplusplus)
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| 65 | }
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| 66 | #endif
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| 67 |
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| 68 |
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| 69 | /* finite state machine codes */
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| 70 | #define S_Null 0
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| 71 | #define S_Pass 1
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| 72 | #define S_Horiz 2
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| 73 | #define S_V0 3
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| 74 | #define S_VR 4
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| 75 | #define S_VL 5
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| 76 | #define S_Ext 6
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| 77 | #define S_TermW 7
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| 78 | #define S_TermB 8
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| 79 | #define S_MakeUpW 9
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| 80 | #define S_MakeUpB 10
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| 81 | #define S_MakeUp 11
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| 82 | #define S_EOL 12
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| 83 |
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| 84 | typedef struct { /* state table entry */
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| 85 | unsigned char State; /* see above */
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| 86 | unsigned char Width; /* width of code in bits */
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| 87 | uint32 Param; /* unsigned 32-bit run length in bits */
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| 88 | } TIFFFaxTabEnt;
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| 89 |
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| 90 | extern const TIFFFaxTabEnt TIFFFaxMainTable[];
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| 91 | extern const TIFFFaxTabEnt TIFFFaxWhiteTable[];
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| 92 | extern const TIFFFaxTabEnt TIFFFaxBlackTable[];
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| 93 |
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| 94 | /*
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| 95 | * The following macros define the majority of the G3/G4 decoder
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| 96 | * algorithm using the state tables defined elsewhere. To build
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| 97 | * a decoder you need some setup code and some glue code. Note
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| 98 | * that you may also need/want to change the way the NeedBits*
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| 99 | * macros get input data if, for example, you know the data to be
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| 100 | * decoded is properly aligned and oriented (doing so before running
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| 101 | * the decoder can be a big performance win).
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| 102 | *
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| 103 | * Consult the decoder in the TIFF library for an idea of what you
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| 104 | * need to define and setup to make use of these definitions.
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| 105 | *
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| 106 | * NB: to enable a debugging version of these macros define FAX3_DEBUG
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| 107 | * before including this file. Trace output goes to stdout.
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| 108 | */
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| 109 |
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| 110 | #ifndef EndOfData
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| 111 | #define EndOfData() (cp >= ep)
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| 112 | #endif
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| 113 | /*
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| 114 | * Need <=8 or <=16 bits of input data. Unlike viewfax we
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| 115 | * cannot use/assume a word-aligned, properly bit swizzled
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| 116 | * input data set because data may come from an arbitrarily
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| 117 | * aligned, read-only source such as a memory-mapped file.
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| 118 | * Note also that the viewfax decoder does not check for
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| 119 | * running off the end of the input data buffer. This is
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| 120 | * possible for G3-encoded data because it prescans the input
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| 121 | * data to count EOL markers, but can cause problems for G4
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| 122 | * data. In any event, we don't prescan and must watch for
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| 123 | * running out of data since we can't permit the library to
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| 124 | * scan past the end of the input data buffer.
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| 125 | *
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| 126 | * Finally, note that we must handle remaindered data at the end
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| 127 | * of a strip specially. The coder asks for a fixed number of
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| 128 | * bits when scanning for the next code. This may be more bits
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| 129 | * than are actually present in the data stream. If we appear
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| 130 | * to run out of data but still have some number of valid bits
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| 131 | * remaining then we makeup the requested amount with zeros and
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| 132 | * return successfully. If the returned data is incorrect then
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| 133 | * we should be called again and get a premature EOF error;
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| 134 | * otherwise we should get the right answer.
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| 135 | */
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| 136 | #ifndef NeedBits8
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| 137 | #define NeedBits8(n,eoflab) do { \
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| 138 | if (BitsAvail < (n)) { \
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| 139 | if (EndOfData()) { \
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| 140 | if (BitsAvail == 0) /* no valid bits */ \
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| 141 | goto eoflab; \
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| 142 | BitsAvail = (n); /* pad with zeros */ \
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| 143 | } else { \
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| 144 | BitAcc |= ((uint32) bitmap[*cp++])<<BitsAvail; \
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| 145 | BitsAvail += 8; \
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| 146 | } \
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| 147 | } \
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| 148 | } while (0)
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| 149 | #endif
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| 150 | #ifndef NeedBits16
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| 151 | #define NeedBits16(n,eoflab) do { \
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| 152 | if (BitsAvail < (n)) { \
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| 153 | if (EndOfData()) { \
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| 154 | if (BitsAvail == 0) /* no valid bits */ \
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| 155 | goto eoflab; \
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| 156 | BitsAvail = (n); /* pad with zeros */ \
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| 157 | } else { \
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| 158 | BitAcc |= ((uint32) bitmap[*cp++])<<BitsAvail; \
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| 159 | if ((BitsAvail += 8) < (n)) { \
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| 160 | if (EndOfData()) { \
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| 161 | /* NB: we know BitsAvail is non-zero here */ \
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| 162 | BitsAvail = (n); /* pad with zeros */ \
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| 163 | } else { \
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| 164 | BitAcc |= ((uint32) bitmap[*cp++])<<BitsAvail; \
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| 165 | BitsAvail += 8; \
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| 166 | } \
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| 167 | } \
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| 168 | } \
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| 169 | } \
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| 170 | } while (0)
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| 171 | #endif
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| 172 | #define GetBits(n) (BitAcc & ((1<<(n))-1))
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| 173 | #define ClrBits(n) do { \
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| 174 | BitsAvail -= (n); \
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| 175 | BitAcc >>= (n); \
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| 176 | } while (0)
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| 177 |
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| 178 | #ifdef FAX3_DEBUG
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| 179 | static const char* StateNames[] = {
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| 180 | "Null ",
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| 181 | "Pass ",
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| 182 | "Horiz ",
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| 183 | "V0 ",
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| 184 | "VR ",
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| 185 | "VL ",
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| 186 | "Ext ",
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| 187 | "TermW ",
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| 188 | "TermB ",
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| 189 | "MakeUpW",
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| 190 | "MakeUpB",
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| 191 | "MakeUp ",
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| 192 | "EOL ",
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| 193 | };
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| 194 | #define DEBUG_SHOW putchar(BitAcc & (1 << t) ? '1' : '0')
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| 195 | #define LOOKUP8(wid,tab,eoflab) do { \
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| 196 | int t; \
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| 197 | NeedBits8(wid,eoflab); \
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| 198 | TabEnt = tab + GetBits(wid); \
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| 199 | printf("%08lX/%d: %s%5d\t", (long) BitAcc, BitsAvail, \
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| 200 | StateNames[TabEnt->State], TabEnt->Param); \
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| 201 | for (t = 0; t < TabEnt->Width; t++) \
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| 202 | DEBUG_SHOW; \
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| 203 | putchar('\n'); \
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| 204 | fflush(stdout); \
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| 205 | ClrBits(TabEnt->Width); \
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| 206 | } while (0)
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| 207 | #define LOOKUP16(wid,tab,eoflab) do { \
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| 208 | int t; \
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| 209 | NeedBits16(wid,eoflab); \
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| 210 | TabEnt = tab + GetBits(wid); \
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| 211 | printf("%08lX/%d: %s%5d\t", (long) BitAcc, BitsAvail, \
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| 212 | StateNames[TabEnt->State], TabEnt->Param); \
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| 213 | for (t = 0; t < TabEnt->Width; t++) \
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| 214 | DEBUG_SHOW; \
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| 215 | putchar('\n'); \
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| 216 | fflush(stdout); \
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| 217 | ClrBits(TabEnt->Width); \
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| 218 | } while (0)
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| 219 |
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| 220 | #define SETVALUE(x) do { \
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| 221 | *pa++ = RunLength + (x); \
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| 222 | printf("SETVALUE: %d\t%d\n", RunLength + (x), a0); \
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| 223 | a0 += x; \
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| 224 | RunLength = 0; \
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| 225 | } while (0)
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| 226 | #else
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| 227 | #define LOOKUP8(wid,tab,eoflab) do { \
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| 228 | NeedBits8(wid,eoflab); \
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| 229 | TabEnt = tab + GetBits(wid); \
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| 230 | ClrBits(TabEnt->Width); \
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| 231 | } while (0)
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| 232 | #define LOOKUP16(wid,tab,eoflab) do { \
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| 233 | NeedBits16(wid,eoflab); \
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| 234 | TabEnt = tab + GetBits(wid); \
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| 235 | ClrBits(TabEnt->Width); \
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| 236 | } while (0)
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| 237 |
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| 238 | /*
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| 239 | * Append a run to the run length array for the
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| 240 | * current row and reset decoding state.
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| 241 | */
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| 242 | #define SETVALUE(x) do { \
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| 243 | *pa++ = RunLength + (x); \
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| 244 | a0 += (x); \
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| 245 | RunLength = 0; \
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| 246 | } while (0)
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| 247 | #endif
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| 248 |
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| 249 | /*
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| 250 | * Synchronize input decoding at the start of each
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| 251 | * row by scanning for an EOL (if appropriate) and
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| 252 | * skipping any trash data that might be present
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| 253 | * after a decoding error. Note that the decoding
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| 254 | * done elsewhere that recognizes an EOL only consumes
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| 255 | * 11 consecutive zero bits. This means that if EOLcnt
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| 256 | * is non-zero then we still need to scan for the final flag
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| 257 | * bit that is part of the EOL code.
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| 258 | */
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| 259 | #define SYNC_EOL(eoflab) do { \
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| 260 | if (EOLcnt == 0) { \
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| 261 | for (;;) { \
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| 262 | NeedBits16(11,eoflab); \
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| 263 | if (GetBits(11) == 0) \
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| 264 | break; \
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| 265 | ClrBits(1); \
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| 266 | } \
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| 267 | } \
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| 268 | for (;;) { \
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| 269 | NeedBits8(8,eoflab); \
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| 270 | if (GetBits(8)) \
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| 271 | break; \
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| 272 | ClrBits(8); \
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| 273 | } \
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| 274 | while (GetBits(1) == 0) \
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| 275 | ClrBits(1); \
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| 276 | ClrBits(1); /* EOL bit */ \
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| 277 | EOLcnt = 0; /* reset EOL counter/flag */ \
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| 278 | } while (0)
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| 279 |
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| 280 | /*
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| 281 | * Cleanup the array of runs after decoding a row.
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| 282 | * We adjust final runs to insure the user buffer is not
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| 283 | * overwritten and/or undecoded area is white filled.
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| 284 | */
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| 285 | #define CLEANUP_RUNS() do { \
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| 286 | if (RunLength) \
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| 287 | SETVALUE(0); \
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| 288 | if (a0 != lastx) { \
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| 289 | badlength(a0, lastx); \
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| 290 | while (a0 > lastx && pa > thisrun) \
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| 291 | a0 -= *--pa; \
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| 292 | if (a0 < lastx) { \
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| 293 | if (a0 < 0) \
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| 294 | a0 = 0; \
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| 295 | if ((pa-thisrun)&1) \
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| 296 | SETVALUE(0); \
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| 297 | SETVALUE(lastx - a0); \
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| 298 | } else if (a0 > lastx) { \
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| 299 | SETVALUE(lastx); \
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| 300 | SETVALUE(0); \
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| 301 | } \
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| 302 | } \
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| 303 | } while (0)
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| 304 |
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| 305 | /*
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| 306 | * Decode a line of 1D-encoded data.
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| 307 | *
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| 308 | * The line expanders are written as macros so that they can be reused
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| 309 | * but still have direct access to the local variables of the "calling"
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| 310 | * function.
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| 311 | *
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| 312 | * Note that unlike the original version we have to explicitly test for
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| 313 | * a0 >= lastx after each black/white run is decoded. This is because
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| 314 | * the original code depended on the input data being zero-padded to
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| 315 | * insure the decoder recognized an EOL before running out of data.
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| 316 | */
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| 317 | #define EXPAND1D(eoflab) do { \
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| 318 | for (;;) { \
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| 319 | for (;;) { \
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| 320 | LOOKUP16(12, TIFFFaxWhiteTable, eof1d); \
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| 321 | switch (TabEnt->State) { \
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| 322 | case S_EOL: \
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| 323 | EOLcnt = 1; \
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| 324 | goto done1d; \
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| 325 | case S_TermW: \
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| 326 | SETVALUE(TabEnt->Param); \
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| 327 | goto doneWhite1d; \
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| 328 | case S_MakeUpW: \
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| 329 | case S_MakeUp: \
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| 330 | a0 += TabEnt->Param; \
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| 331 | RunLength += TabEnt->Param; \
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| 332 | break; \
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| 333 | default: \
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| 334 | unexpected("WhiteTable", a0); \
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| 335 | goto done1d; \
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| 336 | } \
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| 337 | } \
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| 338 | doneWhite1d: \
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| 339 | if (a0 >= lastx) \
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| 340 | goto done1d; \
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| 341 | for (;;) { \
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| 342 | LOOKUP16(13, TIFFFaxBlackTable, eof1d); \
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| 343 | switch (TabEnt->State) { \
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| 344 | case S_EOL: \
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| 345 | EOLcnt = 1; \
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| 346 | goto done1d; \
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| 347 | case S_TermB: \
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| 348 | SETVALUE(TabEnt->Param); \
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| 349 | goto doneBlack1d; \
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| 350 | case S_MakeUpB: \
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| 351 | case S_MakeUp: \
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| 352 | a0 += TabEnt->Param; \
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| 353 | RunLength += TabEnt->Param; \
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| 354 | break; \
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| 355 | default: \
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| 356 | unexpected("BlackTable", a0); \
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| 357 | goto done1d; \
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| 358 | } \
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| 359 | } \
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| 360 | doneBlack1d: \
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| 361 | if (a0 >= lastx) \
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| 362 | goto done1d; \
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| 363 | if( *(pa-1) == 0 && *(pa-2) == 0 ) \
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| 364 | pa -= 2; \
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| 365 | } \
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| 366 | eof1d: \
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| 367 | prematureEOF(a0); \
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| 368 | CLEANUP_RUNS(); \
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| 369 | goto eoflab; \
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| 370 | done1d: \
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| 371 | CLEANUP_RUNS(); \
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| 372 | } while (0)
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| 373 |
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| 374 | /*
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| 375 | * Update the value of b1 using the array
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| 376 | * of runs for the reference line.
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| 377 | */
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| 378 | #define CHECK_b1 do { \
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| 379 | if (pa != thisrun) while (b1 <= a0 && b1 < lastx) { \
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| 380 | b1 += pb[0] + pb[1]; \
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| 381 | pb += 2; \
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| 382 | } \
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| 383 | } while (0)
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| 384 |
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| 385 | /*
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| 386 | * Expand a row of 2D-encoded data.
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| 387 | */
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| 388 | #define EXPAND2D(eoflab) do { \
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| 389 | while (a0 < lastx) { \
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| 390 | LOOKUP8(7, TIFFFaxMainTable, eof2d); \
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| 391 | switch (TabEnt->State) { \
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| 392 | case S_Pass: \
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| 393 | CHECK_b1; \
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| 394 | b1 += *pb++; \
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| 395 | RunLength += b1 - a0; \
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| 396 | a0 = b1; \
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| 397 | b1 += *pb++; \
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| 398 | break; \
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| 399 | case S_Horiz: \
|
|---|
| 400 | if ((pa-thisrun)&1) { \
|
|---|
| 401 | for (;;) { /* black first */ \
|
|---|
| 402 | LOOKUP16(13, TIFFFaxBlackTable, eof2d); \
|
|---|
| 403 | switch (TabEnt->State) { \
|
|---|
| 404 | case S_TermB: \
|
|---|
| 405 | SETVALUE(TabEnt->Param); \
|
|---|
| 406 | goto doneWhite2da; \
|
|---|
| 407 | case S_MakeUpB: \
|
|---|
| 408 | case S_MakeUp: \
|
|---|
| 409 | a0 += TabEnt->Param; \
|
|---|
| 410 | RunLength += TabEnt->Param; \
|
|---|
| 411 | break; \
|
|---|
| 412 | default: \
|
|---|
| 413 | goto badBlack2d; \
|
|---|
| 414 | } \
|
|---|
| 415 | } \
|
|---|
| 416 | doneWhite2da:; \
|
|---|
| 417 | for (;;) { /* then white */ \
|
|---|
| 418 | LOOKUP16(12, TIFFFaxWhiteTable, eof2d); \
|
|---|
| 419 | switch (TabEnt->State) { \
|
|---|
| 420 | case S_TermW: \
|
|---|
| 421 | SETVALUE(TabEnt->Param); \
|
|---|
| 422 | goto doneBlack2da; \
|
|---|
| 423 | case S_MakeUpW: \
|
|---|
| 424 | case S_MakeUp: \
|
|---|
| 425 | a0 += TabEnt->Param; \
|
|---|
| 426 | RunLength += TabEnt->Param; \
|
|---|
| 427 | break; \
|
|---|
| 428 | default: \
|
|---|
| 429 | goto badWhite2d; \
|
|---|
| 430 | } \
|
|---|
| 431 | } \
|
|---|
| 432 | doneBlack2da:; \
|
|---|
| 433 | } else { \
|
|---|
| 434 | for (;;) { /* white first */ \
|
|---|
| 435 | LOOKUP16(12, TIFFFaxWhiteTable, eof2d); \
|
|---|
| 436 | switch (TabEnt->State) { \
|
|---|
| 437 | case S_TermW: \
|
|---|
| 438 | SETVALUE(TabEnt->Param); \
|
|---|
| 439 | goto doneWhite2db; \
|
|---|
| 440 | case S_MakeUpW: \
|
|---|
| 441 | case S_MakeUp: \
|
|---|
| 442 | a0 += TabEnt->Param; \
|
|---|
| 443 | RunLength += TabEnt->Param; \
|
|---|
| 444 | break; \
|
|---|
| 445 | default: \
|
|---|
| 446 | goto badWhite2d; \
|
|---|
| 447 | } \
|
|---|
| 448 | } \
|
|---|
| 449 | doneWhite2db:; \
|
|---|
| 450 | for (;;) { /* then black */ \
|
|---|
| 451 | LOOKUP16(13, TIFFFaxBlackTable, eof2d); \
|
|---|
| 452 | switch (TabEnt->State) { \
|
|---|
| 453 | case S_TermB: \
|
|---|
| 454 | SETVALUE(TabEnt->Param); \
|
|---|
| 455 | goto doneBlack2db; \
|
|---|
| 456 | case S_MakeUpB: \
|
|---|
| 457 | case S_MakeUp: \
|
|---|
| 458 | a0 += TabEnt->Param; \
|
|---|
| 459 | RunLength += TabEnt->Param; \
|
|---|
| 460 | break; \
|
|---|
| 461 | default: \
|
|---|
| 462 | goto badBlack2d; \
|
|---|
| 463 | } \
|
|---|
| 464 | } \
|
|---|
| 465 | doneBlack2db:; \
|
|---|
| 466 | } \
|
|---|
| 467 | CHECK_b1; \
|
|---|
| 468 | break; \
|
|---|
| 469 | case S_V0: \
|
|---|
| 470 | CHECK_b1; \
|
|---|
| 471 | SETVALUE(b1 - a0); \
|
|---|
| 472 | b1 += *pb++; \
|
|---|
| 473 | break; \
|
|---|
| 474 | case S_VR: \
|
|---|
| 475 | CHECK_b1; \
|
|---|
| 476 | SETVALUE(b1 - a0 + TabEnt->Param); \
|
|---|
| 477 | b1 += *pb++; \
|
|---|
| 478 | break; \
|
|---|
| 479 | case S_VL: \
|
|---|
| 480 | CHECK_b1; \
|
|---|
| 481 | SETVALUE(b1 - a0 - TabEnt->Param); \
|
|---|
| 482 | b1 -= *--pb; \
|
|---|
| 483 | break; \
|
|---|
| 484 | case S_Ext: \
|
|---|
| 485 | *pa++ = lastx - a0; \
|
|---|
| 486 | extension(a0); \
|
|---|
| 487 | goto eol2d; \
|
|---|
| 488 | case S_EOL: \
|
|---|
| 489 | *pa++ = lastx - a0; \
|
|---|
| 490 | NeedBits8(4,eof2d); \
|
|---|
| 491 | if (GetBits(4)) \
|
|---|
| 492 | unexpected("EOL", a0); \
|
|---|
| 493 | ClrBits(4); \
|
|---|
| 494 | EOLcnt = 1; \
|
|---|
| 495 | goto eol2d; \
|
|---|
| 496 | default: \
|
|---|
| 497 | badMain2d: \
|
|---|
| 498 | unexpected("MainTable", a0); \
|
|---|
| 499 | goto eol2d; \
|
|---|
| 500 | badBlack2d: \
|
|---|
| 501 | unexpected("BlackTable", a0); \
|
|---|
| 502 | goto eol2d; \
|
|---|
| 503 | badWhite2d: \
|
|---|
| 504 | unexpected("WhiteTable", a0); \
|
|---|
| 505 | goto eol2d; \
|
|---|
| 506 | eof2d: \
|
|---|
| 507 | prematureEOF(a0); \
|
|---|
| 508 | CLEANUP_RUNS(); \
|
|---|
| 509 | goto eoflab; \
|
|---|
| 510 | } \
|
|---|
| 511 | } \
|
|---|
| 512 | if (RunLength) { \
|
|---|
| 513 | if (RunLength + a0 < lastx) { \
|
|---|
| 514 | /* expect a final V0 */ \
|
|---|
| 515 | NeedBits8(1,eof2d); \
|
|---|
| 516 | if (!GetBits(1)) \
|
|---|
| 517 | goto badMain2d; \
|
|---|
| 518 | ClrBits(1); \
|
|---|
| 519 | } \
|
|---|
| 520 | SETVALUE(0); \
|
|---|
| 521 | } \
|
|---|
| 522 | eol2d: \
|
|---|
| 523 | CLEANUP_RUNS(); \
|
|---|
| 524 | } while (0)
|
|---|
| 525 | #endif /* _FAX3_ */
|
|---|
