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/*
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* Copyright (c) 1990-1997 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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#ifndef _FAX3_
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#define _FAX3_
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/*
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* TIFF Library.
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*
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* CCITT Group 3 (T.4) and Group 4 (T.6) Decompression Support.
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*
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* Decoder support is derived, with permission, from the code
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* in Frank Cringle's viewfax program;
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* Copyright (C) 1990, 1995 Frank D. Cringle.
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*/
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#include "tiff.h"
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/*
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* To override the default routine used to image decoded
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* spans one can use the pseudo tag TIFFTAG_FAXFILLFUNC.
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* The routine must have the type signature given below;
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* for example:
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*
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* fillruns(unsigned char* buf, uint32_t* runs, uint32_t* erun, uint32_t lastx)
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*
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* where buf is place to set the bits, runs is the array of b&w run
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* lengths (white then black), erun is the last run in the array, and
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* lastx is the width of the row in pixels. Fill routines can assume
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* the run array has room for at least lastx runs and can overwrite
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* data in the run array as needed (e.g. to append zero runs to bring
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* the count up to a nice multiple).
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*/
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typedef void (*TIFFFaxFillFunc)(unsigned char *, uint32_t *, uint32_t *,
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uint32_t);
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/*
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* The default run filler; made external for other decoders.
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*/
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#if defined(__cplusplus)
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extern "C"
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{
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#endif
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extern void _TIFFFax3fillruns(unsigned char *, uint32_t *, uint32_t *,
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uint32_t);
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#if defined(__cplusplus)
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}
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#endif
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/* finite state machine codes */
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#define S_Null 0
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#define S_Pass 1
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#define S_Horiz 2
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#define S_V0 3
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#define S_VR 4
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#define S_VL 5
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#define S_Ext 6
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#define S_TermW 7
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#define S_TermB 8
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#define S_MakeUpW 9
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#define S_MakeUpB 10
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#define S_MakeUp 11
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#define S_EOL 12
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/* WARNING: do not change the layout of this structure as the HylaFAX software
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*/
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/* really depends on it. See http://bugzilla.maptools.org/show_bug.cgi?id=2636
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*/
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typedef struct
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{ /* state table entry */
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unsigned char State; /* see above */
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unsigned char Width; /* width of code in bits */
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uint32_t Param; /* unsigned 32-bit run length in bits (holds on 16 bit
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actually, but cannot be changed. See above warning) */
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} TIFFFaxTabEnt;
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extern const TIFFFaxTabEnt TIFFFaxMainTable[];
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extern const TIFFFaxTabEnt TIFFFaxWhiteTable[];
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extern const TIFFFaxTabEnt TIFFFaxBlackTable[];
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/*
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* The following macros define the majority of the G3/G4 decoder
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* algorithm using the state tables defined elsewhere. To build
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* a decoder you need some setup code and some glue code. Note
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* that you may also need/want to change the way the NeedBits*
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* macros get input data if, for example, you know the data to be
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* decoded is properly aligned and oriented (doing so before running
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* the decoder can be a big performance win).
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*
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* Consult the decoder in the TIFF library for an idea of what you
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* need to define and setup to make use of these definitions.
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*
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* NB: to enable a debugging version of these macros define FAX3_DEBUG
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* before including this file. Trace output goes to stdout.
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*/
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#ifndef EndOfData
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#define EndOfData() (cp >= ep)
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#endif
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/*
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* Need <=8 or <=16 bits of input data. Unlike viewfax we
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* cannot use/assume a word-aligned, properly bit swizzled
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* input data set because data may come from an arbitrarily
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* aligned, read-only source such as a memory-mapped file.
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* Note also that the viewfax decoder does not check for
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* running off the end of the input data buffer. This is
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* possible for G3-encoded data because it prescans the input
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* data to count EOL markers, but can cause problems for G4
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* data. In any event, we don't prescan and must watch for
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* running out of data since we can't permit the library to
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* scan past the end of the input data buffer.
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*
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* Finally, note that we must handle remaindered data at the end
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* of a strip specially. The coder asks for a fixed number of
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* bits when scanning for the next code. This may be more bits
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* than are actually present in the data stream. If we appear
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* to run out of data but still have some number of valid bits
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* remaining then we makeup the requested amount with zeros and
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* return successfully. If the returned data is incorrect then
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* we should be called again and get a premature EOF error;
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* otherwise we should get the right answer.
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*/
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#ifndef NeedBits8
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#define NeedBits8(n, eoflab) \
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do \
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{ \
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if (BitsAvail < (n)) \
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{ \
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if (EndOfData()) \
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{ \
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if (BitsAvail == 0) /* no valid bits */ \
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goto eoflab; \
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BitsAvail = (n); /* pad with zeros */ \
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} \
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else \
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{ \
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BitAcc |= ((uint32_t)bitmap[*cp++]) << BitsAvail; \
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BitsAvail += 8; \
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} \
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} \
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} while (0)
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#endif
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#ifndef NeedBits16
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#define NeedBits16(n, eoflab) \
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do \
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{ \
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if (BitsAvail < (n)) \
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{ \
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if (EndOfData()) \
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{ \
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if (BitsAvail == 0) /* no valid bits */ \
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goto eoflab; \
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BitsAvail = (n); /* pad with zeros */ \
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} \
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else \
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{ \
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BitAcc |= ((uint32_t)bitmap[*cp++]) << BitsAvail; \
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if ((BitsAvail += 8) < (n)) \
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{ \
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if (EndOfData()) \
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{ \
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/* NB: we know BitsAvail is non-zero here */ \
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BitsAvail = (n); /* pad with zeros */ \
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} \
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else \
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{ \
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BitAcc |= ((uint32_t)bitmap[*cp++]) << BitsAvail; \
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BitsAvail += 8; \
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} \
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} \
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} \
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} \
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} while (0)
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#endif
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#define GetBits(n) (BitAcc & ((1 << (n)) - 1))
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#define ClrBits(n) \
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do \
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{ \
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BitsAvail -= (n); \
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BitAcc >>= (n); \
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} while (0)
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#ifdef FAX3_DEBUG
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|
|
static const char *StateNames[] = {
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|
|
"Null ", "Pass ", "Horiz ", "V0 ", "VR ", "VL ", "Ext ",
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|
|
"TermW ", "TermB ", "MakeUpW", "MakeUpB", "MakeUp ", "EOL ",
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|
|
};
|
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#define DEBUG_SHOW putchar(BitAcc & (1 << t) ? '1' : '0')
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|
|
#define LOOKUP8(wid, tab, eoflab) \
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do \
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{ \
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|
|
int t; \
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|
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|
NeedBits8(wid, eoflab); \
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TabEnt = tab + GetBits(wid); \
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|
printf("%08lX/%d: %s%5d\t", (long)BitAcc, BitsAvail, \
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|
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StateNames[TabEnt->State], TabEnt->Param); \
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|
|
|
for (t = 0; t < TabEnt->Width; t++) \
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|
|
DEBUG_SHOW; \
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|
|
|
putchar('\n'); \
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|
|
fflush(stdout); \
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|
|
|
|
ClrBits(TabEnt->Width); \
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|
|
|
} while (0)
|
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|
|
#define LOOKUP16(wid, tab, eoflab) \
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|
do \
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|
|
|
|
{ \
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|
|
|
|
int t; \
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|
|
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NeedBits16(wid, eoflab); \
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TabEnt = tab + GetBits(wid); \
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printf("%08lX/%d: %s%5d\t", (long)BitAcc, BitsAvail, \
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|
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StateNames[TabEnt->State], TabEnt->Param); \
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|
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for (t = 0; t < TabEnt->Width; t++) \
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DEBUG_SHOW; \
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putchar('\n'); \
|
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|
|
fflush(stdout); \
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|
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ClrBits(TabEnt->Width); \
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|
|
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} while (0)
|
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|
#define SETVALUE(x) \
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|
do \
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|
|
|
|
{ \
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|
|
|
|
*pa++ = RunLength + (x); \
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|
|
printf("SETVALUE: %d\t%d\n", RunLength + (x), a0); \
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|
|
a0 += x; \
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|
RunLength = 0; \
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|
|
|
|
} while (0)
|
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|
|
|
#else
|
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|
|
|
#define LOOKUP8(wid, tab, eoflab) \
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|
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do \
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|
|
|
|
{ \
|
|
|
|
|
NeedBits8(wid, eoflab); \
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|
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|
TabEnt = tab + GetBits(wid); \
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|
|
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ClrBits(TabEnt->Width); \
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|
|
|
|
} while (0)
|
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|
|
|
#define LOOKUP16(wid, tab, eoflab) \
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|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
NeedBits16(wid, eoflab); \
|
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|
|
|
TabEnt = tab + GetBits(wid); \
|
|
|
|
|
ClrBits(TabEnt->Width); \
|
|
|
|
|
} while (0)
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Append a run to the run length array for the
|
|
|
|
|
* current row and reset decoding state.
|
|
|
|
|
*/
|
|
|
|
|
#define SETVALUE(x) \
|
|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
if (pa >= thisrun + sp->nruns) \
|
|
|
|
|
{ \
|
|
|
|
|
TIFFErrorExtR(tif, module, "Buffer overflow at line %u of %s %u", \
|
|
|
|
|
sp->line, isTiled(tif) ? "tile" : "strip", \
|
|
|
|
|
isTiled(tif) ? tif->tif_curtile \
|
|
|
|
|
: tif->tif_curstrip); \
|
|
|
|
|
return (-1); \
|
|
|
|
|
} \
|
|
|
|
|
*pa++ = RunLength + (x); \
|
|
|
|
|
a0 += (x); \
|
|
|
|
|
RunLength = 0; \
|
|
|
|
|
} while (0)
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Synchronize input decoding at the start of each
|
|
|
|
|
* row by scanning for an EOL (if appropriate) and
|
|
|
|
|
* skipping any trash data that might be present
|
|
|
|
|
* after a decoding error. Note that the decoding
|
|
|
|
|
* done elsewhere that recognizes an EOL only consumes
|
|
|
|
|
* 11 consecutive zero bits. This means that if EOLcnt
|
|
|
|
|
* is non-zero then we still need to scan for the final flag
|
|
|
|
|
* bit that is part of the EOL code.
|
|
|
|
|
*/
|
|
|
|
|
#define SYNC_EOL(eoflab) \
|
|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
if (EOLcnt == 0) \
|
|
|
|
|
{ \
|
|
|
|
|
for (;;) \
|
|
|
|
|
{ \
|
|
|
|
|
NeedBits16(11, eoflab); \
|
|
|
|
|
if (GetBits(11) == 0) \
|
|
|
|
|
break; \
|
|
|
|
|
ClrBits(1); \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
for (;;) \
|
|
|
|
|
{ \
|
|
|
|
|
NeedBits8(8, eoflab); \
|
|
|
|
|
if (GetBits(8)) \
|
|
|
|
|
break; \
|
|
|
|
|
ClrBits(8); \
|
|
|
|
|
} \
|
|
|
|
|
while (GetBits(1) == 0) \
|
|
|
|
|
ClrBits(1); \
|
|
|
|
|
ClrBits(1); /* EOL bit */ \
|
|
|
|
|
EOLcnt = 0; /* reset EOL counter/flag */ \
|
|
|
|
|
} while (0)
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Cleanup the array of runs after decoding a row.
|
|
|
|
|
* We adjust final runs to insure the user buffer is not
|
|
|
|
|
* overwritten and/or undecoded area is white filled.
|
|
|
|
|
*/
|
|
|
|
|
#define CLEANUP_RUNS() \
|
|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
if (RunLength) \
|
|
|
|
|
SETVALUE(0); \
|
|
|
|
|
if (a0 != lastx) \
|
|
|
|
|
{ \
|
|
|
|
|
badlength(a0, lastx); \
|
|
|
|
|
while (a0 > lastx && pa > thisrun) \
|
|
|
|
|
a0 -= *--pa; \
|
|
|
|
|
if (a0 < lastx) \
|
|
|
|
|
{ \
|
|
|
|
|
if (a0 < 0) \
|
|
|
|
|
a0 = 0; \
|
|
|
|
|
if ((pa - thisrun) & 1) \
|
|
|
|
|
SETVALUE(0); \
|
|
|
|
|
SETVALUE(lastx - a0); \
|
|
|
|
|
} \
|
|
|
|
|
else if (a0 > lastx) \
|
|
|
|
|
{ \
|
|
|
|
|
SETVALUE(lastx); \
|
|
|
|
|
SETVALUE(0); \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
} while (0)
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Decode a line of 1D-encoded data.
|
|
|
|
|
*
|
|
|
|
|
* The line expanders are written as macros so that they can be reused
|
|
|
|
|
* but still have direct access to the local variables of the "calling"
|
|
|
|
|
* function.
|
|
|
|
|
*
|
|
|
|
|
* Note that unlike the original version we have to explicitly test for
|
|
|
|
|
* a0 >= lastx after each black/white run is decoded. This is because
|
|
|
|
|
* the original code depended on the input data being zero-padded to
|
|
|
|
|
* insure the decoder recognized an EOL before running out of data.
|
|
|
|
|
*/
|
|
|
|
|
#define EXPAND1D(eoflab) \
|
|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
for (;;) \
|
|
|
|
|
{ \
|
|
|
|
|
for (;;) \
|
|
|
|
|
{ \
|
|
|
|
|
LOOKUP16(12, TIFFFaxWhiteTable, eof1d); \
|
|
|
|
|
switch (TabEnt->State) \
|
|
|
|
|
{ \
|
|
|
|
|
case S_EOL: \
|
|
|
|
|
EOLcnt = 1; \
|
|
|
|
|
goto done1d; \
|
|
|
|
|
case S_TermW: \
|
|
|
|
|
SETVALUE(TabEnt->Param); \
|
|
|
|
|
goto doneWhite1d; \
|
|
|
|
|
case S_MakeUpW: \
|
|
|
|
|
case S_MakeUp: \
|
|
|
|
|
a0 += TabEnt->Param; \
|
|
|
|
|
RunLength += TabEnt->Param; \
|
|
|
|
|
break; \
|
|
|
|
|
default: \
|
|
|
|
|
unexpected("WhiteTable", a0); \
|
|
|
|
|
goto done1d; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
doneWhite1d: \
|
|
|
|
|
if (a0 >= lastx) \
|
|
|
|
|
goto done1d; \
|
|
|
|
|
for (;;) \
|
|
|
|
|
{ \
|
|
|
|
|
LOOKUP16(13, TIFFFaxBlackTable, eof1d); \
|
|
|
|
|
switch (TabEnt->State) \
|
|
|
|
|
{ \
|
|
|
|
|
case S_EOL: \
|
|
|
|
|
EOLcnt = 1; \
|
|
|
|
|
goto done1d; \
|
|
|
|
|
case S_TermB: \
|
|
|
|
|
SETVALUE(TabEnt->Param); \
|
|
|
|
|
goto doneBlack1d; \
|
|
|
|
|
case S_MakeUpB: \
|
|
|
|
|
case S_MakeUp: \
|
|
|
|
|
a0 += TabEnt->Param; \
|
|
|
|
|
RunLength += TabEnt->Param; \
|
|
|
|
|
break; \
|
|
|
|
|
default: \
|
|
|
|
|
unexpected("BlackTable", a0); \
|
|
|
|
|
goto done1d; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
doneBlack1d: \
|
|
|
|
|
if (a0 >= lastx) \
|
|
|
|
|
goto done1d; \
|
|
|
|
|
if (*(pa - 1) == 0 && *(pa - 2) == 0) \
|
|
|
|
|
pa -= 2; \
|
|
|
|
|
} \
|
|
|
|
|
eof1d: \
|
|
|
|
|
prematureEOF(a0); \
|
|
|
|
|
CLEANUP_RUNS(); \
|
|
|
|
|
goto eoflab; \
|
|
|
|
|
done1d: \
|
|
|
|
|
CLEANUP_RUNS(); \
|
|
|
|
|
} while (0)
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Update the value of b1 using the array
|
|
|
|
|
* of runs for the reference line.
|
|
|
|
|
*/
|
|
|
|
|
#define CHECK_b1 \
|
|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
if (pa != thisrun) \
|
|
|
|
|
while (b1 <= a0 && b1 < lastx) \
|
|
|
|
|
{ \
|
|
|
|
|
if (pb + 1 >= sp->refruns + sp->nruns) \
|
|
|
|
|
{ \
|
|
|
|
|
TIFFErrorExtR( \
|
|
|
|
|
tif, module, "Buffer overflow at line %u of %s %u", \
|
|
|
|
|
sp->line, isTiled(tif) ? "tile" : "strip", \
|
|
|
|
|
isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip); \
|
|
|
|
|
return (-1); \
|
|
|
|
|
} \
|
|
|
|
|
b1 += pb[0] + pb[1]; \
|
|
|
|
|
pb += 2; \
|
|
|
|
|
} \
|
|
|
|
|
} while (0)
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Expand a row of 2D-encoded data.
|
|
|
|
|
*/
|
|
|
|
|
#define EXPAND2D(eoflab) \
|
|
|
|
|
do \
|
|
|
|
|
{ \
|
|
|
|
|
while (a0 < lastx) \
|
|
|
|
|
{ \
|
|
|
|
|
if (pa >= thisrun + sp->nruns) \
|
|
|
|
|
{ \
|
|
|
|
|
TIFFErrorExtR( \
|
|
|
|
|
tif, module, "Buffer overflow at line %u of %s %u", \
|
|
|
|
|
sp->line, isTiled(tif) ? "tile" : "strip", \
|
|
|
|
|
isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip); \
|
|
|
|
|
return (-1); \
|
|
|
|
|
} \
|
|
|
|
|
LOOKUP8(7, TIFFFaxMainTable, eof2d); \
|
|
|
|
|
switch (TabEnt->State) \
|
|
|
|
|
{ \
|
|
|
|
|
case S_Pass: \
|
|
|
|
|
CHECK_b1; \
|
|
|
|
|
if (pb + 1 >= sp->refruns + sp->nruns) \
|
|
|
|
|
{ \
|
|
|
|
|
TIFFErrorExtR(tif, module, \
|
|
|
|
|
"Buffer overflow at line %u of %s %u", \
|
|
|
|
|
sp->line, \
|
|
|
|
|
isTiled(tif) ? "tile" : "strip", \
|
|
|
|
|
isTiled(tif) ? tif->tif_curtile \
|
|
|
|
|
: tif->tif_curstrip); \
|
|
|
|
|
return (-1); \
|
|
|
|
|
} \
|
|
|
|
|
b1 += *pb++; \
|
|
|
|
|
RunLength += b1 - a0; \
|
|
|
|
|
a0 = b1; \
|
|
|
|
|
b1 += *pb++; \
|
|
|
|
|
break; \
|
|
|
|
|
case S_Horiz: \
|
|
|
|
|
if ((pa - thisrun) & 1) \
|
|
|
|
|
{ \
|
|
|
|
|
for (;;) \
|
|
|
|
|
{ /* black first */ \
|
|
|
|
|
LOOKUP16(13, TIFFFaxBlackTable, eof2d); \
|
|
|
|
|
switch (TabEnt->State) \
|
|
|
|
|
{ \
|
|
|
|
|
case S_TermB: \
|
|
|
|
|
SETVALUE(TabEnt->Param); \
|
|
|
|
|
goto doneWhite2da; \
|
|
|
|
|
case S_MakeUpB: \
|
|
|
|
|
case S_MakeUp: \
|
|
|
|
|
a0 += TabEnt->Param; \
|
|
|
|
|
RunLength += TabEnt->Param; \
|
|
|
|
|
break; \
|
|
|
|
|
default: \
|
|
|
|
|
goto badBlack2d; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
doneWhite2da:; \
|
|
|
|
|
for (;;) \
|
|
|
|
|
{ /* then white */ \
|
|
|
|
|
LOOKUP16(12, TIFFFaxWhiteTable, eof2d); \
|
|
|
|
|
switch (TabEnt->State) \
|
|
|
|
|
{ \
|
|
|
|
|
case S_TermW: \
|
|
|
|
|
SETVALUE(TabEnt->Param); \
|
|
|
|
|
goto doneBlack2da; \
|
|
|
|
|
case S_MakeUpW: \
|
|
|
|
|
case S_MakeUp: \
|
|
|
|
|
a0 += TabEnt->Param; \
|
|
|
|
|
RunLength += TabEnt->Param; \
|
|
|
|
|
break; \
|
|
|
|
|
default: \
|
|
|
|
|
goto badWhite2d; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
doneBlack2da:; \
|
|
|
|
|
} \
|
|
|
|
|
else \
|
|
|
|
|
{ \
|
|
|
|
|
for (;;) \
|
|
|
|
|
{ /* white first */ \
|
|
|
|
|
LOOKUP16(12, TIFFFaxWhiteTable, eof2d); \
|
|
|
|
|
switch (TabEnt->State) \
|
|
|
|
|
{ \
|
|
|
|
|
case S_TermW: \
|
|
|
|
|
SETVALUE(TabEnt->Param); \
|
|
|
|
|
goto doneWhite2db; \
|
|
|
|
|
case S_MakeUpW: \
|
|
|
|
|
case S_MakeUp: \
|
|
|
|
|
a0 += TabEnt->Param; \
|
|
|
|
|
RunLength += TabEnt->Param; \
|
|
|
|
|
break; \
|
|
|
|
|
default: \
|
|
|
|
|
goto badWhite2d; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
doneWhite2db:; \
|
|
|
|
|
for (;;) \
|
|
|
|
|
{ /* then black */ \
|
|
|
|
|
LOOKUP16(13, TIFFFaxBlackTable, eof2d); \
|
|
|
|
|
switch (TabEnt->State) \
|
|
|
|
|
{ \
|
|
|
|
|
case S_TermB: \
|
|
|
|
|
SETVALUE(TabEnt->Param); \
|
|
|
|
|
goto doneBlack2db; \
|
|
|
|
|
case S_MakeUpB: \
|
|
|
|
|
case S_MakeUp: \
|
|
|
|
|
a0 += TabEnt->Param; \
|
|
|
|
|
RunLength += TabEnt->Param; \
|
|
|
|
|
break; \
|
|
|
|
|
default: \
|
|
|
|
|
goto badBlack2d; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
doneBlack2db:; \
|
|
|
|
|
} \
|
|
|
|
|
CHECK_b1; \
|
|
|
|
|
break; \
|
|
|
|
|
case S_V0: \
|
|
|
|
|
CHECK_b1; \
|
|
|
|
|
SETVALUE(b1 - a0); \
|
|
|
|
|
if (pb >= sp->refruns + sp->nruns) \
|
|
|
|
|
{ \
|
|
|
|
|
TIFFErrorExtR(tif, module, \
|
|
|
|
|
"Buffer overflow at line %u of %s %u", \
|
|
|
|
|
sp->line, \
|
|
|
|
|
isTiled(tif) ? "tile" : "strip", \
|
|
|
|
|
isTiled(tif) ? tif->tif_curtile \
|
|
|
|
|
: tif->tif_curstrip); \
|
|
|
|
|
return (-1); \
|
|
|
|
|
} \
|
|
|
|
|
b1 += *pb++; \
|
|
|
|
|
break; \
|
|
|
|
|
case S_VR: \
|
|
|
|
|
CHECK_b1; \
|
|
|
|
|
SETVALUE(b1 - a0 + TabEnt->Param); \
|
|
|
|
|
if (pb >= sp->refruns + sp->nruns) \
|
|
|
|
|
{ \
|
|
|
|
|
TIFFErrorExtR(tif, module, \
|
|
|
|
|
"Buffer overflow at line %u of %s %u", \
|
|
|
|
|
sp->line, \
|
|
|
|
|
isTiled(tif) ? "tile" : "strip", \
|
|
|
|
|
isTiled(tif) ? tif->tif_curtile \
|
|
|
|
|
: tif->tif_curstrip); \
|
|
|
|
|
return (-1); \
|
|
|
|
|
} \
|
|
|
|
|
b1 += *pb++; \
|
|
|
|
|
break; \
|
|
|
|
|
case S_VL: \
|
|
|
|
|
CHECK_b1; \
|
|
|
|
|
if (b1 < (int)(a0 + TabEnt->Param)) \
|
|
|
|
|
{ \
|
|
|
|
|
unexpected("VL", a0); \
|
|
|
|
|
goto eol2d; \
|
|
|
|
|
} \
|
|
|
|
|
SETVALUE(b1 - a0 - TabEnt->Param); \
|
|
|
|
|
b1 -= *--pb; \
|
|
|
|
|
break; \
|
|
|
|
|
case S_Ext: \
|
|
|
|
|
*pa++ = lastx - a0; \
|
|
|
|
|
extension(a0); \
|
|
|
|
|
goto eol2d; \
|
|
|
|
|
case S_EOL: \
|
|
|
|
|
*pa++ = lastx - a0; \
|
|
|
|
|
NeedBits8(4, eof2d); \
|
|
|
|
|
if (GetBits(4)) \
|
|
|
|
|
unexpected("EOL", a0); \
|
|
|
|
|
ClrBits(4); \
|
|
|
|
|
EOLcnt = 1; \
|
|
|
|
|
goto eol2d; \
|
|
|
|
|
default: \
|
|
|
|
|
badMain2d: \
|
|
|
|
|
unexpected("MainTable", a0); \
|
|
|
|
|
goto eol2d; \
|
|
|
|
|
badBlack2d: \
|
|
|
|
|
unexpected("BlackTable", a0); \
|
|
|
|
|
goto eol2d; \
|
|
|
|
|
badWhite2d: \
|
|
|
|
|
unexpected("WhiteTable", a0); \
|
|
|
|
|
goto eol2d; \
|
|
|
|
|
eof2d: \
|
|
|
|
|
prematureEOF(a0); \
|
|
|
|
|
CLEANUP_RUNS(); \
|
|
|
|
|
goto eoflab; \
|
|
|
|
|
} \
|
|
|
|
|
} \
|
|
|
|
|
if (RunLength) \
|
|
|
|
|
{ \
|
|
|
|
|
if (RunLength + a0 < lastx) \
|
|
|
|
|
{ \
|
|
|
|
|
/* expect a final V0 */ \
|
|
|
|
|
NeedBits8(1, eof2d); \
|
|
|
|
|
if (!GetBits(1)) \
|
|
|
|
|
goto badMain2d; \
|
|
|
|
|
ClrBits(1); \
|
|
|
|
|
} \
|
|
|
|
|
SETVALUE(0); \
|
|
|
|
|
} \
|
|
|
|
|
eol2d: \
|
|
|
|
|
CLEANUP_RUNS(); \
|
|
|
|
|
} while (0)
|
|
|
|
|
#endif /* _FAX3_ */
|
