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// sfftobmp.cpp
//
// This file is part of sffview, a program to view
// structured fax files (sff).
// Copyright (C) 2000 Peter Schaefer
//
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose and without fee is hereby granted, provided
// that the above copyright notice appear in all copies. This software
// is provided "as is" without express or implied warranty.
//
// You can contact the author by email at peter.schaefer@gmx.de.
//
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif
#if wxUSE_STREAMS
#include "wx/wfstream.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>
#ifdef __WXMSW__
#include <strstrea.h>
#else
#include <sstream>
#endif
#include "inc/sfftobmp.h"
/*-RCS-Info----------------------------------------------------
$Id: sfftobmp.cpp,v 1.6 1999/12/19 07:47:26 peter Exp peter $
---RCS-Info--------------------------------------------------*/
/*
Auszug aus CCITT Draft Recommendation T.4:
Table 1a. Terminating White Codes Table 1b. Make Up White Codes
Code Lng Run Code Lng Run
--------------------------- ---------------------------
00110101 8 0 11011 5 64
000111 6 1 10010 5 128
0111 4 2 010111 6 192
1000 4 3 0110111 7 256
1011 4 4 00110110 8 320
1100 4 5 00110111 8 384
1110 4 6 01100100 8 448
1111 4 7 01100101 8 512
10011 5 8 01101000 8 576
10100 5 9 01100111 8 640
00111 5 10 011001100 9 704
01000 5 11 011001101 9 768
001000 6 12 011010010 9 832
000011 6 13 011010011 9 896
110100 6 14 011010100 9 960
110101 6 15 011010101 9 1024
101010 6 16 011010110 9 1088
101011 6 17 011010111 9 1152
0100111 7 18 011011000 9 1216
0001100 7 19 011011001 9 1280
0001000 7 20 011011010 9 1344
0010111 7 21 011011011 9 1408
0000011 7 22 010011000 9 1472
0000100 7 23 010011001 9 1536
0101000 7 24 010011010 9 1600
0101011 7 25 011000 6 1664
0010011 7 26 010011011 9 1728
0100100 7 27
0011000 7 28
00000010 8 29
00000011 8 30
00011010 8 31
00011011 8 32
00010010 8 33
00010011 8 34
00010100 8 35
00010101 8 36
00010110 8 37
00010111 8 38
00101000 8 39
00101001 8 40
00101010 8 41
00101011 8 42
00101100 8 43
00101101 8 44
00000100 8 45
00000101 8 46
00001010 8 47
00001011 8 48
01010010 8 49
01010011 8 50
01010100 8 51
01010101 8 52
00100100 8 53
00100101 8 54
01011000 8 55
01011001 8 56
01011010 8 57
01011011 8 58
01001010 8 59
01001011 8 60
00110010 8 61
00110011 8 62
00110100 8 63
Table 2a. Terminating Black Codes Table 2b. Make Up Black Codes
Code Lng Run Code Lng Run
--------------------------- ---------------------------
0000110111 10 0 0000001111 10 64
010 3 1 000011001000 12 128
11 2 2 000011001001 12 192
10 2 3 000001011011 12 256
011 3 4 000000110011 12 320
0011 4 5 000000110100 12 384
0010 4 6 000000110101 12 448
00011 5 7 0000001101100 13 512
000101 6 8 0000001101101 13 576
000100 6 9 0000001001010 13 640
0000100 7 10 0000001001011 13 704
0000101 7 11 0000001001100 13 768
0000111 7 12 0000001001101 13 832
00000100 8 13 0000001110010 13 896
00000111 8 14 0000001110011 13 960
000011000 9 15 0000001110100 13 1024
0000010111 10 16 0000001110101 13 1088
0000011000 10 17 0000001110110 13 1152
0000001000 10 18 0000001110111 13 1216
00001100111 11 19 0000001010010 13 1280
00001101000 11 20 0000001010011 13 1344
00001101100 11 21 0000001010100 13 1408
00000110111 11 22 0000001010101 13 1472
00000101000 11 23 0000001011010 13 1536
00000010111 11 24 0000001011011 13 1600
00000011000 11 25 0000001100100 13 1664
000011001010 12 26 0000001100101 13 1728
000011001011 12 27
000011001100 12 28
000011001101 12 29
000001101000 12 30
000001101001 12 31
000001101010 12 32
000001101011 12 33
000011010010 12 34
000011010011 12 35
000011010100 12 36
000011010101 12 37
000011010110 12 38
000011010111 12 39
000001101100 12 40
000001101101 12 41
000011011010 12 42
000011011011 12 43
000001010100 12 44
000001010101 12 45
000001010110 12 46
000001010111 12 47
000001100100 12 48
000001100101 12 49
000001010010 12 50
000001010011 12 51
000000100100 12 52
000000110111 12 53
000000111000 12 54
000000100111 12 55
000000101000 12 56
000001011000 12 57
000001011001 12 58
000000101011 12 59
000000101100 12 60
000001011010 12 61
000001100110 12 62
000001100111 12 63
Note: It is recognized that machines exist which accommodate
larger paper widths whilst maintaining the standard
horizontal resolution. This option has been provided for by
the addition of the Make Up Code Set defined as follows:
Table 3. Extended Make Up Codes (Black and White)
Code Lng Run
---------------------------
00000001000 11 1792
00000001100 11 1856
00000001101 11 1920
000000010010 12 1984
000000010011 12 2048
000000010100 12 2112
000000010101 12 2176
000000010110 12 2240
000000010111 12 2304
000000011100 12 2368
000000011101 12 2432
000000011110 12 2496
000000011111 12 2560
*/
//-Codetabellen----------------------------------------------------
#include "inc/codes.inc"
//-Constants-------------------------------------------------------
wxUint8 CSffFile::m_SFFID[4] = { 0x53, 0x66, 0x66, 0x66 };
//-----------------------------------------------------------------
char * CSimpleException::GetReason()
{
char *pszError;
switch (m_nError) {
case err_invalidfile :
pszError = "Not a valid sff file.";
break;
case err_corruptfile :
pszError = "File seems corrupt. Reading abandoned.";
break;
case err_lastpageread :
pszError = "Last page read.";
break;
case err_notsupported :
pszError = "Operation not supported.";
break;
case err_openfile :
pszError = "Error open file.";
break;
case err_nowhitestart :
pszError = "Line doesn't begin with white code.";
break;
case err_noblackcode :
pszError = "White code not followed by black code.";
break;
case err_noblackterm :
pszError = "Black MUC not followed by black TERM.";
break;
case err_nowhiteterm :
pszError = "White MUC not followed by white TERM.";
break;
case err_invalidversion :
pszError = "OOps. Dont know how to handle this Fileversion.";
break;
case err_unknowncoding :
pszError = "Oh my dear. Dont know how to handle this encoding.";
break;
default :
pszError = "Unknown error.";
break;
}
return pszError;
}
//-----------------------------------------------------------------
void CBitSource::NeedBits(int nCount)
{
while ((m_dwByteCount > 0) && (m_wBitsAvail < nCount)) {
m_dwAccu |= ((*m_pBuffer) << m_wBitsAvail);
m_wBitsAvail += 8;
--m_dwByteCount;
++m_pBuffer;
}
}
void CBitSource::ClrBits(int nCount)
{
m_wBitsAvail -= nCount;
m_dwAccu = (m_dwAccu >> nCount);
}
wxUint16 CBitSource::GetBits(int nCount)
{
return (m_dwAccu & ((1<<(nCount))-1)); // untere x Bits ausmaskieren
};
CBitSource::CBitSource(void *pBuffer, wxUint32 nByteCount) :
m_pBuffer((wxUint8 *)pBuffer),
m_wBitsAvail(0),
m_dwAccu(0),
m_dwByteCount(nByteCount)
{
/* sonst nix */
};
//-----------------------------------------------------------------
void CBitSink::SetBits(int nCount)
{
while ( (m_dwByteCount > 0) && (nCount > 0)) {
++m_wBitsAvail;
if (m_wBitsAvail > 7) {
m_wBitsAvail = 0;
++m_pBuffer; --m_dwByteCount;
}
#ifdef __WXMSW__
*m_pBuffer &= ~(0x80 >> m_wBitsAvail);
#else
*m_pBuffer |= (0x01 << m_wBitsAvail);
#endif
--nCount;
}
};
void CBitSink::ClearBits(int nCount)
{
while ( (m_dwByteCount > 0) && (nCount > 0)) {
++m_wBitsAvail;
if (m_wBitsAvail > 7) {
m_wBitsAvail = 0;
++m_pBuffer; --m_dwByteCount;
}
--nCount;
}
};
CBitSink::CBitSink(void *pBuffer, wxUint32 nByteCount) :
m_pBuffer((wxUint8 *)pBuffer),
m_wBitsAvail(0),
m_dwByteCount(nByteCount)
{
};
//-----------------------------------------------------------------
int CHuffDecoder::FindToken(LPTABENTRY pTable)
{
wxUint16 bits;
while (pTable->code) {
bits = GetBits(pTable->bits);
if (bits == pTable->code) {
ClrBits(pTable->bits);
return pTable->run;
}
pTable++;
}
return -1;
}
int CHuffDecoder::DecodeLine(CBitSink& aBitSink)
{
int iRunlength;
m_dwRunlength = 0;
TDecoderState state = NEED_WHITE;
for (;;) {
switch (state) {
case NEED_WHITE :
// we expect white_term or white_markup
NeedBits(9);
iRunlength = FindToken(aTermWhite);
if ( iRunlength >= 0 ) {
if ( iRunlength > 0 ) {
m_dwRunlength += iRunlength;
aBitSink.ClearBits(iRunlength);
}
state = NEED_BLACK;
} else {
iRunlength = FindToken(aMarkUpWhite);
if (iRunlength >= 0) {
if ( iRunlength > 0 ) {
m_dwRunlength += iRunlength;
aBitSink.ClearBits(iRunlength);
}
state = NEED_WHITETERM;
} else
throw CSimpleException(CSimpleException::err_nowhitestart);
}
break;
case NEED_BLACK :
// we expect black_term or black_markup
NeedBits(13);
if ((iRunlength = FindToken(aTermBlack)) >= 0) {
if ( iRunlength > 0 ) {
m_dwRunlength += iRunlength;
aBitSink.SetBits(iRunlength);
}
state = NEED_WHITE;
} else if ((iRunlength = FindToken(aMarkUpBlack)) >= 0) {
if ( iRunlength > 0 ) {
m_dwRunlength += iRunlength;
aBitSink.SetBits(iRunlength);
}
state = NEED_BLACKTERM;
} else
throw CSimpleException(CSimpleException::err_noblackcode);
break;
case NEED_WHITETERM :
// expect White_Term only
NeedBits(8);
if ((iRunlength = FindToken(aTermWhite)) >= 0) {
if ( iRunlength > 0 ) {
aBitSink.ClearBits(iRunlength);
m_dwRunlength += iRunlength;
}
state = NEED_BLACK;
} else
throw CSimpleException(CSimpleException::err_nowhiteterm);
break;
case NEED_BLACKTERM :
// expect Black_Term only
NeedBits(12);
if ((iRunlength = FindToken(aTermBlack)) >= 0) {
if ( iRunlength > 0 ) {
m_dwRunlength += iRunlength;
aBitSink.SetBits(iRunlength);
}
state = NEED_WHITE;
} else
throw CSimpleException(CSimpleException::err_noblackterm);
break;
}
if (m_dwByteCount <= 0)
break;
}
return m_dwRunlength;
}
//-----------------------------------------------------------------
CSffFile::CSffFile(const wxString& strFileName) :
m_stream(strFileName),
m_nPageCount(0)
{
::memset(m_acPages,0,sizeof(m_acPages));
ScanFile();
}
CSffFile::~CSffFile()
{
for (int i = 0; i <= m_nPageCount; ++i) {
if (m_acPages[i])
delete m_acPages[i];
}
}
bool CSffFile::DecodeRecord(TSFFRecord& rec, wxUint8 *pBuf, wxUint32 cbBuf)
{
bool rc;
if (rec.type != NORMAL)
return FALSE;
#ifdef __WXMSW__
::memset(pBuf, 0xFF, cbBuf); // Puffer auf Weiss setzen
#else
::memset(pBuf, 0x0, cbBuf); // Puffer auf Weiss setzen
#endif
CHuffDecoder source(rec.pData, rec.cb);
CBitSink sink(pBuf, cbBuf);
try {
rec.runlength = source.DecodeLine(sink);
rc = TRUE;
}
catch(CSimpleException)
{
rc = FALSE;
}
return rc;
}
bool CSffFile::GetRecord(TSFFRecord& rec)
{
wxUint8 b1, b2;
wxUint16 w;
bool result;
b1 = m_stream.GetC(); // Recordtyp einlesen
if (b1 == 0) {
// variable Anzahl Bytes folgt
b1 = m_stream.GetC(); // LSB
b2 = m_stream.GetC(); // MSB
w = ((b2 << 8) | b1);
rec.type = NORMAL;
rec.cb = w;
rec.pData = (wxUint8 *)malloc(w);
m_stream.Read(rec.pData, w);
result = TRUE;
} else if (b1 < 217) {
// normale Anzahl wxUint8s folgt
rec.type = NORMAL;
rec.cb = b1;
rec.pData = (wxUint8 *)malloc(b1);
m_stream.Read(rec.pData, b1);
result = TRUE;
} else if (b1 < 254) {
// Whiteskip
rec.type = WHITESKIP;
rec.cb = (b1 - 216);
rec.pData = 0;
result = TRUE;
} else if (b1 < 255) {
// 254 -> Pageheader
result = FALSE;
} else {
// Fehlerhafte Zeile oder Benutzerinfo
b1 = m_stream.GetC(); // LSB
if (b1 == 0) {
rec.type = BADLINE;
rec.cb = 1;
rec.pData = 0;
} else {
rec.type = USERINFO;
rec.cb = b1;
rec.pData = (wxUint8 *)malloc(b1);
m_stream.Read(rec.pData, b1);
}
result = TRUE;
}
return result;
}
bool CSffFile::SeekPage(int nPage)
{
--nPage;
if ((nPage < 0)||(nPage >= m_nPageCount)||(nPage>=_SIZE_PAGEBUFFER))
return FALSE;
if (!m_acPages[nPage])
return FALSE;
m_stream.SeekI(m_acPages[nPage]->filepos, wxFromStart);
return TRUE;
}
void CSffFile::ScanFile()
{
TSFFFileHeader dh;
TSFFPageHeader ph;
wxUint8 b1 = 0,b2 = 0;
wxUint16 w;
int nLineCount = 0;
if (m_stream.LastError() != wxStream_NOERROR)
return;
m_nPageCount = 0;
TScannerState state = NEED_MAGIC;
do {
switch (state) {
case NEED_MAGIC :
m_stream.Read(&dh, sizeof(dh));
if (m_stream.LastError() != wxStream_NOERROR)
throw CSimpleException(CSimpleException::err_invalidfile);
if (::memcmp(&dh.sff_id, &m_SFFID, sizeof(m_SFFID)) != 0)
throw CSimpleException(CSimpleException::err_invalidfile);
if (dh.version > 1)
throw CSimpleException(CSimpleException::err_invalidversion);
m_stream.SeekI(dh.first_page, wxFromStart);
state = NEED_PAGESTART;
break;
case NEED_PAGESTART :
b1 = m_stream.GetC(); // Recordheader (0xFE fuer Seitenanfang)
if (b1 != 0xFE)
throw CSimpleException(CSimpleException::err_corruptfile);
b1 = m_stream.GetC(); // Recordlaenge (normalerweise 0x10)
if (b1 == 0)
state = LAST_PAGE;
else
state = NEED_PAGEHEADER;
break;
case NEED_PAGEHEADER :
m_stream.Read(&ph, sizeof(TSFFPageHeader));
if (m_stream.LastError() != wxStream_NOERROR)
throw CSimpleException(CSimpleException::err_corruptfile);
if (ph.coding > 0)
throw CSimpleException(CSimpleException::err_unknowncoding);
m_stream.SeekI(b1 - sizeof(TSFFPageHeader), wxFromCurrent); // user data ueberspringen
m_acPages[m_nPageCount] = new TSFFPage;
m_acPages[m_nPageCount]->filepos = m_stream.TellI();
m_acPages[m_nPageCount]->width = ph.linelen;
m_acPages[m_nPageCount]->height = ph.pagelen;
state = NEED_RECORD;
nLineCount = 0;
break;
case NEED_RECORD :
b1 = m_stream.GetC(); // Recordtyp einlesen
if (b1 == 0) {
// variable Anzahl Bytes folgt
b1 = m_stream.GetC(); // LSB
b2 = m_stream.GetC(); // MSB
w = ((b2 << 8) | b1);
m_stream.SeekI(w, wxFromCurrent); // Daten berspringen
++nLineCount;
} else if (b1 < 217) {
// normale Anzahl Bytes folgt
m_stream.SeekI((long)b1, wxFromCurrent); // Daten berspringen
++nLineCount;
} else if (b1 < 254) {
// Whiteskip
nLineCount+=(b1 - 216);
} else if (b1 < 255) {
// 254 -> Pageheader
m_acPages[m_nPageCount]->height = nLineCount;
nLineCount = 0;
++m_nPageCount;
b1 = m_stream.GetC(); // Recordlaenge (normalerweise 0x10)
if (b1 == 0) {
state = LAST_PAGE;
} else {
state = NEED_PAGEHEADER;
}
} else {
// Fehlerhafte Zeile oder Benutzerinfo
b1 = m_stream.GetC(); // LSB
if (b1 == 0) {
++nLineCount;
} else {
m_stream.SeekI(b1, wxFromCurrent); // Benutzerinfo berspringen
}
}
break;
case LAST_PAGE :
break;
}
} while(state != LAST_PAGE);
return;
}
wxUint32 CSffFile::GetPageHeight(int nPage)
{
--nPage;
if ((nPage < 0)||(nPage >= m_nPageCount)||(nPage>=_SIZE_PAGEBUFFER))
return 0;
if (!m_acPages[nPage])
return 0;
return m_acPages[nPage]->height;
}
wxUint32 CSffFile::GetPageWidth(int nPage)
{
--nPage;
if ((nPage < 0)||(nPage >= m_nPageCount)||(nPage>=_SIZE_PAGEBUFFER))
return 0;
if (!m_acPages[nPage])
return 0;
return m_acPages[nPage]->width;
}
|
