forked from madsen/vbindiff
-
Notifications
You must be signed in to change notification settings - Fork 2
/
Copy pathvbindiff.cpp
1997 lines (1673 loc) · 55.1 KB
/
vbindiff.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//--------------------------------------------------------------------
//
// Visual Binary Diff
// Copyright 1995-2008 by Christopher J. Madsen
//
// Visual display of differences in binary files
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//--------------------------------------------------------------------
#include "config.h"
#pragma warning(push)
#pragma warning(disable:4365)
#include <ctype.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include <iostream>
#include <sstream>
#include <map>
#include <string>
#include <vector>
#pragma warning(pop)
using namespace std;
#include "GetOpt/GetOpt.hpp"
#include "ConWin.hpp"
#include "FileIO.hpp"
const char titleString[] =
"\nVBinDiff " PACKAGE_VERSION "\nCopyright 1995-2008 Christopher J. Madsen";
void exitMsg(int status, const char* message);
void usage(bool showHelp=true, int exitStatus=0);
//====================================================================
// Type definitions:
typedef unsigned char Byte;
typedef unsigned short Word;
typedef Byte Command;
enum LockState { lockNeither = 0, lockTop, lockBottom };
//--------------------------------------------------------------------
// Strings:
typedef string String;
typedef String::size_type StrIdx;
typedef String::iterator StrItr;
typedef String::const_iterator StrConstItr;
//--------------------------------------------------------------------
// Vectors:
typedef vector<String> StrVec;
typedef StrVec::iterator SVItr;
typedef StrVec::const_iterator SVConstItr;
typedef StrVec::size_type VecSize;
//--------------------------------------------------------------------
// Map:
typedef map<VecSize, String> StrMap;
typedef StrMap::value_type SMVal;
typedef StrMap::iterator SMItr;
typedef StrMap::const_iterator SMConstItr;
//====================================================================
// Constants:
const Command cmmMove = 0x80;
const Command cmmMoveSize = 0x03;
const Command cmmMoveForward = 0x04;
const Command cmmMoveTop = 0x08;
const Command cmmMoveBottom = 0x10;
const Command cmmMoveByte = 0x00; // Move 1 byte
const Command cmmMoveLine = 0x01; // Move 1 line
const Command cmmMovePage = 0x02; // Move 1 page
const Command cmmMoveAll = 0x03; // Move to beginning or end
const Command cmmMoveBoth = cmmMoveTop|cmmMoveBottom;
const Command cmgGoto = 0x04; // Commands 4-7
const Command cmgGotoTop = 0x01;
const Command cmgGotoBottom = 0x02;
const Command cmgGotoBoth = cmgGotoTop|cmgGotoBottom;
const Command cmgGotoMask = static_cast<Command>(~cmgGotoBoth);
const Command cmfFind = 0x40; // Commands 64-67
const Command cmfFindNext = 0x10;
const Command cmfFindPrev = 0x20;
const Command cmNothing = 0;
const Command cmNextDiff = 1;
const Command cmQuit = 2;
const Command cmEditTop = 8;
const Command cmEditBottom = 9;
const Command cmUseTop = 10;
const Command cmUseBottom = 11;
const Command cmToggleASCII = 12;
const short leftMar = 13; // Starting column of hex display
// display 3 x 8 Byte
const short lineWidth_3 = 24;
const short screenWidth_3 = 114;
const short leftMar2_3 = 88;
// display 4 x 8 Byte
const short lineWidth_4 = 32;
const short screenWidth_4 = 148;
const short leftMar2_4 = 113;
// display 2 x 8 Byte
const short lineWidth_2 = 16; // Number of bytes displayed per line
const short screenWidth_2 = 80; // Key value - but _must_ be constant!
const short leftMar2_2 = 63; // Starting column of ASCII display
const short screenWidth_max = screenWidth_4;
const short screenWidth_min = screenWidth_2;
short lineWidth = lineWidth_4;
short screenWidth = screenWidth_4;
short leftMar2 = leftMar2_4;
const short promptHeight = 4; // Height of prompt window
const short inWidth = 10; // Width of input window (excluding border)
const int maxPath = 260;
const VecSize maxHistory = 2000;
const char hexDigits[] = "0123456789ABCDEF";
#include "tables.h" // ASCII and EBCDIC tables
//====================================================================
// Class Declarations:
void showEditPrompt();
void showPrompt();
class Difference;
class FileDisplay
{
friend class Difference;
protected:
Size bufContents;
Byte* data;
const Difference* diffs;
File file;
char fileName[maxPath];
FPos offset;
ConWindow win;
bool writable;
short yPos;
size_t search;
public:
FileDisplay();
~FileDisplay();
void init(short y, const Difference* aDiff);
void resize();
void shutDown();
void display();
bool edit(const FileDisplay* other);
const Byte* getBuffer() const { return data; };
void move(FPos step) { moveTo(offset + step); };
void moveTo(FPos newOffset);
bool moveTo(const Byte* searchFor, size_t searchLen);
bool moveToBack(const Byte* searchFor, size_t searchLen);
void moveToEnd(FileDisplay* other);
bool setFile(const char* aFileName);
FPos filesize;
protected:
void setByte(short x, short y, Byte b);
}; // end FileDisplay
class Difference
{
friend void FileDisplay::display();
protected:
Byte* data;
const FileDisplay* file1;
const FileDisplay* file2;
int numDiffs;
public:
Difference(const FileDisplay* aFile1, const FileDisplay* aFile2);
~Difference();
int compute();
int getNumDiffs() const { return numDiffs; };
void resize();
}; // end Difference
class InputManager
{
private:
char* buf; // The editing buffer
const char* restrict; // If non-NULL, only allow these chars
StrVec& history; // The history vector to use
StrMap historyOverlay; // Overlay of modified history entries
VecSize historyPos; // The current offset into history[]
size_t maxLen; // The size of buf (not including NUL)
size_t len; // The current length of the string
size_t i; // The current cursor position
bool upcase; // Force all characters to uppercase?
bool splitHex; // Entering space-separated hex bytes?
bool insert; // False for overstrike mode
InputManager& operator = (const InputManager& t) = delete;
public:
InputManager(char* aBuf, size_t aMaxLen, StrVec& aHistory);
bool run();
void setCharacters(const char* aRestriction) { restrict = aRestriction; };
void setSplitHex(bool val) { splitHex = val; };
void setUpcase(bool val) { upcase = val; };
private:
bool normalize(size_t pos);
void useHistory(int delta);
}; // end InputManager
//====================================================================
// Global Variables:
String lastSearch;
StrVec hexSearchHistory, textSearchHistory, positionHistory;
ConWindow promptWin,inWin;
FileDisplay file1, file2;
Difference diffs(&file1, &file2);
const char* displayTable = asciiDisplayTable;
const char* program_name; // Name under which this program was invoked
LockState lockState = lockNeither;
bool singleFile = false;
short numLines = 9; // Number of lines of each file to display
Size bufSize = static_cast<Size>(numLines * lineWidth);
short linesBetween = 1; // Number of lines of padding between files
// The number of bytes to move for each possible step size:
// See cmmMoveByte, cmmMoveLine, cmmMovePage
Size steps[4] = {1, static_cast<Size>(lineWidth), bufSize-lineWidth, 0};
//====================================================================
// Miscellaneous Functions:
//--------------------------------------------------------------------
// Beep the speaker:
#ifdef WIN32_CONSOLE // beep() is defined by ncurses
void beep()
{
MessageBeep(0xFFFFFFFFUL);
} // end beep
#endif // WIN32_CONSOLE
//--------------------------------------------------------------------
// Convert a character to uppercase:
//
// The standard toupper(c) isn't guaranteed for arbitrary integers.
int safeUC(int c)
{
return (c >= 0 && c <= UCHAR_MAX) ? toupper(c) : c;
} // end safeUC
//====================================================================
// Class Difference:
//
// Member Variables:
// file1, file2:
// The FileDisplay objects being compared
// numDiffs:
// The number of differences between the two FileDisplay buffers
// line/table:
// An array of bools for each byte in the FileDisplay buffers
// True marks differences
//
//--------------------------------------------------------------------
// Constructor:
//
// Input:
// aFile1, aFile2:
// Pointers to the FileDisplay objects to compare
Difference::Difference(const FileDisplay* aFile1, const FileDisplay* aFile2)
: data(NULL),
file1(aFile1),
file2(aFile2)
{
} // end Difference::Difference
//--------------------------------------------------------------------
Difference::~Difference()
{
delete [] reinterpret_cast<Byte*>(data);
} // end Difference::~Difference
//--------------------------------------------------------------------
// Compute differences:
//
// Input Variables:
// file1, file2: The files to compare
//
// Returns:
// The number of differences between the buffers
// -1 if both buffers are empty
//
// Output Variables:
// numDiffs: The number of differences between the buffers
int Difference::compute()
{
if (singleFile)
// We return 1 so that cmNextDiff won't keep searching:
return (file1->bufContents ? 1 : -1);
memset(data, 0, bufSize); // Clear the difference table
int different = 0;
const Byte* buf1 = file1->data;
const Byte* buf2 = file2->data;
Size size = min(file1->bufContents, file2->bufContents);
Size i;
for (i = 0; i < size; i++)
if (*(buf1++) != *(buf2++)) {
data[i] = true;
++different;
}
size = max(file1->bufContents, file2->bufContents);
if (i < size) {
// One buffer has more data than the other:
different += size - i;
for (; i < size; i++)
data[i] = true; // These bytes are only in 1 buffer
} else if (!size)
return -1; // Both buffers are empty
numDiffs = different;
return different;
} // end Difference::compute
//--------------------------------------------------------------------
void Difference::resize()
{
if (singleFile) return;
if (data)
delete [] data;
data = new Byte[bufSize];
} // end Difference::resize
//====================================================================
// Class FileDisplay:
//
// Member Variables:
// bufContents:
// The number of bytes in the file buffer
// diffs:
// A pointer to the Difference object related to this file
// file:
// The file being displayed
// fileName:
// The relative pathname of the file being displayed
// offset:
// The position in the file of the first byte in the buffer
// win:
// The handle of the window used for display
// yPos:
// The vertical position of the display window
// search:
// The number of bytes to highlight
// buffer/line:
// The currently displayed portion of the file
//
//--------------------------------------------------------------------
// Constructor:
FileDisplay::FileDisplay()
: bufContents(0),
data(NULL),
diffs(NULL),
offset(0),
writable(false),
yPos(0),
search(0)
{
fileName[0] = '\0';
} // end FileDisplay::FileDisplay
//--------------------------------------------------------------------
// Initialize:
//
// Creates the display window and opens the file.
//
// Input:
// y: The vertical position of the display window
// aDiff: The Difference object related to this buffer
void FileDisplay::init(short y, const Difference* aDiff)
{
diffs = aDiff;
yPos = y;
win.init(0, y, screenWidth, (numLines + 1 + (y ? 0 : linesBetween)), cFileWin);
resize();
} // end FileDisplay::init
//--------------------------------------------------------------------
// Destructor:
FileDisplay::~FileDisplay()
{
shutDown();
CloseFile(file);
delete [] reinterpret_cast<Byte*>(data);
} // end FileDisplay::~FileDisplay
//--------------------------------------------------------------------
void FileDisplay::resize()
{
if (data)
delete [] data;
data = new Byte[bufSize];
// FIXME resize window
} // end FileDisplay::resize
//--------------------------------------------------------------------
// Shut down the file display:
//
// Deletes the display window.
void FileDisplay::shutDown()
{
win.close();
} // end FileDisplay::shutDown
//--------------------------------------------------------------------
// Display the file contents:
void FileDisplay::display()
{
if (! fileName[0]) return;
short row, col, idx, lineLength;
FPos lineOffset = offset;
char bufHex[1024] = { 0 };
char bufAsc[1024] = { 0 };
const size_t bufHexSize = static_cast<size_t>(screenWidth + 1);
const size_t bufAscSize = static_cast<size_t>(lineWidth + lineWidth / 8);
for (row=0; row < numLines; ++row) {
memset(bufAsc, ' ', bufAscSize - 1);
size_t bufHexLen = 0;
Size posEndOfRowInBuffer = static_cast<Size>(row) * static_cast<Size>(lineWidth);
if (posEndOfRowInBuffer > bufContents)
lineLength = 0;
else
lineLength = static_cast<short>(min(static_cast<Size>(lineWidth), bufContents - posEndOfRowInBuffer));
if (lineLength) {
snprintf(bufHex + bufHexLen, bufHexSize - bufHexLen,
"%01X%04X %04X: ",
Word(lineOffset >> 32),
Word(lineOffset >> 16),
Word(lineOffset & 0xFFFF));
bufHexLen += strlen(bufHex + bufHexLen);
}
for (col=0, idx = -1; col < lineLength; ++col) {
bool addSpace = false;
if (! (col % 8)) { addSpace = true; ++idx; }
snprintf(bufHex + bufHexLen, bufHexSize - bufHexLen,
"%s%02X ",
addSpace ? " ": "",
data[row * lineWidth + col]);
bufHexLen += strlen(bufHex + bufHexLen);
bufAsc[idx++] = displayTable[data[row * lineWidth + col]];
}
memset(bufHex + bufHexLen, ' ', bufHexSize - bufHexLen);
bufHex[bufHexSize - 1] = 0;
win.put(0, row + 1, bufHex);
win.put(leftMar2, row + 1, bufAsc);
if (diffs)
for (col=0; col < lineWidth; ++col)
if (diffs->data[row * lineWidth + col]) {
win.putAttribs(leftMar + col * 3 + (col / 8), row + 1, cFileDiff, 2);
win.putAttribs(leftMar2 + col + (col / 8), row + 1, cFileDiff, 1);
}
if (search)
for (col=0; col < lineWidth && search; ++col, --search) {
win.putAttribs(leftMar + col * 3 + (col / 8), row + 1, cFileSearch, 2);
win.putAttribs(leftMar2 + col + (col / 8), row + 1, cFileSearch, 1);
}
lineOffset += lineWidth;
} // end for row up to numLines
win.update();
} // end FileDisplay::display
//--------------------------------------------------------------------
// Edit the file:
//
// Returns:
// true: File changed
// false: File did not change
bool FileDisplay::edit(const FileDisplay* other)
{
if (!bufContents && offset)
return false; // You must not be completely past EOF
if (!writable) {
File w = OpenFile(fileName, true);
if (w == InvalidFile) return false;
CloseFile(file);
file = w;
writable = true;
}
if (bufContents < bufSize)
memset(data + bufContents, 0, bufSize - bufContents);
short x = 0;
short y = 0;
bool hiNib = true;
bool ascii = false;
bool changed = false;
int key;
const Byte *const inputTable = ((displayTable == ebcdicDisplayTable)
? ascii2ebcdicTable
: NULL); // No translation
showEditPrompt();
win.setCursor(leftMar,1);
ConWindow::showCursor();
for (;;) {
win.setCursor((ascii ? leftMar2 + x : leftMar + 3*x + !hiNib) + (x / 8),
y+1);
key = win.readKey();
switch (key) {
case KEY_ESCAPE: goto done;
case KEY_TAB:
hiNib = true;
ascii = !ascii;
break;
case KEY_DELETE:
case KEY_BACKSPACE:
case KEY_LEFT:
if (!hiNib)
hiNib = true;
else {
if (!ascii) hiNib = false;
if (--x < 0) x = lineWidth-1;
}
if (hiNib || (x < lineWidth-1))
break;
// else fall thru
case KEY_UP: if (--y < 0) y = numLines-1; break;
default: {
int newByte = -1;
if ((key == KEY_RETURN) && other &&
(other->bufContents > static_cast<Size>(x) + static_cast<Size>(y) * static_cast<Size>(lineWidth))) {
newByte = other->data[y * lineWidth + x]; // Copy from other file
hiNib = ascii; // Always advance cursor to next byte
} else if (ascii) {
if (isprint(key)) newByte = (inputTable ? inputTable[key] : key);
} else { // hex
if (isdigit(key))
newByte = key - '0';
else if (isxdigit(key))
newByte = safeUC(key) - 'A' + 10;
if (newByte >= 0) {
if (hiNib)
newByte = (newByte * 0x10) | (0x0F & data[y * lineWidth + x]);
else
newByte |= 0xF0 & data[y * lineWidth + x];
} // end if valid digit entered
} // end else hex
if (newByte >= 0) {
changed = true;
setByte(x,y,static_cast<Byte>(newByte));
} else
break;
} // end default and fall thru
case KEY_RIGHT:
if (hiNib && !ascii)
hiNib = false;
else {
hiNib = true;
if (++x >= lineWidth) x = 0;
}
if (x || !hiNib)
break;
// else fall thru
case KEY_DOWN: if (++y >= numLines) y = 0; break;
} // end switch
} // end forever
done:
if (changed) {
promptWin.clear();
promptWin.border();
promptWin.put(30,1,"Save changes (Y/N):");
promptWin.update();
promptWin.setCursor(50,1);
key = promptWin.readKey();
if (safeUC(key) != 'Y') {
changed = false;
moveTo(offset); // Re-read buffer contents
} else {
SeekFile(file, offset);
WriteFile(file, data, bufContents);
}
}
showPrompt();
ConWindow::hideCursor();
return changed;
} // end FileDisplay::edit
//--------------------------------------------------------------------
void FileDisplay::setByte(short x, short y, Byte b)
{
if (static_cast<Size>(x) + static_cast<Size>(y) * static_cast<Size>(lineWidth) >= bufContents) {
if (static_cast<Size>(x) + static_cast<Size>(y) * static_cast<Size>(lineWidth) > bufContents) {
short y1 = static_cast<short>(bufContents / lineWidth);
short x1 = static_cast<short>(bufContents % lineWidth);
while (y1 <= numLines) {
while (x1 < lineWidth) {
if ((x1 == x) && (y1 == y)) goto done;
setByte(x1,y1,0);
++x1;
}
x1 = 0;
++y1;
} // end while y1
} // end if more than 1 byte past the end
done:
++bufContents;
data[y * lineWidth + x] = static_cast<Byte>(b ^ 1); // Make sure it's different
} // end if past the end
if (data[y * lineWidth + x] != b) {
data[y * lineWidth + x] = b;
char str[3];
snprintf(str, sizeof(str), "%02X", b);
win.setAttribs(cFileEdit);
win.put(leftMar + 3*x + (x / 8), y+1, str);
str[0] = displayTable[b];
str[1] = '\0';
win.put(leftMar2 + x + (x / 8), y+1, str);
win.setAttribs(cFileWin);
win.update();
}
} // end FileDisplay::setByte
//--------------------------------------------------------------------
// Change the file position:
//
// Changes the file offset and updates the buffer.
// Does not update the display.
//
// Input:
// step:
// The number of bytes to move
// A negative value means to move backward
//
// void FileDisplay::move(int step) /* Inline function */
//--------------------------------------------------------------------
// Change the file position:
//
// Changes the file offset and updates the buffer.
// Does not update the display.
//
// Input:
// newOffset:
// The new position of the file
void FileDisplay::moveTo(FPos newOffset)
{
if (!fileName[0]) return; // No file
offset = newOffset;
if (offset < 0)
offset = 0;
if (offset > filesize)
offset = filesize;
SeekFile(file, offset);
bufContents = ReadFile(file, data, bufSize);
} // end FileDisplay::moveTo
//--------------------------------------------------------------------
// Change the file position by searching:
//
// Changes the file offset and updates the buffer.
// Does not update the display.
//
// Input:
// searchFor: The bytes to search for
// searchLen: The number of bytes in searchFor
//
// Returns:
// true: The search was successful
// false: Search unsuccessful, file not moved
bool FileDisplay::moveTo(const Byte* searchFor, size_t searchLen)
{
if (! fileName[0]) return true; // No file, pretend success
const int blockSize = 1024 * 1024;
Byte *const searchBuf = new Byte[blockSize + searchLen];
FPos newPos = offset + 1;
SeekFile(file, newPos);
Size bytesRead = ReadFile(file, searchBuf + searchLen, blockSize);
for (size_t l = searchLen; bytesRead > 0; l = 0) { // adjust for first block
for (size_t i=0; i <= bytesRead - l; ++i) {
if (*searchFor == searchBuf[l + i]) {
if (! memcmp(searchFor, searchBuf + l + i, searchLen)) {
delete [] searchBuf;
moveTo(newPos + static_cast<FPos>(i - searchLen + l));
search = searchLen;
return true;
}
}
}
newPos += blockSize;
memcpy(searchBuf, searchBuf + blockSize, searchLen);
bytesRead = ReadFile(file, searchBuf + searchLen, blockSize);
}
delete [] searchBuf;
return false;
} // end FileDisplay::moveTo
//--------------------------------------------------------------------
// Change the file position by searching backward:
//
// Changes the file offset and updates the buffer.
// Does not update the display.
//
// Input:
// searchFor: The bytes to search for
// searchLen: The number of bytes in searchFor
//
// Returns:
// true: The search was successful
// false: Search unsuccessful, file not moved
bool FileDisplay::moveToBack(const Byte* searchFor, size_t searchLen)
{
if (! fileName[0] || offset == 0)
return true;
const int blockSize = 8 * 1024 * 1024;
Byte *const searchBuf = new Byte[blockSize + searchLen];
memcpy(searchBuf + blockSize, data, searchLen);
FPos newPos = offset - blockSize;
FPos diff = 0;
for (;;) {
if (newPos < 0) {
diff = newPos;
newPos = 0;
}
SeekFile(file, newPos);
if ((ReadFile(file, searchBuf, blockSize)) <= 0) break;
if (diff)
memmove(searchBuf + (blockSize + diff), searchBuf + blockSize, searchLen);
for (FPos i = blockSize - 1 + diff; i >= 0; --i) {
if (*searchFor == searchBuf[i]) {
if (! memcmp(searchFor, searchBuf + i, searchLen)) {
delete [] searchBuf;
moveTo(newPos + i);
search = searchLen;
return true;
}
}
}
if (! newPos) break;
memcpy(searchBuf + blockSize, searchBuf, searchLen);
newPos -= blockSize;
}
delete [] searchBuf;
return false;
} // end FileDisplay::moveToBack
//--------------------------------------------------------------------
// Move to the end of the file:
//
// Input:
// other: If non NULL, move both files to the end of the shorter file
void FileDisplay::moveToEnd(FileDisplay* other)
{
if (!fileName[0]) return; // No file
FPos end = SeekFile(file, 0, SeekEnd);
FPos diff = 0;
if (other) {
// If the files aren't currently at the same position,
// we want to keep them offset by the same amount:
diff = other->offset - offset;
end = min(end, SeekFile(other->file, 0, SeekEnd) - diff);
} // end if moving other file too
end -= steps[cmmMovePage];
end -= end % 0x10;
moveTo(end);
if (other) other->moveTo(end + diff);
} // end FileDisplay::moveToEnd
//--------------------------------------------------------------------
// Open a file for display:
//
// Opens the file, updates the filename display, and reads the start
// of the file into the buffer.
//
// Input:
// aFileName: The name of the file to open
//
// Returns:
// True: Operation successful
// False: Unable to open file (call ErrorMsg for error message)
bool FileDisplay::setFile(const char* aFileName)
{
strncpy_s(fileName, sizeof(fileName), aFileName, _TRUNCATE);
win.put(0,0, fileName);
win.putAttribs(0,0, cFileName, screenWidth);
win.update(); // FIXME
bufContents = 0;
file = OpenFile(fileName);
writable = false;
if (file == InvalidFile)
return false;
filesize = SeekFile(file, 0, SeekEnd);
SeekFile(file, 0);
offset = 0;
bufContents = ReadFile(file, data, bufSize);
return true;
} // end FileDisplay::setFile
//====================================================================
// Main Program:
//--------------------------------------------------------------------
void calcScreenLayout(/*bool resize = true*/)
{
short screenX, screenY;
ConWindow::getScreenSize(screenX, screenY);
if (screenX < screenWidth_min) {
ostringstream err;
err << "The screen must be at least "
<< screenWidth_min << " characters wide.";
exitMsg(2, err.str().c_str());
}
if (screenX >= screenWidth_4) {
lineWidth = lineWidth_4;
screenWidth = screenWidth_4;
leftMar2 = leftMar2_4;
} else if (screenX >= screenWidth_3) {
lineWidth = lineWidth_3;
screenWidth = screenWidth_3;
leftMar2 = leftMar2_3;
} else {
lineWidth = lineWidth_2;
screenWidth = screenWidth_2;
leftMar2 = leftMar2_2;
}
if (screenY < promptHeight + 4) {
ostringstream err;
err << "The screen must be at least "
<< (promptHeight + 4) << " lines high.";
exitMsg(2, err.str().c_str());
}
numLines = screenY - promptHeight - (singleFile ? 1 : 2);
if (singleFile)
linesBetween = 0;
else {
linesBetween = numLines % 2;
numLines = (numLines - linesBetween) / 2;
}
bufSize = static_cast<Size>(numLines) * static_cast<Size>(lineWidth);
steps[cmmMovePage] = bufSize-lineWidth;
// FIXME resize existing windows
} // end calcScreenLayout
//--------------------------------------------------------------------
void displayCharacterSet()
{
const bool isASCII = (displayTable == asciiDisplayTable);
promptWin.putAttribs(4,2, (isASCII ? cCurrentMode : cBackground), 5);
promptWin.putAttribs(10,2, (isASCII ? cBackground : cCurrentMode), 6);
promptWin.update();
} // end displayCharacterSet
//--------------------------------------------------------------------
void displayLockState()
{
#ifndef WIN32_CONSOLE // The Win32 version uses Ctrl & Alt instead
if (singleFile) return;
promptWin.putAttribs(67,1,
((lockState == lockBottom) ? cCurrentMode : cBackground),
8);
promptWin.putAttribs(67,2,
((lockState == lockTop) ? cCurrentMode : cBackground),
11);
#endif
} // end displayLockState
//--------------------------------------------------------------------
// Print a message to stderr and exit:
//
// Input:
// status: The exit status to use
// message: The message to print
[[ noreturn ]]
void exitMsg(int status, const char* message)
{
ConWindow::shutdown();