File: gptpart.cc

package info (click to toggle)
gdisk 1.0.5-1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 940 kB
  • sloc: cpp: 8,692; sh: 244; makefile: 48
file content (463 lines) | stat: -rw-r--r-- 14,402 bytes parent folder | download
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
//
// C++ Implementation: gptpart
//
// Description: Class to implement a SINGLE GPT partition
//
//
// Author: Rod Smith <rodsmith@rodsbooks.com>, (C) 2009-2018
//
// Copyright: See COPYING file that comes with this distribution
//
//
// This program is copyright (c) 2009 by Roderick W. Smith. It is distributed
// under the terms of the GNU GPL version 2, as detailed in the COPYING file.

#define __STDC_LIMIT_MACROS
#define __STDC_CONSTANT_MACROS

#ifdef USE_UTF16
#include <unicode/ustdio.h>
#else
#define UnicodeString string
#endif

#include <string.h>
#include <stdio.h>
#include <iostream>
#include "gptpart.h"
#include "attributes.h"

using namespace std;

GPTPart::GPTPart(void) {
   partitionType.Zero();
   uniqueGUID.Zero();
   firstLBA = 0;
   lastLBA = 0;
   attributes = 0;
   memset(name, 0, NAME_SIZE * sizeof(name[0]) );
} // Default constructor

GPTPart::GPTPart(const GPTPart & orig) {
   partitionType = orig.partitionType;
   uniqueGUID = orig.uniqueGUID;
   firstLBA = orig.firstLBA;
   lastLBA = orig.lastLBA;
   attributes = orig.attributes;
   memcpy(name, orig.name, NAME_SIZE * sizeof( name[ 0 ] ) );
} // Copy constructor

GPTPart::~GPTPart(void) {
} // destructor

// Return the gdisk-specific two-byte hex code for the partition
uint16_t GPTPart::GetHexType(void) const {
   return partitionType.GetHexType();
} // GPTPart::GetHexType()

// Return a plain-text description of the partition type (e.g., "Linux/Windows
// data" or "Linux swap").
string GPTPart::GetTypeName(void) {
   return partitionType.TypeName();
} // GPTPart::GetNameType()

#ifdef USE_UTF16
// Return a Unicode description of the partition type (e.g., "Linux/Windows
// data" or "Linux swap").
UnicodeString GPTPart::GetUTypeName(void) {
   return partitionType.UTypeName();
} // GPTPart::GetNameType()
#endif

// Compute and return the partition's length (or 0 if the end is incorrectly
// set before the beginning).
uint64_t GPTPart::GetLengthLBA(void) const {
   uint64_t length = 0;

   if (firstLBA <= lastLBA)
      length = lastLBA - firstLBA + UINT64_C(1);
   return length;
} // GPTPart::GetLengthLBA()

#ifdef USE_UTF16
// Return partition's name field, converted to a Unicode string
UnicodeString GPTPart::GetDescription(void) {
   return (UChar*) name;
} // GPTPart::GetDescription()
#else
// Return partition's name field, converted to a C++ UTF-8 string
string GPTPart::GetDescription(void) {
   // convert name to utf32 then to utf8
   string utf8 ;
   size_t pos = 0 ;
   while ( ( pos < NAME_SIZE ) && ( name[ pos ] != 0 ) ) {
      uint16_t cp = name[ pos ++ ] ;
      if ( ! IsLittleEndian() ) ReverseBytes( & cp , 2 ) ;
      // first to utf32
      uint32_t uni ;
      if ( cp < 0xd800 || cp > 0xdfff ) {
         uni = cp ;
      } // if
      else if ( cp < 0xdc00 ) {
         // lead surrogate
         uni = ( (uint32_t)( cp & 0x3ff ) ) << 10 ;
         if ( pos >= NAME_SIZE ) {
            // missing trail surrogate, name[] is invalid
            break ;
         } // if
         cp = name[ pos ++ ] ;
         if ( cp < 0xdc00 || cp > 0xdfff ) {
            // invalid trail surrogate, name[] is invalid
            break ;
         } // if
         // trail surrogate
         uni |= cp & 0x3ff ;
         uni += 0x10000 ;
      } // if
      else {
         // unexpected trail surrogate, name[] is invalid
         break ;
      } // if
      // then to utf8
      if ( uni < 0x80 ) {
         utf8 += (char) uni ;
      } // if
      else if ( uni < 0x800 ) {
         utf8 += (char) ( 0xc0 | ( uni >> 6 ) ) ;
         utf8 += (char) ( 0x80 | ( uni & 0x3f ) ) ;
      } // if
      else if ( uni < 0x10000 ) {
         utf8 += (char) ( 0xe0 | ( uni >> 12 ) ) ;
         utf8 += (char) ( 0x80 | ( ( uni >> 6 ) & 0x3f ) ) ;
         utf8 += (char) ( 0x80 | ( uni & 0x3f ) ) ;
      } // if
      else {
         utf8 += (char) ( 0xf0 | ( uni >> 18 ) ) ;
         utf8 += (char) ( 0xe0 | ( ( uni >> 12 ) & 0x3f ) ) ;
         utf8 += (char) ( 0x80 | ( ( uni >> 6 ) & 0x3f ) ) ;
         utf8 += (char) ( 0x80 | ( uni & 0x3f ) ) ;
      } // if
   }
   return utf8 ;
} // GPTPart::GetDescription(), UTF-8 version
#endif

// Return 1 if the partition is in use
int GPTPart::IsUsed(void) {
   return (partitionType != GUIDData("0x00"));
} // GPTPart::IsUsed()

// Returns MBR_SIZED_GOOD, MBR_SIZED_IFFY, or MBR_SIZED_BAD; see comments
// in header file for details.
int GPTPart::IsSizedForMBR(void) {
   int retval = MBR_SIZED_GOOD;

   if ((firstLBA > UINT32_MAX) || ((lastLBA - firstLBA) > UINT32_MAX) || (firstLBA > lastLBA))
      retval = MBR_SIZED_BAD;
   else if (lastLBA > UINT32_MAX)
      retval = MBR_SIZED_IFFY;

   return (retval);
} // GPTPart::IsSizedForMBR()

// Set the type code to the specified one. Also changes the partition
// name *IF* the current name is the generic one for the current partition
// type.
void GPTPart::SetType(PartType t) {
#ifdef USE_UTF16
   if (GetDescription() == partitionType.UTypeName()) {
#else
   if (GetDescription() == partitionType.TypeName()) {
#endif
      SetName(t.TypeName());
   } // if
   partitionType = t;
} // GPTPart::SetType()

#ifdef USE_UTF16
// Set the name for a partition to theName, using a C++-style string as
// input.
void GPTPart::SetName(const string & theName) {
   SetName((UnicodeString) theName.c_str());
} // GPTPart::SetName()

// Set the name for a partition to theName, using a Unicode string as
// input.
void GPTPart::SetName(const UnicodeString & theName) {
   if (theName.isBogus()) {
      cerr << "Bogus UTF-16 name found in GPTPart::SetName()! Name not changed!\n";
   } else {
      memset(name, 0, NAME_SIZE * sizeof(name[0]) );
      theName.extractBetween(0, NAME_SIZE, (UChar*) name);
   } // if/else
} // GPTPart::SetName()

#else

// Set the name for a partition to theName. Note that theName is a
// standard C++-style ASCII string, although the GUID partition definition
// requires a UTF-16LE string. This function creates a simple-minded copy
// for this.
void GPTPart::SetName(const string & theName) {
   // convert utf8 to utf32 then to utf16le
   size_t len = theName.length() ;
   size_t pos = 0 ;
   for ( size_t i = 0 ; pos < NAME_SIZE && i < len ; ) {
      uint32_t uni ;
      uint8_t cp = theName[ i ++ ] ;
      int todo ;
      if ( cp < 0x80 ) {
         uni = cp ;
         todo = 0 ;
      } // if
      else if ( cp < 0xc0 || cp > 0xf7 ) {
         // invalid byte, theName is broken
         break ;
      } // if
      else if ( cp < 0xe0 ) {
         uni = cp & 0x1f ;
         todo = 1 ;
      } // if
      else if ( cp < 0xf0 ) {
         uni = cp & 0x0f ;
         todo = 2 ;
      } // if
      else {
         uni = cp & 0x7 ;
         todo = 3 ;
      } // if
      while ( todo > 0 ) {
         if ( i >= len ) {
            // missing continuation byte, theName is broken
            goto break_converter ;
         } // if
         cp = theName[ i ++ ] ;
         if ( cp > 0xbf || cp < 0x80 ) {
            // invalid continuation byte, theName is broken
            goto break_converter ;
         } // if
         uni <<= 6 ;
         uni |= cp & 0x3f ;
         todo -- ;
      } // while
      // then to utf16le
      if ( uni < 0x10000 ) {
         name[ pos ] = (uint16_t) uni ;
         if ( ! IsLittleEndian() ) ReverseBytes( name + pos , 2 ) ;
         pos ++ ;
      } // if
      else {
         if ( pos > NAME_SIZE - 2 ) {
             // not enough room for two surrogates, truncate
             break ;
         } // if
         uni -= 0x10000 ;
         name[ pos ] = (uint16_t)( uni >> 10 ) | 0xd800 ;
         if ( ! IsLittleEndian() ) ReverseBytes( name + pos , 2 ) ;
         pos ++ ;
         name[ pos ] = (uint16_t)( uni & 0x3ff ) | 0xdc00 ;
         if ( ! IsLittleEndian() ) ReverseBytes( name + pos , 2 ) ;
         pos ++ ;
      }
   } // for
   break_converter : ;
   // finally fill with zeroes
   while ( pos < NAME_SIZE ) {
      name[ pos ++ ] = 0 ;
   } // while
} // GPTPart::SetName(), UTF-8 version
#endif

// Set the name for the partition based on the current GUID partition type
// code's associated name
void GPTPart::SetDefaultDescription(void) {
   SetName(partitionType.TypeName());
} // GPTPart::SetDefaultDescription()

GPTPart & GPTPart::operator=(const GPTPart & orig) {
   partitionType = orig.partitionType;
   uniqueGUID = orig.uniqueGUID;
   firstLBA = orig.firstLBA;
   lastLBA = orig.lastLBA;
   attributes = orig.attributes;
   memcpy(name, orig.name, NAME_SIZE * sizeof( name[ 0 ] ) );
   return *this;
} // assignment operator

// Compare the values, and return a bool result.
// Because this is intended for sorting and a firstLBA value of 0 denotes
// a partition that's not in use and so that should be sorted upwards,
// we return the opposite of the usual arithmetic result when either
// firstLBA value is 0.
bool GPTPart::operator<(const GPTPart &other) const {
   if (firstLBA && other.firstLBA)
      return (firstLBA < other.firstLBA);
   else
      return (other.firstLBA < firstLBA);
} // GPTPart::operator<()

// Display summary information; does nothing if the partition is empty.
void GPTPart::ShowSummary(int partNum, uint32_t blockSize) {
   string sizeInIeee;
   UnicodeString description;
   size_t i;

   if (firstLBA != 0) {
      sizeInIeee = BytesToIeee(lastLBA - firstLBA + 1, blockSize);
      cout.fill(' ');
      cout.width(4);
      cout << partNum + 1 << "  ";
      cout.width(14);
      cout << firstLBA << "  ";
      cout.width(14);
      cout << lastLBA  << "   ";
      cout << sizeInIeee << "  ";
      if (sizeInIeee.length() < 10)
         for (i = 0; i < 10 - sizeInIeee.length(); i++)
            cout << " ";
      cout.fill('0');
      cout.width(4);
      cout.setf(ios::uppercase);
      cout << hex << partitionType.GetHexType() << "  " << dec;
      cout.fill(' ');
#ifdef USE_UTF16
      GetDescription().extractBetween(0, 23, description);
      cout << description << "\n";
#else
      string desc = GetDescription() ;
      size_t n = 0 ;
      size_t i = 0 ;
      size_t len = desc.length() ;
      while ( n < 22 && i < len ) {
         i ++ ;
         if ( i >= len ) {
            // short description
            break ;
         } // if
         // skip continuation bytes
         while ( i < len && ( ( desc[ i ] & 0xC0 ) == 0x80 ) ) {
             // utf8 continuation byte
             i ++ ;
         } // while
         n ++ ;
      } // while
      if ( i < len ) {
         n = 0 ;
         i = 0 ;
         // description is long we will truncate it
         while ( n < 19 && i < len ) {
            i ++ ;
            if ( i >= len ) {
               // should not happen
               break ;
            } // if
            // skip continuation bytes
            while ( i < len && ( ( desc[ i ] & 0xC0 ) == 0x80 ) ) {
                // utf8 continuation byte
                i ++ ;
            } // while
            n ++ ;
         } // while
      } // for
      cout << GetDescription().substr( 0 , i ) ;
      if ( i < len ) cout << "..." ;
      cout << "\n";
#endif
      cout.fill(' ');
   } // if
} // GPTPart::ShowSummary()

// Show detailed partition information. Does nothing if the partition is
// empty (as determined by firstLBA being 0).
void GPTPart::ShowDetails(uint32_t blockSize) {
   uint64_t size;

   if (firstLBA != 0) {
      cout << "Partition GUID code: " << partitionType;
      cout << " (" << partitionType.TypeName() << ")\n";
      cout << "Partition unique GUID: " << uniqueGUID << "\n";

      cout << "First sector: " << firstLBA << " (at "
           << BytesToIeee(firstLBA, blockSize) << ")\n";
      cout << "Last sector: " << lastLBA << " (at "
           << BytesToIeee(lastLBA, blockSize) << ")\n";
      size = (lastLBA - firstLBA + 1);
      cout << "Partition size: " << size << " sectors ("
           << BytesToIeee(size, blockSize) << ")\n";
      cout << "Attribute flags: ";
      cout.fill('0');
      cout.width(16);
      cout << hex;
      cout << attributes << "\n";
      cout << dec;
      cout << "Partition name: '" << GetDescription() << "'\n";
      cout.fill(' ');
   }  // if
} // GPTPart::ShowDetails()

// Blank (delete) a single partition
void GPTPart::BlankPartition(void) {
   uniqueGUID.Zero();
   partitionType.Zero();
   firstLBA = 0;
   lastLBA = 0;
   attributes = 0;
   memset(name, 0, NAME_SIZE * sizeof( name[0]) );
} // GPTPart::BlankPartition

// Returns 1 if the two partitions overlap, 0 if they don't
int GPTPart::DoTheyOverlap(const GPTPart & other) {
   // Don't bother checking unless these are defined (both start and end points
   // are 0 for undefined partitions, so just check the start points)
   return firstLBA && other.firstLBA &&
          (firstLBA <= other.lastLBA) != (lastLBA < other.firstLBA);
} // GPTPart::DoTheyOverlap()

// Reverse the bytes of integral data types and of the UTF-16LE name;
// used on big-endian systems.
void GPTPart::ReversePartBytes(void) {
   int i;

   ReverseBytes(&firstLBA, 8);
   ReverseBytes(&lastLBA, 8);
   ReverseBytes(&attributes, 8);
   for (i = 0; i < NAME_SIZE; i ++ )
      ReverseBytes(name + i, 2);
} // GPTPart::ReverseBytes()

/****************************************
 * Functions requiring user interaction *
 ****************************************/

// Change the type code on the partition. Also changes the name if the original
// name is the generic one for the partition type.
void GPTPart::ChangeType(void) {
   string line;
   int changeName;
   PartType tempType = PartType::unusedPartType;

#ifdef USE_UTF16
   changeName = (GetDescription() == GetUTypeName());
#else
   changeName = (GetDescription() == GetTypeName());
#endif

   cout << "Current type is " << hex << GetHexType() << dec << " (" << GetTypeName() << ")\n";
   do {
      cout << "Hex code or GUID (L to show codes, Enter = " << hex << GetHexType() << dec << "): ";
      line = ReadString();
      if ((line[0] == 'L') || (line[0] == 'l')) {
         partitionType.ShowAllTypes();
      } else {
         if (line.length() == 0)
            tempType = GetHexType();
         else
            tempType = line;
      } // if/else
   } while (tempType == PartType::unusedPartType);
   partitionType = tempType;
   cout << "Changed type of partition to '" << partitionType.TypeName() << "'\n";
   if (changeName) {
      SetDefaultDescription();
   } // if
} // GPTPart::ChangeType()