Bug Summary

File:dwgbuffer.cpp
Warning:line 520, column 29
The result of left shift is undefined because the right operand '45' is not smaller than 32, the capacity of 'int'

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name dwgbuffer.cpp -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 2 -fhalf-no-semantic-interposition -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/runner/work/LibreCAD/LibreCAD/libraries/libdxfrw -fcoverage-compilation-dir=/home/runner/work/LibreCAD/LibreCAD/libraries/libdxfrw -resource-dir /usr/lib/llvm-18/lib/clang/18 -D _REENTRANT -D MUPARSER_STATIC -D QT_NO_DEBUG -I . -I ../../../Qt/6.9.0/gcc_64/mkspecs/linux-g++ -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14 -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/14/../../../../include/x86_64-linux-gnu/c++/14 -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/backward -internal-isystem /usr/lib/llvm-18/lib/clang/18/include -internal-isystem /usr/local/include -internal-isystem /usr/bin/../lib/gcc/x86_64-linux-gnu/14/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -std=gnu++1z -fdeprecated-macro -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -vectorize-loops -vectorize-slp -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/runner/work/LibreCAD/LibreCAD/out/2025-10-22-184117-6593-1 -x c++ src/intern/dwgbuffer.cpp
1/******************************************************************************
2** libDXFrw - Library to read/write DXF files (ascii & binary) **
3** **
4** Copyright (C) 2011-2015 José F. Soriano, rallazz@gmail.com **
5** **
6** This library is free software, licensed under the terms of the GNU **
7** General Public License as published by the Free Software Foundation, **
8** either version 2 of the License, or (at your option) any later version. **
9** You should have received a copy of the GNU General Public License **
10** along with this program. If not, see <http://www.gnu.org/licenses/>. **
11******************************************************************************/
12
13
14#include "dwgbuffer.h"
15#include "../libdwgr.h"
16#include "drw_textcodec.h"
17#include "drw_dbg.h"
18//#include <bitset>
19/*#include <fstream>
20#include <algorithm>
21#include <sstream>
22#include "dwgreader.h"*/
23//#include "dxfwriter.h"
24
25
26//#define FIRSTHANDLE 48
27
28/*enum sections {
29 secUnknown,
30 secHeader,
31 secTables,
32 secBlocks,
33 secEntities,
34 secObjects
35};*/
36
37static unsigned int crctable[256]= {
380x0000,0xC0C1,0xC181,0x0140,0xC301,0x03C0,0x0280,0xC241,
390xC601,0x06C0,0x0780,0xC741,0x0500,0xC5C1,0xC481,0x0440,
400xCC01,0x0CC0,0x0D80,0xCD41,0x0F00,0xCFC1,0xCE81,0x0E40,
410x0A00,0xCAC1,0xCB81,0x0B40,0xC901,0x09C0,0x0880,0xC841,
420xD801,0x18C0,0x1980,0xD941,0x1B00,0xDBC1,0xDA81,0x1A40,
430x1E00,0xDEC1,0xDF81,0x1F40,0xDD01,0x1DC0,0x1C80,0xDC41,
440x1400,0xD4C1,0xD581,0x1540,0xD701,0x17C0,0x1680,0xD641,
450xD201,0x12C0,0x1380,0xD341,0x1100,0xD1C1,0xD081,0x1040,
460xF001,0x30C0,0x3180,0xF141,0x3300,0xF3C1,0xF281,0x3240,
470x3600,0xF6C1,0xF781,0x3740,0xF501,0x35C0,0x3480,0xF441,
480x3C00,0xFCC1,0xFD81,0x3D40,0xFF01,0x3FC0,0x3E80,0xFE41,
490xFA01,0x3AC0,0x3B80,0xFB41,0x3900,0xF9C1,0xF881,0x3840,
500x2800,0xE8C1,0xE981,0x2940,0xEB01,0x2BC0,0x2A80,0xEA41,
510xEE01,0x2EC0,0x2F80,0xEF41,0x2D00,0xEDC1,0xEC81,0x2C40,
520xE401,0x24C0,0x2580,0xE541,0x2700,0xE7C1,0xE681,0x2640,
530x2200,0xE2C1,0xE381,0x2340,0xE101,0x21C0,0x2080,0xE041,
540xA001,0x60C0,0x6180,0xA141,0x6300,0xA3C1,0xA281,0x6240,
550x6600,0xA6C1,0xA781,0x6740,0xA501,0x65C0,0x6480,0xA441,
560x6C00,0xACC1,0xAD81,0x6D40,0xAF01,0x6FC0,0x6E80,0xAE41,
570xAA01,0x6AC0,0x6B80,0xAB41,0x6900,0xA9C1,0xA881,0x6840,
580x7800,0xB8C1,0xB981,0x7940,0xBB01,0x7BC0,0x7A80,0xBA41,
590xBE01,0x7EC0,0x7F80,0xBF41,0x7D00,0xBDC1,0xBC81,0x7C40,
600xB401,0x74C0,0x7580,0xB541,0x7700,0xB7C1,0xB681,0x7640,
610x7200,0xB2C1,0xB381,0x7340,0xB101,0x71C0,0x7080,0xB041,
620x5000,0x90C1,0x9181,0x5140,0x9301,0x53C0,0x5280,0x9241,
630x9601,0x56C0,0x5780,0x9741,0x5500,0x95C1,0x9481,0x5440,
640x9C01,0x5CC0,0x5D80,0x9D41,0x5F00,0x9FC1,0x9E81,0x5E40,
650x5A00,0x9AC1,0x9B81,0x5B40,0x9901,0x59C0,0x5880,0x9841,
660x8801,0x48C0,0x4980,0x8941,0x4B00,0x8BC1,0x8A81,0x4A40,
670x4E00,0x8EC1,0x8F81,0x4F40,0x8D01,0x4DC0,0x4C80,0x8C41,
680x4400,0x84C1,0x8581,0x4540,0x8701,0x47C0,0x4680,0x8641,
690x8201,0x42C0,0x4380,0x8341,0x4100,0x81C1,0x8081,0x4040 };
70
71static unsigned int crc32Table[256] ={
720x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
730x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
740x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
750x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
760x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
770x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
780x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
790x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
800x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
810x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
820x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
830x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
840x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
850x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
860x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
870x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
880xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
890xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
900xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
910xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
920xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
930xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
940xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
950xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
960x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
970x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
980x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
990x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
1000xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
1010xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
1020xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
1030xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d};
104
105union typeCast {
106 char buf[8];
107 duint16 i16;
108 duint32 i32;
109 duint64 i64;
110 ddouble64 d64;
111};
112
113bool dwgFileStream::setPos(duint64 p){
114 if (p >= sz)
115 return false;
116
117 stream->seekg(p);
118 return stream->good();
119}
120
121bool dwgFileStream::read(duint8* s, duint64 n){
122 stream->read (reinterpret_cast<char*>(s),n);
123 return stream->good();
124}
125
126bool dwgCharStream::setPos(duint64 p){
127 if (p > size()) {
128 isOk = false;
129 return false;
130 }
131
132 pos = p;
133 return true;
134}
135
136bool dwgCharStream::read(duint8* s, duint64 n){
137 if ( n > (sz - pos) ) {
138 isOk = false;
139 return false;
140 }
141 for (duint64 i=0; i<n; i++){
142 s[i]= stream[pos++];
143 }
144 return true;
145}
146
147dwgBuffer::dwgBuffer(duint8 *buf, duint64 size, DRW_TextCodec *dc)
148 :decoder{dc}
149 ,filestr{new dwgCharStream(buf, size)}
150 ,maxSize{size}
151{}
152
153dwgBuffer::dwgBuffer(std::ifstream *stream, DRW_TextCodec *dc)
154 :decoder{dc}
155 ,filestr{new dwgFileStream(stream)}
156 ,maxSize{filestr->size()}
157{}
158
159dwgBuffer::dwgBuffer( const dwgBuffer& org )
160 :decoder{org.decoder}
161 ,filestr{org.filestr->clone()}
162 ,maxSize{filestr->size()}
163 ,currByte{org.currByte}
164 ,bitPos{org.bitPos}
165{}
166
167dwgBuffer& dwgBuffer::operator=( const dwgBuffer& org ){
168 filestr.reset( org.filestr->clone());
169 decoder = org.decoder;
170 maxSize = filestr->size();
171 currByte = org.currByte;
172 bitPos = org.bitPos;
173 return *this;
174}
175
176/**Gets the current byte position in buffer **/
177duint64 dwgBuffer::getPosition() const{
178 if (bitPos != 0)
179 return filestr->getPos() -1;
180 return filestr->getPos();
181 }
182
183/**Sets the buffer position in pos byte, reset the bit position **/
184bool dwgBuffer::setPosition(duint64 pos){
185 bitPos = 0;
186/* if (pos>=maxSize)
187 return false;*/
188 return filestr->setPos(pos);
189// return true;
190}
191
192//RLZ: Fails if ... ???
193void dwgBuffer::setBitPos(duint8 pos){
194 if (pos>7)
195 return;
196 if (pos != 0 && bitPos == 0){
197 duint8 buffer;
198 filestr->read (&buffer,1);
199 currByte = buffer;
200 }
201 if (pos == 0 && bitPos != 0){//reset current byte
202 filestr->setPos(filestr->getPos()-1);
203 }
204 bitPos = pos;
205}
206
207bool dwgBuffer::moveBitPos(dint32 size){
208 if (size == 0) return true;
209
210 dint32 b= size + bitPos;
211 filestr->setPos(getPosition() + (b >> 3) );
212 bitPos = b & 7;
213
214 if (bitPos != 0){
215 filestr->read (&currByte,1);
216 }
217 return filestr->good();
218}
219
220/**Reads one Bit returns a char with value 0/1 (B) **/
221duint8 dwgBuffer::getBit(){
222 duint8 buffer;
223 duint8 ret = 0;
224 if (bitPos == 0){
225 filestr->read (&buffer,1);
226 currByte = buffer;
227 }
228
229 ret = (currByte >> (7 - bitPos) & 1);
230 bitPos +=1;
231 if (bitPos == 8)
232 bitPos = 0;
233
234 return ret;
235}
236
237/**Reads one Bit returns a bool value 0==false 1==true (B) **/
238bool dwgBuffer::getBoolBit(){
239 return (getBit() != 0);
240}
241
242/**Reads two Bits returns a char (BB) **/
243duint8 dwgBuffer::get2Bits(){
244 duint8 buffer;
245 duint8 ret = 0;
246 if (bitPos == 0){
247 filestr->read (&buffer,1);
248 currByte = buffer;
249 }
250
251 bitPos +=2;
252 if (bitPos < 9)
253 ret = currByte >>(8 - bitPos);
254 else {//read one bit per byte
255 ret = currByte << 1;
256 filestr->read (&buffer,1);
257 currByte = buffer;
258 bitPos = 1;
259 ret = ret | currByte >> 7;
260 }
261 if (bitPos == 8)
262 bitPos = 0;
263 ret = ret & 3;
264 return ret;
265}
266
267/**Reads thee Bits returns a char (3B) **/
268//RLZ: todo verify this
269duint8 dwgBuffer::get3Bits(){
270 duint8 buffer;
271 duint8 ret = 0;
272 if (bitPos == 0){
273 filestr->read (&buffer,1);
274 currByte = buffer;
275 }
276
277 bitPos +=3;
278 if (bitPos < 9)
279 ret = currByte >>(8 - bitPos);
280 else {//read one bit per byte
281 ret = currByte << 1;
282 filestr->read (&buffer,1);
283 currByte = buffer;
284 bitPos = 1;
285 ret = ret | currByte >> 7;
286 }
287 if (bitPos == 8)
288 bitPos = 0;
289 ret = ret & 7;
290 return ret;
291}
292
293/**Reads tree Bits returns a char (3B) for R24 **/
294//to be written
295
296/**Reads compressed Short (max. 16 + 2 bits) little-endian order, returns a UNsigned 16 bits (BS) **/
297duint16 dwgBuffer::getBitShort(){
298 duint8 b = get2Bits();
299 if (b == 0)
300 return getRawShort16();
301 else if (b== 1)
302 return getRawChar8();
303 else if (b == 2)
304 return 0;
305 else
306 return 256;
307}
308/**Reads compressed Short (max. 16 + 2 bits) little-endian order, returns a signed 16 bits (BS) **/
309dint16 dwgBuffer::getSBitShort(){
310 duint8 b = get2Bits();
311 if (b == 0)
312 return static_cast<dint16>(getRawShort16());
313 else if (b== 1)
314 return static_cast<dint16>(getRawChar8());
315 else if (b == 2)
316 return 0;
317 else
318 return 256;
319}
320
321/**Reads compressed 32 bits Int (max. 32 + 2 bits) little-endian order, returns a signed 32 bits (BL) **/
322//to be written
323dint32 dwgBuffer::getBitLong(){
324 dint8 b = get2Bits();
325 if (b == 0)
326 return getRawLong32();
327 else if (b== 1)
328 return getRawChar8();
329 else //if (b == 2)
330 return 0;
331}
332
333/**Reads compressed 64 bits Int (max. 56 + 3 bits) little-endian order, returns a unsigned 64 bits (BLL) **/
334duint64 dwgBuffer::getBitLongLong(){
335 dint8 b = get3Bits();
336 duint64 ret=0;
337 for (duint8 i=0; i<b; i++){
338 ret = ret << 8;
339 ret |= getRawChar8();
340 }
341 return ret;
342}
343
344/**Reads compressed Double (max. 64 + 2 bits) returns a floating point double of 64 bits (BD) **/
345double dwgBuffer::getBitDouble(){
346 dint8 b = get2Bits();
347 if (b == 1)
348 return 1.0;
349 else if (b == 0){
350 duint8 buffer[8];
351 if (bitPos != 0) {
352 for (int i = 0; i < 8; i++)
353 buffer[i] = getRawChar8();
354 } else {
355 filestr->read (buffer,8);
356 }
357 double* ret = reinterpret_cast<double*>( buffer );
358 return *ret;
359 }
360 // if (b == 2)
361 return 0.0;
362}
363
364/**Reads 3 compressed Double (max. 64 + 2 bits) returns a DRW_Coord of floating point double of 64 bits (3BD) **/
365DRW_Coord dwgBuffer::get3BitDouble(){
366 DRW_Coord crd;
367 crd.x = getBitDouble();
368 crd.y = getBitDouble();
369 crd.z = getBitDouble();
370 return crd;
371}
372
373/**Reads raw char 8 bits returns a unsigned char (RC) **/
374duint8 dwgBuffer::getRawChar8(){
375 duint8 ret=0;
376 duint8 buffer=0;
377 filestr->read (&buffer,1);
378 if (bitPos == 0)
379 return buffer;
380 else {
381 ret = currByte << bitPos;
382 currByte = buffer;
383 ret = ret | (currByte >>(8 - bitPos));
384 }
385 return ret;
386}
387
388/**Reads raw short 16 bits little-endian order, returns a unsigned short (RS) **/
389duint16 dwgBuffer::getRawShort16(){
390 duint8 buffer[2]={0,0};
391 duint16 ret=0;
392
393 filestr->read (buffer,2);
394 if (bitPos == 0) {
395 /* no offset directly swap bytes for little-endian */
396 ret = (buffer[1] << 8) | (buffer[0] & 0x00FF);
397 } else {
398 ret = (buffer[0] << 8) | (buffer[1] & 0x00FF);
399 /* apply offset */
400 ret = ret >> (8 - bitPos);
401 ret = ret | (currByte << (8 + bitPos));
402 currByte = buffer[1];
403 /* swap bytes for little-endian */
404 ret = (ret << 8) | (ret >> 8);
405 }
406 return ret;
407}
408
409/**Reads raw double IEEE standard 64 bits returns a double (RD) **/
410double dwgBuffer::getRawDouble(){
411 duint8 buffer[8];
412 memset(buffer,0,sizeof(buffer));
413 if (bitPos == 0)
414 filestr->read (buffer,8);
415 else {
416 for (int i = 0; i < 8; i++)
417 buffer[i] = getRawChar8();
418 }
419 double* nOffset = reinterpret_cast<double*>( buffer );
420 return *nOffset;
421}
422
423/**Reads 2 raw double IEEE standard 64 bits returns a DRW_Coord of floating point double 64 bits (2RD) **/
424DRW_Coord dwgBuffer::get2RawDouble(){
425 DRW_Coord crd;
426 crd.x = getRawDouble();
427 crd.y = getRawDouble();
428 return crd;
429}
430
431
432/**Reads raw int 32 bits little-endian order, returns a unsigned (RL) **/
433duint32 dwgBuffer::getRawLong32(){
434 duint16 tmp1 = getRawShort16();
435 duint16 tmp2 = getRawShort16();
436 duint32 ret = (tmp2 << 16) | (tmp1 & 0x0000FFFF);
437
438 return ret;
439}
440
441/**Reads raw int 64 bits little-endian order, returns a unsigned long long (RLL) **/
442duint64 dwgBuffer::getRawLong64(){
443 duint32 tmp1 = getRawLong32();
444 duint64 tmp2 = getRawLong32();
445 duint64 ret = (tmp2 << 32) | (tmp1 & 0x00000000FFFFFFFF);
446
447 return ret;
448}
449
450/**Reads modular unsigner int, char based, compressed form, little-endian order, returns a unsigned (U-MC) **/
451duint32 dwgBuffer::getUModularChar(){
452 std::vector<duint8> buffer;
453 duint32 result =0;
454 for (int i=0; i<4;i++){
455 duint8 b= getRawChar8();
456 buffer.push_back(b & 0x7F);
457 if (! (b & 0x80))
458 break;
459 }
460 int offset = 0;
461 for (unsigned int i=0; i<buffer.size();i++){
462 result += buffer[i] << offset;
463 offset +=7;
464 }
465//RLZ: WARNING!!! needed to verify on read handles
466 //result = result & 0x7F;
467 return result;
468}
469
470/**Reads modular int, char based, compressed form, little-endian order, returns a signed int (MC) **/
471dint32 dwgBuffer::getModularChar(){
472 bool negative = false;
473 std::vector<dint8> buffer;
474 dint32 result =0;
475 for (int i=0; i<4;i++){
476 duint8 b= getRawChar8();
477 buffer.push_back(b & 0x7F);
478 if (! (b & 0x80))
479 break;
480 }
481 dint8 b= buffer.back();
482 if (b & 0x40) {
483 negative = true;
484 buffer.pop_back();
485 buffer.push_back(b & 0x3F);
486 }
487
488 int offset = 0;
489 for (unsigned int i=0; i<buffer.size();i++){
490 result += buffer[i] << offset;
491 offset +=7;
492 }
493 if (negative)
494 result = -result;
495 return result;
496}
497
498/**Reads modular int, short based, compressed form, little-endian order, returns a unsigned (MC) **/
499dint32 dwgBuffer::getModularShort(){
500// bool negative = false;
501 std::vector<dint16> buffer;
502 dint32 result =0;
503 for (int i=0; i<2;i++){
1
Loop condition is true. Entering loop body
→
504 duint16 b= getRawShort16();
505 buffer.push_back(b & 0x7FFF);
506 if (! (b & 0x8000))
2
←
Assuming the condition is true
→
3
←
Taking true branch
→
507 break;
4
←
 Execution continues on line 518
→
508 }
509
510 //only positive ?
511/* dint8 b= buffer.back();
512 if (! (b & 0x40)) {
513 negative = true;
514 buffer.pop_back();
515 buffer.push_back(b & 0x3F);
516 }*/
517
518 int offset = 0;
519 for (unsigned int i=0; i<buffer.size();i++){
5
←
Assuming the condition is true
→
6
←
Loop condition is true. Entering loop body
→
7
←
Assuming the condition is true
→
8
←
Loop condition is true. Entering loop body
→
9
←
Assuming the condition is true
→
10
←
Loop condition is true. Entering loop body
→
12
←
Assuming the condition is true
→
13
←
Loop condition is true. Entering loop body
→
520 result += buffer[i] << offset;
14
←
The result of left shift is undefined because the right operand '45' is not smaller than 32, the capacity of 'int'
521 offset +=15;
11
←
The value 45 is assigned to 'offset'
→
522 }
523/* if (negative)
524 result = -result;*/
525 return result;
526}
527
528dwgHandle dwgBuffer::getHandle(){ //H
529 dwgHandle hl;
530 duint8 data = getRawChar8();
531 hl.code = (data >> 4) & 0x0F;
532 hl.size = data & 0x0F;
533 hl.ref=0;
534 for (int i=0; i< hl.size;i++){
535 hl.ref = (hl.ref << 8) | getRawChar8();
536 }
537 return hl;
538}
539
540dwgHandle dwgBuffer::getOffsetHandle(duint32 href){ //H
541 dwgHandle hl = getHandle();
542 if (hl.code > 5){
543 if (hl.code == 0x0C)
544 hl.ref = href - hl.ref;
545 else if (hl.code == 0x0A)
546 hl.ref = href + hl.ref;
547 else if (hl.code == 0x08)
548 hl.ref = href - 1;
549 else if (hl.code == 0x06)
550 hl.ref = href + 1;
551//all are soft pointer reference change to 7 (without offset)
552 hl.code = 7;
553 }
554 return hl;
555}
556
557//internal until 2004
558std::string dwgBuffer::get8bitStr(){
559 duint16 textSize = getBitShort();
560 if (textSize == 0)
561 return std::string();
562 duint8 *tmpBuffer = new duint8[textSize];
563 bool good = getBytes(tmpBuffer, textSize);
564 if (!good)
565 return std::string();
566
567/* filestr->read (buffer,textSize);
568 if (!filestr->good())
569 return std::string();
570
571 duint8 tmp;
572 if (bitPos != 0){
573 for (int i=0; i<textSize;i++){
574 tmp = buffer[i];
575 buffer[i] = (currByte << bitPos) | (tmp >> (8 - bitPos));
576 currByte = tmp;
577 }
578 }*/
579 std::string str(reinterpret_cast<char*>(tmpBuffer), textSize);
580 delete[]tmpBuffer;
581
582 return str;
583}
584
585//internal since 2007 //pending: are 2 bytes null terminated??
586//nullTerm = true if string are 2 bytes null terminated from the stream
587std::string dwgBuffer::get16bitStr(duint16 textSize, bool nullTerm){
588 if (textSize == 0)
589 return std::string();
590 textSize *=2;
591 duint16 ts = textSize;
592 if (nullTerm)
593 ts += 2;
594 duint8 *tmpBuffer = new duint8[textSize + 2];
595 bool good = getBytes(tmpBuffer, ts);
596 if (!good)
597 return std::string();
598 if (!nullTerm) {
599 tmpBuffer[textSize] = '\0';
600 tmpBuffer[textSize + 1] = '\0';
601 }
602 std::string str(reinterpret_cast<char*>(tmpBuffer), ts);
603 delete[]tmpBuffer;
604
605 return str;
606}
607
608//T 8 bit text converted from codepage to utf8
609std::string dwgBuffer::getCP8Text(){
610 std::string strData;
611 strData = get8bitStr();//RLZ correct these function
612 if (!decoder)
613 return strData;
614
615 return decoder->toUtf8(strData);
616}
617
618//TU unicode 16 bit (UCS) text converted to utf8
619/**Reads 2-bytes char (UCS2, NULL terminated) and convert to std::string (only for Latin-1)
620 ts= total input size in bytes.
621**/
622std::string dwgBuffer::getUCSStr(duint16 ts){
623 std::string strData;
624 if (ts<4) //at least 1 char
625 return std::string();
626 strData = get16bitStr(ts/2, false);
627 if (!decoder)
628 return strData;
629
630 return decoder->toUtf8(strData);
631}
632
633//TU unicode 16 bit (UCS) text converted to utf8
634//nullTerm = true if string are 2 bytes null terminated from the stream
635std::string dwgBuffer::getUCSText(bool nullTerm){
636 std::string strData;
637 duint16 ts = getBitShort();
638 if (ts == 0)
639 return std::string();
640
641 strData = get16bitStr(ts, nullTerm);
642 if (!decoder)
643 return strData;
644
645 return decoder->toUtf8(strData);
646}
647
648//RLZ: read a T or TU if version is 2007+
649//nullTerm = true if string are 2 bytes null terminated from the stream
650std::string dwgBuffer::getVariableText(DRW::Version v, bool nullTerm){//TV
651 if (v > DRW::AC1018)
652 return getUCSText(nullTerm);
653 return getCP8Text();
654}
655duint16 dwgBuffer::getObjType(DRW::Version v){//OT
656 if (v > DRW::AC1021) {
657 duint8 b = get2Bits();
658 if (b == 0)
659 return getRawChar8();
660 else if (b== 1){
661 return (getRawChar8() + 0x01F0);
662 } else //b == 2
663 return getRawShort16();
664 }
665 return getBitShort();
666}
667
668/* Bit Extrusion
669* For R2000+, this is a single bit, If the single bit is 1,
670* the extrusion value is assumed to be 0,0,1 and no explicit
671* extrusion is stored. If the single bit is 0, then it will
672* be followed by 3BD.
673* For R13-R14 this is 3BD.
674*/
675DRW_Coord dwgBuffer::getExtrusion(bool b_R2000_style) {
676 DRW_Coord ext(0.0,0.0,1.0);
677 if ( b_R2000_style )
678 /* If the bit is one, the extrusion value is assumed to be 0,0,1*/
679 if ( getBit() == 1 )
680 return ext;
681 /*R13-R14 or bit == 0*/
682 ext.x = getBitDouble();
683 ext.y = getBitDouble();
684 ext.z = getBitDouble();
685 return ext;
686}
687
688/**Reads compressed Double with default (max. 64 + 2 bits) returns a floating point double of 64 bits (DD) **/
689double dwgBuffer::getDefaultDouble(double d){
690 dint8 b = get2Bits();
691 if (b == 0)
692 return d;
693 else if (b == 1){
694 duint8 buffer[4];
695 char *tmp=nullptr;
696 if (bitPos != 0) {
697 for (int i = 0; i < 4; i++)
698 buffer[i] = getRawChar8();
699 } else {
700 filestr->read (buffer,4);
701 }
702 tmp = reinterpret_cast<char*>(&d);
703 for (int i = 0; i < 4; i++)
704 tmp[i] = buffer[i];
705 double ret = *reinterpret_cast<double*>( tmp );
706 return ret;
707 } else if (b == 2){
708 duint8 buffer[6];
709 char *tmp=nullptr;
710 if (bitPos != 0) {
711 for (int i = 0; i < 6; i++)
712 buffer[i] = getRawChar8();
713 } else {
714 filestr->read (buffer,6);
715 }
716 tmp = reinterpret_cast<char*>(&d);
717 for (int i = 2; i < 6; i++)
718 tmp[i-2] = buffer[i];
719 tmp[4] = buffer[0];
720 tmp[5] = buffer[1];
721 double ret = *reinterpret_cast<double*>( tmp );
722 return ret;
723 }
724 // if (b == 3) return a full raw double
725 return getRawDouble();
726}
727
728
729/* BitThickness
730* For R13-R14, this is a BD.
731* For R2000+, this is a single bit, If the bit is one,
732* the thickness value is assumed to be 0.0, if not a BD follow
733*/
734double dwgBuffer::getThickness(bool b_R2000_style) {
735 if ( b_R2000_style )
736 /* If the bit is one, the thickness value is assumed to be 0.0.*/
737 if ( getBit() == 1 )
738 return 0.0;
739 /*R13-R14 or bit == 0*/
740 return getBitDouble();
741}
742
743/* CmColor (CMC)
744* For R15 and earlier call directly BS as ACIS color.
745* For R2004+, can be CMC or ENC
746* RGB value, first 4bits 0xC0 => ByLayer, 0xC1 => ByBlock, 0xC2 => RGB, 0xC3 => last 4 are ACIS
747*/
748duint32 dwgBuffer::getCmColor(DRW::Version v) {
749 if (v < DRW::AC1018) //2000-
750 return getSBitShort();
751 duint16 idx = getBitShort();
752 duint32 rgb = getBitLong();
753 duint8 cb = getRawChar8();
754 duint8 type = rgb >> 24;
755 DRW_DBG("\ntype COLOR: ")DRW_dbg::getInstance()->print("\ntype COLOR: "); DRW_DBGH(type)DRW_dbg::getInstance()->printH(type);
756 DRW_DBG("\nindex COLOR: ")DRW_dbg::getInstance()->print("\nindex COLOR: "); DRW_DBGH(idx)DRW_dbg::getInstance()->printH(idx);
757 DRW_DBG("\nRGB COLOR: ")DRW_dbg::getInstance()->print("\nRGB COLOR: "); DRW_DBGH(rgb)DRW_dbg::getInstance()->printH(rgb);
758 DRW_DBG("\nbyte COLOR: ")DRW_dbg::getInstance()->print("\nbyte COLOR: "); DRW_DBGH(cb)DRW_dbg::getInstance()->printH(cb);
759 if (cb&1){
760 std::string colorName = getVariableText(v, false);
761 DRW_DBG("\ncolorName: ")DRW_dbg::getInstance()->print("\ncolorName: "); DRW_DBG(colorName)DRW_dbg::getInstance()->print(colorName);
762 }
763 if (cb&2){
764 std::string bookName = getVariableText(v, false);
765 DRW_DBG("\nbookName: ")DRW_dbg::getInstance()->print("\nbookName: "); DRW_DBG(bookName)DRW_dbg::getInstance()->print(bookName);
766 }
767 switch (type) {
768 case 0xC0:
769 return 256;//ByLayer
770 case 0xC1:
771 return 0;//ByBlock
772 case 0xC2:
773 return 256;//RGB RLZ TODO
774 case 0xC3:
775 return rgb&0xFF;//ACIS
776 default:
777 break;
778 }
779 //check cb if strings follows RLZ TODO
780 return 256; //default return ByLayer
781}
782
783/* EnColor (ENC)
784* For R15 and earlier call directly BS as ACIS color.
785* For R2004+, can be CMC or ENC
786* RGB value, first 4bits 0xC0 => ByLayer, 0xC1 => ByBlock, 0xC2 => RGB, 0xC3 => last 4 are ACIS
787*/
788duint32 dwgBuffer::getEnColor(DRW::Version v) {
789 if (v < DRW::AC1018) //2000-
790 return getSBitShort();
791 duint32 rgb = 0;
792 duint32 cb = 0;
793 duint16 idx = getBitShort();
794 DRW_DBG("idx reads COLOR: ")DRW_dbg::getInstance()->print("idx reads COLOR: "); DRW_DBGH(idx)DRW_dbg::getInstance()->printH(idx);
795 duint16 flags = idx>>8;
796 idx = idx & 0x1FF; //RLZ: warning this is correct?
797 DRW_DBG("\nflag COLOR: ")DRW_dbg::getInstance()->print("\nflag COLOR: "); DRW_DBGH(flags)DRW_dbg::getInstance()->printH(flags);
798 DRW_DBG(", index COLOR: ")DRW_dbg::getInstance()->print(", index COLOR: "); DRW_DBGH(idx)DRW_dbg::getInstance()->printH(idx);
799// if (flags & 0x80) {
800// rgb = getBitLong();
801// DRW_DBG("\nRGB COLOR: "); DRW_DBGH(rgb);
802// }
803 if (flags & 0x20) {
804 cb = getBitLong();
805 DRW_DBG("\nTransparency COLOR: ")DRW_dbg::getInstance()->print("\nTransparency COLOR: "); DRW_DBGH(cb)DRW_dbg::getInstance()->printH(cb);
806 }
807 if (flags & 0x40)
808 DRW_DBG("\nacdbColor COLOR are present")DRW_dbg::getInstance()->print("\nacdbColor COLOR are present"
);
809 else {
810 if (flags & 0x80) {
811 rgb = getBitLong();
812 DRW_DBG("\nRGB COLOR: ")DRW_dbg::getInstance()->print("\nRGB COLOR: "); DRW_DBGH(rgb)DRW_dbg::getInstance()->printH(rgb);
813 }
814 }
815
816/* if (flags & 0x80)
817 return getBitLong();*/
818
819 return idx; //default return ByLayer
820}
821
822
823/**Reads raw short 16 bits big-endian order, returns a unsigned short crc & size **/
824duint16 dwgBuffer::getBERawShort16(){
825 char buffer[2];
826 buffer[0] = getRawChar8();
827 buffer[1] = getRawChar8();
828 duint16 size = (buffer[0] << 8) | (buffer[1] & 0xFF);
829 return size;
830}
831
832/* reads "size" bytes and stores in "buf" return false if fail */
833bool dwgBuffer::getBytes(unsigned char *buf, duint64 size){
834 duint8 tmp;
835 filestr->read (buf,size);
836 if (!filestr->good())
837 return false;
838
839 if (bitPos != 0){
840 for (duint64 i=0; i<size;i++){
841 tmp = buf[i];
842 buf[i] = (currByte << bitPos) | (tmp >> (8 - bitPos));
843 currByte = tmp;
844 }
845 }
846 return true;
847}
848
849duint16 dwgBuffer::crc8(duint16 dx,dint32 start,dint32 end){
850 duint64 pos = filestr->getPos();
851 filestr->setPos(start);
852 int n = end-start;
853 duint8 *tmpBuf = new duint8[n];
854 duint8 *p = tmpBuf;
855 filestr->read (tmpBuf,n);
856 filestr->setPos(pos);
857 if (!filestr->good())
858 return 0;
859
860 duint8 al;
861
862 while (n-- > 0) {
863 al = (duint8)((*p) ^ ((dint8)(dx & 0xFF)));
864 dx = (dx>>8) & 0xFF;
865 dx = dx ^ crctable[al & 0xFF];
866 p++;
867 }
868 delete[]tmpBuf;
869 return(dx);
870}
871
872duint32 dwgBuffer::crc32(duint32 seed,dint32 start,dint32 end){
873 duint64 pos = filestr->getPos();
874 filestr->setPos(start);
875 int n = end-start;
876 duint8 *tmpBuf = new duint8[n];
877 duint8 *p = tmpBuf;
878 filestr->read (tmpBuf,n);
879 filestr->setPos(pos);
880 if (!filestr->good())
881 return 0;
882
883 duint32 invertedCrc = ~seed;
884 while (n-- > 0) {
885 duint8 data = *p++;
886 invertedCrc = (invertedCrc >> 8) ^ crc32Table[(invertedCrc ^ data) & 0xff];
887 }
888 delete[]tmpBuf;
889 return ~invertedCrc;
890}
891
892
893/*std::string dwgBuffer::getBytes(int size){
894 char buffer[size];
895 char tmp;
896 filestr->read (buffer,size);
897 if (!filestr->good())
898 return NULL;
899
900 if (bitPos != 0){
901 for (int i=0; i<=size;i++){
902 tmp = buffer[i];
903 buffer[i] = (currByte << bitPos) | (tmp >> (8 - bitPos));
904 currByte = tmp;
905 }
906 }
907 std::string st;
908 for (int i=0; i<size;i++) {
909 st.push_back(buffer[i]);
910 }
911 return st;
912// return std::string(buffer);
913}*/
914