The test is only compatible with the conversion of DWG files from versions up to 2000 to DXF format.

[NANCHENG6]

Is it like this for everyone? Or are there any other solutions? In 2004, 2007, 2010, 2013 and 2018, the files could not be opened after being converted to dxf, and the same issue occurred when converting to svg.

[NANCHENG6]

The code being used is from the master branch.

[NANCHENG6]

For DWG versions prior to 2000, after conversion, the following error occurred and it was unable to be opened normally.

Reading DWG file SM-0.dwg
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: Invalid CMC method 0x0 ignored
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: Invalid CMC flag 0x93 ignored
ERROR: Invalid CMC method 0x1f ignored
ERROR: bit_read_BL: unexpected 2-bit code: '11'
ERROR: Invalid CMC flag 0xa4 ignored
ERROR: Invalid CMC method 0x0 ignored
ERROR: bit_read_BL: unexpected 2-bit code: '11'
ERROR: Invalid CMC flag 0x62 ignored
ERROR: Invalid CMC method 0x0 ignored
ERROR: Invalid CMC method 0x40 ignored
ERROR: bit_read_TU buffer overflow at 756.4 + 11488 > 1605
Warning: check_CRC mismatch 2496-2671 = 175: 2437 <=> D34D

Warning: check_CRC mismatch 1293-1493 = 200: B821 <=> 8B5E

Warning: check_CRC mismatch 1495-1687 = 192: A7CE <=> 2A94

Warning: check_CRC mismatch 1689-1934 = 245: 0508 <=> DF60

Warning: check_CRC mismatch 1936-2225 = 289: 0BFB <=> 158D

Warning: check_CRC mismatch 4100-10387 = 6287: 6F6C <=> 550F

Warning: check_CRC mismatch 10389-15011 = 4622: 4A54 <=> B5FC

Warning: check_CRC mismatch 15013-18753 = 3740: 9B64 <=> F778

Warning: check_CRC mismatch 18755-20870 = 2115: 1FBF <=> 791F

Warning: check_CRC mismatch 20872-24143 = 3271: E358 <=> 501E

Warning: check_CRC mismatch 24145-25298 = 1153: 0CDE <=> 2633

Warning: check_CRC mismatch 25300-32152 = 6852: 8DA7 <=> BE91

Warning: check_CRC mismatch 32154-35878 = 3724: 5FAF <=> D33D

Warning: check_CRC mismatch 35880-40606 = 4726: 9112 <=> C5EF

Warning: check_CRC mismatch 40608-41979 = 1371: B201 <=> D853

Warning: check_CRC mismatch 41981-49028 = 7047: E6CD <=> 1751

Warning: check_CRC mismatch 49030-50628 = 1598: 6431 <=> 23C8

Warning: check_CRC mismatch 50630-55000 = 4370: 3F93 <=> 74C4

Warning: check_CRC mismatch 55002-57917 = 2915: 209C <=> FBEC

Warning: check_CRC mismatch 57919-63478 = 5559: 11A9 <=> C5C2

Warning: check_CRC mismatch 63480-67220 = 3740: 064A <=> 3DB2

Warning: check_CRC mismatch 67222-69337 = 2115: A828 <=> BA1C

Warning: check_CRC mismatch 69339-70492 = 1153: 0073 <=> E8BE

Warning: check_CRC mismatch 70494-74727 = 4233: 4318 <=> 927C

Warning: check_CRC mismatch 74729-77644 = 2915: 488A <=> CCF3

Warning: check_CRC mismatch 77646-82866 = 5220: DB3D <=> 2AD2

Warning: check_CRC mismatch 82868-86956 = 4088: 5421 <=> D0E5

Warning: check_CRC mismatch 86958-88911 = 1953: 0C59 <=> 4D5D

Warning: check_CRC mismatch 88913-90511 = 1598: 1A13 <=> BCEA

Warning: check_CRC mismatch 90513-95854 = 5341: CFFD <=> 53CA

Warning: check_CRC mismatch 95856-102506 = 6650: B034 <=> 51CF

Warning: check_CRC mismatch 102729-106243 = 3514: A4E1 <=> 5720

Warning: check_CRC mismatch 106245-109104 = 2859: DE64 <=> A252

Warning: check_CRC mismatch 109106-113728 = 4622: C6F8 <=> 2194

Warning: Ignore invalid handleoff (@223)
Warning: Ignore invalid handleoff (@239)
Warning: Ignore invalid handleoff (@241)
Warning: Ignore invalid handleoff (@243)
Warning: Invalid object size 16966 > 7623. Would overflow
Warning: Invalid object size 8407232 > 7582. Would overflow
Warning: Ignore invalid handleoff (@247)
Warning: Invalid object size 8407232 > 7582. Would overflow
Warning: Ignore invalid handleoff (@249)
Warning: Invalid object size 8407232 > 7582. Would overflow
Warning: Ignore invalid handleoff (@251)
Warning: Invalid object size 8407232 > 7582. Would overflow
Warning: Ignore invalid handleoff (@253)
Warning: Invalid object size 8407232 > 7582. Would overflow
Warning: Ignore invalid handleoff (@255)
ERROR: Invalid object handle 0.0.0 at pos @3.2
Warning: check_CRC mismatch 114664-114924 = 260: 90A2 <=> 8104

Warning: Ignore invalid handleoff (@257)
Warning: offset 39 looks wrong, should be prevsize 256 + 4
Warning: Invalid object size 8407232 > 7499. Would overflow
Warning: Ignore invalid handleoff (@259)
Warning: Invalid object size 8407232 > 7499. Would overflow
Warning: Ignore invalid handleoff (@261)
Warning: Invalid object size 8407232 > 7499. Would overflow
Warning: Ignore invalid handleoff (@263)
Warning: offset 41 looks wrong, should be prevsize 256 + 4
Warning: Invalid object size 16795840 > 7459. Would overflow
ERROR: Invalid object type 1808, only 13 classes
ERROR: Invalid class index 1308 >= 13
ERROR: Invalid object handle 4.0.0 at pos @2.2
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
ERROR: bit_read_BD: unexpected 2-bit code: '11'
Warning: Invalid handle-reference, longer than 8 bytes: 3.13.0
Warning: Invalid handle-reference, longer than 8 bytes: 12.12.0
Warning: check_CRC mismatch 114787-115302 = 515: 36F0 <=> C01C

Warning: Ignore invalid handleoff (@273)
Warning: offset 226 looks wrong, should be prevsize 512 + 4
ERROR: bit_read_MS: error parsing modular short, i=-1,j=30,result=679477191
ERROR: bit_read_BB buffer overflow at 0.0 >= 0
ERROR: bit_read_BOT buffer overflow at 0.0 >= 0
ERROR: Invalid object type 0, only 13 classes
ERROR: Invalid class index -500 < 0
Warning: Ignore invalid handleoff (@276)
Warning: offset 245 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 19457 > 6946. Would overflow
Warning: Ignore invalid handleoff (@279)
Warning: offset 232 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 8345 > 6715. Would overflow
Warning: Ignore invalid handleoff (@282)
Warning: offset 251 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 12801 > 6464. Would overflow
Warning: Ignore invalid handleoff (@285)
Warning: offset 239 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 16389 > 6225. Would overflow
Warning: Ignore invalid handleoff (@288)
Warning: offset 235 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 403708162 > 5988. Would overflow
Warning: Ignore invalid handleoff (@291)
Warning: offset 239 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 403708162 > 5749. Would overflow
Warning: Ignore invalid handleoff (@294)
Warning: offset 228 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 7939 > 5522. Would overflow
Warning: Ignore invalid handleoff (@297)
Warning: offset 236 looks wrong, should be prevsize 512 + 4
ERROR: Invalid object type 546, only 13 classes
ERROR: Invalid class index 46 >= 13
Warning: Ignore invalid handleoff (@300)
Warning: offset 247 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 12801 > 5040. Would overflow
Warning: Ignore invalid handleoff (@303)
Warning: offset 233 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 19457 > 4806. Would overflow
Warning: Ignore invalid handleoff (@306)
Warning: offset 243 looks wrong, should be prevsize 512 + 4
ERROR: bit_read_MS: error parsing modular short, i=-1,j=30,result=613027916
ERROR: bit_read_BB buffer overflow at 0.0 >= 0
ERROR: bit_read_BOT buffer overflow at 0.0 >= 0
ERROR: Invalid object type 0, only 13 classes
ERROR: Invalid class index -500 < 0
Warning: Ignore invalid handleoff (@309)
Warning: offset 233 looks wrong, should be prevsize 512 + 4
ERROR: bit_read_MS: error parsing modular short, i=-1,j=30,result=613027916
ERROR: bit_read_BB buffer overflow at 0.0 >= 0
ERROR: bit_read_BOT buffer overflow at 0.0 >= 0
ERROR: Invalid object type 0, only 13 classes
ERROR: Invalid class index -500 < 0
Warning: Ignore invalid handleoff (@312)
Warning: offset 241 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 4752 > 4090. Would overflow
Warning: Ignore invalid handleoff (@315)
Warning: offset 241 looks wrong, should be prevsize 512 + 4
Warning: Invalid object size 419463169 > 3847. Would overflow
Warning: Ignore invalid handleoff (@318)
Warning: offset 242 looks wrong, should be prevsize 512 + 4
ERROR: Invalid EED size 1364 > 384
Warning: check_CRC mismatch 118598-118985 = 387: 5B12 <=> 0D32

Warning: Ignore invalid handleoff (@321)
Warning: offset 182 looks wrong, should be prevsize 384 + 4
Warning: Invalid object size 5200 > 3425. Would overflow
Warning: Ignore invalid handleoff (@324)
Warning: offset 186 looks wrong, should be prevsize 384 + 4
ERROR: Invalid object handle 0.0.0 at pos @2.2
ERROR: Invalid DIMENSION_RADIUS.class_version 18
Warning: check_CRC mismatch 118966-119033 = 67: B56B <=> 0532

ERROR: bit_read_MS: error parsing modular short, i=-1,j=30,result=604391552
ERROR: bit_read_BB buffer overflow at 0.0 >= 0
ERROR: bit_read_BOT buffer overflow at 0.0 >= 0
ERROR: Invalid object type 0, only 13 classes
ERROR: Invalid class index -500 < 0
Warning: Invalid string stream data_size 6559 > bitsize 723 at @88.2

Warning: Invalid handle-reference, longer than 8 bytes: 0.12.0
ERROR: Invalid object handle 0.12.0 at pos @2.2
ERROR: bit_read_BD: unexpected 2-bit code: '11'
Warning: Unknown flag (0x90)
Warning: Unknown flag (0x5d60)
Warning: Unknown flag (0x8108)
Warning: Invalid handle-reference, longer than 8 bytes: 15.4.0
Warning: check_CRC mismatch 119410-119516 = 106: 5E19 <=> FFFF

ERROR: Invalid object type 576, only 13 classes
ERROR: Invalid class index 76 >= 13
Warning: Invalid object size 16408 > 2323. Would overflow
Warning: Invalid object size 12801 > 2068. Would overflow
ERROR: Invalid object type 25856, only 13 classes
ERROR: Invalid class index 25356 >= 13
ERROR: obj_string_stream overflow, bitsize 4294381968 => 8592 (strpos 536797745 > diff 1073)
ERROR: Invalid EED size 5457 > 1074
ERROR: Invalid DIMENSION_LINEAR.class_version 48
Warning: check_CRC mismatch 120369-121448 = 1079: F870 <=> 0000

Warning: Ignore invalid handleoff (@350)
Warning: offset 104 looks wrong, should be prevsize 1074 + 4
Warning: Invalid object size 2632 > 1732. Would overflow
Warning: Ignore invalid handleoff (@353)
Warning: offset 104 looks wrong, should be prevsize 1074 + 4
Warning: Invalid object size 609419268 > 1626. Would overflow
Warning: Ignore invalid handleoff (@356)
ERROR: Invalid object type 648, only 13 classes
ERROR: Invalid class index 148 >= 13
ERROR: Invalid object type 161, only 13 classes
ERROR: Invalid class index -339 < 0
ERROR: Invalid object type 0, only 13 classes
ERROR: Invalid class index -500 < 0
ERROR: bit_read_BB buffer overflow at 0.0 >= 0
ERROR: bit_read_BOT buffer overflow at 0.0 >= 0
ERROR: Invalid object type 0, only 13 classes
ERROR: Invalid class index -500 < 0
ERROR: Invalid object type 579, only 13 classes
ERROR: Invalid class index 79 >= 13
ERROR: bit_read_MS: error parsing modular short, i=-1,j=30,result=381714431
ERROR: bit_read_BB buffer overflow at 0.0 >= 0
ERROR: bit_read_BOT buffer overflow at 0.0 >= 0
ERROR: Invalid object type 0, only 13 classes
ERROR: Invalid class index -500 < 0
Warning: Ignore invalid handleoff (@380)
Warning: offset 31 looks wrong, should be prevsize 1074 + 4
Warning: Invalid object size 807404276 > 424. Would overflow
Warning: Ignore invalid handleoff (@382)
Warning: offset 41 looks wrong, should be prevsize 1074 + 4
Warning: Invalid object size 5412 > 385. Would overflow
Warning: Ignore invalid handleoff (@384)
Warning: Invalid object size 5412 > 385. Would overflow
Warning: Ignore invalid handleoff (@386)
ERROR: Invalid object type 25668, only 13 classes
ERROR: Invalid class index 25168 >= 13
Warning: Ignore invalid handleoff (@390)
Warning: offset 19 looks wrong, should be prevsize 1074 + 4
ERROR: unknown EED code 16
ERROR: Invalid EED size 35328 > 6641
ERROR: bit_read_TU buffer overflow at 6384.1 + 16412 > 6641
Warning: Unknown flag (0x10)
Warning: Unknown flag (0x1040)
ERROR: Invalid ATTDEF.is_locked_in_block 144
Warning: check_CRC mismatch 3612-10256 = 6644: 1DFE <=> B176

Warning: Handles page CRC mismatch: D555 vs calc. E9C1 from 0-392=392

Warning: Object handle not found 2097209/0x200039
Warning: Object handle not found 2097195/0x20002B in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097194/0x20002A in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097169/0x200011 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097169/0x200011 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097194/0x20002A in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097198/0x20002E in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097200/0x200030 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097202/0x200032 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097207/0x200037 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097208/0x200038 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097174/0x200016 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097197/0x20002D in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097156/0x200004 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097157/0x200005 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097158/0x200006 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097159/0x200007 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097160/0x200008 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097161/0x200009 in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097162/0x20000A in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097163/0x20000B in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097164/0x20000C in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097165/0x20000D in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097166/0x20000E in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097167/0x20000F in 89 objects of max 0x200039 handles
Warning: Object handle not found 2097168/0x200010 in 89 objects of max 0x200039 handles
Warning: Object handle not found 1680608384/0x642C0C80
Writing DXF file SM-0.dxf```

[NANCHENG6]

When converting DWG to SVG, the following error occurred and no files were generated.

(base) root@suma-pc:/data/software/libredwg/bin# ./dwg2SVG SM-0.dwg 
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg
   xmlns:svg="http://www.w3.org/2000/svg"
   xmlns="http://www.w3.org/2000/svg"
   xmlns:xlink="http://www.w3.org/1999/xlink"
   version="1.1" baseProfile="basic"
   width="100%" height="100%"
   viewBox="1.000000 -178555197844351660773558466130259627692360550426685501276885774427940969614730319149817599544921582363513676759142448016848853159903265554432.000000 -1.000000 178555197844351660773558466130259627692360550426685501276885774427940969614730319149817599544921582363513676759142448016848853159903265554432.000000">
        <g id="symbol-1B" >
                <!-- *Paper_Space -->
        </g>
        <!-- *Model_Space -->
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
        <defs>
        <g id="symbol-23" >
                <!-- *Paper_Space -->
        </g>
        </defs>
</svg>

[NANCHENG6]

The test was conducted using the source code from the 0.13.3.7852 branch for compilation. The same error occurred in the Linux environment as well.

[michal-josef-spacek]

@NANCHENG6 Your issue report is not usable for any action.

Could you send some example file and describe process which are you using?

[rurban]

When converting DWG to SVG, the following error occurred and no files were generated.

(base) root@suma-pc:/data/software/libredwg/bin# ./dwg2SVG SM-0.dwg 
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg
   xmlns:svg="http://www.w3.org/2000/svg"
   xmlns="http://www.w3.org/2000/svg"
   xmlns:xlink="http://www.w3.org/1999/xlink"
   version="1.1" baseProfile="basic"
   width="100%" height="100%"
   viewBox="1.000000 -178555197844351660773558466130259627692360550426685501276885774427940969614730319149817599544921582363513676759142448016848853159903265554432.000000 -1.000000 178555197844351660773558466130259627692360550426685501276885774427940969614730319149817599544921582363513676759142448016848853159903265554432.000000">
        <g id="symbol-1B" >
                <!-- *Paper_Space -->
        </g>
        <!-- *Model_Space -->
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
HATCH ignored
        <defs>
        <g id="symbol-23" >
                <!-- *Paper_Space -->
        </g>
        </defs>
</svg>

This is the SVG. On stdout.