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Warning: checksum: 0x935dbb45 (calculated) CRC mismatch 0xaafa14-0xab29e5 #1045

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rikan1 opened this issue Nov 21, 2024 · 17 comments
Open

Warning: checksum: 0x935dbb45 (calculated) CRC mismatch 0xaafa14-0xab29e5 #1045

rikan1 opened this issue Nov 21, 2024 · 17 comments

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@rikan1
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rikan1 commented Nov 21, 2024

Hello , i encountered a issue when converting a large (12MB) dwg file to json .

'Warning: checksum: 0x935dbb45 (calculated) CRC mismatch 0xaafa14-0xab29e5\n' +
'\n' +
'ERROR: Skip section AcDb:Preview with max decompression size 0x7d20 > 0x1800\n' +
'ERROR: Skip section with size 89 > 1 * 0\n' +
'ERROR: read_R2004_section_info out of range\n' +
'Warning: Failed to find section_info[9] with type 1\n' +
'ERROR: Failed to read compressed Header section\n' +
'Warning: Failed to find section_info[9] with type 3\n' +
'ERROR: Failed to read compressed Classes section\n' +
'Warning: Failed to find section_info[9] with type 4\n' +
'ERROR: Failed to read compressed Handles section\n' +
'Warning: Failed to find section_info[9] with type 2\n' +
'ERROR: Failed to read uncompressed AuxHeader section\n' +
'ERROR: Invalid section AcDb:Preview count or max decompression size. Sections: 1, Max size: 0\n' +
'ERROR: Failed to read uncompressed Preview section\n' +
'ERROR: Template section not found\n' +
'\n' +
'ERROR: Invalid num_segidx\n' +
'ERROR: Failed to decode file: /Users/somyaranjankar/Desktop/code/bbs-dwg-api/src/temp/1731333834741.dwg 0x940\n' +
'\n' +
'ERROR 0x940\n'

dwgread 0.13.3.7338 is used for conversion.
@michal-josef-spacek
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@rikan1 Hi, we need more information.

  1. You could send us the AC string from the beginning of the file.
  2. dwgread -v3 __DWG_FILE__ could help more.

@santanup
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santanup commented Nov 27, 2024 •
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@rikan1 Hi, we need more information.

  1. You could send us the AC string from the beginning of the file.
  2. dwgread -v3 __DWG_FILE__ could help more.

@michal-josef-spacek

we are getting this after adding "-v3"

'Reading DWG file /src/temp/1732731851358.dwg\n' +
"This file's version code is: AC1027 (r2013)\n" +
'is_maint: 0x8 [RC 0]\n' +
'zero_one_or_three: 0x3 [RC 0]\n' +
'thumbnail_address: 576 [RL 0]\n' +
'dwg_version: 0x21 [RC 0]\n' +
'maint_version: 0x4 [RC 0]\n' +
'codepage: 30 [RS 0]\n' +
'ANSI_1252\n' +
'unknown_0: 0x0 [RC 0]\n' +
'app_dwg_version: 0x0 [RC 0]\n' +
'app_maint_version: 0x0 [RC 0]\n' +
'security_type: 0 [RL 0]\n' +
'rl_1c_address: 0 [RL 0]\n' +

@michal-josef-spacek
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ok, we know that is AC1027

@santanup
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ok, we know that is AC1027

How to fix it? @michal-josef-spacek

@michal-josef-spacek
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@santanup I don't know what your problem is.

  1. The first message is:
    Hello , i encountered a issue when converting a large (12MB) dwg file to json .
    What is the result?

@michal-josef-spacek
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michal-josef-spacek commented Nov 28, 2024 •
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  1. The
    Warning: checksum: 0x935dbb45 (calculated) CRC mismatch 0xaafa14-0xab29e5
    is warning probably from system section.
    My example on some dwg file is
=== Read System Section (Section Page Map) @4e20 ===

section_type: 0x41630e3b [RLx 0]
decomp_data_size: 112 [RL 0]
comp_data_size: 103 [RL 0]
compression_type: 2 [RL 0]
checksum1 => 0x2099039f with seed and crc 0
checksum: 0xa8cb0e58 [RLx 0]
Warning: checksum: 0x6af11031 (calculated) CRC mismatch 0x4e34-0x4e9b

I don't know how much this is important. Probably not much in your case.

@michal-josef-spacek
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  1. Issue with preview section:
ERROR: Skip section AcDb:Preview with max decompression size 0x7d20 > 0x1800

I have similar issue in my file:

section_info[5] fields:
size:            15754
num_sections:    1
max_decomp_size: 16384 / 0x4000
unknown:         1
compressed:      1 (1=no, 2=yes)
type:            10
encrypted:       0 (0=no, 1=yes, 2=unknown)
name:            AcDb:Preview
fixedtype:       10

ERROR: Skip section AcDb:Preview with max decompression size 0x4000 > 0x1800
Page count 1 in area 5
     section[5].info[0]: AcDb:Preview type 0 => type 10
Page:    2     size: 16384 address: 0x0 info: 0x220

I don't know how much this is important. Probably not much in your case.

@michal-josef-spacek
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michal-josef-spacek commented Nov 28, 2024 •
edited
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  1. Issue:
ERROR: Skip section with size 89 > 1 * 0

and probably all other.
Probably related to something bad with reading of sections.
My exmaple of this kind of error:

ERROR: Skip section AcDb:AcDsPrototype_1b with size 2637952 > 25 * 29696
Page count 0 in area 2

section_info[3] fields:
size:            42537356099614
num_sections:    0
max_decomp_size: 0 / 0x0
unknown:         6
compressed:      10948 (1=no, 2=yes)
type:            29696
encrypted:       0 (0=no, 1=yes, 2=unknown)
name:            .
fixedtype:       0

ERROR: Skip section . with size 42537356099614 > 0 * 0
Page count 0 in area 3

section_info[4] fields:
size:            45260365365259
num_sections:    178176
max_decomp_size: 0 / 0x0
unknown:         12
compressed:      8760 (1=no, 2=yes)
type:            207872
encrypted:       0 (0=no, 1=yes, 2=unknown)
name:
fixedtype:       0

ERROR: read_R2004_section_info out of range
Warning: Failed to find section_info[4] with type 1
ERROR: Failed to read compressed Header section
Found no section_info[4] with type 9
ERROR: Failed to read uncompressed SummaryInfo section
Warning: Failed to find section_info[4] with type 3
ERROR: Failed to read compressed Classes section
Warning: Failed to find section_info[4] with type 7
ERROR: Failed to read compressed AcDbObjects section
Warning: Failed to find section_info[4] with type 2
ERROR: Failed to read uncompressed AuxHeader section
Found no section_info[4] with type 10
ERROR: Failed to read uncompressed Preview section
Found no section_info[4] with type 11
ERROR: Failed to read uncompressed AppInfo section
Found no section_info[4] with type 12
AppInfoHistory section not found

I don't know how much this is important. Probably not much in your case

@michal-josef-spacek
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What is the result? So, some section errors, and some cannot block functionality. Something is probably very bad. Without an example DWG file we cannot fix it.

@santanup
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What is the result? So, some section errors, and some cannot block functionality. Something is probably very bad. Without an example DWG file we cannot fix it.

@michal-josef-spacek
These are the files -

@michal-josef-spacek
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@santanup Thank you.
Analysis:

a) 1732784727769.dwg
Version: AC1027
Created by: Teigha
(be careful, Teigha has issues itself)
I see errors in PROXY_OBJECTs, DICTIONARY

b) 1732784624493.dwg
Version: AC1032
Created by: AutoCAD
I see many errors in many entities, In AC1032 we need to fix many things.

I could export both to JSON by:
dwgread -O JSON __INPUT_DWG__ | tee __OUTPUT_JSON__

What is the root cause, which you are trying to resolve?

@michal-josef-spacek
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@santanup Could you export some of this files to DXF by AutoCAD?

@santanup
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Okay we will try, thanks

@rikan1
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rikan1 commented Nov 28, 2024

@michal-josef-spacek
Can you please check this file .
https://d2k638bldkf5wf.cloudfront.net/importDwg/1731333834741.dwg

dwgread -O JSON INPUT_DWG. This command is failing

@michal-josef-spacek
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@rikan1 Ok, this is the real issue with no possibility of reading this file.

@rikan1
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rikan1 commented Nov 28, 2024

@michal-josef-spacek How to fix this , do you have any suggestions ?

@michal-josef-spacek
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@rikan1 Check section parsing. This is not easy to do for me.

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@michal-josef-spacek @santanup @rikan1