Reported by @xiuweihan in https://github.com/LibreDWG/libredwg/issues/946

[5172_v2.zip](https://github.com/LibreDWG/libredwg/files/14493740/5172_v2.zip)

Error:
```
=== Data Section (Section Info 2911) @2198900 ===
section_type: 0x4163003b [RLx 0]
decomp_data_size: 47892 [RL 0]
comp_data_size: 31437 [RL 0]
compression_type: 2 [RL 0]
checksum: 0xbf6ece37 [RLx 0]
ERROR: Invalid opcode 0x6 in input stream at pos 35258854
Warning: Failed to find section_info[0] with type 1
ERROR: Failed to read compressed Header section
Found no section_info[0] with type 9
ERROR: Failed to read uncompressed SummaryInfo section
Warning: Failed to find section_info[0] with type 3
ERROR: Failed to read compressed Classes section
Warning: Failed to find section_info[0] with type 7
ERROR: Failed to read compressed AcDbObjects section
Warning: Failed to find section_info[0] with type 2
ERROR: Failed to read uncompressed AuxHeader section
Found no section_info[0] with type 10
ERROR: Failed to read uncompressed Preview section
Found no section_info[0] with type 11
ERROR: Failed to read uncompressed AppInfo section
Found no section_info[0] with type 12
AppInfoHistory section not found
Found no section_info[0] with type 13
FileDepList section not found
Found no section_info[0] with type 14
Security section not found
Found no section_info[0] with type 8
RevHistory section not found
Found no section_info[0] with type 6
ObjFreeSpace section not found
Found no section_info[0] with type 5
ERROR: Template section not found
```

Issue is with unhandled opcode ```Invalid opcode 0x6 in input stream at pos 35258854```
Issue in AC1032 with decompression of sections
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : Issue in AC1032 with decompression of sections
Issue date:

--- start body ---
Reported by @xiuweihan in https://github.com/LibreDWG/libredwg/issues/946

[5172_v2.zip](https://github.com/LibreDWG/libredwg/files/14493740/5172_v2.zip)

Error:
```
=== Data Section (Section Info 2911) @2198900 ===
section_type: 0x4163003b [RLx 0]
decomp_data_size: 47892 [RL 0]
comp_data_size: 31437 [RL 0]
compression_type: 2 [RL 0]
checksum: 0xbf6ece37 [RLx 0]
ERROR: Invalid opcode 0x6 in input stream at pos 35258854
Warning: Failed to find section_info[0] with type 1
ERROR: Failed to read compressed Header section
Found no section_info[0] with type 9
ERROR: Failed to read uncompressed SummaryInfo section
Warning: Failed to find section_info[0] with type 3
ERROR: Failed to read compressed Classes section
Warning: Failed to find section_info[0] with type 7
ERROR: Failed to read compressed AcDbObjects section
Warning: Failed to find section_info[0] with type 2
ERROR: Failed to read uncompressed AuxHeader section
Found no section_info[0] with type 10
ERROR: Failed to read uncompressed Preview section
Found no section_info[0] with type 11
ERROR: Failed to read uncompressed AppInfo section
Found no section_info[0] with type 12
AppInfoHistory section not found
Found no section_info[0] with type 13
FileDepList section not found
Found no section_info[0] with type 14
Security section not found
Found no section_info[0] with type 8
RevHistory section not found
Found no section_info[0] with type 6
ObjFreeSpace section not found
Found no section_info[0] with type 5
ERROR: Template section not found
```

Issue is with unhandled opcode ```Invalid opcode 0x6 in input stream at pos 35258854```
--- end body ---

The issue indicates a potential vulnerability in the LibreDWG library related to the handling of compressed sections in AC1032 files. The presence of an unhandled opcode (0x6) suggests that the library may not properly validate or process certain input data, which could lead to unexpected behavior or crashes. This could potentially be exploited by an attacker to cause a Denial of Service (DoS) or other unintended consequences when processing specially crafted DWG files.