Example:
[LT.scr.gz](https://github.com/LibreDWG/libredwg/files/10468962/LT.scr.gz)
[LT.DWG.gz](https://github.com/LibreDWG/libredwg/files/10468963/LT.DWG.gz)

```
entities_start: 0x2e5 [RLx 0]
entities_end: 0x2e5 [RLx 0]
blocks_start: 0xffffc0bd [RLx 0]
blocks_size: 0x0 [RLx 0]
blocks_end: 0x0 [RLx 0]
blocks_max: 0x80000000 [RLx 0]
```
and
```contents table VIEW     [ 6]: size:91   num:0   (0xffffc0bd-0xffffc0bd)
Warning:
@0xc0bd => blocks_start 0xffffc0bd
ERROR: bit_read_TF buffer overflow at 49341.4294901760 + 0 > 49341
unknown (-65536):
```
Issue with block_start in case with many linetypes (AC2.10)
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : Issue with block_start in case with many linetypes (AC2.10)
Issue date:

--- start body ---
Example:
[LT.scr.gz](https://github.com/LibreDWG/libredwg/files/10468962/LT.scr.gz)
[LT.DWG.gz](https://github.com/LibreDWG/libredwg/files/10468963/LT.DWG.gz)

```
entities_start: 0x2e5 [RLx 0]
entities_end: 0x2e5 [RLx 0]
blocks_start: 0xffffc0bd [RLx 0]
blocks_size: 0x0 [RLx 0]
blocks_end: 0x0 [RLx 0]
blocks_max: 0x80000000 [RLx 0]
```
and
```contents table VIEW     [ 6]: size:91   num:0   (0xffffc0bd-0xffffc0bd)
Warning:
@0xc0bd => blocks_start 0xffffc0bd
ERROR: bit_read_TF buffer overflow at 49341.4294901760 + 0 > 49341
unknown (-65536):
```
--- end body ---

The issue indicates a potential buffer overflow vulnerability in the handling of block_start when processing DWG files with many linetypes. The warning and error messages suggest that the program attempts to read beyond the allocated buffer, which could lead to memory corruption or crashes.