purelogiccode/CHDStudio release

3.11.1 (2026-10-31)

Opening a PBP no longer decompresses disc data. PbpDiscInfo used to decode ISO block 1 in its constructor just to derive IsoSize; a container whose structure was perfectly readable but whose first block tripped the decoder therefore failed the whole file with a bare CorruptFile. IsoSize is now resolved on first use and reports 0 ("unknown") when it cannot be derived, so the disc opens and extraction reports the real block failure instead of refusing the file.
A fully populated ISO index is accepted. The parser rejected the 32,256th index entry as an overflow even though the index area holds exactly that many, so a disc that filled it could never be opened.
PBP failures now carry a cause. Every invalid block-length rejection records the block index, block count, disc, disc id and stored length in PbpDiagnostics; PbpFile.Open records the exception type and message instead of returning only an error code. The Failed to open PBP file and Failed to extract PBP file messages include that detail.
Fewer false bug reports. A damaged .ecm download (whole-image checksum mismatch) and a laserdisc AVI whose video/audio codec is not YUY2/VYUY/UYVY now log without filing a bug report; chdman's avhuff has the same codec restriction, and the messages already tell the user what to do.

CHDSharp's internal log now reaches the application log. Chd.LoggerFactory was never assigned, so the library logged into a null logger and its hunk-level diagnostics (failing hunk, codec, compressed length, file offset and the codec's own reason) were discarded. The new ChdSharpLoggerFactory bridges them to Serilog and attaches the captured detail to the messages that previously said only Decompression failed / Invalid or corrupt data.
CHDSharp warnings no longer file bug reports on their own. The bridge writes the library's Warning level at Serilog Information, because CHDSharp also uses Warning for user-data notices such as "track has subcode data; it will be omitted". Genuine failures are still reported by the app's own classified error message, now with the hunk detail attached.
Stale diagnostics cannot leak between files. Each CHD open and staged-output validation clears the previous captured warning first; a ChdFile.Open failure now includes the header/map reason too.

CodeQL code-scanning findings fixed. Archive entry paths are validated inline before extraction (the Zip Slip guard is now visible to CodeQL), the single-instance mutex, CHD container, CSO stream and chdman speed counter are disposed on every failure path, and empty catch/loop blocks were replaced with documented handling.
CHDSharp 1.6.0 is the bundled encoder/reader.
CodeQL ignores generated bin, obj, publish, dist and TestResults output.

New regression tests cover the lazy ISO size, a fully populated index area, corrupt block diagnostics, the CHDSharp log bridge and the new bug-report exclusions. The full suite passes (1182 tests: 1153 unit + 29 integration, 59 test classes); CI runs the 1153 unit tests.
JetBrains InspectCode reports zero warnings and zero errors.