purelogiccode/CHDStudio release_3.9.5

3.9.5

on GitHub

3.9.5 (2026-10-16)

Encoder library: CHDSharp 1.4.4 / 1.4.5

• Redump Dreamcast multi-cues convert byte-identically to chdman. A .cue holding both images of a GD-ROM (REM SINGLE-DENSITY AREA / REM HIGH-DENSITY AREA) previously produced a plain-CD layout; the parser now applies MAME's is_gdicue rules — pregaps move onto the previous track as split regions, the last single-density track pads up to LBA 45000, and the CHD is stamped with CHGD GD-ROM metadata. Verified against a real 1.19 GB Redump multi-cue: identical SHA-1 and metadata to chdman createcd, and chdman extractcd on the app's output restores every track byte-for-byte.
• Multisession cues (IsoBuster/ImgBurn/Redump/DiscImageCreator) are laid out like chdman. REM SESSION / REM LEAD-IN / REM LEAD-OUT and session REM PREGAP are now honored: single-bin images trim the session's last track at the declared lead-out and turn the inter-session dummy data into zero-filled pad frames (with DiscImageCreator's .img no-padding heuristic); multi-bin images get the synthesized standard lead-in/lead-out values. An inconsistent lead-out that would go negative is rejected with a clear error instead of being encoded as a silently wrong image. Byte-parity is pinned by chdman createcd fixtures for all three layouts.
• cdrdao .toc files with a bare START line convert. MAME accepts a numberless START (no pregap); the built-in parser rejected it with Malformed START command, failing every .toc chdman converts. Both START forms now produce byte-identical output to chdman.

cdrdao .toc staging and malformed-cue fixes (#68261, #68249)

• A staged .toc keeps its extension. When a descriptor needed the work directory (UTF-8 BOM, non-ASCII names, …) it was always renamed to game.cue; cdrdao syntax (TRACK MODE2_RAW, DATAFILE …) then reached the CUE parser in both encoders and failed with Malformed TRACK command: TRACK MODE2_RAW. The work descriptor is now game.toc for .toc input, and its DATAFILE/AUDIOFILE references are copied and rewritten with their SWAP/offset/length arguments preserved.
• Backslash-escaped quotes and missing BINARY tokens are repaired. A cue written as FILE \"track01.bin\" (escape backslashes, no type token) could not resolve its bin and made the fallback report Malformed FILE command. The normalizer now unescapes the name and infers the missing type from the extension, producing a canonical cue that both encoders accept.
• A descriptor that describes more data than its file holds (truncated rip) is documented and classified. chdman reports Error reading input file, the built-in encoder Unexpected end of file — both reject the same files, so it is a user-data condition; the troubleshooting page explains it and it files no bug report.

chdman crash handling (#68281)

• One conversion-time crash switches the batch to the built-in encoder. The startup probe only runs chdman help; a chdman that dies later with STATUS_ILLEGAL_INSTRUCTION (a CPU without the build's SIMD extensions) used to crash again for every file. The first negative exit code now sets a per-batch flag: the remaining files are encoded in-process, and the crash summary is excluded from bug reports as an installation problem (matching the startup-check policy).

Fewer false bug reports (#68256, #68260)

• chdman exited with code N and its output is not a valid CHD (…); discarding it. — the intermediate validation notice for a partial output no longer files a report; the classified final message still reports the real cause.
• Source file appears to be corrupt: … (a CRC/data error while copying a source for the temp retry) is a user-data condition; it is now excluded from reports and logs the underlying exception to the local log file.

Housekeeping

• Package updates: CHDSharp 1.4.3 → 1.4.5 (two parity releases, see above), NAudio 3.1.0 → 3.2.0.
• Test suite: 1146 tests (1117 unit + 29 integration) across 58 test classes; CHDSharp 1.4.5 ships 451 green tests, including the chdman byte-parity suites for the three descriptor fixes.