Cargo.toml

[package]
name = "msdos-encodings"
version = "0.1.0"
edition = "2021"
description = "Bidirectional, emulator-grade conversion between MS-DOS code pages and Unicode"
license = "MIT"

[features]
default = ["dbcs"]
# The double-byte CJK pages (932/936/949/950). Their tables are large;
# disable default features for a lean single-byte-only build.
dbcs = []

[dependencies]
thiserror = "2"

[profile.release]
lto = true
Initial crate: all 16 single-byte MS-DOS code pages, bidirectional Tables are generated from the Unicode Consortium's Microsoft mappings (VENDORS/MICSFT/PC), vendored in data/ and regenerated by tools/gen_tables.py. Decode is fallible because 857/864/869/874 leave byte values undefined; decode_lossy substitutes U+FFFD. Every table is a verified bijection, so defined bytes round-trip exactly. 2026-07-19 12:09:54 -05:00			`[package]`
			`name = "msdos-encodings"`
			`version = "0.1.0"`
			`edition = "2021"`
			`description = "Bidirectional, emulator-grade conversion between MS-DOS code pages and Unicode"`
			`license = "MIT"`

Add the four double-byte CJK pages behind an on-by-default dbcs feature Code pages 932 (Shift-JIS), 936 (GBK), 949 (Unified Hangul), and 950 (Big5), generated from the Unicode Consortium's Microsoft WINDOWS tables. Each page carries a three-state single-byte table (map / lead / undefined) plus sorted pair arrays binary-searched in both directions. Where several codes decode to one scalar (932's NEC/IBM overlap, 950's duplicated box-drawing rows), the encoder's winner is resolved from Microsoft's own bestfit WCTABLE — used only for duplicate resolution, never to import lossy best-fit mappings. The full decode direction was cross-validated against Python's cp932/936/949/950 codecs: zero mismatches over 60k+ pairs. Decode gains TruncatedPair and UndefinedPair failure modes; decode_lossy emits one U+FFFD per failed pair. Both feature configurations are clippy-clean and tested. 2026-07-19 12:28:33 -05:00			`[features]`
			`default = ["dbcs"]`
			`# The double-byte CJK pages (932/936/949/950). Their tables are large;`
			`# disable default features for a lean single-byte-only build.`
			`dbcs = []`

Initial crate: all 16 single-byte MS-DOS code pages, bidirectional Tables are generated from the Unicode Consortium's Microsoft mappings (VENDORS/MICSFT/PC), vendored in data/ and regenerated by tools/gen_tables.py. Decode is fallible because 857/864/869/874 leave byte values undefined; decode_lossy substitutes U+FFFD. Every table is a verified bijection, so defined bytes round-trip exactly. 2026-07-19 12:09:54 -05:00			`[dependencies]`
			`thiserror = "2"`

			`[profile.release]`
			`lto = true`