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https://github.com/freemkv/libfreemkv.git
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Matthew Jackson
6e14fc0c0c
Security - Remove the unsafe Vec::set_len over recycled sector buffers — UB reachable from safe code (GHSA-j8ww-f5fg-9pmh, low). Uses Vec::resize; pooling unchanged. CI / tooling - clippy on stable with the MSRV single-sourced from Cargo.toml; cargo-deny dependency-audit gate with first-party git sources allowed (#15); audience-based comment-guard (#17). Docs - README (keydb ownership, BD-J parser count), drive-access transport/reset notes, mux timeline module-doc links.
18 lines
897 B
Markdown
18 lines
897 B
Markdown
# disc_tests: capacity/layer derivation
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`scan_image_reports_capacity_in_bytes_and_the_layer_count` covers the scan
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reporting the medium's size on both axes it exposes, derived from the one
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sector count the caller hands in:
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* `capacity_bytes` is that sector count times the 2048-byte logical sector
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(ECMA-167 / BD-ROM logical block size). It is what sizes a full-disc image
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read and what the progress percentage divides by, so a wrong scale is a
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wrong ISO length, not a cosmetic number.
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* `layers` distinguishes single- from dual-layer media. The threshold sits
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between the two real capacities: a single-layer BD-25 is 12,219,392
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sectors (25,025,314,816 bytes / 2048) and a dual-layer BD-50 is 24,438,784
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sectors, so BD-25 must report 1 layer and BD-50 must report 2.
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`scan_image` takes the sector count as a parameter, so this exercises the
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real derivation without a 50 GB fixture.
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