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Add repr(c) for SplitStream header structs #266

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Merged
cgwalters merged 1 commit into from
Mar 17, 2026
Merged

Add repr(c) for SplitStream header structs #266

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3 changes: 3 additions & 0 deletions crates/composefs/src/splitstream.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -41,13 +41,15 @@ const SPLITSTREAM_MAGIC: [u8; 11] = *b"SplitStream";
const LG_BLOCKSIZE: u8 = 12; // TODO: hard-coded 4k. make this generic later...

// Nearly everything in the file is located at an offset indicated by a FileRange.
#[repr(C)]
#[derive(Debug, Clone, Copy, FromBytes, Immutable, IntoBytes, KnownLayout)]
struct FileRange {
start: U64,
end: U64,
}

// The only exception is the header: it is a fixed sized and comes at the start (offset 0).
#[repr(C)]
#[derive(Debug, FromBytes, Immutable, IntoBytes, KnownLayout)]
struct SplitstreamHeader {
pub magic: [u8; 11], // Contains SPLITSTREAM_MAGIC
Expand All @@ -59,6 +61,7 @@ struct SplitstreamHeader {
}

// The info block can be located anywhere, indicated by the "info" FileRange in the header.
#[repr(C)]
#[derive(Debug, FromBytes, Immutable, IntoBytes, KnownLayout)]
struct SplitstreamInfo {
pub stream_refs: FileRange, // location of the stream references array
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