puffin::file_format::reader

Struct PuffinFileFooterReader

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pub struct PuffinFileFooterReader<R> {
    source: R,
    file_size: u64,
    prefetch_size: Option<u64>,
}
Expand description

Reader for the footer of a Puffin data file

The footer has a specific layout that needs to be read and parsed to extract metadata about the file, which is encapsulated in the FileMetadata type.

This reader supports prefetching, allowing for more efficient reading of the footer by fetching additional data ahead of time.

Footer layout: HeadMagic Payload PayloadSize Flags FootMagic
               [4]       [?]     [4]         [4]   [4]

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§source: R

The source of the puffin file

§file_size: u64

The content length of the puffin file

§prefetch_size: Option<u64>

The prefetch footer size

Implementations§

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impl<'a, R: RangeReader + 'a> PuffinFileFooterReader<R>

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pub fn new(source: R, content_len: u64) -> Self

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fn prefetch_size(&self) -> u64

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pub fn with_prefetch_size(self, prefetch_size: u64) -> Self

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pub async fn metadata(&'a mut self) -> Result<FileMetadata>

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fn parse_payload(&self, flags: &Flags, bytes: &[u8]) -> Result<FileMetadata>

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fn read_tailing_four_bytes(suffix: &[u8]) -> Result<[u8; 4]>

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fn decode_flags(&self, suffix: &[u8]) -> Result<Flags>

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fn decode_payload_size(&self, suffix: &[u8]) -> Result<u64>

Auto Trait Implementations§

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impl<R> Freeze for PuffinFileFooterReader<R>
where R: Freeze,

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impl<R> RefUnwindSafe for PuffinFileFooterReader<R>
where R: RefUnwindSafe,

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impl<R> Send for PuffinFileFooterReader<R>
where R: Send,

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impl<R> Sync for PuffinFileFooterReader<R>
where R: Sync,

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impl<R> Unpin for PuffinFileFooterReader<R>
where R: Unpin,

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impl<R> UnwindSafe for PuffinFileFooterReader<R>
where R: UnwindSafe,

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