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CompressedPageHeader

featherdb_storage::compression

Struct CompressedPageHeader 

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pub struct CompressedPageHeader {
    pub magic: u8,
    pub compression_type: u8,
    pub original_size: u32,
    pub compressed_size: u32,
    pub compression_level: u8,
    pub reserved: u8,
}
Expand description

Compressed page header stored at the beginning of compressed pages This is stored within the page data on disk

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§magic: u8

Magic byte to identify compressed pages (0xC0 = “CO” for compressed)

§compression_type: u8

Compression type (0=none, 1=lz4, 2=zstd)

§original_size: u32

Original uncompressed size (u32 to support up to 4GB pages)

§compressed_size: u32

Compressed data size (excluding this header)

§compression_level: u8

ZSTD compression level (only meaningful for ZSTD)

§reserved: u8

Reserved for future use

Implementations§

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impl CompressedPageHeader

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pub const MAGIC: u8 = 0xC0

Magic byte for compressed pages

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pub const SIZE: usize = 12

Header size in bytes

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pub fn new( compression_type: CompressionType, original_size: usize, compressed_size: usize, ) -> Self

Create a new compressed page header

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pub fn to_bytes(&self) -> [u8; 12]

Serialize header to bytes

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pub fn from_bytes(data: &[u8]) -> Option<Self>

Deserialize header from bytes

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pub fn get_compression_type(&self) -> CompressionType

Get the compression type enum

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pub fn is_valid(&self) -> bool

Check if this is a valid compressed page header

Trait Implementations§

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impl Clone for CompressedPageHeader

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fn clone(&self) -> CompressedPageHeader

Returns a duplicate of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for CompressedPageHeader

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Copy for CompressedPageHeader

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