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DeltaEncoding

scirs2_io::compression::advanced

Struct DeltaEncoding 

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pub struct DeltaEncoding;
Expand description

Delta encoding for sorted or slowly-varying numeric data.

The first value is stored verbatim; subsequent values store the difference from the previous value. This dramatically reduces entropy for monotonically sorted or slowly-varying integer or float sequences, making them highly compressible with a secondary compressor.

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impl DeltaEncoding

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pub fn encode_i64(data: &[i64]) -> Vec<u8> ⓘ

Encode a slice of i64 values as deltas.

The encoded format is [n:u64_le][v0:i64_le][d1:i64_le]...[dn-1:i64_le] where n is the number of elements.

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pub fn decode_i64(encoded: &[u8]) -> Result<Vec<i64>>

Decode delta-encoded i64 values.

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pub fn encode_f64(data: &[f64], scale: f64) -> Vec<u8> ⓘ

Encode a slice of f64 values as integer-quantised deltas.

Values are multiplied by scale and rounded to i64 before delta encoding. Decoding divides by scale to recover approximate floats.

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pub fn decode_f64(encoded: &[u8], scale: f64) -> Result<Vec<f64>>

Decode delta-encoded f64 values (inverse of encode_f64).

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