Struct Codec 

pub struct Codec { /* private fields */ }

Compression callbacks used by clickhouse-c.

Value is pinned because C code retains address of callback table.

Implementations

impl Codec

pub fn empty() -> Pin<Box<Self>>

Creates a codec without compression callbacks.

Codec only supports Compression::None until required callbacks are installed through raw_mut. Client::init rejects missing callbacks.

pub unsafe fn from_raw(raw: chc_codec) -> Pin<Box<Self>>

Creates a codec from a raw callback table.

Safety

Each function pointer must match corresponding field signature. All callbacks required by selected Compression must be present. User data referenced by ud must remain valid while codec exists and from every thread that uses codec.

pub fn lz4() -> Pin<Box<Self>>

Creates built-in LZ4 codec backed by system liblz4.

pub fn zstd() -> Pin<Box<Self>>

Creates built-in Zstandard codec backed by system libzstd.

pub unsafe fn raw_mut(self: Pin<&mut Self>) -> &mut chc_codec

Returns mutable access to raw callback table.

Safety

C library calls installed function pointers without validation.

• Each function pointer must match corresponding field signature.
• All callbacks required by selected Compression must be present. For example, LZ4 requires lz4_compress, lz4_decompress, and lz4_bound.
• Data referenced by ud must remain valid while codec exists and from every thread that uses codec.

Trait Implementations

impl Send for Codec