class LZ4Writer

Declaration

class LZ4Writer : public IChunkWriter { /* full declaration omitted */ };

Description

An in-memory IChunkWriter implementation that holds data in a temporary buffer before flushing to an LZ4-compressed buffer.

Declared at: mcap/include/mcap/writer.hpp:271

Inherits from: IChunkWriter

Member Variables

Inherited from IWritable:

public crcEnabled = false

Method Overview

• public LZ4Writer(mcap::CompressionLevel compressionLevel, uint64_t chunkSize)
• public const std::byte * compressedData() const
• public uint64_t compressedSize() const
• public const std::byte * data() const
• public bool empty() const
• public void end()
• public void handleClear()
• public void handleWrite(const std::byte * data, uint64_t size)
• public uint64_t size() const

Inherited from IChunkWriter:

• public clear
• public compressedData
• public compressedSize
• public data
• public empty
• public end
• protected handleClear
• public size

Inherited from IWritable:

• public crc
• public end
• public flush
• protected handleWrite
• public resetCrc
• public size
• public write

Methods

¶LZ4Writer(mcap::CompressionLevel compressionLevel,
          uint64_t chunkSize)

Declared at: mcap/include/mcap/writer.hpp:273

Parameters

mcap::CompressionLevel compressionLevel

uint64_t chunkSize

¶const std::byte* compressedData() const

Description

Returns a pointer to the compressed data. This will only be called after `end()`.

Declared at: mcap/include/mcap/writer.hpp:282

¶uint64_t compressedSize() const

Description

Returns the size in bytes of the compressed data. This will only be called after `end()`.

Declared at: mcap/include/mcap/writer.hpp:278

¶const std::byte* data() const

Description

Returns a pointer to the uncompressed data.

Declared at: mcap/include/mcap/writer.hpp:281

¶bool empty() const

Description

Returns true if `write()` has never been called since initialization or the last call to `clear()`.

Declared at: mcap/include/mcap/writer.hpp:279

¶void end()

Description

Called when the writer wants to close the current output Chunk. After this call, `data()` and `size()` should return the data and size of the compressed data.

Declared at: mcap/include/mcap/writer.hpp:276

¶void handleClear()

Declared at: mcap/include/mcap/writer.hpp:280

¶void handleWrite(const std::byte* data,
                 uint64_t size)

Declared at: mcap/include/mcap/writer.hpp:275

Parameters

const std::byte* data

uint64_t size

¶uint64_t size() const

Description

Returns the size in bytes of the uncompressed data.

Declared at: mcap/include/mcap/writer.hpp:277