buffer-compression/com.ditchoom.buffer.compression

Package-level declarations

Types

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sealed interface BufferAllocator

Strategy for allocating buffers during compression/decompression. Allows control over memory allocation to optimize for different use cases.

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sealed interface CompressionAlgorithm

Compression algorithm types.

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class CompressionException(message: String, cause: Throwable? = null) : Exception

Exception thrown when compression/decompression fails.

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sealed interface CompressionLevel

Compression level.

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sealed interface CompressionResult

Result of compression/decompression operations.

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object DeflateFormat

Deflate format constants.

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interface StreamingCompressor : AutoCloseable

Stateful streaming compressor that processes data incrementally. Useful for compressing data that arrives in chunks (e.g., from network).

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interface StreamingDecompressor : AutoCloseable

Stateful streaming decompressor that processes data incrementally.

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interface SuspendingStreamingCompressor : AutoCloseable

Suspending streaming compressor for async-only platforms. Browser JavaScript requires this variant since CompressionStream is async.

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interface SuspendingStreamingDecompressor : AutoCloseable

Suspending streaming decompressor for async-only platforms.

Properties

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actual val supportsRawDeflate: Boolean = true
expect val supportsRawDeflate: Boolean

Whether the current platform supports raw deflate (no zlib/gzip headers).

actual val supportsRawDeflate: Boolean
actual val supportsRawDeflate: Boolean = true
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actual val supportsStatefulFlush: Boolean = true
expect val supportsStatefulFlush: Boolean

Whether the sync StreamingCompressor maintains compression state across flush() calls.

actual val supportsStatefulFlush: Boolean = false

Whether the sync StreamingCompressor maintains dictionary across flush() calls.

actual val supportsStatefulFlush: Boolean = true
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actual val supportsSyncCompression: Boolean = true

Apple supports synchronous compression via system zlib.

expect val supportsSyncCompression: Boolean

Whether this platform supports the synchronous compress and decompress functions.

actual val supportsSyncCompression: Boolean

JS supports synchronous compression only in Node.js via native zlib module. Browser only has async CompressionStream API - use SuspendingStreamingCompressor instead.

actual val supportsSyncCompression: Boolean = true

JVM/Android supports synchronous compression via java.util.zip.

Functions

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actual fun compress(buffer: ReadBuffer, algorithm: CompressionAlgorithm, level: CompressionLevel): CompressionResult

Apple implementation using system zlib with direct buffer access.

expect fun compress(buffer: ReadBuffer, algorithm: CompressionAlgorithm = CompressionAlgorithm.Deflate, level: CompressionLevel = CompressionLevel.Default): CompressionResult

Compresses data from a ReadBuffer using the specified algorithm. Reads from current position to limit.

actual fun compress(buffer: ReadBuffer, algorithm: CompressionAlgorithm, level: CompressionLevel): CompressionResult

JS implementation using native Node.js zlib. Browser throws UnsupportedOperationException - use streaming API instead.

actual fun compress(buffer: ReadBuffer, algorithm: CompressionAlgorithm, level: CompressionLevel): CompressionResult

JVM/Android implementation delegating to streaming compression.

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suspend fun compressAsync(buffer: ReadBuffer, algorithm: CompressionAlgorithm = CompressionAlgorithm.Gzip, level: CompressionLevel = CompressionLevel.Default, zone: AllocationZone = AllocationZone.Direct): PlatformBuffer

Compresses data using the specified algorithm. Works on all platforms.

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suspend fun compressWithSyncFlush(buffer: ReadBuffer, level: CompressionLevel = CompressionLevel.Default, zone: AllocationZone = AllocationZone.Direct): ReadBuffer

Compresses data using Z_SYNC_FLUSH and strips the sync marker.

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actual fun SuspendingStreamingDecompressor.Companion.create(algorithm: CompressionAlgorithm, allocator: BufferAllocator): SuspendingStreamingDecompressor
actual fun SuspendingStreamingCompressor.Companion.create(algorithm: CompressionAlgorithm, level: CompressionLevel, allocator: BufferAllocator): SuspendingStreamingCompressor
actual fun StreamingCompressor.Companion.create(algorithm: CompressionAlgorithm, level: CompressionLevel, allocator: BufferAllocator, outputBufferSize: Int): StreamingCompressor

Apple streaming compressor factory using z_stream for true incremental compression.

actual fun StreamingDecompressor.Companion.create(algorithm: CompressionAlgorithm, allocator: BufferAllocator, outputBufferSize: Int, expectedSize: Int): StreamingDecompressor

Apple streaming decompressor factory using z_stream for true incremental decompression.

expect fun SuspendingStreamingDecompressor.Companion.create(algorithm: CompressionAlgorithm = CompressionAlgorithm.Deflate, allocator: BufferAllocator = BufferAllocator.Default): SuspendingStreamingDecompressor

Creates a suspending streaming decompressor.

expect fun SuspendingStreamingCompressor.Companion.create(algorithm: CompressionAlgorithm = CompressionAlgorithm.Deflate, level: CompressionLevel = CompressionLevel.Default, allocator: BufferAllocator = BufferAllocator.Default): SuspendingStreamingCompressor

Creates a suspending streaming compressor. Required for browser JavaScript which only supports async CompressionStream.

expect fun StreamingCompressor.Companion.create(algorithm: CompressionAlgorithm = CompressionAlgorithm.Deflate, level: CompressionLevel = CompressionLevel.Default, allocator: BufferAllocator = BufferAllocator.Default, outputBufferSize: Int = 32768): StreamingCompressor

Creates a streaming compressor.

expect fun StreamingDecompressor.Companion.create(algorithm: CompressionAlgorithm = CompressionAlgorithm.Deflate, allocator: BufferAllocator = BufferAllocator.Default, outputBufferSize: Int = 32768, expectedSize: Int = 0): StreamingDecompressor

Creates a streaming decompressor.

actual fun SuspendingStreamingDecompressor.Companion.create(algorithm: CompressionAlgorithm, allocator: BufferAllocator): SuspendingStreamingDecompressor

JS suspending streaming decompressor factory. Node.js: uses Transform stream API for stateful decompression. Browser: uses native DecompressionStream API.

actual fun SuspendingStreamingCompressor.Companion.create(algorithm: CompressionAlgorithm, level: CompressionLevel, allocator: BufferAllocator): SuspendingStreamingCompressor

JS suspending streaming compressor factory. Node.js: uses Transform stream API for stateful compression with flush support. Browser: uses native CompressionStream API (no flush support).

actual fun StreamingCompressor.Companion.create(algorithm: CompressionAlgorithm, level: CompressionLevel, allocator: BufferAllocator, outputBufferSize: Int): StreamingCompressor

JS streaming compressor factory. Node.js: uses native zlib sync APIs. Browser: throws UnsupportedOperationException (use SuspendingStreamingCompressor instead).

actual fun StreamingDecompressor.Companion.create(algorithm: CompressionAlgorithm, allocator: BufferAllocator, outputBufferSize: Int, expectedSize: Int): StreamingDecompressor

JS streaming decompressor factory. Node.js: uses native zlib sync APIs. Browser: throws UnsupportedOperationException (use SuspendingStreamingDecompressor instead).

actual fun SuspendingStreamingDecompressor.Companion.create(algorithm: CompressionAlgorithm, allocator: BufferAllocator): SuspendingStreamingDecompressor
actual fun SuspendingStreamingCompressor.Companion.create(algorithm: CompressionAlgorithm, level: CompressionLevel, allocator: BufferAllocator): SuspendingStreamingCompressor
actual fun StreamingCompressor.Companion.create(algorithm: CompressionAlgorithm, level: CompressionLevel, allocator: BufferAllocator, outputBufferSize: Int): StreamingCompressor
actual fun StreamingDecompressor.Companion.create(algorithm: CompressionAlgorithm, allocator: BufferAllocator, outputBufferSize: Int, expectedSize: Int): StreamingDecompressor
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actual fun decompress(buffer: ReadBuffer, algorithm: CompressionAlgorithm): CompressionResult
expect fun decompress(buffer: ReadBuffer, algorithm: CompressionAlgorithm = CompressionAlgorithm.Deflate): CompressionResult

Decompresses data from a ReadBuffer using the specified algorithm. Reads from current position to limit.

actual fun decompress(buffer: ReadBuffer, algorithm: CompressionAlgorithm): CompressionResult
actual fun decompress(buffer: ReadBuffer, algorithm: CompressionAlgorithm): CompressionResult
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fun StreamProcessorBuilder.decompress(algorithm: CompressionAlgorithm = CompressionAlgorithm.Gzip, allocator: BufferAllocator = BufferAllocator.Default): StreamProcessorBuilder

Adds decompression to the StreamProcessor pipeline.

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suspend fun decompressAsync(buffer: ReadBuffer, algorithm: CompressionAlgorithm = CompressionAlgorithm.Gzip, zone: AllocationZone = AllocationZone.Direct, expectedOutputSize: Int = 0): PlatformBuffer

Decompresses data using the specified algorithm. Works on all platforms.

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suspend fun decompressWithSyncFlush(buffer: ReadBuffer, zone: AllocationZone = AllocationZone.Direct): ReadBuffer

Decompresses data that was compressed with compressWithSyncFlush.

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fun CompressionResult.getOrNull(): PlatformBuffer?

Extension function to get buffer from CompressionResult, returning null on failure.

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fun CompressionResult.getOrThrow(): PlatformBuffer

Extension function to get buffer from CompressionResult, throwing on failure.

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fun ReadBuffer.stripSyncFlushMarker(): ReadBuffer

Strips the Z_SYNC_FLUSH marker (00 00 FF FF) from the end of compressed data.

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inline suspend fun <R> SuspendingStreamingCompressor.use(block: (compress: suspend (ReadBuffer) -> List<ReadBuffer>) -> R): R

Convenience function that handles compress, finish, and close automatically. Returns all output chunks (from both compress and finish calls).

inline suspend fun <R> SuspendingStreamingDecompressor.use(block: (decompress: suspend (ReadBuffer) -> List<ReadBuffer>) -> R): R
inline fun <R> StreamingDecompressor.use(noinline onOutput: (ReadBuffer) -> Unit, block: (decompress: (ReadBuffer) -> Unit) -> R): R

Convenience function that handles decompress, finish, and close automatically.

inline fun <R> StreamingCompressor.use(noinline onOutput: (ReadBuffer) -> Unit, block: (compress: (ReadBuffer) -> Unit) -> R): R

Convenience function that handles compress, finish, and close automatically. All output chunks (from both compress and finish) go to the same callback.

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inline suspend fun <R> StreamingCompressor.useSuspending(noinline onOutput: (ReadBuffer) -> Unit, block: suspend (compress: (ReadBuffer) -> Unit) -> R): R

Suspending version of use for use with suspending I/O. Uses the efficient synchronous compressor but allows suspend calls in the block.

inline suspend fun <R> StreamingDecompressor.useSuspending(noinline onOutput: (ReadBuffer) -> Unit, block: suspend (decompress: (ReadBuffer) -> Unit) -> R): R

Suspending version of use for use with suspending I/O.

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