object compression
Provides utilities for compressing/decompressing byte streams.
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- compression.scala
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sealed
trait
DeflateParams extends AnyRef
Deflate algorithm parameters.
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final
case class
GunzipResult[F[_]](content: Stream[F, Byte], modificationTime: Option[Instant] = None, fileName: Option[String] = None, comment: Option[String] = None) extends Product with Serializable
Gunzip decompression results including file properties and decompressed content stream, used as follows: stream .through(gunzip[IO]()) .flatMap { gunzipResult => // Access properties here.
Gunzip decompression results including file properties and decompressed content stream, used as follows: stream .through(gunzip[IO]()) .flatMap { gunzipResult => // Access properties here. gunzipResult.content }
- content
Uncompressed content stream.
- modificationTime
Modification time of compressed file.
- fileName
File name.
- comment
File comment.
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sealed
trait
InflateParams extends AnyRef
Inflate algorithm parameters.
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def
deflate[F[_]](deflateParams: DeflateParams)(implicit SyncF: Sync[F]): Pipe[F, Byte, Byte]
Returns a
Pipe
that deflates (compresses) its input elements using the the Deflate algorithm.Returns a
Pipe
that deflates (compresses) its input elements using the the Deflate algorithm.- deflateParams
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def
gunzip[F[_]](inflateParams: InflateParams)(implicit SyncF: Sync[F]): (Stream[F, Byte]) ⇒ Stream[F, GunzipResult[F]]
Returns a pipe that incrementally decompresses input according to the GZIP format as defined by RFC 1952 at https://www.ietf.org/rfc/rfc1952.txt.
Returns a pipe that incrementally decompresses input according to the GZIP format as defined by RFC 1952 at https://www.ietf.org/rfc/rfc1952.txt. Any errors in decompression will be sequenced as exceptions into the output stream. Decompression is handled in a streaming and async fashion without any thread blockage.
The chunk size here is actually really important. Matching the input stream largest chunk size, or roughly 8 KB (whichever is larger) is a good rule of thumb.
- inflateParams
- returns
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def
gunzip[F[_]](bufferSize: Int = 1024 * 32)(implicit SyncF: Sync[F]): (Stream[F, Byte]) ⇒ Stream[F, GunzipResult[F]]
Returns a pipe that incrementally decompresses input according to the GZIP format as defined by RFC 1952 at https://www.ietf.org/rfc/rfc1952.txt.
Returns a pipe that incrementally decompresses input according to the GZIP format as defined by RFC 1952 at https://www.ietf.org/rfc/rfc1952.txt. Any errors in decompression will be sequenced as exceptions into the output stream. Decompression is handled in a streaming and async fashion without any thread blockage.
The chunk size here is actually really important. Matching the input stream largest chunk size, or roughly 8 KB (whichever is larger) is a good rule of thumb.
- bufferSize
The bounding size of the input buffer. This should roughly match the size of the largest chunk in the input stream. This will also be the chunk size in the output stream. Default size is 32 KB.
- returns
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def
gzip[F[_]](fileName: Option[String], modificationTime: Option[Instant], comment: Option[String], deflateParams: DeflateParams)(implicit SyncF: Sync[F]): Pipe[F, Byte, Byte]
Returns a pipe that incrementally compresses input into the GZIP format as defined by RFC 1952 at https://www.ietf.org/rfc/rfc1952.txt.
Returns a pipe that incrementally compresses input into the GZIP format as defined by RFC 1952 at https://www.ietf.org/rfc/rfc1952.txt. Output is compatible with the GNU utils
gunzip
utility, as well as really anything else that understands GZIP. Note, however, that the GZIP format is not "stable" in the sense that all compressors will produce identical output given identical input. Part of the header seeding is arbitrary and chosen by the compression implementation. For this reason, the exact bytes produced by this pipe will differ in insignificant ways from the exact bytes produced by a tool like the GNU utilsgzip
.GZIP wraps a deflate stream with file attributes and stream integrity validation. Therefore, GZIP is a good choice for compressing finite, complete, readily-available, continuous or file streams. A simpler deflate stream may be better suited to real-time, intermittent, fragmented, interactive or discontinuous streams where network protocols typically provide stream integrity validation.
- fileName
optional file name
- modificationTime
optional file modification time
- comment
optional file comment
- deflateParams
-
def
gzip[F[_]](bufferSize: Int = 1024 * 32, deflateLevel: Option[Int] = None, deflateStrategy: Option[Int] = None, modificationTime: Option[Instant] = None, fileName: Option[String] = None, comment: Option[String] = None)(implicit SyncF: Sync[F]): Pipe[F, Byte, Byte]
Returns a pipe that incrementally compresses input into the GZIP format as defined by RFC 1952 at https://www.ietf.org/rfc/rfc1952.txt.
Returns a pipe that incrementally compresses input into the GZIP format as defined by RFC 1952 at https://www.ietf.org/rfc/rfc1952.txt. Output is compatible with the GNU utils
gunzip
utility, as well as really anything else that understands GZIP. Note, however, that the GZIP format is not "stable" in the sense that all compressors will produce identical output given identical input. Part of the header seeding is arbitrary and chosen by the compression implementation. For this reason, the exact bytes produced by this pipe will differ in insignificant ways from the exact bytes produced by a tool like the GNU utilsgzip
.GZIP wraps a deflate stream with file attributes and stream integrity validation. Therefore, GZIP is a good choice for compressing finite, complete, readily-available, continuous or file streams. A simpler deflate stream may be better suited to real-time, intermittent, fragmented, interactive or discontinuous streams where network protocols typically provide stream integrity validation.
- bufferSize
The buffer size which will be used to page data into chunks. This will be the chunk size of the output stream. You should set it to be equal to the size of the largest chunk in the input stream. Setting this to a size which is smaller than the chunks in the input stream will result in performance degradation of roughly 50-75%. Default size is 32 KB.
- deflateLevel
level the compression level (0-9)
- deflateStrategy
strategy compression strategy -- see
java.util.zip.Deflater
for details- modificationTime
optional file modification time
- fileName
optional file name
- comment
optional file comment
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def
hashCode(): Int
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def
inflate[F[_]](inflateParams: InflateParams)(implicit SyncF: Sync[F]): Pipe[F, Byte, Byte]
Returns a
Pipe
that inflates (decompresses) its input elements using ajava.util.zip.Inflater
with the parameternowrap
.Returns a
Pipe
that inflates (decompresses) its input elements using ajava.util.zip.Inflater
with the parameternowrap
.- inflateParams
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- object DeflateParams
- object InflateParams
- object ZLibParams
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