compressutil

Documentation

Index

• Constants
• func Compress(data []byte, config *CompressionConfig) ([]byte, error)
• func Decompress(data []byte) ([]byte, bool, error)
• type CompressionConfig

Constants

const (

	// Byte value used as canary when using Gzip format
	CompressionCanaryGzip byte = 'G'

	// Byte value used as canary when using Lzw format
	CompressionCanaryLzw byte = 'L'

	CompressionTypeLzw = "lzw"

	CompressionTypeGzip = "gzip"
)

Functions

func Compress

func Compress(data []byte, config *CompressionConfig) ([]byte, error)

Compress places the canary byte in a buffer and uses the same buffer to fill in the compressed information of the given input. The configuration supports two type of compression: LZW and Gzip. When using Gzip compression format, if GzipCompressionLevel is not specified, the 'gzip.DefaultCompression' will be assumed.

func Decompress

func Decompress(data []byte) ([]byte, bool, error)

Decompress checks if the first byte in the input matches the canary byte. If the first byte is a canary byte, then the input past the canary byte will be decompressed using the method specified in the given configuration. If the first byte isn't a canary byte, then the utility returns a boolean value indicating that the input was not compressed.

Types

type CompressionConfig

type CompressionConfig struct {
	// Type of the compression algorithm to be used
	Type string

	// When using Gzip format, the compression level to employ
	GzipCompressionLevel int
}

CompressionConfig is used to select a compression type to be performed by Compress and Decompress utilities. Supported types are: * CompressionTypeLzw * CompressionTypeGzip

When using CompressionTypeGzip, the compression levels can also be chosen: * gzip.DefaultCompression * gzip.BestSpeed * gzip.BestCompression