Compress a raw GZIP stream — deflate • zip

Compress a raw GZIP stream

Usage

deflate(buffer, level = 6L, pos = 1L, size = NULL)

Arguments

buffer: Raw vector, containing the data to compress.
level: Compression level, integer between 1 (fatest) and 9 (best).
pos: Start position of data to compress in buffer.
size: Compressed size estimate, or NULL. If not given, or too small, the output buffer is resized multiple times.

Value

Named list with three entries:

output: raw vector, the compressed data,
bytes_read: number of bytes used from buffer,
bytes_written: number of bytes written to the output buffer.

See also

base::memCompress() does the same with type = "gzip", but it does not tell you the number of bytes read from the input.

Examples

data_gz <- deflate(charToRaw("Hello world!"))
inflate(data_gz$output)
#> $output
#>  [1] 48 65 6c 6c 6f 20 77 6f 72 6c 64 21
#> 
#> $bytes_read
#> [1] 24
#> 
#> $bytes_written
#> [1] 12
#>