mirror of
https://github.com/astaxie/beego.git
synced 2024-12-24 00:20:50 +00:00
39 lines
1.3 KiB
Go
39 lines
1.3 KiB
Go
package lz4
|
|
|
|
// #cgo CFLAGS: -O3
|
|
// #include "src/lz4hc.h"
|
|
// #include "src/lz4hc.c"
|
|
import "C"
|
|
|
|
import (
|
|
"fmt"
|
|
)
|
|
|
|
// CompressHC compresses in and puts the content in out. len(out)
|
|
// should have enough space for the compressed data (use CompressBound
|
|
// to calculate). Returns the number of bytes in the out slice. Determines
|
|
// the compression level automatically.
|
|
func CompressHC(in, out []byte) (int, error) {
|
|
// 0 automatically sets the compression level.
|
|
return CompressHCLevel(in, out, 0)
|
|
}
|
|
|
|
// CompressHCLevel compresses in at the given compression level and puts the
|
|
// content in out. len(out) should have enough space for the compressed data
|
|
// (use CompressBound to calculate). Returns the number of bytes in the out
|
|
// slice. To automatically choose the compression level, use 0. Otherwise, use
|
|
// any value in the inclusive range 1 (worst) through 16 (best). Most
|
|
// applications will prefer CompressHC.
|
|
func CompressHCLevel(in, out []byte, level int) (outSize int, err error) {
|
|
// LZ4HC does not handle empty buffers. Pass through to Compress.
|
|
if len(in) == 0 || len(out) == 0 {
|
|
return Compress(in, out)
|
|
}
|
|
|
|
outSize = int(C.LZ4_compressHC2_limitedOutput(p(in), p(out), clen(in), clen(out), C.int(level)))
|
|
if outSize == 0 {
|
|
err = fmt.Errorf("insufficient space for compression")
|
|
}
|
|
return
|
|
}
|