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