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lzma.go
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lzma.go
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package lzma
//#include <stdlib.h>
//#include <strings.h>
//#include "lzma.h"
import "C"
import (
"errors"
"unsafe"
)
func Uncompress(src []byte) ([]byte, error) {
l := len(src)
if l == 0 {
return nil, errors.New("src data error")
}
var srcptr *C.char = (*C.char)(unsafe.Pointer(&src[0]))
var srclen C.int = C.int(C.cxLzmaGetUncompressLen(unsafe.Pointer(srcptr)))
var ret []byte = make([]byte, int(srclen))
var dstptr *C.char = (*C.char)(unsafe.Pointer(&ret[0]))
if C.cxLzmaUncompress(srcptr, C.int(l), dstptr, &srclen) == nil {
return nil, errors.New("uncompress failed")
}
return ret, nil
}
func Compress(src []byte, level ...int) ([]byte, error) {
l := len(src)
if l == 0 {
return nil, errors.New("src data error")
}
lv := 5
if len(level) > 0 {
lv = level[0]
}
var srcptr *C.char = (*C.char)(unsafe.Pointer(&src[0]))
var srclen C.int = C.int(C.cxLzmaGetCompressLen(C.int(l)))
var ret []byte = make([]byte, int(srclen))
var dstptr *C.char = (*C.char)(unsafe.Pointer(&ret[0]))
if C.cxLzmaCompress(srcptr, C.int(l), dstptr, &srclen, C.int(lv)) == nil {
return nil, errors.New("compress failed")
}
return ret[0:int(srclen)], nil
}