forked from mirror/ledisdb
53 lines
1.1 KiB
Go
53 lines
1.1 KiB
Go
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package mdb
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/*
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#cgo CFLAGS: -pthread -W -Wall -Wno-unused-parameter -Wbad-function-cast -O2 -g
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#cgo CFLAGS: -I/usr/local
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#include <stdlib.h>
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#include <stdio.h>
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#include "lmdb.h"
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*/
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import "C"
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import (
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"reflect"
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"unsafe"
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)
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// MDB_val
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type Val C.MDB_val
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// Create a Val that points to p's data. the Val's data must not be freed
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// manually and C references must not survive the garbage collection of p (and
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// the returned Val).
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func Wrap(p []byte) Val {
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if len(p) == 0 {
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return Val(C.MDB_val{})
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}
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return Val(C.MDB_val{
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mv_size: C.size_t(len(p)),
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mv_data: unsafe.Pointer(&p[0]),
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})
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}
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// If val is nil, a empty slice is retured.
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func (val Val) Bytes() []byte {
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return C.GoBytes(val.mv_data, C.int(val.mv_size))
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}
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// If val is nil, a empty slice is retured.
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func (val Val) BytesNoCopy() []byte {
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hdr := reflect.SliceHeader{
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Data: uintptr(unsafe.Pointer(val.mv_data)),
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Len: int(val.mv_size),
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Cap: int(val.mv_size),
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}
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return *(*[]byte)(unsafe.Pointer(&hdr))
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}
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// If val is nil, an empty string is returned.
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func (val Val) String() string {
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return C.GoStringN((*C.char)(val.mv_data), C.int(val.mv_size))
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}
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