forked from mirror/ledisdb
71 lines
1.3 KiB
Go
71 lines
1.3 KiB
Go
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// +build leveldb
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package leveldb
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// #cgo LDFLAGS: -lleveldb
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// #include <stdlib.h>
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// #include "leveldb/c.h"
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// #include "leveldb_ext.h"
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import "C"
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import (
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"unsafe"
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)
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type Iterator struct {
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it *C.leveldb_iterator_t
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isValid C.uchar
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}
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func (it *Iterator) Key() []byte {
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var klen C.size_t
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kdata := C.leveldb_iter_key(it.it, &klen)
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if kdata == nil {
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return nil
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}
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return slice(unsafe.Pointer(kdata), int(C.int(klen)))
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}
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func (it *Iterator) Value() []byte {
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var vlen C.size_t
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vdata := C.leveldb_iter_value(it.it, &vlen)
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if vdata == nil {
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return nil
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}
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return slice(unsafe.Pointer(vdata), int(C.int(vlen)))
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}
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func (it *Iterator) Close() error {
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if it.it != nil {
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C.leveldb_iter_destroy(it.it)
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it.it = nil
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}
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return nil
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}
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func (it *Iterator) Valid() bool {
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return ucharToBool(it.isValid)
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}
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func (it *Iterator) Next() {
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it.isValid = C.leveldb_iter_next_ext(it.it)
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}
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func (it *Iterator) Prev() {
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it.isValid = C.leveldb_iter_prev_ext(it.it)
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}
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func (it *Iterator) First() {
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it.isValid = C.leveldb_iter_seek_to_first_ext(it.it)
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}
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func (it *Iterator) Last() {
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it.isValid = C.leveldb_iter_seek_to_last_ext(it.it)
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}
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func (it *Iterator) Seek(key []byte) {
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it.isValid = C.leveldb_iter_seek_ext(it.it, (*C.char)(unsafe.Pointer(&key[0])), C.size_t(len(key)))
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}
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