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bulk.go
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bulk.go
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package bdb
import "C"
type BulkData struct {
bytes []byte
offset int
index int
}
func NewBulkWriter(bytes []byte) *BulkData {
putUint32(bytes[len(bytes) - 4:], 1 << 32 - 1)
return &BulkData{bytes, 0, len(bytes) - 4}
}
func (d *BulkData) Write(bytes []byte) bool {
if d.offset + len(bytes) > d.index - 8 { return false }
putUint32(d.bytes[d.index:], uint32(d.offset))
d.index -= 4
putUint32(d.bytes[d.index:], uint32(len(bytes)))
d.index -= 4
putUint32(d.bytes[d.index:], 1 << 32 - 1)
copy(d.bytes[d.offset:], bytes)
d.offset += len(bytes)
return true
}
func (d *BulkData) WriteString(s string) bool {
return d.Write([]byte(s))
}
/* func makeDBT(items [][]byte) []byte {
slen := 0
for _, item := range items { slen += len(item) }
// println("slen =", slen)
bytes := make([]byte, slen + len(items) * 4 * 2 + 4)
index := len(bytes)
offset := 0
for _, item := range items {
copy(bytes[offset:], item)
offset += len(item)
}
index -= 4
putUint32(bytes[index:], (1 << 32 - 1))
// fmt.Println("bytes =", bytes)
return bytes
} */
/* func (d DB) PutBulk(keys [][]byte, values [][]byte) {
keysBytes := makeDBT(keys)
valuesBytes := makeDBT(values)
check(C.db_put((*C.DB)(d.p),
(*C.DB_TXN)(nil),
&C.DBT{data: unsafe.Pointer(&keysBytes[0]), ulen: C.u_int32_t(len(keysBytes)),
flags: C.DB_DBT_BULK},
&C.DBT{data: unsafe.Pointer(&valuesBytes[0]), ulen: C.u_int32_t(len(valuesBytes)),
flags: C.DB_DBT_BULK},
C.DB_MULTIPLE))
} */
/* func (d DB) PutBulk(keys []byte, values []byte) {
check(C.db_put((*C.DB)(d.p),
(*C.DB_TXN)(nil),
&C.DBT{data: unsafe.Pointer(&keys[0]), ulen: C.u_int32_t(len(keys)),
flags: C.DB_DBT_BULK},
&C.DBT{data: unsafe.Pointer(&values[0]), ulen: C.u_int32_t(len(values)),
flags: C.DB_DBT_BULK},
C.DB_MULTIPLE))
} */