172 lines
3.4 KiB
Go
172 lines
3.4 KiB
Go
// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package keys
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import (
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"bufio"
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"encoding/binary"
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"io"
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"time"
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)
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type reader struct {
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*bufio.Reader
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}
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func newReader(r io.Reader) *reader {
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return &reader{
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bufio.NewReader(r),
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}
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}
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func (b *reader) ReadNext(exp byte) (fnd bool) {
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byt, _ := b.ReadByte()
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if exp == byt {
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return true
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}
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b.UnreadByte()
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return false
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}
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func (b *reader) ReadUpto(exp byte) (byt []byte) {
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byt, _ = b.ReadBytes(exp)
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b.UnreadByte()
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return byt[:len(byt)-1]
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}
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// --------------------------------------------------
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// --------------------------------------------------
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// --------------------------------------------------
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// --------------------------------------------------
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// --------------------------------------------------
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func (r *reader) FindNext() (byt byte) {
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byt, _ = r.ReadByte()
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r.UnreadByte()
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return
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}
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func (r *reader) FindNull() (val interface{}) {
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if r.ReadNext(cNILL) {
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r.ReadNext(cTERM)
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return
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}
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return
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}
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func (r *reader) FindTime() (val time.Time) {
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if r.ReadNext(cTIME) {
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var out int64
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binary.Read(r.Reader, binary.BigEndian, &out)
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val = time.Unix(0, out).UTC()
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r.ReadNext(cTERM)
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return
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}
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return
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}
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func (r *reader) FindBool() (val bool) {
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if r.ReadNext(cBOOL) {
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val = r.ReadNext(cBOOL)
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r.ReadNext(cTERM)
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return
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}
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return
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}
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func (r *reader) FindBytes() (val []byte) {
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if r.ReadNext(cSTRING) {
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val = r.ReadUpto(cTERM)
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r.ReadNext(cTERM)
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return
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}
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return
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}
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func (r *reader) FindString() (val string) {
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if r.ReadNext(cPREFIX) {
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val = Prefix
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r.ReadNext(cTERM)
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return
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}
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if r.ReadNext(cSUFFIX) {
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val = Suffix
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r.ReadNext(cTERM)
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return
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}
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if r.ReadNext(cSTRING) {
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val = string(r.ReadUpto(cTERM))
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r.ReadNext(cTERM)
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return
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}
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return
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}
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func (r *reader) FindNumber() (val int64) {
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if r.ReadNext(cNUMBER) {
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binary.Read(r.Reader, binary.BigEndian, &val)
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r.ReadNext(cTERM)
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return
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}
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return
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}
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func (r *reader) FindNumberInt() (val int) {
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return int(r.FindNumber())
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}
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func (r *reader) FindNumberInt8() (val int8) {
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return int8(r.FindNumber())
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}
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func (r *reader) FindNumberInt16() (val int16) {
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return int16(r.FindNumber())
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}
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func (r *reader) FindNumberInt32() (val int32) {
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return int32(r.FindNumber())
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}
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func (r *reader) FindNumberInt64() (val int64) {
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return int64(r.FindNumber())
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}
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func (r *reader) FindNumberUint() (val uint) {
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return uint(r.FindNumber())
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}
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func (r *reader) FindNumberUint8() (val uint8) {
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return uint8(r.FindNumber())
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}
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func (r *reader) FindNumberUint16() (val uint16) {
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return uint16(r.FindNumber())
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}
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func (r *reader) FindNumberUint32() (val uint32) {
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return uint32(r.FindNumber())
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}
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func (r *reader) FindNumberUint64() (val uint64) {
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return uint64(r.FindNumber())
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}
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func (r *reader) FindNumberFloat32() (val float32) {
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return float32(r.FindNumber())
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}
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func (r *reader) FindNumberFloat64() (val float64) {
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return float64(r.FindNumber())
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}
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