mirror of
https://github.com/go-gitea/gitea
synced 2024-11-09 03:34:24 +00:00
117 lines
2.9 KiB
Go
Vendored
117 lines
2.9 KiB
Go
Vendored
// Copyright (c) 2019 Couchbase, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package zap
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
)
|
|
|
|
type chunkedIntDecoder struct {
|
|
startOffset uint64
|
|
dataStartOffset uint64
|
|
chunkOffsets []uint64
|
|
curChunkBytes []byte
|
|
data []byte
|
|
r *memUvarintReader
|
|
}
|
|
|
|
// newChunkedIntDecoder expects an optional or reset chunkedIntDecoder for better reuse.
|
|
func newChunkedIntDecoder(buf []byte, offset uint64, rv *chunkedIntDecoder) *chunkedIntDecoder {
|
|
if rv == nil {
|
|
rv = &chunkedIntDecoder{startOffset: offset, data: buf}
|
|
} else {
|
|
rv.startOffset = offset
|
|
rv.data = buf
|
|
}
|
|
|
|
var n, numChunks uint64
|
|
var read int
|
|
if offset == termNotEncoded {
|
|
numChunks = 0
|
|
} else {
|
|
numChunks, read = binary.Uvarint(buf[offset+n : offset+n+binary.MaxVarintLen64])
|
|
}
|
|
|
|
n += uint64(read)
|
|
if cap(rv.chunkOffsets) >= int(numChunks) {
|
|
rv.chunkOffsets = rv.chunkOffsets[:int(numChunks)]
|
|
} else {
|
|
rv.chunkOffsets = make([]uint64, int(numChunks))
|
|
}
|
|
for i := 0; i < int(numChunks); i++ {
|
|
rv.chunkOffsets[i], read = binary.Uvarint(buf[offset+n : offset+n+binary.MaxVarintLen64])
|
|
n += uint64(read)
|
|
}
|
|
rv.dataStartOffset = offset + n
|
|
return rv
|
|
}
|
|
|
|
func (d *chunkedIntDecoder) loadChunk(chunk int) error {
|
|
if d.startOffset == termNotEncoded {
|
|
d.r = newMemUvarintReader([]byte(nil))
|
|
return nil
|
|
}
|
|
|
|
if chunk >= len(d.chunkOffsets) {
|
|
return fmt.Errorf("tried to load freq chunk that doesn't exist %d/(%d)",
|
|
chunk, len(d.chunkOffsets))
|
|
}
|
|
|
|
end, start := d.dataStartOffset, d.dataStartOffset
|
|
s, e := readChunkBoundary(chunk, d.chunkOffsets)
|
|
start += s
|
|
end += e
|
|
d.curChunkBytes = d.data[start:end]
|
|
if d.r == nil {
|
|
d.r = newMemUvarintReader(d.curChunkBytes)
|
|
} else {
|
|
d.r.Reset(d.curChunkBytes)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (d *chunkedIntDecoder) reset() {
|
|
d.startOffset = 0
|
|
d.dataStartOffset = 0
|
|
d.chunkOffsets = d.chunkOffsets[:0]
|
|
d.curChunkBytes = d.curChunkBytes[:0]
|
|
d.data = d.data[:0]
|
|
if d.r != nil {
|
|
d.r.Reset([]byte(nil))
|
|
}
|
|
}
|
|
|
|
func (d *chunkedIntDecoder) isNil() bool {
|
|
return d.curChunkBytes == nil || len(d.curChunkBytes) == 0
|
|
}
|
|
|
|
func (d *chunkedIntDecoder) readUvarint() (uint64, error) {
|
|
return d.r.ReadUvarint()
|
|
}
|
|
|
|
func (d *chunkedIntDecoder) SkipUvarint() {
|
|
d.r.SkipUvarint()
|
|
}
|
|
|
|
func (d *chunkedIntDecoder) SkipBytes(count int) {
|
|
d.r.SkipBytes(count)
|
|
}
|
|
|
|
func (d *chunkedIntDecoder) Len() int {
|
|
return d.r.Len()
|
|
}
|