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44 lines
1.2 KiB
44 lines
1.2 KiB
8 years ago
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// Copyright 2015 PingCAP, Inc.
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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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package hack
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import (
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"reflect"
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"unsafe"
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)
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// String converts slice to string without copy.
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// Use at your own risk.
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func String(b []byte) (s string) {
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if len(b) == 0 {
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return ""
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}
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pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
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pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
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pstring.Data = pbytes.Data
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pstring.Len = pbytes.Len
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return
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}
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// Slice converts string to slice without copy.
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// Use at your own risk.
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func Slice(s string) (b []byte) {
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pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
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pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
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pbytes.Data = pstring.Data
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pbytes.Len = pstring.Len
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pbytes.Cap = pstring.Len
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return
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}
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