vendor: Add github.com/cznic/lldb and friends (new recursive dependency)
This commit is contained in:
Jakob Borg
27
vendor/github.com/cznic/internal/file/LICENSE
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27
vendor/github.com/cznic/internal/file/LICENSE
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Copyright (c) 2016 The Internal Authors. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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* Neither the names of the authors nor the names of the
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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434
vendor/github.com/cznic/internal/file/file.go
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434
vendor/github.com/cznic/internal/file/file.go
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// Copyright 2016 The Internal Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package file provides an os.File-like interface of a memory mapped file.
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package file
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import (
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"fmt"
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"io"
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"os"
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"time"
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"github.com/cznic/fileutil"
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"github.com/cznic/internal/buffer"
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"github.com/cznic/mathutil"
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"github.com/edsrzf/mmap-go"
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)
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const copyBufSize = 1 << 20 // 1 MB.
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var (
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_ Interface = (*mem)(nil)
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_ Interface = (*file)(nil)
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_ os.FileInfo = stat{}
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sysPage = os.Getpagesize()
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)
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// Interface is a os.File-like entity.
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type Interface interface {
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io.ReaderAt
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io.ReaderFrom
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io.WriterAt
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io.WriterTo
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Close() error
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Stat() (os.FileInfo, error)
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Sync() error
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Truncate(int64) error
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}
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// Open returns a new Interface backed by f, or an error, if any.
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func Open(f *os.File) (Interface, error) { return newFile(f, 1<<30, 20) }
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// OpenMem returns a new Interface, or an error, if any. The Interface content
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// is volatile, it's backed only by process' memory.
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func OpenMem(name string) (Interface, error) { return newMem(name, 18), nil }
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type memMap map[int64]*[]byte
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type mem struct {
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m memMap
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modTime time.Time
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name string
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pgBits uint
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pgMask int
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pgSize int
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size int64
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}
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func newMem(name string, pgBits uint) *mem {
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pgSize := 1 << pgBits
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return &mem{
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m: memMap{},
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modTime: time.Now(),
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name: name,
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pgBits: pgBits,
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pgMask: pgSize - 1,
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pgSize: pgSize,
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}
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}
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func (f *mem) IsDir() bool { return false }
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func (f *mem) Mode() os.FileMode { return os.ModeTemporary + 0600 }
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func (f *mem) ModTime() time.Time { return f.modTime }
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func (f *mem) Name() string { return f.name }
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func (f *mem) ReadFrom(r io.Reader) (n int64, err error) { return readFrom(f, r) }
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func (f *mem) Size() (n int64) { return f.size }
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func (f *mem) Stat() (os.FileInfo, error) { return f, nil }
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func (f *mem) Sync() error { return nil }
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func (f *mem) Sys() interface{} { return nil }
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func (f *mem) WriteTo(w io.Writer) (n int64, err error) { return writeTo(f, w) }
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func (f *mem) Close() error {
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f.Truncate(0)
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f.m = nil
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return nil
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}
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func (f *mem) ReadAt(b []byte, off int64) (n int, err error) {
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avail := f.size - off
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pi := off >> f.pgBits
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po := int(off) & f.pgMask
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rem := len(b)
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if int64(rem) >= avail {
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rem = int(avail)
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err = io.EOF
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}
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var zeroPage *[]byte
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for rem != 0 && avail > 0 {
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pg := f.m[pi]
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if pg == nil {
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if zeroPage == nil {
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zeroPage = buffer.CGet(f.pgSize)
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defer buffer.Put(zeroPage)
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}
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pg = zeroPage
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}
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nc := copy(b[:mathutil.Min(rem, f.pgSize)], (*pg)[po:])
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pi++
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po = 0
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rem -= nc
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n += nc
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b = b[nc:]
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}
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return n, err
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}
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func (f *mem) Truncate(size int64) (err error) {
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if size < 0 {
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return fmt.Errorf("invalid truncate size: %d", size)
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}
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first := size >> f.pgBits
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if size&int64(f.pgMask) != 0 {
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first++
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}
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last := f.size >> f.pgBits
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if f.size&int64(f.pgMask) != 0 {
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last++
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}
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for ; first <= last; first++ {
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if p := f.m[first]; p != nil {
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buffer.Put(p)
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}
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delete(f.m, first)
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}
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f.size = size
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return nil
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}
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func (f *mem) WriteAt(b []byte, off int64) (n int, err error) {
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pi := off >> f.pgBits
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po := int(off) & f.pgMask
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n = len(b)
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rem := n
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var nc int
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for rem != 0 {
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pg := f.m[pi]
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if pg == nil {
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pg = buffer.CGet(f.pgSize)
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f.m[pi] = pg
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}
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nc = copy((*pg)[po:], b)
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pi++
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po = 0
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rem -= nc
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b = b[nc:]
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}
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f.size = mathutil.MaxInt64(f.size, off+int64(n))
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return n, nil
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}
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type stat struct {
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os.FileInfo
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size int64
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}
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func (s stat) Size() int64 { return s.size }
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type fileMap map[int64]mmap.MMap
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type file struct {
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f *os.File
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m fileMap
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maxPages int
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pgBits uint
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pgMask int
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pgSize int
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size int64
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fsize int64
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}
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func newFile(f *os.File, maxSize int64, pgBits uint) (*file, error) {
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if maxSize < 0 {
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panic("internal error")
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}
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pgSize := 1 << pgBits
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switch {
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case sysPage > pgSize:
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pgBits = uint(mathutil.Log2Uint64(uint64(sysPage)))
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default:
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pgBits = uint(mathutil.Log2Uint64(uint64(pgSize / sysPage * sysPage)))
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}
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pgSize = 1 << pgBits
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fi := &file{
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f: f,
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m: fileMap{},
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maxPages: int(mathutil.MinInt64(
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1024,
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mathutil.MaxInt64(maxSize/int64(pgSize), 1)),
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),
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pgBits: pgBits,
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pgMask: pgSize - 1,
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pgSize: pgSize,
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}
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info, err := f.Stat()
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if err != nil {
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return nil, err
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}
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if err = fi.Truncate(info.Size()); err != nil {
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return nil, err
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}
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return fi, nil
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}
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func (f *file) ReadFrom(r io.Reader) (n int64, err error) { return readFrom(f, r) }
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func (f *file) Sync() (err error) { return f.f.Sync() }
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func (f *file) WriteTo(w io.Writer) (n int64, err error) { return writeTo(f, w) }
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func (f *file) Close() (err error) {
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for _, p := range f.m {
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if err = p.Unmap(); err != nil {
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return err
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}
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}
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if err = f.f.Truncate(f.size); err != nil {
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return err
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}
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if err = f.f.Sync(); err != nil {
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return err
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}
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if err = f.f.Close(); err != nil {
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return err
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}
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f.m = nil
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f.f = nil
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return nil
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}
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func (f *file) page(index int64) (mmap.MMap, error) {
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if len(f.m) == f.maxPages {
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for i, p := range f.m {
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if err := p.Unmap(); err != nil {
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return nil, err
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}
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delete(f.m, i)
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break
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}
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}
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off := index << f.pgBits
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fsize := off + int64(f.pgSize)
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if fsize > f.fsize {
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if err := f.f.Truncate(fsize); err != nil {
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return nil, err
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}
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f.fsize = fsize
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}
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p, err := mmap.MapRegion(f.f, f.pgSize, mmap.RDWR, 0, off)
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if err != nil {
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return nil, err
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}
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f.m[index] = p
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return p, nil
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}
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func (f *file) ReadAt(b []byte, off int64) (n int, err error) {
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avail := f.size - off
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pi := off >> f.pgBits
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po := int(off) & f.pgMask
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rem := len(b)
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if int64(rem) >= avail {
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rem = int(avail)
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err = io.EOF
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}
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for rem != 0 && avail > 0 {
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pg := f.m[pi]
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if pg == nil {
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if pg, err = f.page(pi); err != nil {
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return n, err
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}
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}
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nc := copy(b[:mathutil.Min(rem, f.pgSize)], pg[po:])
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pi++
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po = 0
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rem -= nc
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n += nc
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b = b[nc:]
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}
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return n, err
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}
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func (f *file) Stat() (os.FileInfo, error) {
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fi, err := f.f.Stat()
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if err != nil {
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return nil, err
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}
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return stat{fi, f.size}, nil
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}
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func (f *file) Truncate(size int64) (err error) {
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if size < 0 {
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return fmt.Errorf("invalid truncate size: %d", size)
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}
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first := size >> f.pgBits
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if size&int64(f.pgMask) != 0 {
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first++
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}
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last := f.size >> f.pgBits
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if f.size&int64(f.pgMask) != 0 {
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last++
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}
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for ; first <= last; first++ {
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if p := f.m[first]; p != nil {
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if err := p.Unmap(); err != nil {
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return err
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}
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}
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delete(f.m, first)
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}
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f.size = size
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fsize := (size + int64(f.pgSize) - 1) &^ int64(f.pgMask)
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if fsize != f.fsize {
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if err := f.f.Truncate(fsize); err != nil {
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return err
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}
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}
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f.fsize = fsize
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return nil
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}
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func (f *file) WriteAt(b []byte, off int64) (n int, err error) {
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pi := off >> f.pgBits
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po := int(off) & f.pgMask
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n = len(b)
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rem := n
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var nc int
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for rem != 0 {
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pg := f.m[pi]
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if pg == nil {
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pg, err = f.page(pi)
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if err != nil {
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return n, err
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}
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}
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nc = copy(pg[po:], b)
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pi++
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po = 0
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rem -= nc
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b = b[nc:]
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}
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f.size = mathutil.MaxInt64(f.size, off+int64(n))
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return n, nil
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}
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// ----------------------------------------------------------------------------
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func readFrom(f Interface, r io.Reader) (n int64, err error) {
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f.Truncate(0)
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p := buffer.Get(copyBufSize)
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b := *p
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defer buffer.Put(p)
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var off int64
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var werr error
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for {
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rn, rerr := r.Read(b)
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if rn != 0 {
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_, werr = f.WriteAt(b[:rn], off)
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n += int64(rn)
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off += int64(rn)
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}
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if rerr != nil {
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if !fileutil.IsEOF(rerr) {
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err = rerr
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}
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break
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}
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if werr != nil {
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err = werr
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break
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}
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}
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return n, err
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}
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func writeTo(f Interface, w io.Writer) (n int64, err error) {
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p := buffer.Get(copyBufSize)
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b := *p
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defer buffer.Put(p)
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var off int64
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var werr error
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for {
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rn, rerr := f.ReadAt(b, off)
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if rn != 0 {
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_, werr = w.Write(b[:rn])
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n += int64(rn)
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off += int64(rn)
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}
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if rerr != nil {
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if !fileutil.IsEOF(rerr) {
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err = rerr
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}
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break
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}
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|
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if werr != nil {
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err = werr
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break
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}
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}
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return n, err
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}
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Reference in New Issue
Block a user