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Source file src/time/zoneinfo_android.go

Documentation: time

  // Copyright 2016 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // Parse the "tzdata" packed timezone file used on Android.
  // The format is lifted from ZoneInfoDB.java and ZoneInfo.java in
  // java/libcore/util in the AOSP.
  
  package time
  
  import (
  	"errors"
  	"runtime"
  )
  
  var zoneSources = []string{
  	"/system/usr/share/zoneinfo/tzdata",
  	"/data/misc/zoneinfo/current/tzdata",
  	runtime.GOROOT() + "/lib/time/zoneinfo.zip",
  }
  
  func initLocal() {
  	// TODO(elias.naur): getprop persist.sys.timezone
  	localLoc = *UTC
  }
  
  func init() {
  	loadTzinfoFromTzdata = androidLoadTzinfoFromTzdata
  }
  
  func androidLoadTzinfoFromTzdata(file, name string) ([]byte, error) {
  	const (
  		headersize = 12 + 3*4
  		namesize   = 40
  		entrysize  = namesize + 3*4
  	)
  	if len(name) > namesize {
  		return nil, errors.New(name + " is longer than the maximum zone name length (40 bytes)")
  	}
  	fd, err := open(file)
  	if err != nil {
  		return nil, err
  	}
  	defer closefd(fd)
  
  	buf := make([]byte, headersize)
  	if err := preadn(fd, buf, 0); err != nil {
  		return nil, errors.New("corrupt tzdata file " + file)
  	}
  	d := dataIO{buf, false}
  	if magic := d.read(6); string(magic) != "tzdata" {
  		return nil, errors.New("corrupt tzdata file " + file)
  	}
  	d = dataIO{buf[12:], false}
  	indexOff, _ := d.big4()
  	dataOff, _ := d.big4()
  	indexSize := dataOff - indexOff
  	entrycount := indexSize / entrysize
  	buf = make([]byte, indexSize)
  	if err := preadn(fd, buf, int(indexOff)); err != nil {
  		return nil, errors.New("corrupt tzdata file " + file)
  	}
  	for i := 0; i < int(entrycount); i++ {
  		entry := buf[i*entrysize : (i+1)*entrysize]
  		// len(name) <= namesize is checked at function entry
  		if string(entry[:len(name)]) != name {
  			continue
  		}
  		d := dataIO{entry[namesize:], false}
  		off, _ := d.big4()
  		size, _ := d.big4()
  		buf := make([]byte, size)
  		if err := preadn(fd, buf, int(off+dataOff)); err != nil {
  			return nil, errors.New("corrupt tzdata file " + file)
  		}
  		return buf, nil
  	}
  	return nil, errors.New("cannot find " + name + " in tzdata file " + file)
  }
  

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