diff options
Diffstat (limited to 'gcc-4.8.1/libgo/go/time/zoneinfo_read.go')
| -rw-r--r-- | gcc-4.8.1/libgo/go/time/zoneinfo_read.go | 341 |
1 files changed, 0 insertions, 341 deletions
diff --git a/gcc-4.8.1/libgo/go/time/zoneinfo_read.go b/gcc-4.8.1/libgo/go/time/zoneinfo_read.go deleted file mode 100644 index a5a2de218..000000000 --- a/gcc-4.8.1/libgo/go/time/zoneinfo_read.go +++ /dev/null @@ -1,341 +0,0 @@ -// Copyright 2009 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 "zoneinfo" time zone file. -// This is a fairly standard file format used on OS X, Linux, BSD, Sun, and others. -// See tzfile(5), http://en.wikipedia.org/wiki/Zoneinfo, -// and ftp://munnari.oz.au/pub/oldtz/ - -package time - -import "errors" - -const ( - headerSize = 4 + 16 + 4*7 -) - -// Simple I/O interface to binary blob of data. -type data struct { - p []byte - error bool -} - -func (d *data) read(n int) []byte { - if len(d.p) < n { - d.p = nil - d.error = true - return nil - } - p := d.p[0:n] - d.p = d.p[n:] - return p -} - -func (d *data) big4() (n uint32, ok bool) { - p := d.read(4) - if len(p) < 4 { - d.error = true - return 0, false - } - return uint32(p[0])<<24 | uint32(p[1])<<16 | uint32(p[2])<<8 | uint32(p[3]), true -} - -func (d *data) byte() (n byte, ok bool) { - p := d.read(1) - if len(p) < 1 { - d.error = true - return 0, false - } - return p[0], true -} - -// Make a string by stopping at the first NUL -func byteString(p []byte) string { - for i := 0; i < len(p); i++ { - if p[i] == 0 { - return string(p[0:i]) - } - } - return string(p) -} - -var badData = errors.New("malformed time zone information") - -func loadZoneData(bytes []byte) (l *Location, err error) { - d := data{bytes, false} - - // 4-byte magic "TZif" - if magic := d.read(4); string(magic) != "TZif" { - return nil, badData - } - - // 1-byte version, then 15 bytes of padding - var p []byte - if p = d.read(16); len(p) != 16 || p[0] != 0 && p[0] != '2' { - return nil, badData - } - - // six big-endian 32-bit integers: - // number of UTC/local indicators - // number of standard/wall indicators - // number of leap seconds - // number of transition times - // number of local time zones - // number of characters of time zone abbrev strings - const ( - NUTCLocal = iota - NStdWall - NLeap - NTime - NZone - NChar - ) - var n [6]int - for i := 0; i < 6; i++ { - nn, ok := d.big4() - if !ok { - return nil, badData - } - n[i] = int(nn) - } - - // Transition times. - txtimes := data{d.read(n[NTime] * 4), false} - - // Time zone indices for transition times. - txzones := d.read(n[NTime]) - - // Zone info structures - zonedata := data{d.read(n[NZone] * 6), false} - - // Time zone abbreviations. - abbrev := d.read(n[NChar]) - - // Leap-second time pairs - d.read(n[NLeap] * 8) - - // Whether tx times associated with local time types - // are specified as standard time or wall time. - isstd := d.read(n[NStdWall]) - - // Whether tx times associated with local time types - // are specified as UTC or local time. - isutc := d.read(n[NUTCLocal]) - - if d.error { // ran out of data - return nil, badData - } - - // If version == 2, the entire file repeats, this time using - // 8-byte ints for txtimes and leap seconds. - // We won't need those until 2106. - - // Now we can build up a useful data structure. - // First the zone information. - // utcoff[4] isdst[1] nameindex[1] - zone := make([]zone, n[NZone]) - for i := range zone { - var ok bool - var n uint32 - if n, ok = zonedata.big4(); !ok { - return nil, badData - } - zone[i].offset = int(int32(n)) - var b byte - if b, ok = zonedata.byte(); !ok { - return nil, badData - } - zone[i].isDST = b != 0 - if b, ok = zonedata.byte(); !ok || int(b) >= len(abbrev) { - return nil, badData - } - zone[i].name = byteString(abbrev[b:]) - } - - // Now the transition time info. - tx := make([]zoneTrans, n[NTime]) - for i := range tx { - var ok bool - var n uint32 - if n, ok = txtimes.big4(); !ok { - return nil, badData - } - tx[i].when = int64(int32(n)) - if int(txzones[i]) >= len(zone) { - return nil, badData - } - tx[i].index = txzones[i] - if i < len(isstd) { - tx[i].isstd = isstd[i] != 0 - } - if i < len(isutc) { - tx[i].isutc = isutc[i] != 0 - } - } - - // Committed to succeed. - l = &Location{zone: zone, tx: tx} - - // Fill in the cache with information about right now, - // since that will be the most common lookup. - sec, _ := now() - for i := range tx { - if tx[i].when <= sec && (i+1 == len(tx) || sec < tx[i+1].when) { - l.cacheStart = tx[i].when - l.cacheEnd = 1<<63 - 1 - if i+1 < len(tx) { - l.cacheEnd = tx[i+1].when - } - l.cacheZone = &l.zone[tx[i].index] - } - } - - return l, nil -} - -func loadZoneFile(dir, name string) (l *Location, err error) { - if len(dir) > 4 && dir[len(dir)-4:] == ".zip" { - return loadZoneZip(dir, name) - } - if dir != "" { - name = dir + "/" + name - } - buf, err := readFile(name) - if err != nil { - return - } - return loadZoneData(buf) -} - -// There are 500+ zoneinfo files. Rather than distribute them all -// individually, we ship them in an uncompressed zip file. -// Used this way, the zip file format serves as a commonly readable -// container for the individual small files. We choose zip over tar -// because zip files have a contiguous table of contents, making -// individual file lookups faster, and because the per-file overhead -// in a zip file is considerably less than tar's 512 bytes. - -// get4 returns the little-endian 32-bit value in b. -func get4(b []byte) int { - if len(b) < 4 { - return 0 - } - return int(b[0]) | int(b[1])<<8 | int(b[2])<<16 | int(b[3])<<24 -} - -// get2 returns the little-endian 16-bit value in b. -func get2(b []byte) int { - if len(b) < 2 { - return 0 - } - return int(b[0]) | int(b[1])<<8 -} - -func loadZoneZip(zipfile, name string) (l *Location, err error) { - fd, err := open(zipfile) - if err != nil { - return nil, errors.New("open " + zipfile + ": " + err.Error()) - } - defer closefd(fd) - - const ( - zecheader = 0x06054b50 - zcheader = 0x02014b50 - ztailsize = 22 - - zheadersize = 30 - zheader = 0x04034b50 - ) - - buf := make([]byte, ztailsize) - if err := preadn(fd, buf, -ztailsize); err != nil || get4(buf) != zecheader { - return nil, errors.New("corrupt zip file " + zipfile) - } - n := get2(buf[10:]) - size := get4(buf[12:]) - off := get4(buf[16:]) - - buf = make([]byte, size) - if err := preadn(fd, buf, off); err != nil { - return nil, errors.New("corrupt zip file " + zipfile) - } - - for i := 0; i < n; i++ { - // zip entry layout: - // 0 magic[4] - // 4 madevers[1] - // 5 madeos[1] - // 6 extvers[1] - // 7 extos[1] - // 8 flags[2] - // 10 meth[2] - // 12 modtime[2] - // 14 moddate[2] - // 16 crc[4] - // 20 csize[4] - // 24 uncsize[4] - // 28 namelen[2] - // 30 xlen[2] - // 32 fclen[2] - // 34 disknum[2] - // 36 iattr[2] - // 38 eattr[4] - // 42 off[4] - // 46 name[namelen] - // 46+namelen+xlen+fclen - next header - // - if get4(buf) != zcheader { - break - } - meth := get2(buf[10:]) - size := get4(buf[24:]) - namelen := get2(buf[28:]) - xlen := get2(buf[30:]) - fclen := get2(buf[32:]) - off := get4(buf[42:]) - zname := buf[46 : 46+namelen] - buf = buf[46+namelen+xlen+fclen:] - if string(zname) != name { - continue - } - if meth != 0 { - return nil, errors.New("unsupported compression for " + name + " in " + zipfile) - } - - // zip per-file header layout: - // 0 magic[4] - // 4 extvers[1] - // 5 extos[1] - // 6 flags[2] - // 8 meth[2] - // 10 modtime[2] - // 12 moddate[2] - // 14 crc[4] - // 18 csize[4] - // 22 uncsize[4] - // 26 namelen[2] - // 28 xlen[2] - // 30 name[namelen] - // 30+namelen+xlen - file data - // - buf = make([]byte, zheadersize+namelen) - if err := preadn(fd, buf, off); err != nil || - get4(buf) != zheader || - get2(buf[8:]) != meth || - get2(buf[26:]) != namelen || - string(buf[30:30+namelen]) != name { - return nil, errors.New("corrupt zip file " + zipfile) - } - xlen = get2(buf[28:]) - - buf = make([]byte, size) - if err := preadn(fd, buf, off+30+namelen+xlen); err != nil { - return nil, errors.New("corrupt zip file " + zipfile) - } - - return loadZoneData(buf) - } - - return nil, errors.New("cannot find " + name + " in zip file " + zipfile) -} |