// Copyright 2010 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.
/*
Package zip provides support for reading and writing ZIP archives.
See: https://www.pkware.com/appnote
This package does not support disk spanning.
A note about ZIP64:
To be backwards compatible the FileHeader has both 32 and 64 bit Size
fields. The 64 bit fields will always contain the correct value and
for normal archives both fields will be the same. For files requiring
the ZIP64 format the 32 bit fields will be 0xffffffff and the 64 bit
fields must be used instead.
*/
package zip
import (
"os"
"path"
"time"
)
// Compression methods.
const (
Store uint16 = 0 // no compression
Deflate uint16 = 8 // DEFLATE compressed
)
const (
fileHeaderSignature = 0x04034b50
directoryHeaderSignature = 0x02014b50
directoryEndSignature = 0x06054b50
directory64LocSignature = 0x07064b50
directory64EndSignature = 0x06064b50
dataDescriptorSignature = 0x08074b50 // de-facto standard; required by OS X Finder
fileHeaderLen = 30 // + filename + extra
directoryHeaderLen = 46 // + filename + extra + comment
directoryEndLen = 22 // + comment
dataDescriptorLen = 16 // four uint32: descriptor signature, crc32, compressed size, size
dataDescriptor64Len = 24 // descriptor with 8 byte sizes
directory64LocLen = 20 //
directory64EndLen = 56 // + extra
// Constants for the first byte in CreatorVersion.
creatorFAT = 0
creatorUnix = 3
creatorNTFS = 11
creatorVFAT = 14
creatorMacOSX = 19
// Version numbers.
zipVersion20 = 20 // 2.0
zipVersion45 = 45 // 4.5 (reads and writes zip64 archives)
// Limits for non zip64 files.
uint16max = (1 << 16) - 1
uint32max = (1 << 32) - 1
// Extra header IDs.
//
// IDs 0..31 are reserved for official use by PKWARE.
// IDs above that range are defined by third-party vendors.
// Since ZIP lacked high precision timestamps (nor a official specification
// of the timezone used for the date fields), many competing extra fields
// have been invented. Pervasive use effectively makes them "official".
//
// See http://mdfs.net/Docs/Comp/Archiving/Zip/ExtraField
zip64ExtraID = 0x0001 // Zip64 extended information
ntfsExtraID = 0x000a // NTFS
unixExtraID = 0x000d // UNIX
extTimeExtraID = 0x5455 // Extended timestamp
infoZipUnixExtraID = 0x5855 // Info-ZIP Unix extension
)
// FileHeader describes a file within a zip file.
// See the zip spec for details.
type FileHeader struct {
// Name is the name of the file.
//
// It must be a relative path, not start with a drive letter (such as "C:"),
// and must use forward slashes instead of back slashes. A trailing slash
// indicates that this file is a directory and should have no data.
//
// When reading zip files, the Name field is populated from
// the zip file directly and is not validated for correctness.
// It is the caller's responsibility to sanitize it as
// appropriate, including canonicalizing slash directions,
// validating that paths are relative, and preventing path
// traversal through filenames ("../../../").
Name string
// Comment is any arbitrary user-defined string shorter than 64KiB.
Comment string
// NonUTF8 indicates that Name and Comment are not encoded in UTF-8.
//
// By specification, the only other encoding permitted should be CP-437,
// but historically many ZIP readers interpret Name and Comment as whatever
// the system's local character encoding happens to be.
//
// This flag should only be set if the user intends to encode a non-portable
// ZIP file for a specific localized region. Otherwise, the Writer
// automatically sets the ZIP format's UTF-8 flag for valid UTF-8 strings.
NonUTF8 bool
CreatorVersion uint16
ReaderVersion uint16
Flags uint16
// Method is the compression method. If zero, Store is used.
Method uint16
// Modified is the modified time of the file.
//
// When reading, an extended timestamp is preferred over the legacy MS-DOS
// date field, and the offset between the times is used as the timezone.
// If only the MS-DOS date is present, the timezone is assumed to be UTC.
//
// When writing, an extended timestamp (which is timezone-agnostic) is
// always emitted. The legacy MS-DOS date field is encoded according to the
// location of the Modified time.
Modified time.Time
ModifiedTime uint16 // Deprecated: Legacy MS-DOS date; use Modified instead.
ModifiedDate uint16 // Deprecated: Legacy MS-DOS time; use Modified instead.
CRC32 uint32
CompressedSize uint32 // Deprecated: Use CompressedSize64 instead.
UncompressedSize uint32 // Deprecated: Use UncompressedSize64 instead.
CompressedSize64 uint64
UncompressedSize64 uint64
Extra []byte
ExternalAttrs uint32 // Meaning depends on CreatorVersion
}
// FileInfo returns an os.FileInfo for the FileHeader.
func (h *FileHeader) FileInfo() os.FileInfo {
return headerFileInfo{h}
}
// headerFileInfo implements os.FileInfo.
type headerFileInfo struct {
fh *FileHeader
}
func (fi headerFileInfo) Name() string { return path.Base(fi.fh.Name) }
func (fi headerFileInfo) Size() int64 {
if fi.fh.UncompressedSize64 > 0 {
return int64(fi.fh.UncompressedSize64)
}
return int64(fi.fh.UncompressedSize)
}
func (fi headerFileInfo) IsDir() bool { return fi.Mode().IsDir() }
func (fi headerFileInfo) ModTime() time.Time {
if fi.fh.Modified.IsZero() {
return fi.fh.ModTime()
}
return fi.fh.Modified.UTC()
}
func (fi headerFileInfo) Mode() os.FileMode { return fi.fh.Mode() }
func (fi headerFileInfo) Sys() interface{} { return fi.fh }
// FileInfoHeader creates a partially-populated FileHeader from an
// os.FileInfo.
// Because os.FileInfo's Name method returns only the base name of
// the file it describes, it may be necessary to modify the Name field
// of the returned header to provide the full path name of the file.
// If compression is desired, callers should set the FileHeader.Method
// field; it is unset by default.
func FileInfoHeader(fi os.FileInfo) (*FileHeader, error) {
size := fi.Size()
fh := &FileHeader{
Name: fi.Name(),
UncompressedSize64: uint64(size),
}
fh.SetModTime(fi.ModTime())
fh.SetMode(fi.Mode())
if fh.UncompressedSize64 > uint32max {
fh.UncompressedSize = uint32max
} else {
fh.UncompressedSize = uint32(fh.UncompressedSize64)
}
return fh, nil
}
type directoryEnd struct {
diskNbr uint32 // unused
dirDiskNbr uint32 // unused
dirRecordsThisDisk uint64 // unused
directoryRecords uint64
directorySize uint64
directoryOffset uint64 // relative to file
commentLen uint16
comment string
}
// timeZone returns a *time.Location based on the provided offset.
// If the offset is non-sensible, then this uses an offset of zero.
func timeZone(offset time.Duration) *time.Location {
const (
minOffset = -12 * time.Hour // E.g., Baker island at -12:00
maxOffset = +14 * time.Hour // E.g., Line island at +14:00
offsetAlias = 15 * time.Minute // E.g., Nepal at +5:45
)
offset = offset.Round(offsetAlias)
if offset < minOffset || maxOffset < offset {
offset = 0
}
return time.FixedZone("", int(offset/time.Second))
}
// msDosTimeToTime converts an MS-DOS date and time into a time.Time.
// The resolution is 2s.
// See: https://msdn.microsoft.com/en-us/library/ms724247(v=VS.85).aspx
func msDosTimeToTime(dosDate, dosTime uint16) time.Time {
return time.Date(
// date bits 0-4: day of month; 5-8: month; 9-15: years since 1980
int(dosDate>>9+1980),
time.Month(dosDate>>5&0xf),
int(dosDate&0x1f),
// time bits 0-4: second/2; 5-10: minute; 11-15: hour
int(dosTime>>11),
int(dosTime>>5&0x3f),
int(dosTime&0x1f*2),
0, // nanoseconds
time.UTC,
)
}
// timeToMsDosTime converts a time.Time to an MS-DOS date and time.
// The resolution is 2s.
// See: https://msdn.microsoft.com/en-us/library/ms724274(v=VS.85).aspx
func timeToMsDosTime(t time.Time) (fDate uint16, fTime uint16) {
fDate = uint16(t.Day() + int(t.Month())<<5 + (t.Year()-1980)<<9)
fTime = uint16(t.Second()/2 + t.Minute()<<5 + t.Hour()<<11)
return
}
// ModTime returns the modification time in UTC using the legacy
// ModifiedDate and ModifiedTime fields.
//
// Deprecated: Use Modified instead.
func (h *FileHeader) ModTime() time.Time {
return msDosTimeToTime(h.ModifiedDate, h.ModifiedTime)
}
// SetModTime sets the Modified, ModifiedTime, and ModifiedDate fields
// to the given time in UTC.
//
// Deprecated: Use Modified instead.
func (h *FileHeader) SetModTime(t time.Time) {
t = t.UTC() // Convert to UTC for compatibility
h.Modified = t
h.ModifiedDate, h.ModifiedTime = timeToMsDosTime(t)
}
const (
// Unix constants. The specification doesn't mention them,
// but these seem to be the values agreed on by tools.
s_IFMT = 0xf000
s_IFSOCK = 0xc000
s_IFLNK = 0xa000
s_IFREG = 0x8000
s_IFBLK = 0x6000
s_IFDIR = 0x4000
s_IFCHR = 0x2000
s_IFIFO = 0x1000
s_ISUID = 0x800
s_ISGID = 0x400
s_ISVTX = 0x200
msdosDir = 0x10
msdosReadOnly = 0x01
)
// Mode returns the permission and mode bits for the FileHeader.
func (h *FileHeader) Mode() (mode os.FileMode) {
switch h.CreatorVersion >> 8 {
case creatorUnix, creatorMacOSX:
mode = unixModeToFileMode(h.ExternalAttrs >> 16)
case creatorNTFS, creatorVFAT, creatorFAT:
mode = msdosModeToFileMode(h.ExternalAttrs)
}
if len(h.Name) > 0 && h.Name[len(h.Name)-1] == '/' {
mode |= os.ModeDir
}
return mode
}
// SetMode changes the permission and mode bits for the FileHeader.
func (h *FileHeader) SetMode(mode os.FileMode) {
h.CreatorVersion = h.CreatorVersion&0xff | creatorUnix<<8
h.ExternalAttrs = fileModeToUnixMode(mode) << 16
// set MSDOS attributes too, as the original zip does.
if mode&os.ModeDir != 0 {
h.ExternalAttrs |= msdosDir
}
if mode&0200 == 0 {
h.ExternalAttrs |= msdosReadOnly
}
}
// isZip64 reports whether the file size exceeds the 32 bit limit
func (h *FileHeader) isZip64() bool {
return h.CompressedSize64 >= uint32max || h.UncompressedSize64 >= uint32max
}
func msdosModeToFileMode(m uint32) (mode os.FileMode) {
if m&msdosDir != 0 {
mode = os.ModeDir | 0777
} else {
mode = 0666
}
if m&msdosReadOnly != 0 {
mode &^= 0222
}
return mode
}
func fileModeToUnixMode(mode os.FileMode) uint32 {
var m uint32
switch mode & os.ModeType {
default:
m = s_IFREG
case os.ModeDir:
m = s_IFDIR
case os.ModeSymlink:
m = s_IFLNK
case os.ModeNamedPipe:
m = s_IFIFO
case os.ModeSocket:
m = s_IFSOCK
case os.ModeDevice:
if mode&os.ModeCharDevice != 0 {
m = s_IFCHR
} else {
m = s_IFBLK
}
}
if mode&os.ModeSetuid != 0 {
m |= s_ISUID
}
if mode&os.ModeSetgid != 0 {
m |= s_ISGID
}
if mode&os.ModeSticky != 0 {
m |= s_ISVTX
}
return m | uint32(mode&0777)
}
func unixModeToFileMode(m uint32) os.FileMode {
mode := os.FileMode(m & 0777)
switch m & s_IFMT {
case s_IFBLK:
mode |= os.ModeDevice
case s_IFCHR:
mode |= os.ModeDevice | os.ModeCharDevice
case s_IFDIR:
mode |= os.ModeDir
case s_IFIFO:
mode |= os.ModeNamedPipe
case s_IFLNK:
mode |= os.ModeSymlink
case s_IFREG:
// nothing to do
case s_IFSOCK:
mode |= os.ModeSocket
}
if m&s_ISGID != 0 {
mode |= os.ModeSetgid
}
if m&s_ISUID != 0 {
mode |= os.ModeSetuid
}
if m&s_ISVTX != 0 {
mode |= os.ModeSticky
}
return mode
}
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