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package main
import (
"log"
"os"
"time"
flag "github.com/spf13/pflag"
)
// Compression methods.
const (
Store uint16 = 0 // no compression
Deflate uint16 = 8 // DEFLATE compressed
)
const (
fileHeaderSignature = 0x04034b50
fileHeaderLen = 30 // + filename + extra
)
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
}
func main() {
var filename string
flag.StringVarP(&filename, "filename", "f", "", "filename")
flag.Parse()
f, err := os.Open(filename)
if err != nil {
log.Fatal(err)
}
defer f.Close()
}
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