Package: archive/zip

type Compressor (func) A Compressor returns a new compressing writer, writing to w. The WriteCloser's Close method must be used to flush pending data to w. The Compressor itself must be safe to invoke from multiple goroutines simultaneously, but each returned writer will be used only by one goroutine at a time. As Inputs Of (2+) func RegisterCompressor(method uint16, comp Compressor) func (*Writer).RegisterCompressor(method uint16, comp Compressor)

type Decompressor (func) A Decompressor returns a new decompressing reader, reading from r. The ReadCloser's Close method must be used to release associated resources. The Decompressor itself must be safe to invoke from multiple goroutines simultaneously, but each returned reader will be used only by one goroutine at a time. As Inputs Of (2+) func RegisterDecompressor(method uint16, dcomp Decompressor) func (*Reader).RegisterDecompressor(method uint16, dcomp Decompressor)

type File (struct) Exported Fields (18) FileHeader FileHeader FileHeader.CRC32 uint32 FileHeader.Comment string Comment is any arbitrary user-defined string shorter than 64KiB. FileHeader.CompressedSize uint32 // Deprecated: Use CompressedSize64 instead. FileHeader.CompressedSize64 uint64 FileHeader.CreatorVersion uint16 FileHeader.ExternalAttrs uint32 // Meaning depends on CreatorVersion FileHeader.Extra []byte FileHeader.Flags uint16 FileHeader.Method uint16 Method is the compression method. If zero, Store is used. FileHeader.Modified time.Time 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. FileHeader.ModifiedDate uint16 // Deprecated: Legacy MS-DOS time; use Modified instead. FileHeader.ModifiedTime uint16 // Deprecated: Legacy MS-DOS date; use Modified instead. FileHeader.Name string 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 ("../../../"). FileHeader.NonUTF8 bool 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. FileHeader.ReaderVersion uint16 FileHeader.UncompressedSize uint32 // Deprecated: Use UncompressedSize64 instead. FileHeader.UncompressedSize64 uint64 Exported Methods (7) (*T) DataOffset() (offset int64, err error) DataOffset returns the offset of the file's possibly-compressed data, relative to the beginning of the zip file. Most callers should instead use Open, which transparently decompresses data and verifies checksums. (*T) FileInfo() os.FileInfo FileInfo returns an os.FileInfo for the FileHeader. (*T) ModTime() time.Time ModTime returns the modification time in UTC using the legacy ModifiedDate and ModifiedTime fields. Deprecated: Use Modified instead. (*T) Mode() (mode os.FileMode) Mode returns the permission and mode bits for the FileHeader. (*T) Open() (io.ReadCloser, error) Open returns a ReadCloser that provides access to the File's contents. Multiple files may be read concurrently. (*T) SetModTime(t time.Time) SetModTime sets the Modified, ModifiedTime, and ModifiedDate fields to the given time in UTC. Deprecated: Use Modified instead. (*T) SetMode(mode os.FileMode) SetMode changes the permission and mode bits for the FileHeader.

type FileHeader (struct) FileHeader describes a file within a zip file. See the zip spec for details. Exported Fields (17) CRC32 uint32 Comment string Comment is any arbitrary user-defined string shorter than 64KiB. CompressedSize uint32 // Deprecated: Use CompressedSize64 instead. CompressedSize64 uint64 CreatorVersion uint16 ExternalAttrs uint32 // Meaning depends on CreatorVersion Extra []byte Flags uint16 Method uint16 Method is the compression method. If zero, Store is used. Modified time.Time 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. ModifiedDate uint16 // Deprecated: Legacy MS-DOS time; use Modified instead. ModifiedTime uint16 // Deprecated: Legacy MS-DOS date; use Modified instead. Name string 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 ("../../../"). NonUTF8 bool 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. ReaderVersion uint16 UncompressedSize uint32 // Deprecated: Use UncompressedSize64 instead. UncompressedSize64 uint64 Exported Methods (5) (*T) FileInfo() os.FileInfo FileInfo returns an os.FileInfo for the FileHeader. (*T) ModTime() time.Time ModTime returns the modification time in UTC using the legacy ModifiedDate and ModifiedTime fields. Deprecated: Use Modified instead. (*T) Mode() (mode os.FileMode) Mode returns the permission and mode bits for the FileHeader. (*T) SetModTime(t time.Time) SetModTime sets the Modified, ModifiedTime, and ModifiedDate fields to the given time in UTC. Deprecated: Use Modified instead. (*T) SetMode(mode os.FileMode) SetMode changes the permission and mode bits for the FileHeader. As Outputs Of (1+) func FileInfoHeader(fi os.FileInfo) (*FileHeader, error) As Inputs Of (1+) func (*Writer).CreateHeader(fh *FileHeader) (io.Writer, error)

type ReadCloser (struct) Exported Fields (3) Reader Reader Reader.Comment string Reader.File []*File Exported Methods (2) (*T) Close() error Close closes the Zip file, rendering it unusable for I/O. (*T) RegisterDecompressor(method uint16, dcomp Decompressor) RegisterDecompressor registers or overrides a custom decompressor for a specific method ID. If a decompressor for a given method is not found, Reader will default to looking up the decompressor at the package level. Implements (1+) *T : io.Closer As Outputs Of (1+) func OpenReader(name string) (*ReadCloser, error)

type Reader (struct) Exported Fields (2) Comment string File []*File One Exported Method (*T) RegisterDecompressor(method uint16, dcomp Decompressor) RegisterDecompressor registers or overrides a custom decompressor for a specific method ID. If a decompressor for a given method is not found, Reader will default to looking up the decompressor at the package level. As Outputs Of (1+) func NewReader(r io.ReaderAt, size int64) (*Reader, error)

type Writer (struct) Writer implements a zip file writer. Exported Methods (7) (*T) Close() error Close finishes writing the zip file by writing the central directory. It does not close the underlying writer. (*T) Create(name string) (io.Writer, error) Create adds a file to the zip file using the provided name. It returns a Writer to which the file contents should be written. The file contents will be compressed using the Deflate method. The name must be a relative path: it must not start with a drive letter (e.g. C:) or leading slash, and only forward slashes are allowed. To create a directory instead of a file, add a trailing slash to the name. The file's contents must be written to the io.Writer before the next call to Create, CreateHeader, or Close. (*T) CreateHeader(fh *FileHeader) (io.Writer, error) CreateHeader adds a file to the zip archive using the provided FileHeader for the file metadata. Writer takes ownership of fh and may mutate its fields. The caller must not modify fh after calling CreateHeader. This returns a Writer to which the file contents should be written. The file's contents must be written to the io.Writer before the next call to Create, CreateHeader, or Close. (*T) Flush() error Flush flushes any buffered data to the underlying writer. Calling Flush is not normally necessary; calling Close is sufficient. (*T) RegisterCompressor(method uint16, comp Compressor) RegisterCompressor registers or overrides a custom compressor for a specific method ID. If a compressor for a given method is not found, Writer will default to looking up the compressor at the package level. (*T) SetComment(comment string) error SetComment sets the end-of-central-directory comment field. It can only be called before Close. (*T) SetOffset(n int64) SetOffset sets the offset of the beginning of the zip data within the underlying writer. It should be used when the zip data is appended to an existing file, such as a binary executable. It must be called before any data is written. Implements (1+) *T : io.Closer As Outputs Of (1+) func NewWriter(w io.Writer) *Writer

const Deflate uint16 = 8 // DEFLATE compressed Compression methods.

var ErrAlgorithm error

var ErrChecksum error

func FileInfoHeader(fi os.FileInfo) (*FileHeader, error) 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 NewReader(r io.ReaderAt, size int64) (*Reader, error) NewReader returns a new Reader reading from r, which is assumed to have the given size in bytes.

func NewWriter(w io.Writer) *Writer NewWriter returns a new Writer writing a zip file to w.

func OpenReader(name string) (*ReadCloser, error) OpenReader will open the Zip file specified by name and return a ReadCloser.

func RegisterCompressor(method uint16, comp Compressor) RegisterCompressor registers custom compressors for a specified method ID. The common methods Store and Deflate are built in.

func RegisterDecompressor(method uint16, dcomp Decompressor) RegisterDecompressor allows custom decompressors for a specified method ID. The common methods Store and Deflate are built in.