![]() ![]() JPEGs on smartphones, especially, are good candidates for compression. Compression, in this case, could be a useful tool to reduce the size of that photo so you don’t need to delete it. This will cause the photo to take up a lot of space on your hard drive. A high-resolution photograph from an expensive camera, for example, could be huge. However, you can control how much compression the image receives to find a comfortable balance between file size and image quality. There are two types of compression: lossless, which reduces the file size without reducing quality, and lossy, which reduces the size and quality.īecause of the nature of JPEG files, only lossy compression is possible with these kinds of images. UncompressedSize64 uint64 Extra byte ExternalAttrs uint32 // Meaning depends on CreatorVersion}įileHeader describes a file within a ZIP file.When you compress a digital file, you remove bits of information in order to reduce its overall size. UncompressedSize uint32 // CompressedSize64 is the compressed size of the file in bytes.ĜompressedSize64 uint64 // UncompressedSize64 is the uncompressed size of the file in bytes. // Deprecated: Use UncompressedSize64 instead. If either the uncompressed or compressed size of the file // does not fit in 32 bits, CompressedSize is set to ^uint32(0). // Deprecated: Use CompressedSize64 instead.ĬompressedSize uint32 // UncompressedSize is the compressed size of the file in bytes. ModifiedDate uint16 // CRC32 is the CRC32 checksum of the file content.ĜRC32 uint32 // CompressedSize is the compressed size of the file in bytes. ModifiedTime uint16 // ModifiedDate is an MS-DOS-encoded date. Time // ModifiedTime is an MS-DOS-encoded time. The legacy MS-DOS date field is encoded according to the // location of the Modified time. // When writing, an extended timestamp (which is timezone-agnostic) is // always emitted. If only the MS-DOS date is present, the timezone is assumed to be UTC. // 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. Method uint16 // Modified is the modified time of the file. NonUTF8 bool CreatorVersion uint16 ReaderVersion uint16 Flags uint16 // Method is the compression method. Otherwise, the Writer // automatically sets the ZIP format's UTF-8 flag for valid UTF-8 strings. // This flag should only be set if the user intends to encode a non-portable // ZIP file for a specific localized region. // 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. Name string // Comment is any arbitrary user-defined string shorter than 64KiB.Ĝomment string // NonUTF8 indicates that Name and Comment are not encoded in UTF-8. A trailing slash // indicates that this file is a directory and should have no data. // It must be a relative path, not start with a drive letter (such as "C:"), // and must use forward slashes instead of back slashes. func (w *Writer) SetComment(comment string) error.func (w *Writer) RegisterCompressor(method uint16, comp Compressor).func (w *Writer) CreateRaw(fh *FileHeader) (io.Writer, error).func (w *Writer) CreateHeader(fh *FileHeader) (io.Writer, error).func (w *Writer) Create(name string) (io.Writer, error).func (z *Reader) RegisterDecompressor(method uint16, dcomp Decompressor).func (r *Reader) Open(name string) (fs.File, error).func NewReader(r io.ReaderAt, size int64) (*Reader, error).func OpenReader(name string) (*ReadCloser, error).func (h *FileHeader) SetMode(mode fs.FileMode).func (h *FileHeader) SetModTime(t time.Time) deprecated.func (h *FileHeader) Mode() (mode fs.FileMode).func (h *FileHeader) ModTime() time.Time deprecated.func (h *FileHeader) FileInfo() fs.FileInfo.func FileInfoHeader(fi fs.FileInfo) (*FileHeader, error).func (f *File) OpenRaw() (io.Reader, error).func (f *File) Open() (io.ReadCloser, error).func (f *File) DataOffset() (offset int64, err error).func RegisterDecompressor(method uint16, dcomp Decompressor).func RegisterCompressor(method uint16, comp Compressor).The ZIP64 format the 32 bit fields will be 0xffffffff and the 64 bit The 64 bit fields will always contain the correct value andįor normal archives both fields will be the same. To be backwards compatible the FileHeader has both 32 and 64 bit Sizeįields. This package does not support disk spanning. ![]() Package zip provides support for reading and writing ZIP archives. ![]()
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