2017-05-15 21:57:46 +00:00
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package odb
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2017-06-15 18:25:20 +00:00
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import (
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"bytes"
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"io"
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)
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2017-05-15 21:57:46 +00:00
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// Blob represents a Git object of type "blob".
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type Blob struct {
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// Size is the total uncompressed size of the blob's contents.
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Size int64
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// Contents is a reader that yields the uncompressed blob contents. It
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// may only be read once. It may or may not implement io.ReadSeeker.
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Contents io.Reader
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// closeFn is a function that is called to free any resources held by
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// the Blob. In particular, this will close a file, if the Blob is
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// being read from a file on disk.
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closeFn func() error
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}
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2017-06-15 18:25:20 +00:00
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// NewBlobFromBytes returns a new *Blob that yields the data given.
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func NewBlobFromBytes(contents []byte) *Blob {
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return &Blob{
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Contents: bytes.NewReader(contents),
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Size: int64(len(contents)),
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}
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}
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2017-05-15 21:57:46 +00:00
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// Type implements Object.ObjectType by returning the correct object type for
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// Blobs, BlobObjectType.
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func (b *Blob) Type() ObjectType { return BlobObjectType }
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// Decode implements Object.Decode and decodes the uncompressed blob contents
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// being read. It returns the number of bytes that it consumed off of the
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// stream, which is always zero.
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//
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2017-05-16 22:05:31 +00:00
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// If any errors are encountered while reading the blob, they will be returned.
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2017-05-15 21:57:46 +00:00
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func (b *Blob) Decode(r io.Reader, size int64) (n int, err error) {
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b.Size = size
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b.Contents = io.LimitReader(r, size)
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b.closeFn = func() error {
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if closer, ok := r.(io.Closer); ok {
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return closer.Close()
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}
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return nil
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}
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return 0, nil
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}
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// Encode encodes the blob's contents to the given io.Writer, "w". If there was
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// any error copying the blob's contents, that error will be returned.
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//
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// Otherwise, the number of bytes written will be returned.
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func (b *Blob) Encode(to io.Writer) (n int, err error) {
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nn, err := io.Copy(to, b.Contents)
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2017-05-16 22:04:39 +00:00
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2017-05-15 21:57:46 +00:00
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return int(nn), err
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}
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// Closes closes any resources held by the open Blob, or returns nil if there
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// were no errors.
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func (b *Blob) Close() error {
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if b.closeFn == nil {
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return nil
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}
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return b.closeFn()
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}
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2017-08-30 16:02:11 +00:00
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// Equal returns whether the receiving and given blobs are equal, or in other
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// words, whether they are represented by the same SHA-1 when saved to the
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// object database.
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func (b *Blob) Equal(other *Blob) bool {
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if (b == nil) != (other == nil) {
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return false
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}
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if b != nil {
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return b.Contents == other.Contents &&
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b.Size == other.Size
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}
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return true
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}
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