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package packed
import (
"bytes"
"fmt"
"io"
"codeberg.org/lindenii/furgit/internal/iolimit"
"codeberg.org/lindenii/furgit/objectheader"
"codeberg.org/lindenii/furgit/objectid"
"codeberg.org/lindenii/furgit/objecttype"
packfmt "codeberg.org/lindenii/furgit/packfile"
)
// ReadReaderContent reads an object's type, declared content size, and content
// stream.
//
// The caller must close the returned reader.
//
// For base pack entries, the returned reader borrows store-owned mapped pack
// data and is only valid until the store is closed.
//
// Close releases reader-local resources only. It does not drain unread data for
// additional validation. In particular, malformed trailing compressed data,
// trailing bytes past the declared object size, and the zlib Adler-32 trailer
// may go unverified unless the caller reads to io.EOF.
func (store *Store) ReadReaderContent(id objectid.ObjectID) (objecttype.Type, int64, io.ReadCloser, error) {
loc, err := store.lookup(id)
if err != nil {
return objecttype.TypeInvalid, 0, nil, err
}
pack, meta, err := store.entryMetaAt(loc)
if err != nil {
return objecttype.TypeInvalid, 0, nil, err
}
if packfmt.IsBaseObjectType(meta.ty) {
zr, err := zlibReaderAt(pack, meta.dataOffset)
if err != nil {
return objecttype.TypeInvalid, 0, nil, err
}
return meta.ty, meta.size, &readCloser{
reader: iolimit.ExpectLengthReader(zr, meta.size),
closer: zr,
}, nil
}
ty, content, err := store.deltaResolveContent(loc)
if err != nil {
return objecttype.TypeInvalid, 0, nil, err
}
return ty, int64(len(content)), io.NopCloser(bytes.NewReader(content)), nil
}
// ReadReaderFull reads a full serialized object stream as "type size\0content".
//
// The caller must close the returned reader.
//
// For base pack entries, the returned reader borrows store-owned mapped pack
// data and is only valid until the store is closed.
//
// Close releases reader-local resources only. It does not drain unread data for
// additional validation. In particular, malformed trailing compressed data,
// trailing bytes past the declared object size, and the zlib Adler-32 trailer
// may go unverified unless the caller reads to io.EOF.
func (store *Store) ReadReaderFull(id objectid.ObjectID) (io.ReadCloser, error) {
loc, err := store.lookup(id)
if err != nil {
return nil, err
}
pack, meta, err := store.entryMetaAt(loc)
if err != nil {
return nil, err
}
if packfmt.IsBaseObjectType(meta.ty) {
header, ok := objectheader.Encode(meta.ty, meta.size)
if !ok {
return nil, fmt.Errorf("objectstore/packed: failed to encode object header for type %d", meta.ty)
}
zr, err := zlibReaderAt(pack, meta.dataOffset)
if err != nil {
return nil, err
}
return &readCloser{
reader: io.MultiReader(bytes.NewReader(header), iolimit.ExpectLengthReader(zr, meta.size)),
closer: zr,
}, nil
}
raw, err := store.ReadBytesFull(id)
if err != nil {
return nil, err
}
return io.NopCloser(bytes.NewReader(raw)), nil
}
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