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package loose
import (
"bufio"
"fmt"
"io"
"os"
"lindenii.org/go/furgit/internal/compress/zlib"
"lindenii.org/go/furgit/object/header"
"lindenii.org/go/furgit/object/store"
"lindenii.org/go/furgit/object/typ"
)
// decodeAll inflates the full loose object payload from file.
func decodeAll(file *os.File) ([]byte, error) {
zr, err := zlib.NewReader(file)
if err != nil {
return nil, fmt.Errorf("object/store/loose: %w", err)
}
defer func() { _ = zr.Close() }()
data, err := io.ReadAll(zr)
if err != nil {
return nil, fmt.Errorf("object/store/loose: %w", err)
}
return data, nil
}
// parseRaw parses a loose object payload in "type size\x00content" format.
func parseRaw(raw []byte) (typ.Type, []byte, error) {
ty, size, consumed, err := header.Parse(raw)
if err != nil {
return typ.TypeUnknown, nil, fmt.Errorf("%w: %w", store.ErrInvalidObject, err)
}
content := raw[consumed:]
if uint64(len(content)) != size {
return typ.TypeUnknown, nil, fmt.Errorf("%w: header size/content mismatch", store.ErrInvalidObject)
}
return ty, content, nil
}
// readHeader reads and parses a loose object header from br,
// and returns the raw header bytes including the trailing NUL.
func readHeader(br *bufio.Reader) ([]byte, typ.Type, uint64, error) {
headerBytes, err := br.ReadSlice(0)
if err != nil {
return nil, typ.TypeUnknown, 0, fmt.Errorf("object/store/loose: %w", err)
}
ty, size, _, err := header.Parse(headerBytes)
if err != nil {
return nil, typ.TypeUnknown, 0, fmt.Errorf("%w: %w", store.ErrInvalidObject, err)
}
return headerBytes, ty, size, nil
}
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