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package loose
import (
"errors"
"hash"
"os"
"codeberg.org/lindenii/furgit/internal/compress/zlib"
)
const tempObjectFilePrefix = "tmp_obj_"
// streamWriter incrementally hashes and deflates an object into a temp file.
// Finalize validates size accounting and atomically renames the temp file.
type streamWriter struct {
// store owns path and root operations used by this write session.
store *Store
// file is the temporary destination file under objects/.
file *os.File
// zw compresses raw object bytes into file.
zw *zlib.Writer
// hash receives the same raw bytes used to compute the resulting object ID.
hash hash.Hash
// tmpRelPath is the relative path of file under the objects root.
tmpRelPath string
// fullMode selects full-object input ("type size\0content") as opposed to content-only input.
fullMode bool
// headerBuf accumulates header bytes while fullMode parses up to the first NUL.
headerBuf []byte
// headerDone reports whether the full-object header has been parsed.
headerDone bool
// expectedContentLeft tracks remaining declared content bytes.
expectedContentLeft int64
closed bool
finalized bool
}
// newStreamWriter creates a stream writer with a temp file rooted in objects/.
func (store *Store) newStreamWriter(fullMode bool) (*streamWriter, error) {
hashFn, err := store.algo.New()
if err != nil {
return nil, err
}
tmpRelPath, file, err := store.createTempObjectFile(".")
if err != nil {
return nil, err
}
return &streamWriter{
store: store,
file: file,
zw: zlib.NewWriter(file),
hash: hashFn,
tmpRelPath: tmpRelPath,
fullMode: fullMode,
headerBuf: make([]byte, 0, 64),
}, nil
}
// Write validates and writes raw bytes into the stream.
// In full mode, it parses and enforces the streamed header-declared content size.
func (writer *streamWriter) Write(src []byte) (int, error) {
if writer.finalized {
return 0, errors.New("objectstore/loose: write after finalize")
}
if writer.closed {
return 0, errors.New("objectstore/loose: write after close")
}
if writer.fullMode {
err := writer.acceptFull(src)
if err != nil {
return 0, err
}
} else {
err := writer.acceptContent(int64(len(src)))
if err != nil {
return 0, err
}
}
err := writer.writeRawChunk(src)
if err != nil {
return 0, err
}
return len(src), nil
}
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