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package git
/*
#include <git2.h>
extern int _go_git_odb_foreach(git_odb *db, void *payload);
extern void _go_git_odb_backend_free(git_odb_backend *backend);
*/
import "C"
import (
"reflect"
"runtime"
"unsafe"
)
type Odb struct {
ptr *C.git_odb
}
type OdbBackend struct {
ptr *C.git_odb_backend
}
func NewOdb() (odb *Odb, err error) {
odb = new(Odb)
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_new(&odb.ptr)
if ret < 0 {
return nil, MakeGitError(ret)
}
runtime.SetFinalizer(odb, (*Odb).Free)
return odb, nil
}
func NewOdbBackendFromC(ptr unsafe.Pointer) (backend *OdbBackend) {
backend = &OdbBackend{(*C.git_odb_backend)(ptr)}
return backend
}
func (v *Odb) AddBackend(backend *OdbBackend, priority int) (err error) {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_add_backend(v.ptr, backend.ptr, C.int(priority))
runtime.KeepAlive(v)
if ret < 0 {
backend.Free()
return MakeGitError(ret)
}
return nil
}
func (v *Odb) ReadHeader(oid *Oid) (uint64, ObjectType, error) {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
var sz C.size_t
var cotype C.git_otype
ret := C.git_odb_read_header(&sz, &cotype, v.ptr, oid.toC())
runtime.KeepAlive(v)
if ret < 0 {
return 0, C.GIT_OBJ_BAD, MakeGitError(ret)
}
return uint64(sz), ObjectType(cotype), nil
}
func (v *Odb) Exists(oid *Oid) bool {
ret := C.git_odb_exists(v.ptr, oid.toC())
runtime.KeepAlive(v)
runtime.KeepAlive(oid)
return ret != 0
}
func (v *Odb) Write(data []byte, otype ObjectType) (oid *Oid, err error) {
oid = new(Oid)
var cptr unsafe.Pointer
if len(data) > 0 {
cptr = unsafe.Pointer(&data[0])
}
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_write(oid.toC(), v.ptr, cptr, C.size_t(len(data)), C.git_otype(otype))
runtime.KeepAlive(v)
if ret < 0 {
return nil, MakeGitError(ret)
}
return oid, nil
}
func (v *Odb) Read(oid *Oid) (obj *OdbObject, err error) {
obj = new(OdbObject)
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_read(&obj.ptr, v.ptr, oid.toC())
runtime.KeepAlive(v)
runtime.KeepAlive(oid)
if ret < 0 {
return nil, MakeGitError(ret)
}
runtime.SetFinalizer(obj, (*OdbObject).Free)
return obj, nil
}
type OdbForEachCallback func(id *Oid) error
type foreachData struct {
callback OdbForEachCallback
err error
}
//export odbForEachCb
func odbForEachCb(id *C.git_oid, handle unsafe.Pointer) int {
data, ok := pointerHandles.Get(handle).(*foreachData)
if !ok {
panic("could not retrieve handle")
}
err := data.callback(newOidFromC(id))
if err != nil {
data.err = err
return C.GIT_EUSER
}
return 0
}
func (v *Odb) ForEach(callback OdbForEachCallback) error {
data := foreachData{
callback: callback,
err: nil,
}
runtime.LockOSThread()
defer runtime.UnlockOSThread()
handle := pointerHandles.Track(&data)
defer pointerHandles.Untrack(handle)
ret := C._go_git_odb_foreach(v.ptr, handle)
runtime.KeepAlive(v)
if ret == C.GIT_EUSER {
return data.err
} else if ret < 0 {
return MakeGitError(ret)
}
return nil
}
// Hash determines the object-ID (sha1) of a data buffer.
func (v *Odb) Hash(data []byte, otype ObjectType) (oid *Oid, err error) {
oid = new(Oid)
header := (*reflect.SliceHeader)(unsafe.Pointer(&data))
ptr := unsafe.Pointer(header.Data)
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_hash(oid.toC(), ptr, C.size_t(header.Len), C.git_otype(otype))
runtime.KeepAlive(data)
if ret < 0 {
return nil, MakeGitError(ret)
}
return oid, nil
}
// NewReadStream opens a read stream from the ODB. Reading from it will give you the
// contents of the object.
func (v *Odb) NewReadStream(id *Oid) (*OdbReadStream, error) {
stream := new(OdbReadStream)
var ctype C.git_otype
var csize C.size_t
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_open_rstream(&stream.ptr, &csize, &ctype, v.ptr, id.toC())
runtime.KeepAlive(v)
runtime.KeepAlive(id)
if ret < 0 {
return nil, MakeGitError(ret)
}
stream.Size = uint64(csize)
stream.Type = ObjectType(ctype)
runtime.SetFinalizer(stream, (*OdbReadStream).Free)
return stream, nil
}
// NewWriteStream opens a write stream to the ODB, which allows you to
// create a new object in the database. The size and type must be
// known in advance
func (v *Odb) NewWriteStream(size int64, otype ObjectType) (*OdbWriteStream, error) {
stream := new(OdbWriteStream)
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_open_wstream(&stream.ptr, v.ptr, C.git_off_t(size), C.git_otype(otype))
runtime.KeepAlive(v)
if ret < 0 {
return nil, MakeGitError(ret)
}
runtime.SetFinalizer(stream, (*OdbWriteStream).Free)
return stream, nil
}
func (v *OdbBackend) Free() {
C._go_git_odb_backend_free(v.ptr)
}
type OdbObject struct {
ptr *C.git_odb_object
}
func (v *OdbObject) Free() {
runtime.SetFinalizer(v, nil)
C.git_odb_object_free(v.ptr)
}
func (object *OdbObject) Id() (oid *Oid) {
ret := newOidFromC(C.git_odb_object_id(object.ptr))
runtime.KeepAlive(object)
return ret
}
func (object *OdbObject) Len() (len uint64) {
ret := uint64(C.git_odb_object_size(object.ptr))
runtime.KeepAlive(object)
return ret
}
func (object *OdbObject) Type() ObjectType {
ret := ObjectType(C.git_odb_object_type(object.ptr))
runtime.KeepAlive(object)
return ret
}
// Data returns a slice pointing to the unmanaged object memory. You must make
// sure the object is referenced for at least as long as the slice is used.
func (object *OdbObject) Data() (data []byte) {
var c_blob unsafe.Pointer = C.git_odb_object_data(object.ptr)
var blob []byte
len := int(C.git_odb_object_size(object.ptr))
sliceHeader := (*reflect.SliceHeader)((unsafe.Pointer(&blob)))
sliceHeader.Cap = len
sliceHeader.Len = len
sliceHeader.Data = uintptr(c_blob)
return blob
}
type OdbReadStream struct {
ptr *C.git_odb_stream
Size uint64
Type ObjectType
}
// Read reads from the stream
func (stream *OdbReadStream) Read(data []byte) (int, error) {
header := (*reflect.SliceHeader)(unsafe.Pointer(&data))
ptr := (*C.char)(unsafe.Pointer(header.Data))
size := C.size_t(header.Cap)
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_stream_read(stream.ptr, ptr, size)
runtime.KeepAlive(stream)
if ret < 0 {
return 0, MakeGitError(ret)
}
header.Len = int(ret)
return len(data), nil
}
// Close is a dummy function in order to implement the Closer and
// ReadCloser interfaces
func (stream *OdbReadStream) Close() error {
return nil
}
func (stream *OdbReadStream) Free() {
runtime.SetFinalizer(stream, nil)
C.git_odb_stream_free(stream.ptr)
}
type OdbWriteStream struct {
ptr *C.git_odb_stream
Id Oid
}
// Write writes to the stream
func (stream *OdbWriteStream) Write(data []byte) (int, error) {
header := (*reflect.SliceHeader)(unsafe.Pointer(&data))
ptr := (*C.char)(unsafe.Pointer(header.Data))
size := C.size_t(header.Len)
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_stream_write(stream.ptr, ptr, size)
runtime.KeepAlive(stream)
if ret < 0 {
return 0, MakeGitError(ret)
}
return len(data), nil
}
// Close signals that all the data has been written and stores the
// resulting object id in the stream's Id field.
func (stream *OdbWriteStream) Close() error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_stream_finalize_write(stream.Id.toC(), stream.ptr)
runtime.KeepAlive(stream)
if ret < 0 {
return MakeGitError(ret)
}
return nil
}
func (stream *OdbWriteStream) Free() {
runtime.SetFinalizer(stream, nil)
C.git_odb_stream_free(stream.ptr)
}
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