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package git
/*
#include <git2.h>
#include <git2/errors.h>
extern int _go_git_odb_foreach(git_odb *db, void *payload);
*/
import "C"
import (
"unsafe"
"reflect"
"runtime"
)
type Odb struct {
ptr *C.git_odb
}
func (v *Odb) Exists(oid *Oid) bool {
ret := C.git_odb_exists(v.ptr, oid.toC())
return ret != 0
}
func (v *Odb) Write(data []byte, otype ObjectType) (oid *Oid, err error) {
oid = new(Oid)
hdr := (*reflect.SliceHeader)(unsafe.Pointer(&data))
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ret := C.git_odb_write(oid.toC(), v.ptr, unsafe.Pointer(hdr.Data), C.size_t(hdr.Len), C.git_otype(otype))
if ret < 0 {
err = MakeGitError(ret)
}
return
}
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())
if ret < 0 {
return nil, MakeGitError(ret)
}
runtime.SetFinalizer(obj, (*OdbObject).Free)
return
}
//export odbForEachCb
func odbForEachCb(id *C.git_oid, payload unsafe.Pointer) int {
ch := *(*chan *Oid)(payload)
oid := newOidFromC(id)
// Because the channel is unbuffered, we never read our own data. If ch is
// readable, the user has sent something on it, which means we should
// abort.
select {
case ch <- oid:
case <-ch:
return -1
}
return 0;
}
func (v *Odb) forEachWrap(ch chan *Oid) {
C._go_git_odb_foreach(v.ptr, unsafe.Pointer(&ch))
close(ch)
}
func (v *Odb) ForEach() chan *Oid {
ch := make(chan *Oid, 0)
go v.forEachWrap(ch)
return ch
}
// 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));
if ret < 0 {
err = LastError()
}
return
}
// 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)
ret := C.git_odb_open_rstream(&stream.ptr, v.ptr, id.toC())
if ret < 0 {
return nil, LastError()
}
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 int, otype ObjectType) (*OdbWriteStream, error) {
stream := new(OdbWriteStream)
ret := C.git_odb_open_wstream(&stream.ptr, v.ptr, C.size_t(size), C.git_otype(otype))
if ret < 0 {
return nil, LastError()
}
runtime.SetFinalizer(stream, (*OdbWriteStream).Free)
return stream, nil
}
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) {
return newOidFromC(C.git_odb_object_id(object.ptr))
}
func (object *OdbObject) Len() (len uint64) {
return uint64(C.git_odb_object_size(object.ptr))
}
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
}
// 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)
ret := C.git_odb_stream_read(stream.ptr, ptr, size)
if ret < 0 {
return 0, LastError()
}
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)
ret := C.git_odb_stream_write(stream.ptr, ptr, size)
if ret < 0 {
return 0, LastError()
}
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 {
ret := C.git_odb_stream_finalize_write(stream.Id.toC(), stream.ptr)
if ret < 0 {
return LastError()
}
return nil
}
func (stream *OdbWriteStream) Free() {
runtime.SetFinalizer(stream, nil)
C.git_odb_stream_free(stream.ptr)
}
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