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blob.go
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blob.go
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package git
/*
#include <git2.h>
#include <string.h>
int _go_git_writestream_write(git_writestream *stream, const char *buffer, size_t len);
void _go_git_writestream_free(git_writestream *stream);
*/
import "C"
import (
"reflect"
"runtime"
"unsafe"
)
type Blob struct {
doNotCompare
Object
cast_ptr *C.git_blob
}
func (b *Blob) AsObject() *Object {
return &b.Object
}
func (v *Blob) Size() int64 {
ret := int64(C.git_blob_rawsize(v.cast_ptr))
runtime.KeepAlive(v)
return ret
}
func (v *Blob) Contents() []byte {
size := C.int(C.git_blob_rawsize(v.cast_ptr))
buffer := unsafe.Pointer(C.git_blob_rawcontent(v.cast_ptr))
goBytes := C.GoBytes(buffer, size)
runtime.KeepAlive(v)
return goBytes
}
func (v *Blob) IsBinary() bool {
ret := C.git_blob_is_binary(v.cast_ptr) == 1
runtime.KeepAlive(v)
return ret
}
func (repo *Repository) CreateBlobFromBuffer(data []byte) (*Oid, error) {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
var id C.git_oid
var size C.size_t
// Go 1.6 added some increased checking of passing pointer to
// C, but its check depends on its expectations of what we
// pass to the C function, so unless we take the address of
// its contents at the call site itself, it can fail when
// 'data' is a slice of a slice.
//
// When we're given an empty slice, create a dummy one where 0
// isn't out of bounds.
if len(data) > 0 {
size = C.size_t(len(data))
} else {
data = []byte{0}
size = C.size_t(0)
}
ecode := C.git_blob_create_from_buffer(&id, repo.ptr, unsafe.Pointer(&data[0]), size)
runtime.KeepAlive(repo)
if ecode < 0 {
return nil, MakeGitError(ecode)
}
return newOidFromC(&id), nil
}
func (repo *Repository) CreateFromStream(hintPath string) (*BlobWriteStream, error) {
var chintPath *C.char = nil
var stream *C.git_writestream
if len(hintPath) > 0 {
chintPath = C.CString(hintPath)
defer C.free(unsafe.Pointer(chintPath))
}
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ecode := C.git_blob_create_from_stream(&stream, repo.ptr, chintPath)
if ecode < 0 {
return nil, MakeGitError(ecode)
}
return newBlobWriteStreamFromC(stream, repo), nil
}
type BlobWriteStream struct {
doNotCompare
ptr *C.git_writestream
repo *Repository
}
func newBlobWriteStreamFromC(ptr *C.git_writestream, repo *Repository) *BlobWriteStream {
stream := &BlobWriteStream{
ptr: ptr,
repo: repo,
}
runtime.SetFinalizer(stream, (*BlobWriteStream).Free)
return stream
}
// Implement io.Writer
func (stream *BlobWriteStream) Write(p []byte) (int, error) {
header := (*reflect.SliceHeader)(unsafe.Pointer(&p))
ptr := (*C.char)(unsafe.Pointer(header.Data))
size := C.size_t(header.Len)
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ecode := C._go_git_writestream_write(stream.ptr, ptr, size)
runtime.KeepAlive(stream)
if ecode < 0 {
return 0, MakeGitError(ecode)
}
return len(p), nil
}
func (stream *BlobWriteStream) Free() {
runtime.SetFinalizer(stream, nil)
C._go_git_writestream_free(stream.ptr)
}
func (stream *BlobWriteStream) Commit() (*Oid, error) {
oid := C.git_oid{}
runtime.LockOSThread()
defer runtime.UnlockOSThread()
ecode := C.git_blob_create_from_stream_commit(&oid, stream.ptr)
runtime.KeepAlive(stream)
if ecode < 0 {
return nil, MakeGitError(ecode)
}
return newOidFromC(&oid), nil
}