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package git
/*
#include <git2.h>
#include <string.h>
extern int _go_git_blob_create_fromchunks(git_oid *id,
git_repository *repo,
const char *hintpath,
void *payload);
*/
import "C"
import (
"io"
"runtime"
"unsafe"
)
type Blob struct {
Object
cast_ptr *C.git_blob
}
func (v *Blob) Size() int64 {
return int64(C.git_blob_rawsize(v.cast_ptr))
}
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))
return C.GoBytes(buffer, size)
}
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 waht 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_frombuffer(&id, repo.ptr, unsafe.Pointer(&data[0]), size)
if ecode < 0 {
return nil, MakeGitError(ecode)
}
return newOidFromC(&id), nil
}
type BlobChunkCallback func(maxLen int) ([]byte, error)
type BlobCallbackData struct {
Callback BlobChunkCallback
Error error
}
//export blobChunkCb
func blobChunkCb(buffer *C.char, maxLen C.size_t, handle unsafe.Pointer) int {
payload := pointerHandles.Get(handle)
data, ok := payload.(*BlobCallbackData)
if !ok {
panic("could not retrieve blob callback data")
}
goBuf, err := data.Callback(int(maxLen))
if err == io.EOF {
return 0
} else if err != nil {
data.Error = err
return -1
}
C.memcpy(unsafe.Pointer(buffer), unsafe.Pointer(&goBuf[0]), C.size_t(len(goBuf)))
return len(goBuf)
}
func (repo *Repository) CreateBlobFromChunks(hintPath string, callback BlobChunkCallback) (*Oid, error) {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
var chintPath *C.char = nil
if len(hintPath) > 0 {
chintPath = C.CString(hintPath)
defer C.free(unsafe.Pointer(chintPath))
}
oid := C.git_oid{}
payload := &BlobCallbackData{Callback: callback}
handle := pointerHandles.Track(payload)
defer pointerHandles.Untrack(handle)
ecode := C._go_git_blob_create_fromchunks(&oid, repo.ptr, chintPath, handle)
if payload.Error != nil {
return nil, payload.Error
}
if ecode < 0 {
return nil, MakeGitError(ecode)
}
return newOidFromC(&oid), nil
}
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