1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
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 (
"io"
"reflect"
"runtime"
"unsafe"
)
type Blob struct {
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 (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_frombuffer(&id, repo.ptr, unsafe.Pointer(&data[0]), size)
runtime.KeepAlive(repo)
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) 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_fromstream(&stream, repo.ptr, chintPath)
if ecode < 0 {
return nil, MakeGitError(ecode)
}
return newBlobWriteStreamFromC(stream, repo), nil
}
type BlobWriteStream struct {
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_fromstream_commit(&oid, stream.ptr)
runtime.KeepAlive(stream)
if ecode < 0 {
return nil, MakeGitError(ecode)
}
return newOidFromC(&oid), nil
}
|
