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
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <algorithm>
#include "ArrayBufferInputStream.h"
#include "nsStreamUtils.h"
#include "jsapi.h"
#include "jsfriendapi.h"
NS_IMPL_ISUPPORTS(ArrayBufferInputStream, nsIArrayBufferInputStream, nsIInputStream);
ArrayBufferInputStream::ArrayBufferInputStream()
: mBufferLength(0)
, mPos(0)
, mClosed(false)
{
}
NS_IMETHODIMP
ArrayBufferInputStream::SetData(JS::Handle<JS::Value> aBuffer,
uint32_t aByteOffset,
uint32_t aLength,
JSContext* aCx)
{
if (!aBuffer.isObject()) {
return NS_ERROR_FAILURE;
}
JS::RootedObject arrayBuffer(aCx, &aBuffer.toObject());
if (!JS_IsArrayBufferObject(arrayBuffer)) {
return NS_ERROR_FAILURE;
}
uint32_t buflen = JS_GetArrayBufferByteLength(arrayBuffer);
uint32_t offset = std::min(buflen, aByteOffset);
mBufferLength = std::min(buflen - offset, aLength);
mArrayBuffer = mozilla::MakeUnique<char[]>(mBufferLength);
JS::AutoCheckCannotGC nogc;
bool isShared;
char* src = (char*) JS_GetArrayBufferData(arrayBuffer, &isShared, nogc) + offset;
memcpy(&mArrayBuffer[0], src, mBufferLength);
return NS_OK;
}
NS_IMETHODIMP
ArrayBufferInputStream::Close()
{
mClosed = true;
return NS_OK;
}
NS_IMETHODIMP
ArrayBufferInputStream::Available(uint64_t* aCount)
{
if (mClosed) {
return NS_BASE_STREAM_CLOSED;
}
if (mArrayBuffer) {
*aCount = mBufferLength ? mBufferLength - mPos : 0;
} else {
*aCount = 0;
}
return NS_OK;
}
NS_IMETHODIMP
ArrayBufferInputStream::Read(char* aBuf, uint32_t aCount, uint32_t *aReadCount)
{
return ReadSegments(NS_CopySegmentToBuffer, aBuf, aCount, aReadCount);
}
NS_IMETHODIMP
ArrayBufferInputStream::ReadSegments(nsWriteSegmentFun writer, void *closure,
uint32_t aCount, uint32_t *result)
{
NS_ASSERTION(result, "null ptr");
NS_ASSERTION(mBufferLength >= mPos, "bad stream state");
if (mClosed) {
return NS_BASE_STREAM_CLOSED;
}
MOZ_ASSERT(mArrayBuffer || (mPos == mBufferLength), "stream inited incorrectly");
*result = 0;
while (mPos < mBufferLength) {
uint32_t remaining = mBufferLength - mPos;
MOZ_ASSERT(mArrayBuffer);
uint32_t count = std::min(aCount, remaining);
if (count == 0) {
break;
}
uint32_t written;
nsresult rv = writer(this, closure, &mArrayBuffer[0] + mPos, *result, count, &written);
if (NS_FAILED(rv)) {
// InputStreams do not propagate errors to caller.
return NS_OK;
}
NS_ASSERTION(written <= count,
"writer should not write more than we asked it to write");
mPos += written;
*result += written;
aCount -= written;
}
return NS_OK;
}
NS_IMETHODIMP
ArrayBufferInputStream::IsNonBlocking(bool *aNonBlocking)
{
*aNonBlocking = true;
return NS_OK;
}
|
