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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "nsScriptableInputStream.h"
#include "nsMemory.h"
#include "nsString.h"
NS_IMPL_ISUPPORTS(nsScriptableInputStream, nsIScriptableInputStream)
// nsIScriptableInputStream methods
NS_IMETHODIMP
nsScriptableInputStream::Close()
{
if (!mInputStream) {
return NS_ERROR_NOT_INITIALIZED;
}
return mInputStream->Close();
}
NS_IMETHODIMP
nsScriptableInputStream::Init(nsIInputStream* aInputStream)
{
if (!aInputStream) {
return NS_ERROR_NULL_POINTER;
}
mInputStream = aInputStream;
return NS_OK;
}
NS_IMETHODIMP
nsScriptableInputStream::Available(uint64_t* aResult)
{
if (!mInputStream) {
return NS_ERROR_NOT_INITIALIZED;
}
return mInputStream->Available(aResult);
}
NS_IMETHODIMP
nsScriptableInputStream::Read(uint32_t aCount, char** aResult)
{
nsresult rv = NS_OK;
uint64_t count64 = 0;
char* buffer = nullptr;
if (!mInputStream) {
return NS_ERROR_NOT_INITIALIZED;
}
rv = mInputStream->Available(&count64);
if (NS_FAILED(rv)) {
return rv;
}
// bug716556 - Ensure count+1 doesn't overflow
uint32_t count =
XPCOM_MIN((uint32_t)XPCOM_MIN<uint64_t>(count64, aCount), UINT32_MAX - 1);
buffer = (char*)malloc(count + 1); // make room for '\0'
if (!buffer) {
return NS_ERROR_OUT_OF_MEMORY;
}
rv = ReadHelper(buffer, count);
if (NS_FAILED(rv)) {
free(buffer);
return rv;
}
buffer[count] = '\0';
*aResult = buffer;
return NS_OK;
}
NS_IMETHODIMP
nsScriptableInputStream::ReadBytes(uint32_t aCount, nsACString& aResult)
{
if (!mInputStream) {
return NS_ERROR_NOT_INITIALIZED;
}
if (!aResult.SetLength(aCount, fallible)) {
return NS_ERROR_OUT_OF_MEMORY;
}
MOZ_ASSERT(aResult.Length() == aCount);
char* ptr = aResult.BeginWriting();
nsresult rv = ReadHelper(ptr, aCount);
if (NS_FAILED(rv)) {
aResult.Truncate();
}
return rv;
}
nsresult
nsScriptableInputStream::ReadHelper(char* aBuffer, uint32_t aCount)
{
uint32_t totalBytesRead = 0;
while (1) {
uint32_t bytesRead;
nsresult rv = mInputStream->Read(aBuffer + totalBytesRead,
aCount - totalBytesRead,
&bytesRead);
if (NS_FAILED(rv)) {
return rv;
}
totalBytesRead += bytesRead;
if (totalBytesRead == aCount) {
break;
}
// If we have read zero bytes, we have hit EOF.
if (bytesRead == 0) {
return NS_ERROR_FAILURE;
}
}
return NS_OK;
}
nsresult
nsScriptableInputStream::Create(nsISupports* aOuter, REFNSIID aIID,
void** aResult)
{
if (aOuter) {
return NS_ERROR_NO_AGGREGATION;
}
RefPtr<nsScriptableInputStream> sis = new nsScriptableInputStream();
return sis->QueryInterface(aIID, aResult);
}
|
