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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=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 "mozilla/dom/LSValue.h"
#include "mozIStorageStatement.h"
#include "mozilla/TextUtils.h"
#include "mozilla/dom/SnappyUtils.h"
#include "mozilla/fallible.h"
#include "nsDebug.h"
#include "nsError.h"
namespace mozilla::dom {
namespace {
bool PutStringBytesToCString(const nsAString& aSrc, nsCString& aDest) {
const char16_t* bufferData;
const size_t byteLength = sizeof(char16_t) * aSrc.GetData(&bufferData);
char* destDataPtr;
const auto newLength = aDest.GetMutableData(&destDataPtr, byteLength);
if (newLength != byteLength) {
return false;
}
std::memcpy(static_cast<void*>(destDataPtr),
static_cast<const void*>(bufferData), byteLength);
return true;
}
template <class T>
using TypeBufferResult = Result<std::pair<T, nsCString>, nsresult>;
} // namespace
bool PutCStringBytesToString(const nsACString& aSrc, nsString& aDest) {
const char* bufferData;
const size_t byteLength = aSrc.GetData(&bufferData);
const size_t shortLength = byteLength / sizeof(char16_t);
char16_t* destDataPtr;
const auto newLength = aDest.GetMutableData(&destDataPtr, shortLength);
if (newLength != shortLength) {
return false;
}
std::memcpy(static_cast<void*>(destDataPtr),
static_cast<const void*>(bufferData), byteLength);
return true;
}
LSValue::Converter::Converter(const LSValue& aValue) {
using ConversionType = LSValue::ConversionType;
using CompressionType = LSValue::CompressionType;
if (aValue.mBuffer.IsVoid()) {
mBuffer.SetIsVoid(true);
return;
}
const CompressionType compressionType = aValue.GetCompressionType();
const ConversionType conversionType = aValue.GetConversionType();
const nsCString uncompressed = [compressionType, &aValue]() {
if (CompressionType::UNCOMPRESSED != compressionType) {
nsCString buffer;
MOZ_ASSERT(CompressionType::SNAPPY == compressionType);
if (NS_WARN_IF(!SnappyUncompress(aValue.mBuffer, buffer))) {
buffer.Truncate();
}
return buffer;
}
return aValue.mBuffer;
}();
if (ConversionType::NONE != conversionType) {
MOZ_ASSERT(ConversionType::UTF16_UTF8 == conversionType);
if (NS_WARN_IF(!CopyUTF8toUTF16(uncompressed, mBuffer, fallible))) {
mBuffer.SetIsVoid(true);
}
return;
}
if (NS_WARN_IF(!PutCStringBytesToString(uncompressed, mBuffer))) {
mBuffer.SetIsVoid(true);
}
}
bool LSValue::InitFromString(const nsAString& aBuffer) {
MOZ_ASSERT(mBuffer.IsVoid());
MOZ_ASSERT(!mUTF16Length);
MOZ_ASSERT(ConversionType::NONE == mConversionType);
MOZ_ASSERT(CompressionType::UNCOMPRESSED == mCompressionType);
if (aBuffer.IsVoid()) {
return true;
}
const uint32_t utf16Length = aBuffer.Length();
const auto conversionRes = [&aBuffer]() -> TypeBufferResult<ConversionType> {
nsCString converted;
if (Utf16ValidUpTo(aBuffer) == aBuffer.Length()) {
if (NS_WARN_IF(!CopyUTF16toUTF8(aBuffer, converted, fallible))) {
return Err(NS_ERROR_OUT_OF_MEMORY);
}
return std::pair{ConversionType::UTF16_UTF8, std::move(converted)};
}
if (NS_WARN_IF(!PutStringBytesToCString(aBuffer, converted))) {
return Err(NS_ERROR_OUT_OF_MEMORY);
}
return std::pair{ConversionType::NONE, std::move(converted)};
}();
if (conversionRes.isErr()) {
return false;
}
const auto& [conversionType, converted] = conversionRes.inspect();
const auto compressionRes =
[&converted = converted]() -> TypeBufferResult<CompressionType> {
nsCString compressed;
if (NS_WARN_IF(!SnappyCompress(converted, compressed))) {
return Err(NS_ERROR_OUT_OF_MEMORY);
}
if (!compressed.IsVoid()) {
return std::pair{CompressionType::SNAPPY, std::move(compressed)};
}
compressed = converted;
return std::pair{CompressionType::UNCOMPRESSED, std::move(compressed)};
}();
if (compressionRes.isErr()) {
return false;
}
const auto& [compressionType, compressed] = compressionRes.inspect();
mBuffer = compressed;
mUTF16Length = utf16Length;
mConversionType = conversionType;
mCompressionType = compressionType;
return true;
}
nsresult LSValue::InitFromStatement(mozIStorageStatement* aStatement,
uint32_t aIndex) {
MOZ_ASSERT(aStatement);
MOZ_ASSERT(mBuffer.IsVoid());
MOZ_ASSERT(!mUTF16Length);
MOZ_ASSERT(ConversionType::NONE == mConversionType);
MOZ_ASSERT(CompressionType::UNCOMPRESSED == mCompressionType);
int32_t utf16Length;
nsresult rv = aStatement->GetInt32(aIndex, &utf16Length);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
int32_t conversionType;
rv = aStatement->GetInt32(aIndex + 1, &conversionType);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
int32_t compressionType;
rv = aStatement->GetInt32(aIndex + 2, &compressionType);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
nsCString buffer;
rv = aStatement->GetBlobAsUTF8String(aIndex + 3, buffer);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
mBuffer = buffer;
mUTF16Length = static_cast<uint32_t>(utf16Length);
mConversionType = static_cast<decltype(mConversionType)>(conversionType);
mCompressionType = static_cast<decltype(mCompressionType)>(compressionType);
return NS_OK;
}
const LSValue& VoidLSValue() {
static const LSValue sVoidLSValue;
return sVoidLSValue;
}
} // namespace mozilla::dom
|
