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
203
204
205
206
207
208
|
/* -*- Mode: C++; tab-width: 2; 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/. */
//
// Part of the reason these routines are all in once place is so that as new
// data flavors are added that are known to be one-byte or two-byte strings, or even
// raw binary data, then we just have to go to one place to change how the data
// moves into/out of the primitives and native line endings.
//
// If you add new flavors that have special consideration (binary data or one-byte
// char* strings), please update all the helper classes in this file.
//
// For now, this is the assumption that we are making:
// - text/plain is always a char*
// - anything else is a char16_t*
//
#include "nsPrimitiveHelpers.h"
#include "mozilla/UniquePtr.h"
#include "nsCOMPtr.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsITransferable.h"
#include "nsIComponentManager.h"
#include "nsLinebreakConverter.h"
#include "nsReadableUtils.h"
//
// CreatePrimitiveForData
//
// Given some data and the flavor it corresponds to, creates the appropriate
// nsISupports* wrapper for passing across IDL boundaries. Right now, everything
// creates a two-byte |nsISupportsString|, except for "text/plain" and native
// platform HTML (CF_HTML on win32)
//
void
nsPrimitiveHelpers :: CreatePrimitiveForData ( const char* aFlavor, const void* aDataBuff,
uint32_t aDataLen, nsISupports** aPrimitive )
{
if ( !aPrimitive )
return;
if ( strcmp(aFlavor,kTextMime) == 0 || strcmp(aFlavor,kNativeHTMLMime) == 0 ||
strcmp(aFlavor,kRTFMime) == 0 || strcmp(aFlavor,kCustomTypesMime) == 0) {
nsCOMPtr<nsISupportsCString> primitive =
do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID);
if ( primitive ) {
const char * start = reinterpret_cast<const char*>(aDataBuff);
primitive->SetData(Substring(start, start + aDataLen));
NS_ADDREF(*aPrimitive = primitive);
}
}
else {
nsCOMPtr<nsISupportsString> primitive =
do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID);
if (primitive ) {
if (aDataLen % 2) {
auto buffer = mozilla::MakeUnique<char[]>(aDataLen + 1);
if (!MOZ_LIKELY(buffer))
return;
memcpy(buffer.get(), aDataBuff, aDataLen);
buffer[aDataLen] = 0;
const char16_t* start = reinterpret_cast<const char16_t*>(buffer.get());
// recall that length takes length as characters, not bytes
primitive->SetData(Substring(start, start + (aDataLen + 1) / 2));
} else {
const char16_t* start = reinterpret_cast<const char16_t*>(aDataBuff);
// recall that length takes length as characters, not bytes
primitive->SetData(Substring(start, start + (aDataLen / 2)));
}
NS_ADDREF(*aPrimitive = primitive);
}
}
} // CreatePrimitiveForData
//
// CreatePrimitiveForCFHTML
//
// Platform specific CreatePrimitive, windows CF_HTML.
//
void
nsPrimitiveHelpers :: CreatePrimitiveForCFHTML ( const void* aDataBuff,
uint32_t* aDataLen, nsISupports** aPrimitive )
{
if (!aPrimitive)
return;
nsCOMPtr<nsISupportsString> primitive =
do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID);
if (!primitive)
return;
// We need to duplicate the input buffer, since the removal of linebreaks
// might reallocte it.
void* utf8 = moz_xmalloc(*aDataLen);
if (!utf8)
return;
memcpy(utf8, aDataBuff, *aDataLen);
int32_t signedLen = static_cast<int32_t>(*aDataLen);
nsLinebreakHelpers::ConvertPlatformToDOMLinebreaks(kTextMime, &utf8, &signedLen);
*aDataLen = signedLen;
nsAutoString str(NS_ConvertUTF8toUTF16(reinterpret_cast<const char*>(utf8), *aDataLen));
free(utf8);
*aDataLen = str.Length() * sizeof(char16_t);
primitive->SetData(str);
NS_ADDREF(*aPrimitive = primitive);
}
//
// CreateDataFromPrimitive
//
// Given a nsISupports* primitive and the flavor it represents, creates a new data
// buffer with the data in it. This data will be null terminated, but the length
// parameter does not reflect that.
//
void
nsPrimitiveHelpers :: CreateDataFromPrimitive ( const char* aFlavor, nsISupports* aPrimitive,
void** aDataBuff, uint32_t aDataLen )
{
if ( !aDataBuff )
return;
*aDataBuff = nullptr;
if ( strcmp(aFlavor,kTextMime) == 0 || strcmp(aFlavor,kCustomTypesMime) == 0) {
nsCOMPtr<nsISupportsCString> plainText ( do_QueryInterface(aPrimitive) );
if ( plainText ) {
nsAutoCString data;
plainText->GetData ( data );
*aDataBuff = ToNewCString(data);
}
}
else {
nsCOMPtr<nsISupportsString> doubleByteText ( do_QueryInterface(aPrimitive) );
if ( doubleByteText ) {
nsAutoString data;
doubleByteText->GetData ( data );
*aDataBuff = ToNewUnicode(data);
}
}
}
//
// ConvertPlatformToDOMLinebreaks
//
// Given some data, convert from the platform linebreaks into the LF expected by the
// DOM. This will attempt to convert the data in place, but the buffer may still need to
// be reallocated regardless (disposing the old buffer is taken care of internally, see
// the note below).
//
// NOTE: this assumes that it can use 'free' to dispose of the old buffer.
//
nsresult
nsLinebreakHelpers :: ConvertPlatformToDOMLinebreaks ( const char* inFlavor, void** ioData,
int32_t* ioLengthInBytes )
{
NS_ASSERTION ( ioData && *ioData && ioLengthInBytes, "Bad Params");
if ( !(ioData && *ioData && ioLengthInBytes) )
return NS_ERROR_INVALID_ARG;
nsresult retVal = NS_OK;
if ( strcmp(inFlavor, kTextMime) == 0 || strcmp(inFlavor, kRTFMime) == 0) {
char* buffAsChars = reinterpret_cast<char*>(*ioData);
char* oldBuffer = buffAsChars;
retVal = nsLinebreakConverter::ConvertLineBreaksInSitu ( &buffAsChars, nsLinebreakConverter::eLinebreakAny,
nsLinebreakConverter::eLinebreakContent,
*ioLengthInBytes, ioLengthInBytes );
if ( NS_SUCCEEDED(retVal) ) {
if ( buffAsChars != oldBuffer ) // check if buffer was reallocated
free ( oldBuffer );
*ioData = buffAsChars;
}
}
else if ( strcmp(inFlavor, "image/jpeg") == 0 ) {
// I'd assume we don't want to do anything for binary data....
}
else {
char16_t* buffAsUnichar = reinterpret_cast<char16_t*>(*ioData);
char16_t* oldBuffer = buffAsUnichar;
int32_t newLengthInChars;
retVal = nsLinebreakConverter::ConvertUnicharLineBreaksInSitu ( &buffAsUnichar, nsLinebreakConverter::eLinebreakAny,
nsLinebreakConverter::eLinebreakContent,
*ioLengthInBytes / sizeof(char16_t), &newLengthInChars );
if ( NS_SUCCEEDED(retVal) ) {
if ( buffAsUnichar != oldBuffer ) // check if buffer was reallocated
free ( oldBuffer );
*ioData = buffAsUnichar;
*ioLengthInBytes = newLengthInChars * sizeof(char16_t);
}
}
return retVal;
} // ConvertPlatformToDOMLinebreaks
|
