intl/uconv/ucvcn/nsUnicodeToHZ.cpp@97036ab72558
intl/uconv/ucvcn/nsUnicodeToHZ.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 /**
6 * A character set converter from Unicode to HZ.
7 *
8 *
9 * @created 08/Sept/1999
10 * @author Yueheng Xu, Yueheng.Xu@intel.com
11 * Revision History
12 * 04/Oct/1999. Yueheng Xu: Fixed line continuation problem when line
13 * ended by '~';
14 * Used table UnicodeToGBK[] to speed up the mapping.
15 */
16 #include "nsUnicodeToHZ.h"
17 #include "gbku.h"
18 //----------------------------------------------------------------------
19 // Class nsUnicodeToGBK [implementation]
20 #define HZ_STATE_GB 1
21 #define HZ_STATE_ASCII 2
22 #define HZ_STATE_TILD 3
23 #define HZLEAD1 '~'
24 #define HZLEAD2 '{'
25 #define HZLEAD3 '}'
26 #define UNICODE_TILD 0x007E
27 nsUnicodeToHZ::nsUnicodeToHZ() : nsEncoderSupport(6)
28 {
29 mHZState = HZ_STATE_ASCII; // per HZ spec, default to HZ mode
30 }
31 NS_IMETHODIMP nsUnicodeToHZ::ConvertNoBuff(
32 const char16_t * aSrc,
33 int32_t * aSrcLength,
34 char * aDest,
35 int32_t * aDestLength)
36 {
37 int32_t i=0;
38 int32_t iSrcLength = *aSrcLength;
39 int32_t iDestLength = 0;
41 for (i=0;i< iSrcLength;i++)
42 {
43 if(! IS_ASCII(*aSrc))
44 {
45 // hi byte has something, it is not ASCII, process as a GB
46 if ( mHZState != HZ_STATE_GB )
47 {
48 // we are adding a '~{' ESC sequence to star a HZ string
49 mHZState = HZ_STATE_GB;
50 aDest[0] = '~';
51 aDest[1] = '{';
52 aDest += 2; // increment 2 bytes
53 iDestLength +=2;
54 }
55 if(mUtil.UnicodeToGBKChar(*aSrc, true, &aDest[0], &aDest[1])) {
56 aDest += 2; // increment 2 bytes
57 iDestLength +=2;
58 } else {
59 // some thing that we cannot convert
60 // xxx fix me ftang
61 // error handling here
62 }
63 } else {
64 // this is an ASCII
66 // if we are in HZ mode, end it by adding a '~}' ESC sequence
67 if ( mHZState == HZ_STATE_GB )
68 {
69 mHZState = HZ_STATE_ASCII;
70 aDest[0] = '~';
71 aDest[1] = '}';
72 aDest += 2; // increment 2 bytes
73 iDestLength +=2;
74 }
76 // if this is a regular char '~' , convert it to two '~'
77 if ( *aSrc == UNICODE_TILD )
78 {
79 aDest[0] = '~';
80 aDest[1] = '~';
81 aDest += 2; // increment 2 bytes
82 iDestLength +=2;
83 } else {
84 // other regular ASCII chars convert by normal ways
86 // Is this works for both little endian and big endian machines ?
87 *aDest = (char) ( (char16_t)(*aSrc) );
88 aDest++; // increment 1 byte
89 iDestLength +=1;
90 }
91 }
92 aSrc++; // increment 2 bytes
93 if ( iDestLength >= (*aDestLength) )
94 {
95 break;
96 }
97 }
98 *aDestLength = iDestLength;
99 *aSrcLength = i;
100 return NS_OK;
101 }
103 NS_IMETHODIMP nsUnicodeToHZ::FinishNoBuff(char * aDest, int32_t * aDestLength)
104 {
105 if ( mHZState == HZ_STATE_GB )
106 {
107 // if we are in HZ mode, end it by adding a '~}' ESC sequence
108 mHZState = HZ_STATE_ASCII;
109 aDest[0] = '~';
110 aDest[1] = '}';
111 *aDestLength = 2;
112 } else {
113 *aDestLength = 0;
114 }
115 return NS_OK;
116 }
