The Tor Browser: js/public/CharacterEncoding.h@97036ab72558 (annotated)

js/public/CharacterEncoding.h@97036ab72558 (annotated)

js/public/CharacterEncoding.h

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.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  * vim: set ts=8 sts=4 et sw=4 tw=99:
  * 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/. */
 #ifndef js_CharacterEncoding_h
 #define js_CharacterEncoding_h
 #include "mozilla/NullPtr.h"
 #include "mozilla/Range.h"
 #include "js/TypeDecls.h"
 #include "js/Utility.h"
 namespace js {
 struct ThreadSafeContext;
 }
 namespace JS {
 /*
  * By default, all C/C++ 1-byte-per-character strings passed into the JSAPI
  * are treated as ISO/IEC 8859-1, also known as Latin-1. That is, each
  * byte is treated as a 2-byte character, and there is no way to pass in a
  * string containing characters beyond U+00FF.
  */
 class Latin1Chars : public mozilla::Range<unsigned char>
 {
     typedef mozilla::Range<unsigned char> Base;
   public:
     Latin1Chars() : Base() {}
     Latin1Chars(char *aBytes, size_t aLength) : Base(reinterpret_cast<unsigned char *>(aBytes), aLength) {}
     Latin1Chars(const char *aBytes, size_t aLength)
       : Base(reinterpret_cast<unsigned char *>(const_cast<char *>(aBytes)), aLength)
     {}
 };
 /*
  * A Latin1Chars, but with \0 termination for C compatibility.
  */
 class Latin1CharsZ : public mozilla::RangedPtr<unsigned char>
 {
     typedef mozilla::RangedPtr<unsigned char> Base;
   public:
     Latin1CharsZ() : Base(nullptr, 0) {}
     Latin1CharsZ(char *aBytes, size_t aLength)
       : Base(reinterpret_cast<unsigned char *>(aBytes), aLength)
     {
         MOZ_ASSERT(aBytes[aLength] == '\0');
     }
     Latin1CharsZ(unsigned char *aBytes, size_t aLength)
       : Base(aBytes, aLength)
     {
         MOZ_ASSERT(aBytes[aLength] == '\0');
     }
     using Base::operator=;
     char *c_str() { return reinterpret_cast<char *>(get()); }
 };
 class UTF8Chars : public mozilla::Range<unsigned char>
 {
     typedef mozilla::Range<unsigned char> Base;
   public:
     UTF8Chars() : Base() {}
     UTF8Chars(char *aBytes, size_t aLength)
       : Base(reinterpret_cast<unsigned char *>(aBytes), aLength)
     {}
     UTF8Chars(const char *aBytes, size_t aLength)
       : Base(reinterpret_cast<unsigned char *>(const_cast<char *>(aBytes)), aLength)
     {}
 };
 /*
  * SpiderMonkey also deals directly with UTF-8 encoded text in some places.
  */
 class UTF8CharsZ : public mozilla::RangedPtr<unsigned char>
 {
     typedef mozilla::RangedPtr<unsigned char> Base;
   public:
     UTF8CharsZ() : Base(nullptr, 0) {}
     UTF8CharsZ(char *aBytes, size_t aLength)
       : Base(reinterpret_cast<unsigned char *>(aBytes), aLength)
     {
         MOZ_ASSERT(aBytes[aLength] == '\0');
     }
     UTF8CharsZ(unsigned char *aBytes, size_t aLength)
       : Base(aBytes, aLength)
     {
         MOZ_ASSERT(aBytes[aLength] == '\0');
     }
     using Base::operator=;
     char *c_str() { return reinterpret_cast<char *>(get()); }
 };
 /*
  * SpiderMonkey uses a 2-byte character representation: it is a
  * 2-byte-at-a-time view of a UTF-16 byte stream. This is similar to UCS-2,
  * but unlike UCS-2, we do not strip UTF-16 extension bytes. This allows a
  * sufficiently dedicated JavaScript program to be fully unicode-aware by
  * manually interpreting UTF-16 extension characters embedded in the JS
  * string.
  */
 class TwoByteChars : public mozilla::Range<jschar>
 {
     typedef mozilla::Range<jschar> Base;
   public:
     TwoByteChars() : Base() {}
     TwoByteChars(jschar *aChars, size_t aLength) : Base(aChars, aLength) {}
     TwoByteChars(const jschar *aChars, size_t aLength) : Base(const_cast<jschar *>(aChars), aLength) {}
 };
 /*
  * A TwoByteChars, but \0 terminated for compatibility with JSFlatString.
  */
 class TwoByteCharsZ : public mozilla::RangedPtr<jschar>
 {
     typedef mozilla::RangedPtr<jschar> Base;
   public:
     TwoByteCharsZ() : Base(nullptr, 0) {}
     TwoByteCharsZ(jschar *chars, size_t length)
       : Base(chars, length)
     {
         MOZ_ASSERT(chars[length] == '\0');
     }
     using Base::operator=;
 };
 typedef mozilla::RangedPtr<const jschar> ConstCharPtr;
 /*
  * Like TwoByteChars, but the chars are const.
  */
 class ConstTwoByteChars : public mozilla::RangedPtr<const jschar>
 {
   public:
     ConstTwoByteChars(const ConstTwoByteChars &s) : ConstCharPtr(s) {}
     ConstTwoByteChars(const mozilla::RangedPtr<const jschar> &s) : ConstCharPtr(s) {}
     ConstTwoByteChars(const jschar *s, size_t len) : ConstCharPtr(s, len) {}
     ConstTwoByteChars(const jschar *pos, const jschar *start, size_t len)
       : ConstCharPtr(pos, start, len)
     {}
     using ConstCharPtr::operator=;
 };
 /*
  * Convert a 2-byte character sequence to "ISO-Latin-1". This works by
  * truncating each 2-byte pair in the sequence to a 1-byte pair. If the source
  * contains any UTF-16 extension characters, then this may give invalid Latin1
  * output. The returned string is zero terminated. The returned string or the
  * returned string's |start()| must be freed with JS_free or js_free,
  * respectively. If allocation fails, an OOM error will be set and the method
  * will return a nullptr chars (which can be tested for with the ! operator).
  * This method cannot trigger GC.
  */
 extern Latin1CharsZ
 LossyTwoByteCharsToNewLatin1CharsZ(js::ThreadSafeContext *cx, TwoByteChars tbchars);
 extern UTF8CharsZ
 TwoByteCharsToNewUTF8CharsZ(js::ThreadSafeContext *cx, TwoByteChars tbchars);
 uint32_t
 Utf8ToOneUcs4Char(const uint8_t *utf8Buffer, int utf8Length);
 /*
  * Inflate bytes in UTF-8 encoding to jschars.
  * - On error, returns an empty TwoByteCharsZ.
  * - On success, returns a malloc'd TwoByteCharsZ, and updates |outlen| to hold
  *   its length;  the length value excludes the trailing null.
  */
 extern TwoByteCharsZ
 UTF8CharsToNewTwoByteCharsZ(JSContext *cx, const UTF8Chars utf8, size_t *outlen);
 /*
  * The same as UTF8CharsToNewTwoByteCharsZ(), except that any malformed UTF-8 characters
  * will be replaced by \uFFFD. No exception will be thrown for malformed UTF-8
  * input.
  */
 extern TwoByteCharsZ
 LossyUTF8CharsToNewTwoByteCharsZ(JSContext *cx, const UTF8Chars utf8, size_t *outlen);
 } // namespace JS
 inline void JS_free(JS::Latin1CharsZ &ptr) { js_free((void*)ptr.get()); }
 inline void JS_free(JS::UTF8CharsZ &ptr) { js_free((void*)ptr.get()); }
 #endif /* js_CharacterEncoding_h */

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js/public/CharacterEncoding.h@97036ab72558 (annotated)

js/public/CharacterEncoding.h