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127 lines
3.7 KiB
C++
127 lines
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=78:
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef js_CharacterEncoding_h___
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#define js_CharacterEncoding_h___
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#include "mozilla/Range.h"
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#include "js/Utility.h"
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#include "jspubtd.h"
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namespace JS {
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/*
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* By default, all C/C++ 1-byte-per-character strings passed into the JSAPI
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* are treated as ISO/IEC 8859-1, also known as Latin-1. That is, each
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* byte is treated as a 2-byte character, and there is no way to pass in a
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* string containing characters beyond U+00FF.
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*/
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class Latin1Chars : public mozilla::Range<unsigned char>
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{
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typedef mozilla::Range<unsigned char> Base;
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public:
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Latin1Chars() : Base() {}
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Latin1Chars(char *bytes, size_t length) : Base(reinterpret_cast<unsigned char *>(bytes), length) {}
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};
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/*
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* A Latin1Chars, but with \0 termination for C compatibility.
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*/
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class Latin1CharsZ : public mozilla::RangedPtr<unsigned char>
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{
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typedef mozilla::RangedPtr<unsigned char> Base;
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public:
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Latin1CharsZ() : Base(NULL, 0) {}
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Latin1CharsZ(char *bytes, size_t length)
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: Base(reinterpret_cast<unsigned char *>(bytes), length)
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{
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JS_ASSERT(bytes[length] == '\0');
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}
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Latin1CharsZ(unsigned char *bytes, size_t length)
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: Base(bytes, length)
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{
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JS_ASSERT(bytes[length] == '\0');
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}
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char *c_str() { return reinterpret_cast<char *>(get()); }
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};
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/*
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* SpiderMonkey also deals directly with UTF-8 encoded text in some places.
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*/
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class UTF8CharsZ : public mozilla::RangedPtr<unsigned char>
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{
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typedef mozilla::RangedPtr<unsigned char> Base;
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public:
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UTF8CharsZ() : Base(NULL, 0) {}
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UTF8CharsZ(char *bytes, size_t length)
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: Base(reinterpret_cast<unsigned char *>(bytes), length)
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{
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JS_ASSERT(bytes[length] == '\0');
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}
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};
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/*
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* SpiderMonkey uses a 2-byte character representation: it is a
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* 2-byte-at-a-time view of a UTF-16 byte stream. This is similar to UCS-2,
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* but unlike UCS-2, we do not strip UTF-16 extension bytes. This allows a
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* sufficiently dedicated JavaScript program to be fully unicode-aware by
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* manually interpreting UTF-16 extension characters embedded in the JS
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* string.
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*/
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class TwoByteChars : public mozilla::Range<jschar>
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{
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typedef mozilla::Range<jschar> Base;
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public:
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TwoByteChars() : Base() {}
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TwoByteChars(jschar *chars, size_t length) : Base(chars, length) {}
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TwoByteChars(const jschar *chars, size_t length) : Base(const_cast<jschar *>(chars), length) {}
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};
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/*
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* A TwoByteChars, but \0 terminated for compatibility with JSFlatString.
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*/
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class TwoByteCharsZ : public mozilla::RangedPtr<jschar>
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{
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typedef mozilla::RangedPtr<jschar> Base;
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public:
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TwoByteCharsZ(jschar *chars, size_t length)
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: Base(chars, length)
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{
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JS_ASSERT(chars[length] = '\0');
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}
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};
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/*
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* Convert a 2-byte character sequence to "ISO-Latin-1". This works by
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* truncating each 2-byte pair in the sequence to a 1-byte pair. If the source
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* contains any UTF-16 extension characters, then this may give invalid Latin1
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* output. The returned string is zero terminated. The returned string or the
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* returned string's |start()| must be freed with JS_free or js_free,
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* respectively. If allocation fails, an OOM error will be set and the method
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* will return a NULL chars (which can be tested for with the ! operator).
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* This method cannot trigger GC.
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*/
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extern Latin1CharsZ
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LossyTwoByteCharsToNewLatin1CharsZ(JSContext *cx, TwoByteChars tbchars);
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} // namespace JS
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inline void JS_free(JS::Latin1CharsZ &ptr) { js_free((void*)ptr.get()); }
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#endif // js_CharacterEncoding_h___
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