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/*
* Copyright (C) 2003, 2006, 2008, 2009, 2010, 2012 Apple Inc. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_CSTRING_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_CSTRING_H_
#include <string.h>
#include "base/macros.h"
#include "base/memory/scoped_refptr.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
#include "third_party/blink/renderer/platform/wtf/allocator/partition_allocator.h"
#include "third_party/blink/renderer/platform/wtf/ref_counted.h"
#include "third_party/blink/renderer/platform/wtf/wtf_export.h"
namespace WTF {
// CStringImpl is an immutable ref-counted storage for the characters in a
// CString. It's analogous to a StringImpl but may contain any arbitrary
// sequence of bytes. The data is always allocated 1 longer than length() and is
// null terminated.
class WTF_EXPORT CStringImpl : public RefCounted<CStringImpl> {
public:
// CStringImpls are allocated out of the WTF buffer partition.
void* operator new(size_t, void* ptr) { return ptr; }
void operator delete(void*);
static scoped_refptr<CStringImpl> CreateUninitialized(size_t length,
char*& data);
const char* data() const { return reinterpret_cast<const char*>(this + 1); }
size_t length() const { return length_; }
private:
explicit CStringImpl(unsigned length) : length_(length) {}
const unsigned length_;
DISALLOW_COPY_AND_ASSIGN(CStringImpl);
};
// A container for an immutable ref-counted null-terminated char array. This is
// analogous to a WTF::String but does not require the contained bytes to be
// valid Latin1 or UTF-16. Instead a CString can contain any arbitrary bytes.
class WTF_EXPORT CString {
USING_FAST_MALLOC(CString);
public:
// Construct a null string, distinguishable from an empty string.
CString() = default;
// Construct a string from arbitrary bytes.
CString(const char* chars) : CString(chars, chars ? strlen(chars) : 0) {}
CString(const char*, size_t length);
// Construct a string referencing an existing buffer.
CString(CStringImpl* buffer) : buffer_(buffer) {}
CString(scoped_refptr<CStringImpl> buffer) : buffer_(std::move(buffer)) {}
static CString CreateUninitialized(size_t length, char*& data) {
return CStringImpl::CreateUninitialized(length, data);
}
// The bytes of the string, always NUL terminated. May be null.
const char* data() const { return buffer_ ? buffer_->data() : nullptr; }
// The length of the data(), *not* including the NUL terminator.
size_t length() const { return buffer_ ? buffer_->length() : 0; }
bool IsNull() const { return !buffer_; }
bool IsSafeToSendToAnotherThread() const;
CStringImpl* Impl() const { return buffer_.get(); }
private:
scoped_refptr<CStringImpl> buffer_;
};
WTF_EXPORT bool operator==(const CString& a, const CString& b);
inline bool operator!=(const CString& a, const CString& b) {
return !(a == b);
}
WTF_EXPORT bool operator==(const CString& a, const char* b);
inline bool operator!=(const CString& a, const char* b) {
return !(a == b);
}
// Pretty printer for gtest and base/logging.*. It prepends and appends
// double-quotes, and escapes characters other than ASCII printables.
WTF_EXPORT std::ostream& operator<<(std::ostream&, const CString&);
} // namespace WTF
using WTF::CString;
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_CSTRING_H_
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