mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-23 12:22:08 +00:00
299 lines
10 KiB
C++
299 lines
10 KiB
C++
// Tencent is pleased to support the open source community by making RapidJSON available.
|
|
//
|
|
// Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.
|
|
//
|
|
// Licensed under the MIT License (the "License"); you may not use this file except
|
|
// in compliance with the License. You may obtain a copy of the License at
|
|
//
|
|
// http://opensource.org/licenses/MIT
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software distributed
|
|
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
|
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
|
|
// specific language governing permissions and limitations under the License.
|
|
|
|
#ifndef RAPIDJSON_ENCODEDSTREAM_H_
|
|
#define RAPIDJSON_ENCODEDSTREAM_H_
|
|
|
|
#include "stream.h"
|
|
#include "memorystream.h"
|
|
|
|
#ifdef __GNUC__
|
|
RAPIDJSON_DIAG_PUSH
|
|
RAPIDJSON_DIAG_OFF(effc++)
|
|
#endif
|
|
|
|
#ifdef __clang__
|
|
RAPIDJSON_DIAG_PUSH
|
|
RAPIDJSON_DIAG_OFF(padded)
|
|
#endif
|
|
|
|
RAPIDJSON_NAMESPACE_BEGIN
|
|
|
|
//! Input byte stream wrapper with a statically bound encoding.
|
|
/*!
|
|
\tparam Encoding The interpretation of encoding of the stream. Either UTF8, UTF16LE, UTF16BE, UTF32LE, UTF32BE.
|
|
\tparam InputByteStream Type of input byte stream. For example, FileReadStream.
|
|
*/
|
|
template <typename Encoding, typename InputByteStream>
|
|
class EncodedInputStream {
|
|
RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
|
|
public:
|
|
typedef typename Encoding::Ch Ch;
|
|
|
|
EncodedInputStream(InputByteStream& is) : is_(is) {
|
|
current_ = Encoding::TakeBOM(is_);
|
|
}
|
|
|
|
Ch Peek() const { return current_; }
|
|
Ch Take() { Ch c = current_; current_ = Encoding::Take(is_); return c; }
|
|
size_t Tell() const { return is_.Tell(); }
|
|
|
|
// Not implemented
|
|
void Put(Ch) { RAPIDJSON_ASSERT(false); }
|
|
void Flush() { RAPIDJSON_ASSERT(false); }
|
|
Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
|
|
size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
|
|
|
|
private:
|
|
EncodedInputStream(const EncodedInputStream&);
|
|
EncodedInputStream& operator=(const EncodedInputStream&);
|
|
|
|
InputByteStream& is_;
|
|
Ch current_;
|
|
};
|
|
|
|
//! Specialized for UTF8 MemoryStream.
|
|
template <>
|
|
class EncodedInputStream<UTF8<>, MemoryStream> {
|
|
public:
|
|
typedef UTF8<>::Ch Ch;
|
|
|
|
EncodedInputStream(MemoryStream& is) : is_(is) {
|
|
if (static_cast<unsigned char>(is_.Peek()) == 0xEFu) is_.Take();
|
|
if (static_cast<unsigned char>(is_.Peek()) == 0xBBu) is_.Take();
|
|
if (static_cast<unsigned char>(is_.Peek()) == 0xBFu) is_.Take();
|
|
}
|
|
Ch Peek() const { return is_.Peek(); }
|
|
Ch Take() { return is_.Take(); }
|
|
size_t Tell() const { return is_.Tell(); }
|
|
|
|
// Not implemented
|
|
void Put(Ch) {}
|
|
void Flush() {}
|
|
Ch* PutBegin() { return 0; }
|
|
size_t PutEnd(Ch*) { return 0; }
|
|
|
|
MemoryStream& is_;
|
|
|
|
private:
|
|
EncodedInputStream(const EncodedInputStream&);
|
|
EncodedInputStream& operator=(const EncodedInputStream&);
|
|
};
|
|
|
|
//! Output byte stream wrapper with statically bound encoding.
|
|
/*!
|
|
\tparam Encoding The interpretation of encoding of the stream. Either UTF8, UTF16LE, UTF16BE, UTF32LE, UTF32BE.
|
|
\tparam OutputByteStream Type of input byte stream. For example, FileWriteStream.
|
|
*/
|
|
template <typename Encoding, typename OutputByteStream>
|
|
class EncodedOutputStream {
|
|
RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
|
|
public:
|
|
typedef typename Encoding::Ch Ch;
|
|
|
|
EncodedOutputStream(OutputByteStream& os, bool putBOM = true) : os_(os) {
|
|
if (putBOM)
|
|
Encoding::PutBOM(os_);
|
|
}
|
|
|
|
void Put(Ch c) { Encoding::Put(os_, c); }
|
|
void Flush() { os_.Flush(); }
|
|
|
|
// Not implemented
|
|
Ch Peek() const { RAPIDJSON_ASSERT(false); return 0;}
|
|
Ch Take() { RAPIDJSON_ASSERT(false); return 0;}
|
|
size_t Tell() const { RAPIDJSON_ASSERT(false); return 0; }
|
|
Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
|
|
size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
|
|
|
|
private:
|
|
EncodedOutputStream(const EncodedOutputStream&);
|
|
EncodedOutputStream& operator=(const EncodedOutputStream&);
|
|
|
|
OutputByteStream& os_;
|
|
};
|
|
|
|
#define RAPIDJSON_ENCODINGS_FUNC(x) UTF8<Ch>::x, UTF16LE<Ch>::x, UTF16BE<Ch>::x, UTF32LE<Ch>::x, UTF32BE<Ch>::x
|
|
|
|
//! Input stream wrapper with dynamically bound encoding and automatic encoding detection.
|
|
/*!
|
|
\tparam CharType Type of character for reading.
|
|
\tparam InputByteStream type of input byte stream to be wrapped.
|
|
*/
|
|
template <typename CharType, typename InputByteStream>
|
|
class AutoUTFInputStream {
|
|
RAPIDJSON_STATIC_ASSERT(sizeof(typename InputByteStream::Ch) == 1);
|
|
public:
|
|
typedef CharType Ch;
|
|
|
|
//! Constructor.
|
|
/*!
|
|
\param is input stream to be wrapped.
|
|
\param type UTF encoding type if it is not detected from the stream.
|
|
*/
|
|
AutoUTFInputStream(InputByteStream& is, UTFType type = kUTF8) : is_(&is), type_(type), hasBOM_(false) {
|
|
RAPIDJSON_ASSERT(type >= kUTF8 && type <= kUTF32BE);
|
|
DetectType();
|
|
static const TakeFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(Take) };
|
|
takeFunc_ = f[type_];
|
|
current_ = takeFunc_(*is_);
|
|
}
|
|
|
|
UTFType GetType() const { return type_; }
|
|
bool HasBOM() const { return hasBOM_; }
|
|
|
|
Ch Peek() const { return current_; }
|
|
Ch Take() { Ch c = current_; current_ = takeFunc_(*is_); return c; }
|
|
size_t Tell() const { return is_->Tell(); }
|
|
|
|
// Not implemented
|
|
void Put(Ch) { RAPIDJSON_ASSERT(false); }
|
|
void Flush() { RAPIDJSON_ASSERT(false); }
|
|
Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
|
|
size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
|
|
|
|
private:
|
|
AutoUTFInputStream(const AutoUTFInputStream&);
|
|
AutoUTFInputStream& operator=(const AutoUTFInputStream&);
|
|
|
|
// Detect encoding type with BOM or RFC 4627
|
|
void DetectType() {
|
|
// BOM (Byte Order Mark):
|
|
// 00 00 FE FF UTF-32BE
|
|
// FF FE 00 00 UTF-32LE
|
|
// FE FF UTF-16BE
|
|
// FF FE UTF-16LE
|
|
// EF BB BF UTF-8
|
|
|
|
const unsigned char* c = reinterpret_cast<const unsigned char *>(is_->Peek4());
|
|
if (!c)
|
|
return;
|
|
|
|
unsigned bom = static_cast<unsigned>(c[0] | (c[1] << 8) | (c[2] << 16) | (c[3] << 24));
|
|
hasBOM_ = false;
|
|
if (bom == 0xFFFE0000) { type_ = kUTF32BE; hasBOM_ = true; is_->Take(); is_->Take(); is_->Take(); is_->Take(); }
|
|
else if (bom == 0x0000FEFF) { type_ = kUTF32LE; hasBOM_ = true; is_->Take(); is_->Take(); is_->Take(); is_->Take(); }
|
|
else if ((bom & 0xFFFF) == 0xFFFE) { type_ = kUTF16BE; hasBOM_ = true; is_->Take(); is_->Take(); }
|
|
else if ((bom & 0xFFFF) == 0xFEFF) { type_ = kUTF16LE; hasBOM_ = true; is_->Take(); is_->Take(); }
|
|
else if ((bom & 0xFFFFFF) == 0xBFBBEF) { type_ = kUTF8; hasBOM_ = true; is_->Take(); is_->Take(); is_->Take(); }
|
|
|
|
// RFC 4627: Section 3
|
|
// "Since the first two characters of a JSON text will always be ASCII
|
|
// characters [RFC0020], it is possible to determine whether an octet
|
|
// stream is UTF-8, UTF-16 (BE or LE), or UTF-32 (BE or LE) by looking
|
|
// at the pattern of nulls in the first four octets."
|
|
// 00 00 00 xx UTF-32BE
|
|
// 00 xx 00 xx UTF-16BE
|
|
// xx 00 00 00 UTF-32LE
|
|
// xx 00 xx 00 UTF-16LE
|
|
// xx xx xx xx UTF-8
|
|
|
|
if (!hasBOM_) {
|
|
int pattern = (c[0] ? 1 : 0) | (c[1] ? 2 : 0) | (c[2] ? 4 : 0) | (c[3] ? 8 : 0);
|
|
switch (pattern) {
|
|
case 0x08: type_ = kUTF32BE; break;
|
|
case 0x0A: type_ = kUTF16BE; break;
|
|
case 0x01: type_ = kUTF32LE; break;
|
|
case 0x05: type_ = kUTF16LE; break;
|
|
case 0x0F: type_ = kUTF8; break;
|
|
default: break; // Use type defined by user.
|
|
}
|
|
}
|
|
|
|
// Runtime check whether the size of character type is sufficient. It only perform checks with assertion.
|
|
if (type_ == kUTF16LE || type_ == kUTF16BE) RAPIDJSON_ASSERT(sizeof(Ch) >= 2);
|
|
if (type_ == kUTF32LE || type_ == kUTF32BE) RAPIDJSON_ASSERT(sizeof(Ch) >= 4);
|
|
}
|
|
|
|
typedef Ch (*TakeFunc)(InputByteStream& is);
|
|
InputByteStream* is_;
|
|
UTFType type_;
|
|
Ch current_;
|
|
TakeFunc takeFunc_;
|
|
bool hasBOM_;
|
|
};
|
|
|
|
//! Output stream wrapper with dynamically bound encoding and automatic encoding detection.
|
|
/*!
|
|
\tparam CharType Type of character for writing.
|
|
\tparam OutputByteStream type of output byte stream to be wrapped.
|
|
*/
|
|
template <typename CharType, typename OutputByteStream>
|
|
class AutoUTFOutputStream {
|
|
RAPIDJSON_STATIC_ASSERT(sizeof(typename OutputByteStream::Ch) == 1);
|
|
public:
|
|
typedef CharType Ch;
|
|
|
|
//! Constructor.
|
|
/*!
|
|
\param os output stream to be wrapped.
|
|
\param type UTF encoding type.
|
|
\param putBOM Whether to write BOM at the beginning of the stream.
|
|
*/
|
|
AutoUTFOutputStream(OutputByteStream& os, UTFType type, bool putBOM) : os_(&os), type_(type) {
|
|
RAPIDJSON_ASSERT(type >= kUTF8 && type <= kUTF32BE);
|
|
|
|
// Runtime check whether the size of character type is sufficient. It only perform checks with assertion.
|
|
if (type_ == kUTF16LE || type_ == kUTF16BE) RAPIDJSON_ASSERT(sizeof(Ch) >= 2);
|
|
if (type_ == kUTF32LE || type_ == kUTF32BE) RAPIDJSON_ASSERT(sizeof(Ch) >= 4);
|
|
|
|
static const PutFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(Put) };
|
|
putFunc_ = f[type_];
|
|
|
|
if (putBOM)
|
|
PutBOM();
|
|
}
|
|
|
|
UTFType GetType() const { return type_; }
|
|
|
|
void Put(Ch c) { putFunc_(*os_, c); }
|
|
void Flush() { os_->Flush(); }
|
|
|
|
// Not implemented
|
|
Ch Peek() const { RAPIDJSON_ASSERT(false); return 0;}
|
|
Ch Take() { RAPIDJSON_ASSERT(false); return 0;}
|
|
size_t Tell() const { RAPIDJSON_ASSERT(false); return 0; }
|
|
Ch* PutBegin() { RAPIDJSON_ASSERT(false); return 0; }
|
|
size_t PutEnd(Ch*) { RAPIDJSON_ASSERT(false); return 0; }
|
|
|
|
private:
|
|
AutoUTFOutputStream(const AutoUTFOutputStream&);
|
|
AutoUTFOutputStream& operator=(const AutoUTFOutputStream&);
|
|
|
|
void PutBOM() {
|
|
typedef void (*PutBOMFunc)(OutputByteStream&);
|
|
static const PutBOMFunc f[] = { RAPIDJSON_ENCODINGS_FUNC(PutBOM) };
|
|
f[type_](*os_);
|
|
}
|
|
|
|
typedef void (*PutFunc)(OutputByteStream&, Ch);
|
|
|
|
OutputByteStream* os_;
|
|
UTFType type_;
|
|
PutFunc putFunc_;
|
|
};
|
|
|
|
#undef RAPIDJSON_ENCODINGS_FUNC
|
|
|
|
RAPIDJSON_NAMESPACE_END
|
|
|
|
#ifdef __clang__
|
|
RAPIDJSON_DIAG_POP
|
|
#endif
|
|
|
|
#ifdef __GNUC__
|
|
RAPIDJSON_DIAG_POP
|
|
#endif
|
|
|
|
#endif // RAPIDJSON_FILESTREAM_H_
|