100 lines
2.9 KiB
C
100 lines
2.9 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. All rights reserved.
|
||
|
|
//
|
||
|
|
// 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_FILEREADSTREAM_H_
|
||
|
|
#define RAPIDJSON_FILEREADSTREAM_H_
|
||
|
|
|
||
|
|
#include "stream.h"
|
||
|
|
#include <cstdio>
|
||
|
|
|
||
|
|
#ifdef __clang__
|
||
|
|
RAPIDJSON_DIAG_PUSH
|
||
|
|
RAPIDJSON_DIAG_OFF(padded)
|
||
|
|
RAPIDJSON_DIAG_OFF(unreachable-code)
|
||
|
|
RAPIDJSON_DIAG_OFF(missing-noreturn)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
RAPIDJSON_NAMESPACE_BEGIN
|
||
|
|
|
||
|
|
//! File byte stream for input using fread().
|
||
|
|
/*!
|
||
|
|
\note implements Stream concept
|
||
|
|
*/
|
||
|
|
class FileReadStream {
|
||
|
|
public:
|
||
|
|
typedef char Ch; //!< Character type (byte).
|
||
|
|
|
||
|
|
//! Constructor.
|
||
|
|
/*!
|
||
|
|
\param fp File pointer opened for read.
|
||
|
|
\param buffer user-supplied buffer.
|
||
|
|
\param bufferSize size of buffer in bytes. Must >=4 bytes.
|
||
|
|
*/
|
||
|
|
FileReadStream(std::FILE* fp, char* buffer, size_t bufferSize) : fp_(fp), buffer_(buffer), bufferSize_(bufferSize), bufferLast_(0), current_(buffer_), readCount_(0), count_(0), eof_(false) {
|
||
|
|
RAPIDJSON_ASSERT(fp_ != 0);
|
||
|
|
RAPIDJSON_ASSERT(bufferSize >= 4);
|
||
|
|
Read();
|
||
|
|
}
|
||
|
|
|
||
|
|
Ch Peek() const { return *current_; }
|
||
|
|
Ch Take() { Ch c = *current_; Read(); return c; }
|
||
|
|
size_t Tell() const { return count_ + static_cast<size_t>(current_ - buffer_); }
|
||
|
|
|
||
|
|
// 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; }
|
||
|
|
|
||
|
|
// For encoding detection only.
|
||
|
|
const Ch* Peek4() const {
|
||
|
|
return (current_ + 4 <= bufferLast_) ? current_ : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
void Read() {
|
||
|
|
if (current_ < bufferLast_)
|
||
|
|
++current_;
|
||
|
|
else if (!eof_) {
|
||
|
|
count_ += readCount_;
|
||
|
|
readCount_ = fread(buffer_, 1, bufferSize_, fp_);
|
||
|
|
bufferLast_ = buffer_ + readCount_ - 1;
|
||
|
|
current_ = buffer_;
|
||
|
|
|
||
|
|
if (readCount_ < bufferSize_) {
|
||
|
|
buffer_[readCount_] = '\0';
|
||
|
|
++bufferLast_;
|
||
|
|
eof_ = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
std::FILE* fp_;
|
||
|
|
Ch *buffer_;
|
||
|
|
size_t bufferSize_;
|
||
|
|
Ch *bufferLast_;
|
||
|
|
Ch *current_;
|
||
|
|
size_t readCount_;
|
||
|
|
size_t count_; //!< Number of characters read
|
||
|
|
bool eof_;
|
||
|
|
};
|
||
|
|
|
||
|
|
RAPIDJSON_NAMESPACE_END
|
||
|
|
|
||
|
|
#ifdef __clang__
|
||
|
|
RAPIDJSON_DIAG_POP
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif // RAPIDJSON_FILESTREAM_H_
|