59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
#ifndef RABIT_LEARN_IO_BUFFER_READER_INL_H_
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#define RABIT_LEARN_IO_BUFFER_READER_INL_H_
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/*!
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* \file buffer_reader-inl.h
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* \brief implementation of stream buffer reader
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* \author Tianqi Chen
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*/
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#include "./io.h"
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namespace rabit {
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namespace io {
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/*! \brief buffer reader of the stream that allows you to get */
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class StreamBufferReader {
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public:
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StreamBufferReader(size_t buffer_size)
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:stream_(NULL),
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read_len_(1), read_ptr_(1) {
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buffer_.resize(buffer_size);
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}
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/*!
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* \brief set input stream
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*/
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inline void set_stream(IStream *stream) {
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stream_ = stream;
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read_len_ = read_ptr_ = 1;
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}
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/*!
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* \brief allows quick read using get char
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*/
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inline char GetChar(void) {
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while (true) {
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if (read_ptr_ < read_len_) {
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return buffer_[read_ptr_++];
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} else {
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read_len_ = stream_->Read(&buffer_[0], buffer_.length());
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if (read_len_ == 0) return EOF;
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read_ptr_ = 0;
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}
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}
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}
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/*! \brief whether we are reaching the end of file */
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inline bool AtEnd(void) const {
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return read_len_ == 0;
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}
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private:
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/*! \brief the underlying stream */
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IStream *stream_;
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/*! \brief buffer to hold data */
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std::string buffer_;
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/*! \brief length of valid data in buffer */
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size_t read_len_;
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/*! \brief pointer in the buffer */
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size_t read_ptr_;
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};
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} // namespace io
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} // namespace rabit
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#endif // RABIT_LEARN_IO_BUFFER_READER_INL_H_
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