mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-08-16 15:00:33 +03:00
88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
#include "GzFileBuf.h"
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#include <cstring>
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#include <cstdlib>
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#include <cstdio>
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#include <iostream>
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GzFileBuf::GzFileBuf(const char* filename)
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{
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m_gz_file = gzopen(filename, "rb");
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if (m_gz_file == NULL) {
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std::cerr << "ERROR: Failed to open " << filename << std::endl;
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std::exit(1);
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}
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setg(m_buf + sizeof(int), // beginning of putback area
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m_buf + sizeof(int), // read position
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m_buf + sizeof(int)); // end position
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}
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GzFileBuf::~GzFileBuf()
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{
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gzclose(m_gz_file);
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}
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int GzFileBuf::overflow(int_type c)
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{
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throw;
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}
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// read one character
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int GzFileBuf::underflow()
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{
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// is read position before end of m_buf?
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if (gptr() < egptr()) {
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return traits_type::to_int_type(*gptr());
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}
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/* process size of putback area
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* - use number of characters read
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* - but at most four
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*/
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unsigned int num_put_back = static_cast<unsigned int>(gptr() - eback());
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if (num_put_back > sizeof(int)) {
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num_put_back = sizeof(int);
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}
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/* copy up to four characters previously read into
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* the putback m_buf (area of first four characters)
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*/
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std::memmove(m_buf + (sizeof(int) - num_put_back),
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gptr() - num_put_back, num_put_back);
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// read new characters
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const int num = gzread(m_gz_file, m_buf + sizeof(int),
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kBufSize - sizeof(int));
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if (num <= 0) {
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// ERROR or EOF
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return EOF; // NOTE: the macro EOF defined in stdio.h
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}
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// reset m_buf pointers
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setg(m_buf + (sizeof(int) - num_put_back), // beginning of putback area
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m_buf + sizeof(int), // read position
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m_buf + sizeof(int) + num); // end of buffer
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// return next character
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return traits_type::to_int_type(*gptr());
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}
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std::streampos GzFileBuf::seekpos(
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std::streampos sp,
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std::ios_base::openmode which)
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{
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throw;
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}
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std::streamsize GzFileBuf::xsgetn(char* s,
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std::streamsize num)
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{
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return static_cast<std::streamsize>(gzread(m_gz_file,s,num));
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}
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std::streamsize GzFileBuf::xsputn(const char* s,
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std::streamsize num)
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{
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throw;
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}
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