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#include <stdio.h>
#ifdef _WIN32
#include <io.h>
#else // _WIN32
#include <unistd.h>
#endif // _WIN32
#include <limits>
#include "reader.h"
namespace marisa {
namespace grimoire {
namespace io {
Reader::Reader()
: file_(NULL), fd_(-1), stream_(NULL), needs_fclose_(false) {}
Reader::~Reader() {
if (needs_fclose_) {
::fclose(file_);
}
}
void Reader::open(const char *filename) {
MARISA_THROW_IF(filename == NULL, MARISA_NULL_ERROR);
Reader temp;
temp.open_(filename);
swap(temp);
}
void Reader::open(std::FILE *file) {
MARISA_THROW_IF(file == NULL, MARISA_NULL_ERROR);
Reader temp;
temp.open_(file);
swap(temp);
}
void Reader::open(int fd) {
MARISA_THROW_IF(fd == -1, MARISA_CODE_ERROR);
Reader temp;
temp.open_(fd);
swap(temp);
}
void Reader::open(std::istream &stream) {
Reader temp;
temp.open_(stream);
swap(temp);
}
void Reader::clear() {
Reader().swap(*this);
}
void Reader::swap(Reader &rhs) {
marisa::swap(file_, rhs.file_);
marisa::swap(fd_, rhs.fd_);
marisa::swap(stream_, rhs.stream_);
marisa::swap(needs_fclose_, rhs.needs_fclose_);
}
void Reader::seek(std::size_t size) {
MARISA_THROW_IF(!is_open(), MARISA_STATE_ERROR);
if (size == 0) {
return;
} else if (size <= 16) {
char buf[16];
read_data(buf, size);
} else {
char buf[1024];
while (size != 0) {
const std::size_t count = (size < sizeof(buf)) ? size : sizeof(buf);
read_data(buf, count);
size -= count;
}
}
}
bool Reader::is_open() const {
return (file_ != NULL) || (fd_ != -1) || (stream_ != NULL);
}
void Reader::open_(const char *filename) {
std::FILE *file = NULL;
#ifdef _MSC_VER
MARISA_THROW_IF(::fopen_s(&file, filename, "rb") != 0, MARISA_IO_ERROR);
#else // _MSC_VER
file = ::fopen(filename, "rb");
MARISA_THROW_IF(file == NULL, MARISA_IO_ERROR);
#endif // _MSC_VER
file_ = file;
needs_fclose_ = true;
}
void Reader::open_(std::FILE *file) {
file_ = file;
}
void Reader::open_(int fd) {
fd_ = fd;
}
void Reader::open_(std::istream &stream) {
stream_ = &stream;
}
void Reader::read_data(void *buf, std::size_t size) {
MARISA_THROW_IF(!is_open(), MARISA_STATE_ERROR);
if (size == 0) {
return;
} else if (fd_ != -1) {
while (size != 0) {
#ifdef _WIN32
static const std::size_t CHUNK_SIZE =
std::numeric_limits<int>::max();
const unsigned int count = (size < CHUNK_SIZE) ? size : CHUNK_SIZE;
const int size_read = ::_read(fd_, buf, count);
#else // _WIN32
static const std::size_t CHUNK_SIZE =
std::numeric_limits< ::ssize_t>::max();
const ::size_t count = (size < CHUNK_SIZE) ? size : CHUNK_SIZE;
const ::ssize_t size_read = ::read(fd_, buf, count);
#endif // _WIN32
MARISA_THROW_IF(size_read <= 0, MARISA_IO_ERROR);
buf = static_cast<char *>(buf) + size_read;
size -= size_read;
}
} else if (file_ != NULL) {
MARISA_THROW_IF(::fread(buf, 1, size, file_) != size, MARISA_IO_ERROR);
} else if (stream_ != NULL) {
try {
MARISA_THROW_IF(!stream_->read(static_cast<char *>(buf), size),
MARISA_IO_ERROR);
} catch (const std::ios_base::failure &) {
MARISA_THROW(MARISA_IO_ERROR, "std::ios_base::failure");
}
}
}
} // namespace io
} // namespace grimoire
} // namespace marisa
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