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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// This file contains the definition of class FileTextReader. The
// tests are in string_reader_test.cc.
#include "utils/cross/file_text_reader.h"
#include <stdio.h>
#include <sys/stat.h>
#include "base/logging.h"
#include "base/scoped_ptr.h"
namespace o3d {
FileTextReader::FileTextReader(FILE* input)
: TextReader(), input_(input) {
if (input_ == NULL) {
LOG(FATAL) << "Invalid NULL file pointer";
}
if (::ferror(input_) != 0) {
DLOG(FATAL) << "Invalid file pointer.";
}
}
FileTextReader::~FileTextReader() {
}
size_t FileTextReader::position() const {
if (input_) {
return ::ftell(input_);
} else {
return 0;
}
}
bool FileTextReader::IsAtEnd() const {
size_t position = ::ftell(input_);
if (::feof(input_) != 0) {
return true;
}
return GetFileSize() == position;
}
std::string FileTextReader::PeekString(std::string::size_type count) const {
if (IsAtEnd()) {
return std::string("");
}
// Find out where we are in the stream.
size_t original_pos = ::ftell(input_);
// We're just re-using code here -- the stream will not be affected
// because we will seek back to where we started.
std::string result = const_cast<FileTextReader*>(this)->ReadString(count);
// Go back to where we started in the stream.
::fseek(input_, original_pos, SEEK_SET);
return result;
}
char FileTextReader::ReadChar() {
if (!IsAtEnd()) {
return ::fgetc(input_);
} else {
return 0;
}
}
std::string FileTextReader::ReadString(std::string::size_type count) {
if (count <= 0 || IsAtEnd()) {
return std::string("");
}
// Allocate a string to hold the data.
scoped_array<char> buffer(new char[count + 1]);
// Read it.
size_t count_read = ::fread(reinterpret_cast<void*>(buffer.get()),
sizeof(char),
count,
input_);
// Make sure it's null terminated.
(buffer.get())[count_read] = 0;
return std::string(buffer.get());
}
std::string FileTextReader::ReadLine() {
// Find out where we are in the stream.
int original_pos = ::ftell(input_);
// Find the occurance of the next eol character, regardless of what
// kind of terminator it is.
static const char linefeed = '\n';
static const char carriage_return = '\r';
int eol_pos = -1;
int eol_len = 1;
while (!IsAtEnd()) {
char eol = ::fgetc(input_);
if (eol == linefeed) {
eol_pos = ::ftell(input_);
break;
}
if (eol == carriage_return) {
eol_pos = ::ftell(input_);
if (IsAtEnd()) {
break;
}
eol = ::fgetc(input_);
if (eol == linefeed) {
eol_len = 2;
}
break;
}
}
// Go back to where we started in the stream.
::fseek(input_, original_pos, SEEK_SET);
if (eol_pos > 0) {
int count = eol_pos - original_pos - 1;
std::string result = ReadString(count);
// Strip off one EOL marker (of the appropriate length).
ReadString(eol_len);
return result;
} else {
// If there are no end of line markers in this file, just send
// back the whole file.
return ReadToEnd();
}
}
std::string FileTextReader::ReadToEnd() {
size_t remaining_size = GetRemainingSize();
if (remaining_size > 0) {
return ReadString(remaining_size);
} else {
return std::string("");
}
}
size_t FileTextReader::GetFileSize() const {
struct stat file_info;
::fstat(::fileno(input_), &file_info);
return file_info.st_size;
}
size_t FileTextReader::GetRemainingSize() const {
// Find out where we are in the stream.
int original_pos = ::ftell(input_);
return GetFileSize() - original_pos;
}
} // end namespace o3d
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