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/**********************************************************************
* File: fileio.cpp
* Description: File I/O utilities.
* Author: Samuel Charron
* Created: Tuesday, July 9, 2013
*
* (C) Copyright 2013, Google Inc.
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at http://www.apache.org/licenses/LICENSE-2.0 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.
*
**********************************************************************/
#ifdef _WIN32
#include <windows.h>
#ifndef unlink
#include <io.h>
#endif
#else
#include <glob.h>
#include <unistd.h>
#endif
#include <stdlib.h>
#include <cstdio>
#include <string>
#include "fileio.h"
#include "tprintf.h"
namespace tesseract {
///////////////////////////////////////////////////////////////////////////////
// File::
///////////////////////////////////////////////////////////////////////////////
FILE* File::Open(const string& filename, const string& mode) {
return fopen(filename.c_str(), mode.c_str());
}
FILE* File::OpenOrDie(const string& filename,
const string& mode) {
FILE* stream = fopen(filename.c_str(), mode.c_str());
if (stream == NULL) {
tprintf("Unable to open '%s' in mode '%s'\n", filename.c_str(),
mode.c_str());
}
return stream;
}
void File::WriteStringToFileOrDie(const string& str,
const string& filename) {
FILE* stream = fopen(filename.c_str(), "wb");
if (stream == NULL) {
tprintf("Unable to open '%s' for writing\n", filename.c_str());
return;
}
fputs(str.c_str(), stream);
ASSERT_HOST(fclose(stream) == 0);
}
bool File::Readable(const string& filename) {
FILE* stream = fopen(filename.c_str(), "rb");
if (stream == NULL) {
return false;
}
fclose(stream);
return true;
}
bool File::ReadFileToString(const string& filename, string* out) {
FILE* stream = File::Open(filename.c_str(), "rb");
if (stream == NULL)
return false;
InputBuffer in(stream);
*out = "";
string temp;
while (in.ReadLine(&temp)) {
*out += temp;
*out += '\n';
}
return in.CloseFile();
}
void File::ReadFileToStringOrDie(const string& filename, string* out) {
ASSERT_HOST_MSG(ReadFileToString(filename, out),
"Failed to read file: %s\n", filename.c_str());
}
string File::JoinPath(const string& prefix, const string& suffix) {
return (!prefix.size() || prefix[prefix.size() - 1] == '/') ?
prefix + suffix : prefix + "/" + suffix;
}
bool File::Delete(const char* pathname) {
const int status = unlink(pathname);
if (status != 0) {
tprintf("ERROR: Unable to delete file %s\n", pathname);
return false;
}
return true;
}
#ifdef _WIN32
bool File::DeleteMatchingFiles(const char* pattern) {
WIN32_FIND_DATA data;
BOOL result = TRUE;
HANDLE handle = FindFirstFile(pattern, &data);
bool all_deleted = true;
if (handle != INVALID_HANDLE_VALUE) {
for (; result; result = FindNextFile(handle, &data)) {
all_deleted &= File::Delete(data.cFileName);
}
FindClose(handle);
}
return all_deleted;
}
#else
bool File::DeleteMatchingFiles(const char* pattern) {
glob_t pglob;
char **paths;
bool all_deleted = true;
if (glob(pattern, 0, NULL, &pglob) == 0) {
for (paths = pglob.gl_pathv; *paths != NULL; paths++) {
all_deleted &= File::Delete(*paths);
}
globfree(&pglob);
}
return all_deleted;
}
#endif
///////////////////////////////////////////////////////////////////////////////
// InputBuffer::
///////////////////////////////////////////////////////////////////////////////
InputBuffer::InputBuffer(FILE* stream)
: stream_(stream) {
fseek(stream_, 0, SEEK_END);
filesize_ = ftell(stream_);
fseek(stream_, 0, SEEK_SET);
}
InputBuffer::InputBuffer(FILE* stream, size_t)
: stream_(stream) {
fseek(stream_, 0, SEEK_END);
filesize_ = ftell(stream_);
fseek(stream_, 0, SEEK_SET);
}
InputBuffer::~InputBuffer() {
if (stream_ != NULL) {
fclose(stream_);
}
}
bool InputBuffer::ReadLine(string* out) {
ASSERT_HOST(stream_ != NULL);
char* line = NULL;
int len = -1;
#ifndef HAVE_GETLINE
char line_buf[BUFSIZ];
if ((line = fgets(line_buf, BUFSIZ, stream_)) != NULL) {
len = strlen(line);
if (line_buf[0] != '\0' && line_buf[len - 1] == '\n')
line_buf[len - 1] = '\0';
} else {
return false;
}
*out = string(line);
#else
size_t line_size;
len = getline(&line, &line_size, stream_);
if (len < 0) {
return false;
}
if (len >= 1 && line[len - 1] == '\n')
line[len - 1] = '\0';
*out = string(line);
free(line);
#endif // HAVE_GETLINE
return true;
}
bool InputBuffer::CloseFile() {
int ret = fclose(stream_);
stream_ = NULL;
return ret == 0;
}
///////////////////////////////////////////////////////////////////////////////
// OutputBuffer::
///////////////////////////////////////////////////////////////////////////////
OutputBuffer::OutputBuffer(FILE* stream)
: stream_(stream) {
}
OutputBuffer::OutputBuffer(FILE* stream, size_t)
: stream_(stream) {
}
OutputBuffer::~OutputBuffer() {
if (stream_ != NULL) {
fclose(stream_);
}
}
void OutputBuffer::WriteString(const string& str) {
fputs(str.c_str(), stream_);
}
bool OutputBuffer::CloseFile() {
int ret = fclose(stream_);
stream_ = NULL;
return ret == 0;
}
} // namespace tesseract
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