3 * This source code is part of
7 * GROningen MAchine for Chemical Simulations
9 * Written by David van der Spoel, Erik Lindahl, Berk Hess, and others.
10 * Copyright (c) 1991-2000, University of Groningen, The Netherlands.
11 * Copyright (c) 2001-2009, The GROMACS development team,
12 * check out http://www.gromacs.org for more information.
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version 2
17 * of the License, or (at your option) any later version.
19 * If you want to redistribute modifications, please consider that
20 * scientific software is very special. Version control is crucial -
21 * bugs must be traceable. We will be happy to consider code for
22 * inclusion in the official distribution, but derived work must not
23 * be called official GROMACS. Details are found in the README & COPYING
24 * files - if they are missing, get the official version at www.gromacs.org.
26 * To help us fund GROMACS development, we humbly ask that you cite
27 * the papers on the package - you can find them in the top README file.
29 * For more info, check our website at http://www.gromacs.org
33 * Implements gmx::File.
35 * \author Teemu Murtola <teemu.murtola@cbr.su.se>
36 * \ingroup module_utility
46 #include "gromacs/utility/exceptions.h"
47 #include "gromacs/utility/gmxassert.h"
48 #include "gromacs/utility/format.h"
53 File::File(const char *filename, const char *mode)
59 File::File(const std::string &filename, const char *mode)
71 // TODO: Log the error somewhere
76 void File::open(const char *filename, const char *mode)
78 GMX_RELEASE_ASSERT(fp_ == NULL,
79 "Attempted to open the same file object twice");
80 // TODO: Port all necessary functionality from ffopen() here.
81 fp_ = fopen(filename, mode);
85 FileIOError(formatString("Could not open file '%s'", filename)),
90 void File::open(const std::string &filename, const char *mode)
92 open(filename.c_str(), mode);
97 GMX_RELEASE_ASSERT(fp_ != NULL,
98 "Attempted to close a file object that is not open");
99 bool bOk = (fclose(fp_) == 0);
103 GMX_THROW_WITH_ERRNO(
104 FileIOError("Error while closing file"), "fclose", errno);
110 GMX_RELEASE_ASSERT(fp_ != NULL,
111 "Attempted to access a file object that is not open");
115 void File::readBytes(void *buffer, size_t bytes)
117 GMX_RELEASE_ASSERT(fp_ != NULL,
118 "Attempted to access a file object that is not open");
120 // TODO: Retry based on errno or something else?
121 size_t bytesRead = std::fread(buffer, 1, bytes, fp_);
122 if (bytesRead != bytes)
126 GMX_THROW(FileIOError(
127 formatString("Premature end of file\n"
128 "Attempted to read: %d bytes\n"
129 "Successfully read: %d bytes",
130 static_cast<int>(bytes),
131 static_cast<int>(bytesRead))));
135 GMX_THROW_WITH_ERRNO(FileIOError("Error while reading file"),
142 std::string File::readToString(const char *filename)
144 File file(filename, "r");
145 FILE *fp = file.handle();
147 if (std::fseek(fp, 0L, SEEK_END) != 0)
149 GMX_THROW_WITH_ERRNO(FileIOError("Seeking to end of file failed"),
152 long len = std::ftell(fp);
155 GMX_THROW_WITH_ERRNO(FileIOError("Reading file length failed"),
158 if (std::fseek(fp, 0L, SEEK_SET) != 0)
160 GMX_THROW_WITH_ERRNO(FileIOError("Seeking to start of file failed"),
164 std::vector<char> data(len);
165 file.readBytes(&data[0], len);
166 std::string result(&data[0], len);
173 std::string File::readToString(const std::string &filename)
175 return readToString(filename.c_str());