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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("Premature end of file"));
130 GMX_THROW_WITH_ERRNO(FileIOError("Error while reading file"),
137 std::string File::readToString(const char *filename)
139 File file(filename, "r");
140 FILE *fp = file.handle();
142 // TODO: Full error checking.
143 std::fseek(fp, 0L, SEEK_END);
144 long len = std::ftell(fp);
145 std::fseek(fp, 0L, SEEK_SET);
147 std::vector<char> data(len);
148 file.readBytes(&data[0], len);
149 std::string result(&data[0], len);
156 std::string File::readToString(const std::string &filename)
158 return readToString(filename.c_str());