162 lines
3.6 KiB
C++
162 lines
3.6 KiB
C++
/*
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* Copyright 2014-2019 Max Kellermann <max.kellermann@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "FileReader.hxx"
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#include "fs/FileInfo.hxx"
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#include "system/Error.hxx"
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#include "io/Open.hxx"
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#include <cassert>
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#ifdef _WIN32
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FileReader::FileReader(Path _path)
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:path(_path),
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handle(CreateFile(path.c_str(), GENERIC_READ, FILE_SHARE_READ,
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nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
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nullptr))
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{
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if (handle == INVALID_HANDLE_VALUE)
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throw FormatLastError("Failed to open %s", path.ToUTF8().c_str());
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}
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FileInfo
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FileReader::GetFileInfo() const
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{
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assert(IsDefined());
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return FileInfo(path);
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}
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size_t
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FileReader::Read(void *data, size_t size)
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{
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assert(IsDefined());
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DWORD nbytes;
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if (!ReadFile(handle, data, size, &nbytes, nullptr))
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throw FormatLastError("Failed to read from %s",
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path.ToUTF8().c_str());
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return nbytes;
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}
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void
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FileReader::Seek(off_t offset)
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{
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assert(IsDefined());
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auto result = SetFilePointer(handle, offset, nullptr, FILE_BEGIN);
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if (result == INVALID_SET_FILE_POINTER)
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throw MakeLastError("Failed to seek");
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}
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void
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FileReader::Skip(off_t offset)
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{
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assert(IsDefined());
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auto result = SetFilePointer(handle, offset, nullptr, FILE_CURRENT);
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if (result == INVALID_SET_FILE_POINTER)
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throw MakeLastError("Failed to seek");
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}
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void
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FileReader::Close() noexcept
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{
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assert(IsDefined());
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CloseHandle(handle);
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}
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#else
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FileReader::FileReader(Path _path)
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:path(_path), fd(OpenReadOnly(path.c_str()))
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{
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}
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FileInfo
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FileReader::GetFileInfo() const
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{
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assert(IsDefined());
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FileInfo info;
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const bool success = fstat(fd.Get(), &info.st) == 0;
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if (!success)
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throw FormatErrno("Failed to access %s",
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path.ToUTF8().c_str());
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return info;
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}
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size_t
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FileReader::Read(void *data, size_t size)
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{
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assert(IsDefined());
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ssize_t nbytes = fd.Read(data, size);
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if (nbytes < 0)
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throw FormatErrno("Failed to read from %s", path.ToUTF8().c_str());
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return nbytes;
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}
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void
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FileReader::Seek(off_t offset)
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{
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assert(IsDefined());
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auto result = fd.Seek(offset);
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const bool success = result >= 0;
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if (!success)
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throw MakeErrno("Failed to seek");
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}
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void
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FileReader::Skip(off_t offset)
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{
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assert(IsDefined());
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auto result = fd.Skip(offset);
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const bool success = result >= 0;
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if (!success)
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throw MakeErrno("Failed to seek");
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}
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void
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FileReader::Close() noexcept
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{
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assert(IsDefined());
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fd.Close();
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}
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#endif
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