func (mFile *mmapFileImpl) Read(data []byte) (int, error) {
start := _HeaderSize + mFile.pos
end := math.MinInt(mFile.mapSize, start+len(data))
length := end - start
if end > mFile.mapSize {
return 0, errors.New("Tried to read beyond end of file")
}
if length > _MaxFileSize {
log.Fatal("File too large")
}
check := copy(data, mFile.memmap[start:])
if check != length {
log.Fatal("Could not read entire length")
}
// Moved on
mFile.pos = end
return length, nil
}
func (mFile *mmapFileImpl) Seek(pos int, from fs.FileOffset) {
switch from {
case fs.Beginning:
mFile.pos = pos
case fs.Current:
mFile.pos = pos + pos
case fs.End:
mFile.pos = mFile.mapSize - pos
}
mFile.pos = math.MaxInt(0, math.MinInt(mFile.pos, mFile.mapSize-1))
}