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use io;
use types;
use fmt;
export const length: u64 = 512;
export fn lba(no: u64) size = {
return no * length;
};
export type sector = struct {
buf: []u8,
fd: io::file,
lba_begin: u64,
lba_end: u64,
};
export fn map(fd: io::file, lba_begin: u64, lba_end: u64) sector = {
let self = sector {
buf = alloc([0...], (lba_end - lba_begin + 1)*length),
fd = fd,
lba_begin = lba_begin,
lba_end = lba_end
};
return self;
};
export fn finish(self: *sector) void = {
free(self.buf);
};
export fn fetch(self: *sector) void = {
// XXX proper error
io::seek(self.fd, (self.lba_begin * length): io::off, io::whence::SET)!;
io::read(self.fd, self.buf)!;
};
export fn commit(self: *sector) void = {
io::seek(self.fd, (self.lba_begin * length): io::off, io::whence::SET)!;
io::write(self.fd, self.buf)!;
};
export fn commit_at(self: *sector, fd: io::file, lba: u64) void = {
io::seek(fd, (lba * length): io::off, io::whence::SET)!;
io::write(fd, self.buf)!;
};
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