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turbonss/lib/File.zig

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2022-04-20 07:19:34 +03:00
const std = @import("std");
const os = std.os;
const DB = @import("DB.zig");
const InvalidHeader = @import("header.zig").Invalid;
const File = @This();
db: DB,
ptr: []align(4096) const u8,
pub const Error = os.OpenError || os.FStatError || os.MMapError || InvalidHeader;
pub fn open(fname: []const u8) Error!File {
const fd = try os.open(fname, os.O.RDONLY, 0);
var fd_open = true;
errdefer {
if (fd_open) os.close(fd);
}
const st = try os.fstat(fd);
const size = @intCast(u64, st.size);
const ptr = try os.mmap(null, size, os.PROT.READ, os.MAP.SHARED, fd, 0);
errdefer os.munmap(ptr);
os.close(fd);
fd_open = false;
const db = try DB.fromBytes(ptr);
return File{ .db = db, .ptr = ptr };
}
pub fn close(self: *File) void {
os.munmap(self.ptr);
self.* = undefined;
}