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zig source #1
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//For this experiment I combind the in & out slice streams pub const SliceStream = struct { data: []u8, rpos: usize, wpos: usize, pub fn init(data: []u8) SliceStream { return SliceStream { .data = data, .rpos = 0, .wpos = 0, }; } pub fn read(self: *SliceStream, buffer: []u8) error{}!usize { if(self.rpos >= self.data.len) return 0; const len = if(self.data.len - self.rpos > buffer.len) buffer.len else self.data.len - self.rpos; for(self.data[self.rpos..self.rpos + len]) |b, i| buffer[i] = b; self.rpos += len; return len; } pub fn write(self: *SliceStream, buffer: []const u8) !void { if(self.wpos >= self.data.len) return error.BufferOverrun; if(self.data.len - self.wpos < buffer.len) return error.BufferTooSmall; for(self.data[self.wpos..self.wpos + buffer.len]) |*b, i| b.* = buffer[i]; self.wpos += buffer.len; } }; //Simplified InStream pub fn InStream(comptime T: type) type { return struct { pub const Self = @This(); impl: *T, pub fn init(impl: *T) Self { return Self { .impl = impl, }; } pub fn read(self: *Self, buffer: []u8) !usize { return self.impl.read(buffer); } pub fn readByte(self: *Self) !u8 { var buffer: [1]u8 = undefined; const size = try self.read(buffer[0..]); if(size != 1) return error.EndOfStream; return buffer[0]; } }; } //For runtime dispatch we have to be really generic //There may be a way to use @TypeInfo to automatically // construct runtime versions of an interface... pub const RuntimeStream = struct { readFn: ReadFn, writeFn: WriteFn, context: *c_void, const ReadFn = fn(*c_void,[]u8)anyerror!usize; const WriteFn = fn(*c_void,[]const u8)anyerror!void; pub fn init(impl: var) RuntimeStream { const T = @typeOf(impl); return RuntimeStream { .readFn = @ptrCast(ReadFn, T.Child.read), .writeFn = @ptrCast(WriteFn, T.Child.write), .context = @ptrCast(*c_void, impl), }; } pub fn read(self: *RuntimeStream, buffer: []u8) anyerror!usize { return self.readFn(self.context, buffer); } pub fn write(self: *RuntimeStream, buffer: []const u8) anyerror!void { return self.writeFn(self.context, buffer); } }; export fn foo() usize { var ret = usize(0); var mem: [100]u8 = undefined; //Functions using this interface have to take `var` var slice_stream = SliceStream.init(mem[0..]); var in_stream = InStream(SliceStream).init(&slice_stream); slice_stream.write("0123456789") catch {}; for("0123456789") |b, i| ret += in_stream.readByte() catch 0; slice_stream.rpos = 0; //We can wrap the runtime version with the same interface // and functions can take `*InStream(RuntimeStream)` var runtime_stream = RuntimeStream.init(&slice_stream); var runtime_in_stream = InStream(RuntimeStream).init(&runtime_stream); for("0123456789") |b, i| ret += runtime_in_stream.readByte() catch 0; return ret; }
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