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buffer.zig
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202 lines (161 loc) · 6.57 KB
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const std = @import("std");
const zio = @import("zio");
/// Default buffer size for line reading (4KB)
pub const DEFAULT_BUFFER_SIZE: usize = 4096;
/// Maximum line length for HTTP headers (prevents DoS via large headers)
pub const MAX_LINE_LENGTH: usize = 8192;
/// Buffer size for I/O operations (8KB)
pub const IO_BUFFER_SIZE: usize = 8192;
pub const LineReader = struct {
allocator: std.mem.Allocator,
max_len: usize,
buf: [4096]u8 = undefined,
start: usize = 0,
end: usize = 0,
pub fn init(allocator: std.mem.Allocator, max_len: usize) LineReader {
return .{ .allocator = allocator, .max_len = max_len };
}
pub fn deinit(self: *LineReader) void {
_ = self;
}
pub fn readLine(self: *LineReader, _: *zio.Runtime, stream: *zio.net.Stream) ![]u8 {
var out = std.ArrayList(u8).empty;
errdefer out.deinit(self.allocator);
while (true) {
if (self.start == self.end) {
self.start = 0;
self.end = try stream.read(&self.buf, .none);
if (self.end == 0) return error.EndOfStream;
}
const slice = self.buf[self.start..self.end];
if (std.mem.indexOfScalar(u8, slice, '\n')) |pos| {
const chunk = slice[0 .. pos + 1];
// Check max length before appending to prevent overflow
if (out.items.len + chunk.len > self.max_len) return error.LineTooLong;
try out.appendSlice(self.allocator, chunk);
self.start += pos + 1;
break;
}
// Check max length before appending to prevent overflow
if (out.items.len + slice.len > self.max_len) return error.LineTooLong;
try out.appendSlice(self.allocator, slice);
self.start = self.end;
}
return try out.toOwnedSlice(self.allocator);
}
pub fn read(self: *LineReader, _: *zio.Runtime, stream: *zio.net.Stream, out: []u8) !usize {
if (out.len == 0) return 0;
if (self.start < self.end) {
const available = self.end - self.start;
const n = @min(available, out.len);
std.mem.copyForwards(u8, out[0..n], self.buf[self.start .. self.start + n]);
self.start += n;
return n;
}
return stream.read(out, .none);
}
pub fn read_exact(self: *LineReader, rt: *zio.Runtime, stream: *zio.net.Stream, out: []u8) !void {
var offset: usize = 0;
while (offset < out.len) {
const n = try self.read(rt, stream, out[offset..]);
if (n == 0) return error.EndOfStream;
offset += n;
}
}
/// Flush any buffered data to the given writer stream.
/// Returns the number of bytes flushed.
pub fn flush_to(self: *LineReader, _: *zio.Runtime, writer: *zio.net.Stream) !usize {
if (self.start >= self.end) return 0;
const buffered = self.buf[self.start..self.end];
try writer.writeAll(buffered, .none);
const flushed = buffered.len;
self.start = self.end;
return flushed;
}
};
fn server_task(rt: *zio.Runtime, ready: *zio.ResetEvent) !void {
const addr = try zio.net.IpAddress.parseIp4("127.0.0.1", 18081);
var server = try addr.listen(.{ .reuse_address = true });
defer server.close();
ready.set();
var stream = try server.accept();
defer stream.close();
var reader = LineReader.init(rt.allocator, 1024);
defer reader.deinit();
const line = try reader.readLine(rt, &stream);
defer rt.allocator.free(line);
try std.testing.expectEqualStrings("GET / HTTP/1.1\r\n", line);
}
test "line reader reads one line" {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
const rt = try zio.Runtime.init(gpa.allocator(), .{ .executors = .exact(1) });
defer rt.deinit();
var ready = zio.ResetEvent.init;
var server = try rt.spawn(server_task, .{ rt, &ready });
try ready.wait();
const addr = try zio.net.IpAddress.parseIp4("127.0.0.1", 18081);
var client = try addr.connect(.{});
defer client.close();
try client.writeAll("GET / HTTP/1.1\r\n", .none);
try server.join();
}
fn server_read_buffered(rt: *zio.Runtime, ready: *zio.ResetEvent) !void {
const addr = try zio.net.IpAddress.parseIp4("127.0.0.1", 18084);
var server = try addr.listen(.{ .reuse_address = true });
defer server.close();
ready.set();
var stream = try server.accept();
defer stream.close();
var reader = LineReader.init(rt.allocator, 1024);
defer reader.deinit();
const line = try reader.readLine(rt, &stream);
defer rt.allocator.free(line);
var buf: [4]u8 = undefined;
const n = try reader.read(rt, &stream, &buf);
try std.testing.expectEqual(@as(usize, 4), n);
try std.testing.expectEqualStrings("BODY", &buf);
}
test "line reader reads buffered bytes" {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
const rt = try zio.Runtime.init(gpa.allocator(), .{ .executors = .exact(1) });
defer rt.deinit();
var ready = zio.ResetEvent.init;
var server = try rt.spawn(server_read_buffered, .{ rt, &ready });
try ready.wait();
const addr = try zio.net.IpAddress.parseIp4("127.0.0.1", 18084);
var client = try addr.connect(.{});
defer client.close();
try client.writeAll("GET / HTTP/1.1\r\nBODY", .none);
try server.join();
}
fn server_read_exact(rt: *zio.Runtime, ready: *zio.ResetEvent) !void {
const addr = try zio.net.IpAddress.parseIp4("127.0.0.1", 18085);
var server = try addr.listen(.{ .reuse_address = true });
defer server.close();
ready.set();
var stream = try server.accept();
defer stream.close();
var reader = LineReader.init(rt.allocator, 1024);
defer reader.deinit();
const line = try reader.readLine(rt, &stream);
defer rt.allocator.free(line);
var buf: [5]u8 = undefined;
try reader.read_exact(rt, &stream, &buf);
try std.testing.expectEqualStrings("HELLO", &buf);
}
test "line reader read_exact fills buffer" {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
const rt = try zio.Runtime.init(gpa.allocator(), .{ .executors = .exact(1) });
defer rt.deinit();
var ready = zio.ResetEvent.init;
var server = try rt.spawn(server_read_exact, .{ rt, &ready });
try ready.wait();
const addr = try zio.net.IpAddress.parseIp4("127.0.0.1", 18085);
var client = try addr.connect(.{});
defer client.close();
try client.writeAll("GET / HTTP/1.1\r\nHELLO", .none);
try server.join();
}