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const std = @import("std");
const Reader = std.Io.Reader;
const Writer = std.Io.Writer;
const Allocator = std.mem.Allocator;
const Payload = @This();
len: u32,
short: [128]u8,
long: ?[]u8,
pub fn read(alloc: Allocator, in: *Reader, bytes: usize) !Payload {
var res: Payload = .{
.len = @intCast(bytes),
.short = undefined,
.long = null,
};
try in.readSliceAll(res.short[0..@min(bytes, res.short.len)]);
if (bytes > res.short.len) {
const long = try alloc.alloc(u8, bytes - res.short.len);
errdefer alloc.free(long);
try in.readSliceAll(long);
res.long = long;
}
return res;
}
pub fn write(self: Payload, out: *Writer) !void {
std.debug.assert(out.buffer.len >= self.short.len);
std.debug.assert(self.len <= self.short.len or self.long != null);
try out.writeAll(self.short[0..@min(self.len, self.short.len)]);
if (self.long) |l| {
try out.writeAll(l);
}
}
pub fn deinit(self: Payload, alloc: Allocator) void {
if (self.long) |l| {
alloc.free(l);
}
}
pub fn dupe(self: Payload, alloc: Allocator) !Payload {
var res = self;
if (self.long) |l| {
res.long = try alloc.dupe(u8, l);
}
errdefer if (res.long) |l| alloc.free(l);
return res;
}
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