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const std = @import("std");
/// Decode date from the buffer that has been encoded in the same way that
/// `bash`'s `printf %q` encodes a string and write it to the writer. If an
/// error is returned garbage may have been written to the buffer.
pub fn printfQDecode(writer: *std.Io.Writer, buf: []const u8) (std.Io.Writer.Error || error{DecodeError})!void {
const data: []const u8 = data: {
// Strip off `$''` quoting.
if (std.mem.startsWith(u8, buf, "$'")) {
if (buf.len < 3 or !std.mem.endsWith(u8, buf, "'")) return error.DecodeError;
break :data buf[2 .. buf.len - 1];
}
// Strip off `''` quoting.
if (std.mem.startsWith(u8, buf, "'")) {
if (buf.len < 2 or !std.mem.endsWith(u8, buf, "'")) return error.DecodeError;
break :data buf[1 .. buf.len - 1];
}
break :data buf;
};
var src: usize = 0;
while (src < data.len) {
switch (data[src]) {
else => {
try writer.writeByte(data[src]);
src += 1;
},
'\\' => {
if (src + 1 >= data.len) return error.DecodeError;
switch (data[src + 1]) {
' ',
'\\',
'"',
'\'',
'$',
=> |c| {
try writer.writeByte(c);
src += 2;
},
'e' => {
try writer.writeByte(std.ascii.control_code.esc);
src += 2;
},
'n' => {
try writer.writeByte(std.ascii.control_code.lf);
src += 2;
},
'r' => {
try writer.writeByte(std.ascii.control_code.cr);
src += 2;
},
't' => {
try writer.writeByte(std.ascii.control_code.ht);
src += 2;
},
'v' => {
try writer.writeByte(std.ascii.control_code.vt);
src += 2;
},
else => return error.DecodeError,
}
},
}
}
}
test "printf_q 1" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: []const u8 = "bobr\\ kurwa";
try printfQDecode(&w.writer, s);
try std.testing.expectEqualStrings("bobr kurwa", w.written());
}
test "printf_q 2" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: [:0]const u8 = "bobr\\nkurwa";
try printfQDecode(&w.writer, s);
try std.testing.expectEqualStrings("bobr\nkurwa", w.written());
}
test "printf_q 3" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: [:0]const u8 = "bobr\\dkurwa";
try std.testing.expectError(error.DecodeError, printfQDecode(&w.writer, s));
}
test "printf_q 4" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: [:0]const u8 = "bobr kurwa\\";
try std.testing.expectError(error.DecodeError, printfQDecode(&w.writer, s));
}
test "printf_q 5" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: [:0]const u8 = "$'bobr kurwa'";
try printfQDecode(&w.writer, s);
try std.testing.expectEqualStrings("bobr kurwa", w.written());
}
test "printf_q 6" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: [:0]const u8 = "'bobr kurwa'";
try printfQDecode(&w.writer, s);
try std.testing.expectEqualStrings("bobr kurwa", w.written());
}
test "printf_q 7" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: [:0]const u8 = "$'bobr kurwa";
try std.testing.expectError(error.DecodeError, printfQDecode(&w.writer, s));
}
test "printf_q 8" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: [:0]const u8 = "$'";
var src: [s.len:0]u8 = undefined;
@memcpy(&src, s);
try std.testing.expectError(error.DecodeError, printfQDecode(&w.writer, s));
}
test "printf_q 9" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: [:0]const u8 = "'bobr kurwa";
var src: [s.len:0]u8 = undefined;
@memcpy(&src, s);
try std.testing.expectError(error.DecodeError, printfQDecode(&w.writer, s));
}
test "printf_q 10" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: [:0]const u8 = "'";
var src: [s.len:0]u8 = undefined;
@memcpy(&src, s);
try std.testing.expectError(error.DecodeError, printfQDecode(&w.writer, s));
}
/// Decode data from the buffer that has been URL percent encoded and write
/// it to the given buffer. If an error is returned the garbage may have been
/// written to the writer.
pub fn urlPercentDecode(writer: *std.Io.Writer, buf: []const u8) (std.Io.Writer.Error || error{DecodeError})!void {
var src: usize = 0;
while (src < buf.len) {
switch (buf[src]) {
else => {
try writer.writeByte(buf[src]);
src += 1;
},
'%' => {
if (src + 2 >= buf.len) return error.DecodeError;
switch (buf[src + 1]) {
'0'...'9', 'a'...'f', 'A'...'F' => {
switch (buf[src + 2]) {
'0'...'9', 'a'...'f', 'A'...'F' => {
try writer.writeByte(std.math.shl(u8, hex(buf[src + 1]), 4) | hex(buf[src + 2]));
src += 3;
},
else => return error.DecodeError,
}
},
else => return error.DecodeError,
}
},
}
}
}
inline fn hex(c: u8) u4 {
switch (c) {
'0'...'9' => return @truncate(c - '0'),
'a'...'f' => return @truncate(c - 'a' + 10),
'A'...'F' => return @truncate(c - 'A' + 10),
else => unreachable,
}
}
test "singles percent" {
for (0..255) |c| {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
var buf_: [4]u8 = undefined;
const buf = try std.fmt.bufPrintZ(&buf_, "%{x:0>2}", .{c});
try urlPercentDecode(&w.writer, buf);
const decoded = w.written();
try std.testing.expectEqual(1, decoded.len);
try std.testing.expectEqual(c, decoded[0]);
}
for (0..255) |c| {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
var buf_: [4]u8 = undefined;
const buf = try std.fmt.bufPrintZ(&buf_, "%{X:0>2}", .{c});
try urlPercentDecode(&w.writer, buf);
const decoded = w.written();
try std.testing.expectEqual(1, decoded.len);
try std.testing.expectEqual(c, decoded[0]);
}
}
test "percent 1" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: []const u8 = "bobr%20kurwa";
try urlPercentDecode(&w.writer, s);
try std.testing.expectEqualStrings("bobr kurwa", w.written());
}
test "percent 2" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: []const u8 = "bobr%2kurwa";
try std.testing.expectError(error.DecodeError, urlPercentDecode(&w.writer, s));
}
test "percent 3" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: []const u8 = "bobr%kurwa";
try std.testing.expectError(error.DecodeError, urlPercentDecode(&w.writer, s));
}
test "percent 4" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: []const u8 = "bobr%%kurwa";
try std.testing.expectError(error.DecodeError, urlPercentDecode(&w.writer, s));
}
test "percent 5" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: []const u8 = "bobr%20kurwa%20";
try urlPercentDecode(&w.writer, s);
try std.testing.expectEqualStrings("bobr kurwa ", w.written());
}
test "percent 6" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: []const u8 = "bobr%20kurwa%2";
try std.testing.expectError(error.DecodeError, urlPercentDecode(&w.writer, s));
}
test "percent 7" {
var w: std.Io.Writer.Allocating = .init(std.testing.allocator);
defer w.deinit();
const s: []const u8 = "bobr%20kurwa%";
try std.testing.expectError(error.DecodeError, urlPercentDecode(&w.writer, s));
}
/// Is the given character valid in URI percent encoding?
fn isValidChar(c: u8) bool {
return switch (c) {
' ', ';', '=' => false,
else => return std.ascii.isPrint(c),
};
}
/// Write data to the writer after URI percent encoding.
pub fn urlPercentEncode(writer: *std.Io.Writer, data: []const u8) std.Io.Writer.Error!void {
try std.Uri.Component.percentEncode(writer, data, isValidChar);
}
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