authorgravatar for vulfox91@gmail.comDustin Taylor <vulfox91@gmail.com> 2021-06-08 11:34:57-06:00
committergravatar for andrew@ziglang.orgAndrew Kelley <andrew@ziglang.org> 2021-06-08 12:27:22-07:00
log0c25ff81a388ea1c03721562b0abea7e4dc43cbd
tree9e006a785a06e70326d406efde0b308ec3d9e4d6
parent39c80942e76be0d40b2e11247577f64cbc607666

Limit Fixed Buffer Stream seekTo (#9023)

1 files changed, 11 insertions(+), 4 deletions(-)

lib/std/io/fixed_buffer_stream.zig+11-4
......@@ -81,7 +81,7 @@ pub fn FixedBufferStream(comptime Buffer: type) type {
8181 }
8282
8383 pub fn seekTo(self: *Self, pos: u64) SeekError!void {
84 self.pos = if (std.math.cast(usize, pos)) |x| x else |_| self.buffer.len;
84 self.pos = if (std.math.cast(usize, pos)) |x| std.math.min(self.buffer.len, x) else |_| self.buffer.len;
8585 }
8686
8787 pub fn seekBy(self: *Self, amt: i64) SeekError!void {
......@@ -155,6 +155,9 @@ test "FixedBufferStream output 2" {
155155
156156 try testing.expectError(error.NoSpaceLeft, fbs.writer().writeAll("Hello world!"));
157157 try testing.expect(mem.eql(u8, fbs.getWritten(), "Hello worl"));
158
159 try fbs.seekTo((try fbs.getEndPos()) + 1);
160 try testing.expectError(error.NoSpaceLeft, fbs.writer().writeAll("H"));
158161}
159162
160163test "FixedBufferStream input" {
......@@ -163,14 +166,18 @@ test "FixedBufferStream input" {
163166
164167 var dest: [4]u8 = undefined;
165168
166 var read = try fbs.reader().read(dest[0..4]);
169 var read = try fbs.reader().read(&dest);
167170 try testing.expect(read == 4);
168171 try testing.expect(mem.eql(u8, dest[0..4], bytes[0..4]));
169172
170 read = try fbs.reader().read(dest[0..4]);
173 read = try fbs.reader().read(&dest);
171174 try testing.expect(read == 3);
172175 try testing.expect(mem.eql(u8, dest[0..3], bytes[4..7]));
173176
174 read = try fbs.reader().read(dest[0..4]);
177 read = try fbs.reader().read(&dest);
178 try testing.expect(read == 0);
179
180 try fbs.seekTo((try fbs.getEndPos()) + 1);
181 read = try fbs.reader().read(&dest);
175182 try testing.expect(read == 0);
176183}