authorgravatar for andrew@ziglang.orgAndrew Kelley <andrew@ziglang.org> 2025-01-21 18:37:28-05:00
committergravatar for noreply@github.comGitHub <noreply@github.com> 2025-01-21 18:37:28-05:00
logf07bea20dab813fa1b25c3b3a7abe2fc8c992132
tree93bed5c5b3d0fe685048df84b2fd6586183f9329
parent97b97ae6202811e207196920018c3b9610957f90
parent09d021c908b2c0c320e5b250656a3460ef07736c
signaturebadge-check Signed by PGP key B5690EEEBB952194

Merge pull request #21447 from Szwagi/fix-lzma-memcpy-alias

Fix memcpy alias bug in std.compress.lzma

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

lib/std/compress/lzma.zig+1-1
......@@ -77,7 +77,7 @@ pub fn Decompress(comptime ReaderType: type) type {
7777 const input = self.to_read.items;
7878 const n = @min(input.len, output.len);
7979 @memcpy(output[0..n], input[0..n]);
80 @memcpy(input[0 .. input.len - n], input[n..]);
80 std.mem.copyForwards(u8, input[0 .. input.len - n], input[n..]);
8181 self.to_read.shrinkRetainingCapacity(input.len - n);
8282 return n;
8383 }
lib/std/compress/lzma/test.zig+10
......@@ -87,3 +87,13 @@ test "too small uncompressed size in header" {
8787 @embedFile("testdata/bad-too_small_size-without_eopm-3.lzma"),
8888 );
8989}
90
91test "reading one byte" {
92 const compressed = @embedFile("testdata/good-known_size-with_eopm.lzma");
93 var stream = std.io.fixedBufferStream(compressed);
94 var decompressor = try lzma.decompress(std.testing.allocator, stream.reader());
95 defer decompressor.deinit();
96
97 var buffer = [1]u8{0};
98 _ = try decompressor.read(buffer[0..]);
99}