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Merge pull request #25105 from binarycraft007/lzma2-fix

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lzma2: fix array list looping logic in appendLz
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Andrew Kelley 2025-09-02 13:16:09 -07:00 committed by GitHub
commit d51d18c986
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1 changed files with 11 additions and 10 deletions
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21
lib/std/compress/lzma2.zig
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@ -79,17 +79,18 @@ pub const AccumBuffer = struct {
_ = writer;
const buf_len = self.buf.items.len;
if (dist > buf_len) {
return error.CorruptInput;
}
if (dist > buf_len) return error.CorruptInput;
var offset = buf_len - dist;
var i: usize = 0;
while (i < len) : (i += 1) {
const x = self.buf.items[offset];
try self.buf.append(allocator, x);
offset += 1;
}
try self.buf.ensureUnusedCapacity(allocator, len);
const buffer = self.buf.allocatedSlice();
const src = buffer[buf_len - dist ..][0..len];
const dst = buffer[buf_len..][0..len];
// This is not a @memmove; it intentionally repeats patterns caused by
// iterating one byte at a time.
for (dst, src) |*d, s| d.* = s;
self.buf.items.len = buf_len + len;
self.len += len;
}