flate zlib fix end of block reading

ianic · andrewrk · commit d2149106a6c0 · 2025-08-05T17:09:41.000-07:00
`n` is wanted number of bits to toss
`buffered_n` is actual number of bytes in `next_int`
diff --git a/lib/std/compress/flate/Decompress.zig b/lib/std/compress/flate/Decompress.zig
@@ -603,7 +603,7 @@ fn tossBitsEnding(d: *Decompress, n: u4) !void {
         error.EndOfStream => unreachable,
     };
     d.next_bits = next_int >> needed_bits;
-    d.remaining_bits = @intCast(@as(usize, n) * 8 -| @as(usize, needed_bits));
+    d.remaining_bits = @intCast(@as(usize, buffered_n) * 8 -| @as(usize, needed_bits));
 }
 
 fn takeBitsRuntime(d: *Decompress, n: u4) !u16 {

Original file line number	Diff line number	Diff line change
`@@ -603,7 +603,7 @@ fn tossBitsEnding(d: *Decompress, n: u4) !void {`
`603`	`603`	`error.EndOfStream => unreachable,`
`604`	`604`	`};`
`605`	`605`	`d.next_bits = next_int >> needed_bits;`
`606`		`- d.remaining_bits = @intCast(@as(usize, n) * 8 -\| @as(usize, needed_bits));`
	`606`	`+ d.remaining_bits = @intCast(@as(usize, buffered_n) * 8 -\| @as(usize, needed_bits));`
`607`	`607`	`}`
`608`	`608`
`609`	`609`	`fn takeBitsRuntime(d: *Decompress, n: u4) !u16 {`