Avoid signed shift in minizip zip.c.

madler · madler · commit 99b229487c29 · 2024-03-12T13:40:57.000-07:00
diff --git a/contrib/minizip/zip.c b/contrib/minizip/zip.c
@@ -356,7 +356,7 @@ local int block_get(block_t *block) {
 // if the end is reached.
 local long block_get2(block_t *block) {
     long got = block_get(block);
-    return got | ((long)block_get(block) << 8);
+    return got | ((unsigned long)block_get(block) << 8);
 }
 
 // Read up to len bytes from block into buf. Return the number of bytes read.

Original file line number	Diff line number	Diff line change
`@@ -356,7 +356,7 @@ local int block_get(block_t *block) {`
`356`	`356`	`// if the end is reached.`
`357`	`357`	`local long block_get2(block_t *block) {`
`358`	`358`	`long got = block_get(block);`
`359`		`- return got \| ((long)block_get(block) << 8);`
	`359`	`+ return got \| ((unsigned long)block_get(block) << 8);`
`360`	`360`	`}`
`361`	`361`
`362`	`362`	`// Read up to len bytes from block into buf. Return the number of bytes read.`