Fix #80654: file_get_contents() maxlen fails above (2**31)-1 bytes

We remove the arbitrary restriction to `INT_MAX`; it is superfluous on
32bit systems where `ZEND_LONG_MAX == INT_MAX` anyway, and not useful
on 64bit systems, where larger files should be readable, if the
`memory_limit` is large enough.

Closes GH-6648.

Author: cmb69

NEWS

@@ -10,6 +10,10 @@ PHP                                                                        NEWS
     semicolon) (cmb)
   . Fixed bug #70091 (Phar does not mark UTF-8 filenames in ZIP archives). (cmb)
 
+- Standard:
+  . Fixed bug #80654 (file_get_contents() maxlen fails above (2**31)-1 bytes).
+    (cmb)
+
 - Zip:
   . Fixed bug #80648 (Fix for bug 79296 should be based on runtime version).
     (cmb, Remi)

ext/standard/file.c

@@ -564,10 +564,6 @@ PHP_FUNCTION(file_get_contents)
 		RETURN_FALSE;
 	}
 
-	if (maxlen > INT_MAX) {
-		php_error_docref(NULL, E_WARNING, "maxlen truncated from " ZEND_LONG_FMT " to %d bytes", maxlen, INT_MAX);
-		maxlen = INT_MAX;
-	}
 	if ((contents = php_stream_copy_to_mem(stream, maxlen, 0)) != NULL) {
 		RETVAL_STR(contents);
 	} else {

ext/standard/streamsfuncs.c

@@ -456,10 +456,6 @@ PHP_FUNCTION(stream_get_contents)
 		}
 	}
 
-	if (maxlen > INT_MAX) {
-		php_error_docref(NULL, E_WARNING, "maxlen truncated from " ZEND_LONG_FMT " to %d bytes", maxlen, INT_MAX);
-		maxlen = INT_MAX;
-	}
 	if ((contents = php_stream_copy_to_mem(stream, maxlen, 0))) {
 		RETURN_STR(contents);
 	} else {