ext/phar: avoid redundant allocation by using zend_string for alias

Author: arshidkv12

ext/phar/zip.c

@@ -630,7 +630,8 @@ zend_result phar_parse_zipfile(php_stream *fp, const char *fname, size_t fname_l
 				php_stream_filter_append(&fp->readfilters, filter);
 
 				actual_alias = php_stream_copy_to_mem(fp, entry.uncompressed_filesize, 0);
-				if (!actual_alias || !entry.uncompressed_filesize) {
+				entry.uncompressed_filesize = ZSTR_LEN(actual_alias);
+				if (!entry.uncompressed_filesize) {
 					php_stream_filter_remove(filter, 1);
 					zend_string_release_ex(entry.filename, entry.is_persistent);
 					PHAR_ZIP_FAIL("unable to read in alias, truncated");
@@ -649,7 +650,8 @@ zend_result phar_parse_zipfile(php_stream *fp, const char *fname, size_t fname_l
 
 				php_stream_filter_append(&fp->readfilters, filter);
 				actual_alias = php_stream_copy_to_mem(fp, entry.uncompressed_filesize, 0);
-				if (!actual_alias || !entry.uncompressed_filesize) {
+				entry.uncompressed_filesize = ZSTR_LEN(actual_alias);
+				if (!entry.uncompressed_filesize) {
 					php_stream_filter_remove(filter, 1);
 					zend_string_release_ex(entry.filename, entry.is_persistent);
 					PHAR_ZIP_FAIL("unable to read in alias, truncated");
@@ -659,7 +661,8 @@ zend_result phar_parse_zipfile(php_stream *fp, const char *fname, size_t fname_l
 				php_stream_filter_remove(filter, 1);
 			} else {
 				actual_alias = php_stream_copy_to_mem(fp, entry.uncompressed_filesize, 0);
-				if (!actual_alias || !entry.uncompressed_filesize) {
+				entry.uncompressed_filesize = ZSTR_LEN(actual_alias);
+				if (!entry.uncompressed_filesize) {
 					zend_string_release_ex(entry.filename, entry.is_persistent);
 					PHAR_ZIP_FAIL("unable to read in alias, truncated");
 				}