Fix bug #74154: Phar extractTo creates empty files

ext/phar/phar.c

@@ -260,20 +260,26 @@ bool phar_archive_delref(phar_archive_data *phar) /* {{{ */
 		PHAR_G(last_phar) = NULL;
 		PHAR_G(last_phar_name) = PHAR_G(last_alias) = NULL;
 
+		/* This is a new phar that has perhaps had an alias/metadata set, but has never been flushed. */
+		bool remove_fname_cache = !zend_hash_num_elements(&phar->manifest);
+
 		if (phar->fp && (!(phar->flags & PHAR_FILE_COMPRESSION_MASK) || !phar->alias)) {
 			/* close open file handle - allows removal or rename of
 			the file on windows, which has greedy locking
-			only close if the archive was not already compressed.  If it
-			was compressed, then the fp does not refer to the original file.
-			We're also closing compressed files to save resources,
-			but only if the archive isn't aliased. */
+			only close if the archive was not already compressed.
+			We're also closing compressed files to save resources, but only if the archive isn't aliased.
+			If it was compressed, then the fp does not refer to the original compressed file:
+			it refers to the **uncompressed** filtered file stream.
+			Therefore, upon closing a compressed file we need to invalidate the phar archive such
+			that the code that reopens the phar will not try to use the **compressed** file as if it was uncompressed.
+			That would result in treating compressed file data as if it were compressed and using uncompressed file offsets
+			on the compressed file. */
 			php_stream_close(phar->fp);
 			phar->fp = NULL;
+			remove_fname_cache |= phar->flags & PHAR_FILE_COMPRESSION_MASK;
 		}
 
-		if (!zend_hash_num_elements(&phar->manifest)) {
-			/* this is a new phar that has perhaps had an alias/metadata set, but has never
-			been flushed */
+		if (remove_fname_cache) {
 			if (zend_hash_str_del(&(PHAR_G(phar_fname_map)), phar->fname, phar->fname_len) != SUCCESS) {
 				phar_destroy_phar_data(phar);
 			}

ext/phar/tests/bug74154.phpt

@@ -0,0 +1,40 @@
+--TEST--
+Bug #74154 (Phar extractTo creates empty files)
+--EXTENSIONS--
+phar
+--FILE--
+<?php
+
+$dir = __DIR__.'/bug74154';
+mkdir($dir);
+file_put_contents("$dir/1.txt", str_repeat('h', 64));
+file_put_contents("$dir/2.txt", str_repeat('i', 64));
+$phar = new PharData(__DIR__.'/bug74154.tar');
+$phar->buildFromDirectory($dir);
+
+$compPhar = $phar->compress(Phar::GZ);
+unset($phar); //make sure that test.tar is closed
+unlink(__DIR__.'/bug74154.tar');
+unset($compPhar); //make sure that test.tar.gz is closed
+$extractingPhar = new PharData(__DIR__.'/bug74154.tar.gz');
+$extractingPhar->extractTo($dir.'_out');
+
+var_dump(file_get_contents($dir.'_out/1.txt'));
+var_dump(file_get_contents($dir.'_out/2.txt'));
+
+?>
+--CLEAN--
+<?php
+$dir = __DIR__.'/bug74154';
+@unlink("$dir/1.txt");
+@unlink("$dir/2.txt");
+@rmdir($dir);
+@unlink($dir.'_out/1.txt');
+@unlink($dir.'_out/2.txt');
+@rmdir($dir.'_out');
+@unlink(__DIR__.'/bug74154.tar');
+@unlink(__DIR__.'/bug74154.tar.gz');
+?>
+--EXPECT--
+string(64) "hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh"
+string(64) "iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii"

ext/phar/tests/tar/bug70417.phpt

@@ -10,10 +10,11 @@ $filename = __DIR__ . '/bug70417.tar';
 $resBefore = count(get_resources());
 $arch = new PharData($filename);
 $arch->addFromString('foo', 'bar');
+$arch->addFromString('foo2', 'baz');
 $arch->compress(Phar::GZ);
 unset($arch);
 $resAfter = count(get_resources());
-var_dump($resBefore === $resAfter);
+var_dump($resAfter - $resBefore);
 ?>
 --CLEAN--
 <?php
@@ -22,4 +23,4 @@ $filename = __DIR__ . '/bug70417.tar';
 @unlink("$filename.gz");
 ?>
 --EXPECT--
-bool(true)
+int(0)