Fix #69279: Compressed ZIP Phar extractTo() creates garbage files

When extracting compressed files from an uncompressed Phar, we must not
use the direct file pointer, but rather get an uncompressed file
pointer.

We also add a test to show that deflated and stored entries are
properly extracted.

This also fixes #79912, which appears to be a duplicate of #69279.

Co-authored-by: Anna Filina <afilina@gmail.com>

Closes GH-6599.

NEWS

@@ -25,6 +25,8 @@ PHP                                                                        NEWS
 
 - Phar:
   . Fixed bug #77565 (Incorrect locator detection in ZIP-based phars). (cmb)
+  . Fixed bug #69279 (Compressed ZIP Phar extractTo() creates garbage files).
+    (cmb)
 
 07 Jan 2021, PHP 7.4.14
 

ext/phar/phar_object.c

@@ -4275,7 +4275,7 @@ static int phar_extract_file(zend_bool overwrite, phar_entry_info *entry, char *
 		return FAILURE;
 	}
 
-	if (!phar_get_efp(entry, 0)) {
+	if ((phar_get_fp_type(entry) == PHAR_FP && (entry->flags & PHAR_ENT_COMPRESSION_MASK)) || !phar_get_efp(entry, 0)) {
 		if (FAILURE == phar_open_entry_fp(entry, error, 1)) {
 			if (error) {
 				spprintf(error, 4096, "Cannot extract \"%s\" to \"%s\", unable to open internal file pointer: %s", entry->filename, fullpath, *error);

ext/phar/tests/bug69279.phpt

@@ -0,0 +1,29 @@
+--TEST--
+Bug #69279 (Compressed ZIP Phar extractTo() creates garbage files)
+--SKIPIF--
+<?php
+if (!extension_loaded('phar')) die('skip phar extension not available');
+?>
+--INI--
+phar.readonly=0
+--FILE--
+<?php
+$w = new Phar(__DIR__ . "/bug69279.phar.zip");
+$w["bug69279.txt"] = "Sample content.";
+$w->compressFiles(Phar::GZ);
+unset($w);
+
+$r = new Phar(__DIR__ . "/bug69279.phar.zip");
+var_dump($r["bug69279.txt"]->isCompressed());
+
+$r->extractTo(__DIR__, NULL, TRUE);
+var_dump(file_get_contents(__DIR__ . "/bug69279.txt"));
+?>
+--EXPECT--
+bool(true)
+string(15) "Sample content."
+--CLEAN--
+<?php
+@unlink(__DIR__ . "/bug69279.txt");
+@unlink(__DIR__ . "/bug69279.phar.zip");
+?>

ext/phar/tests/bug69279a.phpt

@@ -0,0 +1,26 @@
+--TEST--
+Bug #69279 (Compressed ZIP Phar extractTo() creates garbage files)
+--SKIPIF--
+<?php
+if (!extension_loaded('phar')) die('skip phar extension not available');
+?>
+--FILE--
+<?php
+$phar = new PharData(__DIR__ . '/bug69279a.zip');
+mkdir(__DIR__ . '/bug69279a');
+var_dump($phar->extractTo(__DIR__ . '/bug69279a', null, true));
+var_dump(strncmp(file_get_contents(__DIR__ . '/bug69279a/1.txt'), 'Lorem ipsum', 11));
+var_dump(strncmp(file_get_contents(__DIR__ . '/bug69279a/2.txt'), 'foo', 3));
+var_dump(strncmp(file_get_contents(__DIR__ . '/bug69279a/3.txt'), 'Lorem ipsum', 11));
+?>
+--EXPECT--
+bool(true)
+int(0)
+int(0)
+int(0)
+--CLEAN--
+<?php
+@unlink(__DIR__ . '/bug69279a/1.txt');
+@unlink(__DIR__ . '/bug69279a/2.txt');
+@unlink(__DIR__ . '/bug69279a/3.txt');
+@rmdir(__DIR__ . '/bug69279a');

ext/phar/tests/bug79912.phpt

@@ -0,0 +1,35 @@
+--TEST--
+Bug #79912 (Phar::decompressFiles not working)
+--SKIPIF--
+<?php
+if (!extension_loaded('phar')) die('skip phar extension is not available');
+?>
+--INI--
+phar.readonly=0
+--FILE--
+<?php
+$phar = new Phar(__DIR__ . "/bug79912.phar");
+$phar->addFromString("test.txt", "This is a test file.This is a test file.This is a test file.");
+$file = $phar["test.txt"];
+var_dump($file->compress(Phar::GZ)); //true (success)
+var_dump($file->getContent());
+var_dump($file->isCompressed()); //true (the file is compressed)
+var_dump($phar->decompressFiles()); //true (success)
+var_dump($file->isCompressed()); //false (the file should not be compressed anymore)
+var_dump($phar->extractTo(__DIR__ . "/bug79912")); //true
+var_dump(file_get_contents(__DIR__ . "/bug79912/test.txt")); //the extracted file in the folder should be decompressed
+?>
+--EXPECT--
+bool(true)
+string(60) "This is a test file.This is a test file.This is a test file."
+bool(true)
+bool(true)
+bool(false)
+bool(true)
+string(60) "This is a test file.This is a test file.This is a test file."
+--CLEAN--
+<?php
+@unlink(__DIR__ . "/bug79912/test.txt");
+@rmdir(__DIR__ . "/bug79912");
+@unlink(__DIR__ . "/bug79912.phar");
+?>