Merge branch 'PHP-8.4'

* PHP-8.4:
  Fix phar crash and file corruption with SplFileObject

Author: nielsdos

ext/phar/phar.c

@@ -2708,7 +2708,7 @@ void phar_flush_ex(phar_archive_data *phar, zend_string *user_stub, bool is_defa
 			/* remove this from the new phar */
 			continue;
 		}
-		if (!entry->is_modified && entry->fp_refcount) {
+		if (entry->fp_refcount) {
 			/* open file pointers refer to this fp, do not free the stream */
 			switch (entry->fp_type) {
 				case PHAR_FP:

ext/phar/stream.c

@@ -445,12 +445,12 @@ static ssize_t phar_stream_write(php_stream *stream, const char *buf, size_t cou
 {
 	phar_entry_data *data = (phar_entry_data *) stream->abstract;
 
-	php_stream_seek(data->fp, data->position, SEEK_SET);
+	php_stream_seek(data->fp, data->position + data->zero, SEEK_SET);
 	if (count != php_stream_write(data->fp, buf, count)) {
 		php_stream_wrapper_log_error(stream->wrapper, stream->flags, "phar error: Could not write %d characters to \"%s\" in phar \"%s\"", (int) count, ZSTR_VAL(data->internal_file->filename), data->phar->fname);
 		return -1;
 	}
-	data->position = php_stream_tell(data->fp);
+	data->position = php_stream_tell(data->fp) - data->zero;
 	if (data->position > (zend_off_t)data->internal_file->uncompressed_filesize) {
 		data->internal_file->uncompressed_filesize = data->position;
 	}

ext/phar/tar.c

@@ -841,7 +841,7 @@ static int phar_tar_writeheaders_int(phar_entry_info *entry, void *argument) /*
 		php_stream_write(fp->new, padding, ((entry->uncompressed_filesize +511)&~511) - entry->uncompressed_filesize);
 	}
 
-	if (!entry->is_modified && entry->fp_refcount) {
+	if (entry->fp_refcount) {
 		/* open file pointers refer to this fp, do not free the stream */
 		switch (entry->fp_type) {
 			case PHAR_FP:

ext/phar/tests/gh19038.phpt

@@ -0,0 +1,25 @@
+--TEST--
+GH-19038 (Phar crash and data corruption with SplFileObject)
+--EXTENSIONS--
+phar
+--INI--
+phar.readonly=0
+--FILE--
+<?php
+
+$phar = new Phar(__DIR__ . "/gh19038.phar");
+$phar->addFromString("file", "123");
+$file = $phar["file"]->openFile();
+$file->fseek(3);
+var_dump($file->fwrite("456", 3));
+$file->fseek(0);
+echo $file->fread(100);
+
+?>
+--CLEAN--
+<?php
+@unlink(__DIR__ . "/gh19038.phar");
+?>
+--EXPECT--
+int(3)
+123456