From 043495538ebaf02adba6d40764fb3e6def65cb09 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Mon, 12 Jun 2023 22:00:02 +0200
Subject: libsquashfs: Add a get_filename function to sqfs_file_t

Similar to the sqfs_istream_t & sqfs_ostream_t interfaces.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 lib/sqfs/src/unix/io_file.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

(limited to 'lib/sqfs/src/unix')

diff --git a/lib/sqfs/src/unix/io_file.c b/lib/sqfs/src/unix/io_file.c
index e1fb9db..886f752 100644
--- a/lib/sqfs/src/unix/io_file.c
+++ b/lib/sqfs/src/unix/io_file.c
@@ -9,6 +9,7 @@
 
 #include "sqfs/io.h"
 #include "sqfs/error.h"
+#include "compat.h"
 
 #include <sys/stat.h>
 #include <stdlib.h>
@@ -24,6 +25,8 @@ typedef struct {
 	bool readonly;
 	sqfs_u64 size;
 	int fd;
+
+	char name[];
 } sqfs_file_stdio_t;
 
 
@@ -39,6 +42,7 @@ static sqfs_object_t *stdio_copy(const sqfs_object_t *base)
 {
 	const sqfs_file_stdio_t *file = (const sqfs_file_stdio_t *)base;
 	sqfs_file_stdio_t *copy;
+	size_t size;
 	int err;
 
 	if (!file->readonly) {
@@ -46,11 +50,12 @@ static sqfs_object_t *stdio_copy(const sqfs_object_t *base)
 		return NULL;
 	}
 
-	copy = calloc(1, sizeof(*copy));
+	size = sizeof(*file) + strlen(file->name) + 1;
+	copy = calloc(1, size);
 	if (copy == NULL)
 		return NULL;
 
-	memcpy(copy, file, sizeof(*file));
+	memcpy(copy, file, size);
 
 	copy->fd = dup(file->fd);
 	if (copy->fd < 0) {
@@ -136,10 +141,15 @@ static int stdio_truncate(sqfs_file_t *base, sqfs_u64 size)
 	return 0;
 }
 
+static const char *stdio_get_filename(sqfs_file_t *file)
+{
+	return ((sqfs_file_stdio_t *)file)->name;
+}
 
 sqfs_file_t *sqfs_open_file(const char *filename, sqfs_u32 flags)
 {
 	sqfs_file_stdio_t *file;
+	size_t size, namelen;
 	int open_mode, temp;
 	sqfs_file_t *base;
 	struct stat sb;
@@ -149,12 +159,21 @@ sqfs_file_t *sqfs_open_file(const char *filename, sqfs_u32 flags)
 		return NULL;
 	}
 
-	file = calloc(1, sizeof(*file));
+	namelen = strlen(filename);
+	size = sizeof(*file) + 1;
+
+	if (SZ_ADD_OV(size, namelen, &size)) {
+		errno = EOVERFLOW;
+		return NULL;
+	}
+
+	file = calloc(1, size);
 	base = (sqfs_file_t *)file;
 	if (file == NULL)
 		return NULL;
 
 	sqfs_object_init(file, stdio_destroy, stdio_copy);
+	memcpy(file->name, filename, namelen);
 
 	if (flags & SQFS_FILE_OPEN_READ_ONLY) {
 		file->readonly = true;
@@ -192,5 +211,6 @@ sqfs_file_t *sqfs_open_file(const char *filename, sqfs_u32 flags)
 	base->write_at = stdio_write_at;
 	base->get_size = stdio_get_size;
 	base->truncate = stdio_truncate;
+	base->get_filename = stdio_get_filename;
 	return base;
 }
-- 
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