1 files changed, 79 insertions, 0 deletions
diff --git a/squashfs-tools/unsquash-123.c b/squashfs-tools/unsquash-123.c
new file mode 100644
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+++ b/squashfs-tools/unsquash-123.c
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+/*
+ * Unsquash a squashfs filesystem.  This is a highly compressed read only
+ * filesystem.
+ *
+ * Copyright (c) 2019
+ * Phillip Lougher <phillip@squashfs.org.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2,
+ * or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * unsquash-123.c
+ *
+ * Helper functions used by unsquash-1, unsquash-2 and unsquash-3.
+ */
+
+#include "unsquashfs.h"
+#include "squashfs_compat.h"
+
+int read_ids(int ids, long long start, long long end, unsigned int **id_table)
+{
+	/* Note on overflow limits:
+	 * Size of ids is 2^8
+	 * Max length is 2^8*4 or 1024
+	 */
+	int res;
+	int length = ids * sizeof(unsigned int);
+
+	/*
+	 * The size of the index table (length bytes) should match the
+	 * table start and end points
+	 */
+	if(length != (end - start)) {
+		ERROR("read_ids: Bad inode count in super block\n");
+		return FALSE;
+	}
+
+	TRACE("read_ids: no_ids %d\n", ids);
+
+	*id_table = malloc(length);
+	if(*id_table == NULL)
+		MEM_ERROR();
+
+	if(swap) {
+		unsigned int *sid_table = malloc(length);
+
+		if(sid_table == NULL)
+			MEM_ERROR();
+
+		res = read_fs_bytes(fd, start, length, sid_table);
+		if(res == FALSE) {
+			ERROR("read_ids: failed to read uid/gid table"
+				"\n");
+			free(sid_table);
+			return FALSE;
+		}
+		SQUASHFS_SWAP_INTS_3((*id_table), sid_table, ids);
+		free(sid_table);
+	} else {
+		res = read_fs_bytes(fd, start, length, *id_table);
+		if(res == FALSE) {
+			ERROR("read_ids: failed to read uid/gid table"
+				"\n");
+			return FALSE;
+		}
+	}
+
+	return TRUE;
+}