From 44c81eeffe9c8820b1009a7a5c728782aa5ebf40 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Tue, 3 Mar 2020 19:43:54 +0100
Subject: Add a generic copying mechanism to sqfs_object_t
This patch adds a deep-copy callback to sqfs_object_t and removes the
copying mechanism from sqfs_compressor_t. This is also interesting for
other types.
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
lib/sqfs/win32/io_file.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
(limited to 'lib/sqfs/win32')
diff --git a/lib/sqfs/win32/io_file.c b/lib/sqfs/win32/io_file.c
index c1849a8..836aa37 100644
--- a/lib/sqfs/win32/io_file.c
+++ b/lib/sqfs/win32/io_file.c
@@ -19,6 +19,7 @@
typedef struct {
sqfs_file_t base;
+ bool readonly;
sqfs_u64 size;
HANDLE fd;
} sqfs_file_stdio_t;
@@ -32,6 +33,35 @@ static void stdio_destroy(sqfs_object_t *base)
free(file);
}
+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;
+ BOOL ret;
+
+ if (!file->readonly) {
+ SetLastError(ERROR_NOT_SUPPORTED);
+ return NULL;
+ }
+
+ copy = calloc(1, sizeof(*copy));
+ if (copy == NULL)
+ return NULL;
+
+ memcpy(copy, file, sizeof(*file));
+
+ ret = DuplicateHandle(GetCurrentProcess(), file->fd,
+ GetCurrentProcess(), ©->fd,
+ 0, FALSE, DUPLICATE_SAME_ACCESS);
+
+ if (!ret) {
+ free(copy);
+ return NULL;
+ }
+
+ return (sqfs_object_t *)copy;
+}
+
static int stdio_read_at(sqfs_file_t *base, sqfs_u64 offset,
void *buffer, size_t size)
{
@@ -135,9 +165,11 @@ sqfs_file_t *sqfs_open_file(const char *filename, sqfs_u32 flags)
return NULL;
if (flags & SQFS_FILE_OPEN_READ_ONLY) {
+ file->readonly = true;
access_flags = GENERIC_READ;
creation_mode = OPEN_EXISTING;
} else {
+ file->readonly = false;
access_flags = GENERIC_READ | GENERIC_WRITE;
if (flags & SQFS_FILE_OPEN_OVERWRITE) {
@@ -166,5 +198,6 @@ sqfs_file_t *sqfs_open_file(const char *filename, sqfs_u32 flags)
base->get_size = stdio_get_size;
base->truncate = stdio_truncate;
((sqfs_object_t *)base)->destroy = stdio_destroy;
+ ((sqfs_object_t *)base)->copy = stdio_copy;
return base;
}
--
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