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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-03-03 19:43:54 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-03-04 00:58:53 +0100
commit44c81eeffe9c8820b1009a7a5c728782aa5ebf40 (patch)
tree544eceb6dc5633018e5147c88ca9b07dd0fb54d9 /lib/sqfs/unix/io_file.c
parent6f47796dc0761fac359ec59ce26c7af5154e538d (diff)
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>
Diffstat (limited to 'lib/sqfs/unix/io_file.c')
-rw-r--r--lib/sqfs/unix/io_file.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/lib/sqfs/unix/io_file.c b/lib/sqfs/unix/io_file.c
index 1c181ab..52fc94b 100644
--- a/lib/sqfs/unix/io_file.c
+++ b/lib/sqfs/unix/io_file.c
@@ -13,6 +13,7 @@
#include <sys/stat.h>
#include <stdlib.h>
#include <unistd.h>
+#include <string.h>
#include <errno.h>
#include <fcntl.h>
@@ -20,6 +21,7 @@
typedef struct {
sqfs_file_t base;
+ bool readonly;
sqfs_u64 size;
int fd;
} sqfs_file_stdio_t;
@@ -33,6 +35,34 @@ 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;
+ int err;
+
+ if (!file->readonly) {
+ errno = ENOTSUP;
+ return NULL;
+ }
+
+ copy = calloc(1, sizeof(*copy));
+ if (copy == NULL)
+ return NULL;
+
+ memcpy(copy, file, sizeof(*file));
+
+ copy->fd = dup(file->fd);
+ if (copy->fd < 0) {
+ err = errno;
+ free(copy);
+ copy = NULL;
+ errno = err;
+ }
+
+ return (sqfs_object_t *)copy;
+}
+
static int stdio_read_at(sqfs_file_t *base, sqfs_u64 offset,
void *buffer, size_t size)
{
@@ -125,8 +155,10 @@ sqfs_file_t *sqfs_open_file(const char *filename, sqfs_u32 flags)
return NULL;
if (flags & SQFS_FILE_OPEN_READ_ONLY) {
+ file->readonly = true;
open_mode = O_RDONLY;
} else {
+ file->readonly = false;
open_mode = O_CREAT | O_RDWR;
if (flags & SQFS_FILE_OPEN_OVERWRITE) {
@@ -158,6 +190,7 @@ 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;
+ ((sqfs_object_t *)base)->copy = stdio_copy;
((sqfs_object_t *)base)->destroy = stdio_destroy;
return base;
}