libupkg: Parameterise I/O functions to allow custom streams.

[upkg.git] / src / upkg.h

diff --git a/src/upkg.h b/src/upkg.h
index 7565b3244d8b4f01a6c5cea264026238aaf9e720..9fc80034af962ba894533d421f2166636ec2e50e 100644 (file)
--- a/src/upkg.h
+++ b/src/upkg.h
@@ -62,6 +62,13 @@
 #define UPKG_HDR_MAGIC 0x9e2a83c1
 #define UPKG_HDR_SIZE  36
 
+struct upkg_file_ops {
+       size_t (*read)(void *buf, size_t size, void *handle);
+       int    (*seek)(void *handle, long offset, int whence);
+       long   (*tell)(void *handle);
+       int    (*eof) (void *handle);
+};
+
 struct upkg {
        unsigned version, license;
        unsigned char guid[16];
@@ -81,6 +88,10 @@ struct upkg_file {
        unsigned long base, offset, len;
 };
 
+/* Default I/O operations for ordinary files. */
+extern const struct upkg_file_ops upkg_default_fops;
+
+struct upkg *upkg_open(void *handle, const struct upkg_file_ops *fops);
 struct upkg *upkg_fopen(const char *path);
 int upkg_close(struct upkg *pkg);