Sort of garbage collection commit. :-| Many things are still

broken. API has changed a lot and it will still change a
little more here and there. The command line tool doesn't
have all the required changes to reflect the API changes, so
it's easy to get "internal error" or trigger assertions.

1 files changed, 33 insertions, 3 deletions

diff --git a/src/liblzma/api/lzma/delta.h b/src/liblzma/api/lzma/delta.h
index 58afec18..740de97c 100644
--- a/src/liblzma/api/lzma/delta.h
+++ b/src/liblzma/api/lzma/delta.h
@@ -24,9 +24,21 @@
 /**
  * \brief       Filter ID
  *
- * Filter ID of the Delta filter. This is used as lzma_options_filter.id.
+ * Filter ID of the Delta filter. This is used as lzma_filter.id.
  */
-#define LZMA_FILTER_DELTA       LZMA_VLI_C(0x20)
+#define LZMA_FILTER_DELTA       LZMA_VLI_C(0x03)
+
+
+/**
+ * \brief       Type of the delta calculation
+ *
+ * Currently only byte-wise delta is supported. Other possible types could
+ * be, for example, delta of 16/32/64-bit little/big endian integers, but
+ * these are not currently planned since byte-wise delta is almost as good.
+ */
+typedef enum {
+	LZMA_DELTA_TYPE_BYTE
+} lzma_delta_type;
 
 
 /**
@@ -35,8 +47,14 @@
  * These options are needed by both encoder and decoder.
  */
 typedef struct {
+	/** For now, this must always be LZMA_DELTA_TYPE_BYTE. */
+	lzma_delta_type type;
+
 	/**
-	 * \brief       Delta distance as bytes
+	 * \brief       Delta distance
+	 *
+	 * With the only currently supported type, LZMA_DELTA_TYPE_BYTE,
+	 * the distance is as bytes.
 	 *
 	 * Examples:
 	 *  - 16-bit stereo audio: distance = 4 bytes
@@ -46,4 +64,16 @@ typedef struct {
 #	define LZMA_DELTA_DISTANCE_MIN 1
 #	define LZMA_DELTA_DISTANCE_MAX 256
 
+	/**
+	 * \brief       Reserved space for possible future extensions
+	 *
+	 * You should not touch these, because the names of these variables
+	 * may change. These are and will never be used when type is
+	 * LZMA_DELTA_TYPE_BYTE, so it is safe to leave these uninitialized.
+	 */
+	uint32_t reserved_int1;
+	uint32_t reserved_int2;
+	void *reserved_ptr1;
+	void *reserved_ptr2;
+
 } lzma_options_delta;