integrate lzma

[zpackage] / lzma / api / lzma / delta.h

diff --git a/lzma/api/lzma/delta.h b/lzma/api/lzma/delta.h
new file mode 100644 (file)
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--- /dev/null
+++ b/lzma/api/lzma/delta.h
@@ -0,0 +1,77 @@
+/**
+ * \file        lzma/delta.h
+ * \brief       Delta filter
+ */
+
+/*
+ * Author: Lasse Collin
+ *
+ * This file has been put into the public domain.
+ * You can do whatever you want with this file.
+ *
+ * See ../lzma.h for information about liblzma as a whole.
+ */
+
+#ifndef LZMA_H_INTERNAL
+#      error Never include this file directly. Use <lzma.h> instead.
+#endif
+
+
+/**
+ * \brief       Filter ID
+ *
+ * Filter ID of the Delta filter. This is used as lzma_filter.id.
+ */
+#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;
+
+
+/**
+ * \brief       Options for the Delta filter
+ *
+ * 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
+        *
+        * With the only currently supported type, LZMA_DELTA_TYPE_BYTE,
+        * the distance is as bytes.
+        *
+        * Examples:
+        *  - 16-bit stereo audio: distance = 4 bytes
+        *  - 24-bit RGB image data: distance = 3 bytes
+        */
+       uint32_t dist;
+#      define LZMA_DELTA_DIST_MIN 1
+#      define LZMA_DELTA_DIST_MAX 256
+
+       /*
+        * Reserved space to allow possible future extensions without
+        * breaking the ABI. 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;
+       uint32_t reserved_int3;
+       uint32_t reserved_int4;
+       void *reserved_ptr1;
+       void *reserved_ptr2;
+
+} lzma_options_delta;