integrate lzma

[zpackage] / lzma / common / index.h

diff --git a/lzma/common/index.h b/lzma/common/index.h
new file mode 100644 (file)
index 0000000..64e9724
--- /dev/null
+++ b/lzma/common/index.h
@@ -0,0 +1,73 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       index.h
+/// \brief      Handling of Index
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_INDEX_H
+#define LZMA_INDEX_H
+
+#include "common.h"
+
+
+/// Minimum Unpadded Size
+#define UNPADDED_SIZE_MIN LZMA_VLI_C(5)
+
+/// Maximum Unpadded Size
+#define UNPADDED_SIZE_MAX (LZMA_VLI_MAX & ~LZMA_VLI_C(3))
+
+
+/// Get the size of the Index Padding field. This is needed by Index encoder
+/// and decoder, but applications should have no use for this.
+extern uint32_t lzma_index_padding_size(const lzma_index *i);
+
+
+/// Set for how many Records to allocate memory the next time
+/// lzma_index_append() needs to allocate space for a new Record.
+/// This is used only by the Index decoder.
+extern void lzma_index_prealloc(lzma_index *i, lzma_vli records);
+
+
+/// Round the variable-length integer to the next multiple of four.
+static inline lzma_vli
+vli_ceil4(lzma_vli vli)
+{
+       assert(vli <= LZMA_VLI_MAX);
+       return (vli + 3) & ~LZMA_VLI_C(3);
+}
+
+
+/// Calculate the size of the Index field excluding Index Padding
+static inline lzma_vli
+index_size_unpadded(lzma_vli count, lzma_vli index_list_size)
+{
+       // Index Indicator + Number of Records + List of Records + CRC32
+       return 1 + lzma_vli_size(count) + index_list_size + 4;
+}
+
+
+/// Calculate the size of the Index field including Index Padding
+static inline lzma_vli
+index_size(lzma_vli count, lzma_vli index_list_size)
+{
+       return vli_ceil4(index_size_unpadded(count, index_list_size));
+}
+
+
+/// Calculate the total size of the Stream
+static inline lzma_vli
+index_stream_size(lzma_vli blocks_size,
+               lzma_vli count, lzma_vli index_list_size)
+{
+       return LZMA_STREAM_HEADER_SIZE + blocks_size
+                       + index_size(count, index_list_size)
+                       + LZMA_STREAM_HEADER_SIZE;
+}
+
+#endif