Revised the Index handling code.

This breaks API and ABI but most apps are not affected
since most apps don't use this part of the API. You will
get a compile error if you are using anything that got
broken.

Summary of changes:

  - Ability to store Stream Flags, which are needed
    for random-access reading in multi-Stream files.

  - Separate function to set size of Stream Padding.

  - Iterator structure makes it possible to read the same
    lzma_index from multiple threads at the same time.

  - A lot faster code to locate Blocks.

  - Removed lzma_index_equal() without adding anything
    to replace it. I don't know what it should do exactly
    with the new features and what actually needs this
    function in the first place other than test_index.c,
    which now has its own code to compare lzma_indexes.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/liblzma/common/index.h b/src/liblzma/common/index.h
index 9f177b1b..64e97247 100644
--- a/src/liblzma/common/index.h
+++ b/src/liblzma/common/index.h
@@ -28,6 +28,12 @@
 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)