1 files changed, 35 insertions, 7 deletions

diff --git a/src/xz/coder.h b/src/xz/coder.h
index b4f43a2..96755f3 100644
--- a/src/xz/coder.h
+++ b/src/xz/coder.h
@@ -1,12 +1,12 @@
+// SPDX-License-Identifier: 0BSD
+
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       coder.h
 /// \brief      Compresses or uncompresses a file
 //
-//  Author:     Lasse Collin
-//
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
+//  Authors:    Lasse Collin
+//              Jia Tan
 //
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -30,6 +30,16 @@ enum format_type {
 };
 
 
+/// Array of these hold the entries specified with --block-list.
+typedef struct {
+	/// Uncompressed size of the Block
+	uint64_t size;
+
+	/// Filter chain to use for this Block (chains[chain_num])
+	unsigned chain_num;
+} block_list_entry;
+
+
 /// Operation mode of the command line tool. This is set in args.c and read
 /// in several files.
 extern enum operation_mode opt_mode;
@@ -50,9 +60,21 @@ extern bool opt_single_stream;
 /// of input. This has an effect only when compressing to the .xz format.
 extern uint64_t opt_block_size;
 
-/// This is non-NULL if --block-list was used. This contains the Block sizes
-/// as an array that is terminated with 0.
-extern uint64_t *opt_block_list;
+/// List of block size and filter chain pointer pairs.
+extern block_list_entry *opt_block_list;
+
+/// Size of the largest Block that was specified in --block-list.
+/// This is used to limit the block_size option of multithreaded encoder.
+/// It's waste of memory to specify a too large block_size and reducing
+/// it might even allow using more threads in some cases.
+///
+/// NOTE: If the last entry in --block-list is the special value of 0
+/// (which gets converted to UINT64_MAX), it counts here as UINT64_MAX too.
+/// This way the multithreaded encoder's Block size won't be reduced.
+extern uint64_t block_list_largest;
+
+/// Bitmask indicating which filter chains we specified in --block-list.
+extern uint32_t block_list_chain_mask;
 
 /// Set the integrity check type used when compressing
 extern void coder_set_check(lzma_check check);
@@ -77,3 +99,9 @@ extern void coder_run(const char *filename);
 /// Free the memory allocated for the coder and kill the worker threads.
 extern void coder_free(void);
 #endif
+
+/// Create filter chain from string
+extern void coder_add_filters_from_str(const char *filter_str);
+
+/// Add or overwrite a filter that can be used by the block-list.
+extern void coder_add_block_filters(const char *str, size_t slot);