Revised the Delta filter implementation. The initialization

function is still shared between encoder and decoder, but the
actual coding is in separate files for encoder and decoder.

There are now separate functions for the actual delta
calculation depending on if Delta is the last filter in the
chain or not. If it is the last, the new code copies the
data from input to output buffer and does the delta
calculation at the same time. The old code first copied the
data, then did the delta in the target buffer, which required
reading through the data twice.

Support for LZMA_SYNC_FLUSH was added to the Delta encoder.
This doesn't change anything in the file format.

1 files changed, 12 insertions, 2 deletions

diff --git a/src/liblzma/common/Makefile.am b/src/liblzma/common/Makefile.am
index a2eacfd8..048f4c73 100644
--- a/src/liblzma/common/Makefile.am
+++ b/src/liblzma/common/Makefile.am
@@ -48,8 +48,18 @@ endif
 
 if COND_FILTER_DELTA
 libcommon_la_SOURCES += \
-	delta_coder.c \
-	delta_coder.h
+	delta_common.c \
+	delta_common.h
+if COND_MAIN_ENCODER
+libcommon_la_SOURCES += \
+	delta_encoder.c \
+	delta_encoder.h
+endif
+if COND_MAIN_DECODER
+libcommon_la_SOURCES += \
+	delta_decoder.c \
+	delta_decoder.h
+endif
 endif
 
 if COND_MAIN_ENCODER