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-rw-r--r--src/liblzma/api/lzma/simple.h9
-rw-r--r--src/liblzma/simple/simple_coder.c8
2 files changed, 17 insertions, 0 deletions
diff --git a/src/liblzma/api/lzma/simple.h b/src/liblzma/api/lzma/simple.h
index fb78d01f..807a4c46 100644
--- a/src/liblzma/api/lzma/simple.h
+++ b/src/liblzma/api/lzma/simple.h
@@ -64,6 +64,15 @@
*
* If options with non-default values have been specified when encoding,
* the same options must also be specified when decoding.
+ *
+ * \note At the moment, none of the simple filters support
+ * LZMA_SYNC_FLUSH. If LZMA_SYNC_FLUSH is specified,
+ * LZMA_HEADER_ERROR will be returned. If there is need,
+ * partial support for LZMA_SYNC_FLUSH can be added in future.
+ * Partial means that flushing would be possible only at
+ * offsets that are multiple of 2, 4, or 16 depending on
+ * the filter, except x86 which cannot be made to support
+ * LZMA_SYNC_FLUSH predictably.
*/
typedef struct {
/**
diff --git a/src/liblzma/simple/simple_coder.c b/src/liblzma/simple/simple_coder.c
index 6ecd119e..e9674308 100644
--- a/src/liblzma/simple/simple_coder.c
+++ b/src/liblzma/simple/simple_coder.c
@@ -101,6 +101,14 @@ simple_code(lzma_coder *coder, lzma_allocator *allocator,
size_t in_size, uint8_t *restrict out,
size_t *restrict out_pos, size_t out_size, lzma_action action)
{
+ // TODO: Add partial support for LZMA_SYNC_FLUSH. We can support it
+ // in cases when the filter is able to filter everything. With most
+ // simple filters it can be done at offset that is a multiple of 2,
+ // 4, or 16. With x86 filter, it needs good luck, and thus cannot
+ // be made to work predictably.
+ if (action == LZMA_SYNC_FLUSH)
+ return LZMA_HEADER_ERROR;
+
// Flush already filtered data from coder->buffer[] to out[].
if (coder->pos < coder->filtered) {
bufcpy(coder->buffer, &coder->pos, coder->filtered,