Merge branch 'null-buffer-decompress' of github.com:daniellerozenblit/zstd into null-buffer-decompress

lib/compress/zstd_compress.c

@@ -3003,6 +3003,10 @@ static void ZSTD_copyBlockSequences(ZSTD_CCtx* zc)
     zc->seqCollector.seqIndex += seqStoreSeqSize;
 }
 
+size_t ZSTD_sequenceBound(size_t srcSize) {
+    return (srcSize / ZSTD_MINMATCH_MIN) + 1;
+}
+
 size_t ZSTD_generateSequences(ZSTD_CCtx* zc, ZSTD_Sequence* outSeqs,
                               size_t outSeqsSize, const void* src, size_t srcSize)
 {

lib/zstd.h

@@ -836,7 +836,7 @@ ZSTDLIB_API size_t ZSTD_initDStream(ZSTD_DStream* zds);
 /*! ZSTD_decompressStream() :
  * Streaming decompression function.
  * Call repetitively to consume full input updating it as necessary.
- * Funtion will update both input and output `pos` fields exposing current state via these fields:
+ * Function will update both input and output `pos` fields exposing current state via these fields:
  * - `input.pos < input.size`, some input remaining and caller should provide remaining input
  *   on the next call.
  * - `output.pos < output.size`, decoder finished and flushed all remaining buffers.
@@ -844,7 +844,7 @@ ZSTDLIB_API size_t ZSTD_initDStream(ZSTD_DStream* zds);
  *   call ZSTD_decompressStream() again to flush remaining data to output.
  * Note : with no additional input, amount of data flushed <= ZSTD_BLOCKSIZE_MAX.
  *
- * @return : 0 when a frame is completly decoded and fully flushed,
+ * @return : 0 when a frame is completely decoded and fully flushed,
  *           or an error code, which can be tested using ZSTD_isError(),
  *           or any other value > 0, which means there is some decoding or flushing to do to complete current frame.
  */
@@ -1396,6 +1396,15 @@ typedef enum {
   ZSTD_sf_explicitBlockDelimiters = 1    /* Representation of ZSTD_Sequence contains explicit block delimiters */
 } ZSTD_sequenceFormat_e;
 
+/*! ZSTD_sequenceBound() :
+ * `srcSize` : size of the input buffer
+ *  @return : upper-bound for the number of sequences that can be generated
+ *            from a buffer of srcSize bytes
+ *
+ *  note : returns number of sequences - to get bytes, multiply by sizeof(ZSTD_Sequence).
+ */
+ZSTDLIB_STATIC_API size_t ZSTD_sequenceBound(size_t srcSize);
+
 /*! ZSTD_generateSequences() :
  * Generate sequences using ZSTD_compress2(), given a source buffer.
  *