Merge 8041eb3ef0 into 82d470564d

prevent possible segfault when creating seek table

contrib/seekable_format/zstdseek_decompress.c

@@ -252,6 +252,8 @@ size_t ZSTD_seekable_free(ZSTD_seekable* zs)
 
 ZSTD_seekTable* ZSTD_seekTable_create_fromSeekable(const ZSTD_seekable* zs)
 {
+    assert(zs != NULL);
+    if (zs->seekTable.entries == NULL) return NULL;
     ZSTD_seekTable* const st = (ZSTD_seekTable*)malloc(sizeof(ZSTD_seekTable));
     if (st==NULL) return NULL;
 

doc/zstd_compression_format.md

@@ -1120,7 +1120,7 @@ For the purpose of counting total allocated probability points, it counts as one
 
 Symbols probabilities are read one by one, in order.
 After each probability is decoded, the total nb of probability points is updated.
-This is used to dermine how many bits must be read to decode the probability of next symbol.
+This is used to determine how many bits must be read to decode the probability of next symbol.
 
 When a symbol has a __probability__ of `zero` (decoded from reading a Value `1`),
 it is followed by a 2-bits repeat flag.

lib/compress/hist.h

@@ -75,7 +75,7 @@ unsigned HIST_count_simple(unsigned* count, unsigned* maxSymbolValuePtr,
                            const void* src, size_t srcSize);
 
 /*! HIST_add() :
- *  Lowest level: just add nb of occurences of characters from @src into @count.
+ *  Lowest level: just add nb of occurrences of characters from @src into @count.
  *  @count is not reset. @count array is presumed large enough (i.e. 1 KB).
  @  This function does not need any additional stack memory.
  */

lib/decompress/huf_decompress.c

@@ -153,7 +153,7 @@ static size_t HUF_initFastDStream(BYTE const* ip) {
     size_t const value = MEM_readLEST(ip) | 1;
     assert(bitsConsumed <= 8);
     assert(sizeof(size_t) == 8);
-    return value << bitsConsumed;
+    return (value << bitsConsumed) | (ip[bitsConsumed >> 3] >> (8 - (bitsConsumed & 7)));
 }
 
 

lib/zstd.h

@@ -224,7 +224,7 @@ ZSTDLIB_API size_t ZSTD_findFrameCompressedSize(const void* src, size_t srcSize)
  * it's recommended to provide @dstCapacity >= ZSTD_compressBound(srcSize)
  * as it eliminates one potential failure scenario,
  * aka not enough room in dst buffer to write the compressed frame.
- * Note : ZSTD_compressBound() itself can fail, if @srcSize > ZSTD_MAX_INPUT_SIZE .
+ * Note : ZSTD_compressBound() itself can fail, if @srcSize >= ZSTD_MAX_INPUT_SIZE .
  *        In which case, ZSTD_compressBound() will return an error code
  *        which can be tested using ZSTD_isError().
  *

programs/zstdcli.c

@@ -696,7 +696,7 @@ static void printDefaultCParams(const char* filename, const char* dictFileName,
     unsigned long long fileSize = UTIL_getFileSize(filename);
     const size_t dictSize = dictFileName != NULL ? (size_t)UTIL_getFileSize(dictFileName) : 0;
     const ZSTD_compressionParameters cParams = ZSTD_getCParams(cLevel, fileSize, dictSize);
-    if (fileSize != UTIL_FILESIZE_UNKNOWN) DISPLAY("%s (%u bytes)\n", filename, (unsigned)fileSize);
+    if (fileSize != UTIL_FILESIZE_UNKNOWN) DISPLAY("%s (%llu bytes)\n", filename, fileSize);
     else DISPLAY("%s (src size unknown)\n", filename);
     DISPLAY(" - windowLog     : %u\n", cParams.windowLog);
     DISPLAY(" - chainLog      : %u\n", cParams.chainLog);