Seekable compression demo

lib/common/error_private.c

@@ -38,6 +38,8 @@ const char* ERR_getErrorString(ERR_enum code)
     case PREFIX(dictionary_corrupted): return "Dictionary is corrupted";
     case PREFIX(dictionary_wrong): return "Dictionary mismatch";
     case PREFIX(dictionaryCreation_failed): return "Cannot create Dictionary from provided samples";
+    case PREFIX(chunkIndex_tooLarge): return "Chunk index is too large";
+    case PREFIX(needSeek): return "Wrong file position, a seek is required to continue";
     case PREFIX(maxCode):
     default: return notErrorCode;
     }

lib/common/seekable.h

@@ -0,0 +1,23 @@
+#ifndef SEEKABLE_H
+#define SEEKABLE_H
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+#include "zstd_internal.h"
+
+static const unsigned ZSTD_seekTableFooterSize = 9;
+
+#define ZSTD_SEEKABLE_MAGICNUMBER 0x8F92EAB1
+
+#define ZSTD_SEEKABLE_MAXCHUNKS 0x8000000U
+
+/* 0xFE03F607 is the largest number x such that ZSTD_compressBound(x) fits in a 32-bit integer */
+#define ZSTD_SEEKABLE_MAX_CHUNK_DECOMPRESSED_SIZE 0xFE03F607
+
+#if defined (__cplusplus)
+}
+#endif
+
+#endif

lib/common/zstd_errors.h

@@ -58,6 +58,8 @@ typedef enum {
   ZSTD_error_dictionary_corrupted,
   ZSTD_error_dictionary_wrong,
   ZSTD_error_dictionaryCreation_failed,
+  ZSTD_error_chunkIndex_tooLarge,
+  ZSTD_error_needSeek,
   ZSTD_error_maxCode
 } ZSTD_ErrorCode;