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-rw-r--r--lib/lz4.h70
1 files changed, 68 insertions, 2 deletions
diff --git a/lib/lz4.h b/lib/lz4.h
index 724bce6..b102f58 100644
--- a/lib/lz4.h
+++ b/lib/lz4.h
@@ -39,6 +39,12 @@
extern "C" {
#endif
+/*^***************************
+* Includes
+*****************************/
+#include <stddef.h> /* size_t */
+
+
/**
Introduction
@@ -106,6 +112,56 @@ LZ4LIB_API const char* LZ4_versionString (void);
/*-************************************
+ * Private definitions
+ **************************************
+ * Do not use these definitions.
+ * They are exposed to allow static allocation of `LZ4_stream_t` and `LZ4_streamDecode_t`.
+ * If you use these definitions in your code, it will break when you upgrade LZ4 to a new version.
+**************************************/
+#define LZ4_HASHLOG (LZ4_MEMORY_USAGE-2)
+#define LZ4_HASHTABLESIZE (1 << LZ4_MEMORY_USAGE)
+#define LZ4_HASH_SIZE_U32 (1 << LZ4_HASHLOG) /* required as macro for static allocation */
+
+#if defined(__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
+#include <stdint.h>
+
+typedef struct {
+ uint32_t hashTable[LZ4_HASH_SIZE_U32];
+ uint32_t currentOffset;
+ uint32_t initCheck;
+ const uint8_t* dictionary;
+ uint8_t* bufferStart; /* obsolete, used for slideInputBuffer */
+ uint32_t dictSize;
+} LZ4_stream_t_internal;
+
+typedef struct {
+ const uint8_t* externalDict;
+ size_t extDictSize;
+ const uint8_t* prefixEnd;
+ size_t prefixSize;
+} LZ4_streamDecode_t_internal;
+
+#else
+
+typedef struct {
+ unsigned int hashTable[LZ4_HASH_SIZE_U32];
+ unsigned int currentOffset;
+ unsigned int initCheck;
+ const unsigned char* dictionary;
+ unsigned char* bufferStart; /* obsolete, used for slideInputBuffer */
+ unsigned int dictSize;
+} LZ4_stream_t_internal;
+
+typedef struct {
+ const unsigned char* externalDict;
+ size_t extDictSize;
+ const unsigned char* prefixEnd;
+ size_t prefixSize;
+} LZ4_streamDecode_t_internal;
+
+#endif
+
+/*-************************************
* Simple Functions
**************************************/
/*! LZ4_compress_default() :
@@ -229,7 +285,12 @@ LZ4LIB_API int LZ4_decompress_safe_partial (const char* source, char* dest, int
* note : only allocated directly the structure if you are statically linking LZ4
* If you are using liblz4 as a DLL, please use below construction methods instead.
*/
-typedef struct { long long table[LZ4_STREAMSIZE_U64]; } LZ4_stream_t;
+typedef struct {
+ union {
+ long long table[LZ4_STREAMSIZE_U64];
+ LZ4_stream_t_internal internal_donotuse;
+ };
+} LZ4_stream_t;
/*! LZ4_resetStream() :
* Use this function to init an allocated `LZ4_stream_t` structure
@@ -278,7 +339,12 @@ LZ4LIB_API int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int dict
#define LZ4_STREAMDECODESIZE_U64 4
#define LZ4_STREAMDECODESIZE (LZ4_STREAMDECODESIZE_U64 * sizeof(unsigned long long))
-typedef struct { unsigned long long table[LZ4_STREAMDECODESIZE_U64]; } LZ4_streamDecode_t;
+typedef struct {
+ union {
+ unsigned long long table[LZ4_STREAMDECODESIZE_U64];
+ LZ4_streamDecode_t_internal internal_donotuse;
+ };
+} LZ4_streamDecode_t;
/*!
* LZ4_streamDecode_t
* information structure to track an LZ4 stream.