Add an unpatched version of xz, XZ Utils, to /trunk/deps/third_party

xz/src/liblzma/check/check.h

+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       check.h
+/// \brief      Internal API to different integrity check functions
+//
+//  Author:     Lasse Collin
+//
+//  This file has been put into the public domain.
+//  You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_CHECK_H
+#define LZMA_CHECK_H
+
+#include "common.h"
+
+
+// Index hashing needs the best possible hash function (preferably
+// a cryptographic hash) for maximum reliability.
+#if defined(HAVE_CHECK_SHA256)
+#       define LZMA_CHECK_BEST LZMA_CHECK_SHA256
+#elif defined(HAVE_CHECK_CRC64)
+#       define LZMA_CHECK_BEST LZMA_CHECK_CRC64
+#else
+#       define LZMA_CHECK_BEST LZMA_CHECK_CRC32
+#endif
+
+
+/// \brief      Structure to hold internal state of the check being calculated
+///
+/// \note       This is not in the public API because this structure may
+///             change in future if new integrity check algorithms are added.
+typedef struct {
+        /// Buffer to hold the final result and a temporary buffer for SHA256.
+        union {
+                uint8_t u8[64];
+                uint32_t u32[16];
+                uint64_t u64[8];
+        } buffer;
+
+        /// Check-specific data
+        union {
+                uint32_t crc32;
+                uint64_t crc64;
+
+                struct {
+                        /// Internal state
+                        uint32_t state[8];
+
+                        /// Size of the message excluding padding
+                        uint64_t size;
+                } sha256;
+        } state;
+
+} lzma_check_state;
+
+
+/// lzma_crc32_table[0] is needed by LZ encoder so we need to keep
+/// the array two-dimensional.
+#ifdef HAVE_SMALL
+extern uint32_t lzma_crc32_table[1][256];
+extern void lzma_crc32_init(void);
+#else
+extern const uint32_t lzma_crc32_table[8][256];
+extern const uint64_t lzma_crc64_table[4][256];
+#endif
+
+
+/// \brief      Initialize *check depending on type
+///
+/// \return     LZMA_OK on success. LZMA_UNSUPPORTED_CHECK if the type is not
+///             supported by the current version or build of liblzma.
+///             LZMA_PROG_ERROR if type > LZMA_CHECK_ID_MAX.
+extern void lzma_check_init(lzma_check_state *check, lzma_check type);
+
+/// Update the check state
+extern void lzma_check_update(lzma_check_state *check, lzma_check type,
+                const uint8_t *buf, size_t size);
+
+/// Finish the check calculation and store the result to check->buffer.u8.
+extern void lzma_check_finish(lzma_check_state *check, lzma_check type);
+
+
+/// Prepare SHA-256 state for new input.
+extern void lzma_sha256_init(lzma_check_state *check);
+
+/// Update the SHA-256 hash state
+extern void lzma_sha256_update(
+                const uint8_t *buf, size_t size, lzma_check_state *check);
+
+/// Finish the SHA-256 calculation and store the result to check->buffer.u8.
+extern void lzma_sha256_finish(lzma_check_state *check);
+
+#endif