Add Info-ZIP unzip.com

third_party/unzip/crc32.h

@@ -0,0 +1,65 @@
+// clang-format off
+/*
+  Copyright (c) 1990-2008 Info-ZIP.  All rights reserved.
+
+  See the accompanying file LICENSE, version 2000-Apr-09 or later
+  (the contents of which are also included in zip.h) for terms of use.
+  If, for some reason, all these files are missing, the Info-ZIP license
+  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
+*/
+/* crc32.h -- compute the CRC-32 of a data stream
+ * Copyright (C) 1995 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+#ifndef __crc32_h
+#define __crc32_h       /* identifies this source module */
+#include "third_party/unzip/unzip.h"
+#include "third_party/unzip/unzip.h"
+#include "third_party/unzip/unzpriv.h"
+#include "third_party/zip/crc32.h"
+
+/* This header should be read AFTER zip.h resp. unzip.h
+ * (the latter with UNZIP_INTERNAL defined...).
+ */
+
+#ifndef OF
+#  define OF(a) a
+#endif
+#ifndef ZCONST
+#  define ZCONST const
+#endif
+
+#ifdef DYNALLOC_CRCTAB
+   void     free_crc_table  OF((void));
+#endif
+#ifndef USE_ZLIB
+   ZCONST ulg near *get_crc_table  OF((void));
+#endif
+#if (defined(USE_ZLIB) || defined(CRC_TABLE_ONLY))
+#  ifdef IZ_CRC_BE_OPTIMIZ
+#    undef IZ_CRC_BE_OPTIMIZ
+#  endif
+#else /* !(USE_ZLIB || CRC_TABLE_ONLY) */
+   ulg      crc32           OF((ulg crc, ZCONST uch *buf, extent len));
+#endif /* ?(USE_ZLIB || CRC_TABLE_ONLY) */
+
+#ifndef CRC_32_TAB
+#  define CRC_32_TAB     crc_32_tab
+#endif
+
+#ifdef CRC32
+#  undef CRC32
+#endif
+#ifdef IZ_CRC_BE_OPTIMIZ
+#  define CRC32UPD(c, crctab) (crctab[((c) >> 24)] ^ ((c) << 8))
+#  define CRC32(c, b, crctab) (crctab[(((int)(c) >> 24) ^ (b))] ^ ((c) << 8))
+#  define REV_BE(w) (((w)>>24)+(((w)>>8)&0xff00)+ \
+                    (((w)&0xff00)<<8)+(((w)&0xff)<<24))
+#else
+#  define CRC32UPD(c, crctab) (crctab[((int)(c)) & 0xff] ^ ((c) >> 8))
+#  define CRC32(c, b, crctab) (crctab[((int)(c) ^ (b)) & 0xff] ^ ((c) >> 8))
+#  define REV_BE(w) w
+#endif
+
+#endif /* !__crc32_h */