Add Info-ZIP unzip.com

third_party/unzip/crypt.h

@@ -0,0 +1,171 @@
+// clang-format off
+/*
+  Copyright (c) 1990-2007 Info-ZIP.  All rights reserved.
+
+  See the accompanying file LICENSE, version 2005-Feb-10 or later
+  (the contents of which are also included in (un)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
+*/
+/*
+  crypt.h (full version) by Info-ZIP.   Last revised:  [see CR_VERSION_DATE]
+
+  The main encryption/decryption source code for Info-Zip software was
+  originally written in Europe.  To the best of our knowledge, it can
+  be freely distributed in both source and object forms from any country,
+  including the USA under License Exception TSU of the U.S. Export
+  Administration Regulations (section 740.13(e)) of 6 June 2002.
+
+  NOTE on copyright history:
+  Previous versions of this source package (up to version 2.8) were
+  not copyrighted and put in the public domain.  If you cannot comply
+  with the Info-Zip LICENSE, you may want to look for one of those
+  public domain versions.
+ */
+
+#ifndef __crypt_h   /* don't include more than once */
+#define __crypt_h
+#include "third_party/unzip/crc32.h"
+
+#ifdef CRYPT
+#  undef CRYPT
+#endif
+/*
+   Logic of selecting "full crypt" code:
+   a) default behaviour:
+      - dummy crypt code when compiling UnZipSFX stub, to minimize size
+      - full crypt code when used to compile Zip, UnZip and fUnZip
+   b) USE_CRYPT defined:
+      - always full crypt code
+   c) NO_CRYPT defined:
+      - never full crypt code
+   NO_CRYPT takes precedence over USE_CRYPT
+ */
+#if defined(NO_CRYPT)
+#  define CRYPT  0  /* dummy version */
+#else
+#if defined(USE_CRYPT)
+#  define CRYPT  1  /* full version */
+#else
+#if !defined(SFX)
+#  define CRYPT  1  /* full version for zip and main unzip */
+#else
+#  define CRYPT  0  /* dummy version for unzip sfx */
+#endif
+#endif /* ?USE_CRYPT */
+#endif /* ?NO_CRYPT */
+
+#if CRYPT
+/* full version */
+
+#ifdef CR_BETA
+#  undef CR_BETA    /* this is not a beta release */
+#endif
+
+#define CR_MAJORVER        2
+#define CR_MINORVER        11
+#ifdef CR_BETA
+#  define CR_BETA_VER      "c BETA"
+#  define CR_VERSION_DATE  "05 Jan 2007"       /* last real code change */
+#else
+#  define CR_BETA_VER      ""
+#  define CR_VERSION_DATE  "05 Jan 2007"       /* last public release date */
+#  define CR_RELEASE
+#endif
+
+#ifndef __G         /* UnZip only, for now (DLL stuff) */
+#  define __G
+#  define __G__
+#  define __GDEF
+#  define __GPRO    void
+#  define __GPRO__
+#endif
+
+#if defined(MSDOS) || defined(OS2) || defined(WIN32)
+#  ifndef DOS_OS2_W32
+#    define DOS_OS2_W32
+#  endif
+#endif
+
+#if defined(DOS_OS2_W32) || defined(__human68k__)
+#  ifndef DOS_H68_OS2_W32
+#    define DOS_H68_OS2_W32
+#  endif
+#endif
+
+#if defined(VM_CMS) || defined(MVS)
+#  ifndef CMS_MVS
+#    define CMS_MVS
+#  endif
+#endif
+
+/* To allow combining of Zip and UnZip static libraries in a single binary,
+ * the Zip and UnZip versions of the crypt core functions have to be named
+ * differently.
+ */
+#ifdef ZIP
+#  ifdef REALLY_SHORT_SYMS
+#    define decrypt_byte   zdcrby
+#  else
+#    define decrypt_byte   zp_decrypt_byte
+#  endif
+#  define  update_keys     zp_update_keys
+#  define  init_keys       zp_init_keys
+#else /* !ZIP */
+#  ifdef REALLY_SHORT_SYMS
+#    define decrypt_byte   dcrbyt
+#  endif
+#endif /* ?ZIP */
+
+#define IZ_PWLEN  80    /* input buffer size for reading encryption key */
+#ifndef PWLEN           /* for compatibility with previous zcrypt release... */
+#  define PWLEN IZ_PWLEN
+#endif
+#define RAND_HEAD_LEN  12       /* length of encryption random header */
+
+/* the crc_32_tab array has to be provided externally for the crypt calculus */
+
+/* encode byte c, using temp t.  Warning: c must not have side effects. */
+#define zencode(c,t)  (t=decrypt_byte(__G), update_keys(c), t^(c))
+
+/* decode byte c in place */
+#define zdecode(c)   update_keys(__G__ c ^= decrypt_byte(__G))
+
+int  decrypt_byte OF((__GPRO));
+int  update_keys OF((__GPRO__ int c));
+void init_keys OF((__GPRO__ ZCONST char *passwd));
+
+#ifdef ZIP
+   void crypthead OF((ZCONST char *, ulg, FILE *));
+#  ifdef UTIL
+     int zipcloak OF((struct zlist far *, FILE *, FILE *, ZCONST char *));
+     int zipbare OF((struct zlist far *, FILE *, FILE *, ZCONST char *));
+#  else
+     unsigned zfwrite OF((zvoid *, extent, extent, FILE *));
+     extern char *key;
+#  endif
+#endif /* ZIP */
+
+#if (defined(UNZIP) && !defined(FUNZIP))
+   int  decrypt OF((__GPRO__ ZCONST char *passwrd));
+#endif
+
+#ifdef FUNZIP
+   extern int encrypted;
+#  ifdef NEXTBYTE
+#    undef NEXTBYTE
+#  endif
+#  define NEXTBYTE \
+   (encrypted? update_keys(__G__ getc(G.in)^decrypt_byte(__G)) : getc(G.in))
+#endif /* FUNZIP */
+
+#else /* !CRYPT */
+/* dummy version */
+
+#define zencode
+#define zdecode
+
+#define zfwrite  fwrite
+
+#endif /* ?CRYPT */
+#endif /* !__crypt_h */