Add CMake support

Adds CMake tooling for libmspack to the project.
This attempts to replicate every feature available in the autotools
tooling and includes support for building on Windows.

Adds a mspack-version.h header file, generated from mspack-version.h.in.
mspack-version.h is to be installed alongside mspack.h so that application
developers can use the version numbers and strings in the event that the API
is modified and the application must maintain backwards compatibility.

Adds error handling to autogen.sh.

Reformats libmspack's README as Markdown.

Adds mspack_error_msg() and MSPACK_ERROR() macro to mspack.h API.
The new API is a cross between the cab_error() function previously found
in cabextract and error_msg() found in test/error.h.  This removes the
need the examples to depend on test/error.h, a header not exported by
any build target, and removes the code duplication with cabextract.

Fixes __func__ macro for Windows.

cabextract/autogen.sh

@@ -2,4 +2,8 @@
 # Runs the autoreconf tool, creating the configure script
 
 autoreconf -i -W all
-echo you can now run ./configure
+rc=$?; if [[ $rc != 0 ]]; then
+  echo "Error: Failed to generate autojunk!"; exit $rc
+else
+  echo "You can now run ./configure"
+fi

cabextract/getopt.c

@@ -28,7 +28,7 @@
 #endif
 
 #ifdef HAVE_CONFIG_H
-# include <config.h>
+# include "config.h"
 #endif
 
 #if !defined __STDC__ || !__STDC__

cabextract/getopt1.c

@@ -19,7 +19,7 @@
    Boston, MA 02111-1307, USA.  */
 
 #ifdef HAVE_CONFIG_H
-#include <config.h>
+#include "config.h"
 #endif
 
 #include "getopt.h"

cabextract/md5.c

@@ -21,14 +21,14 @@
 /* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.  */
 
 #ifdef HAVE_CONFIG_H
-# include <config.h>
+# include "config.h"
 #endif
 
 #include <sys/types.h>
 #include <stdlib.h>
 #include <string.h>
 
-#include <md5.h>
+#include "md5.h"
 
 #ifdef _LIBC
 # include <endian.h>

cabextract/src/cabextract.c

@@ -23,7 +23,7 @@
 #define _GNU_SOURCE 1
 
 #if HAVE_CONFIG_H
-# include <config.h>
+# include "config.h"
 #endif
 
 #include <sys/types.h>
@@ -76,8 +76,12 @@
 
 #include "getopt.h"
 
-#include <mspack.h>
-#include <md5.h>
+#include "mspack.h"
+#include "md5.h"
+
+#if !defined(S_ISDIR)
+# define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
+#endif
 
 /* structures and global variables */
 struct option optlist[] = {
@@ -184,7 +188,6 @@ static void forget_files(struct file_mem **fml);
 static void add_filter(char *arg);
 static void free_filters();
 static int ensure_filepath(char *path);
-static char *cab_error(struct mscab_decompressor *cd);
 
 static struct mspack_file *cabx_open(struct mspack_system *this,
                                      const char *filename, int mode);

cabextract/src/cabinfo.c

@@ -17,7 +17,7 @@
  */
 
 #ifdef HAVE_CONFIG_H
-# include <config.h>
+# include "config.h"
 #endif
 #include <stdio.h>
 #include <stdlib.h>

libmspack/.gitignore

@@ -1,22 +1,100 @@
+# Logs
+*.log
+
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# CMake
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+
+# http://www.gnu.org/software/automake
+.deps
+.dirstamp
 .libs
-INSTALL
-/Makefile
 Makefile.in
-aclocal.m4
-ar-lib
+/ar-lib
+/mdate-sh
+/py-compile
+/test-driver
+/ylwrap
+
+# http://www.gnu.org/software/autoconf
 autom4te.cache
-compile
-config.*
-configure
-depcomp
-install-sh
-lib*.la
-libmspack-*.tar.gz
-libmspack.pc
-libtool
-ltmain.sh
-m4
-missing
-stamp-h1
-test-driver
-test-suite.log
+/autoscan.log
+/autoscan-*.log
+/aclocal.m4
+/compile
+/config.guess
+/config.h.in
+/config.log
+/config.status
+/config.sub
+/configure
+/configure.scan
+/depcomp
+/install-sh
+/missing
+/stamp-h1
+
+# https://www.gnu.org/software/libtool/
+/ltmain.sh
+
+# http://www.gnu.org/software/texinfo
+/texinfo.tex
+
+# http://www.gnu.org/software/m4/
+m4/libtool.m4
+m4/ltoptions.m4
+m4/ltsugar.m4
+m4/ltversion.m4
+m4/lt~obsolete.m4