$ git clone https://github.com/sisong/libmd5.git ../libmd5
$ git clone https://github.com/sisong/lzma.git ../lzma
$ git clone https://github.com/sisong/zstd.git ../zstd
$ make

$ git clone https://github.com/sisong/libmd5.git ../libmd5
$ git clone https://github.com/sisong/lzma.git ../lzma
$ git clone https://github.com/sisong/zstd.git ../zstd
$ git clone https://github.com/sisong/zlib.git   ../zlib
$ git clone https://github.com/sisong/bzip2.git  ../bzip2

  oldPath newPath inputPath can be file or directory(folder),
  oldPath can empty, and input parameter ""
memory options:
  -m[-matchScore]
      DEFAULT; all file load into Memory; best diffFileSize;
      requires (newFileSize+ oldFileSize*5(or *9 when oldFileSize>=2GB))+O(1)
        bytes of memory;
      matchScore>=0, DEFAULT -m-6, recommended bin: 0--4 text: 4--9 etc...
  -s[-matchBlockSize]
      all file load as Stream; fast;
      requires O(oldFileSize*16/matchBlockSize+matchBlockSize*5*parallelThreadNumber)bytes of memory;
      matchBlockSize>=4, DEFAULT -s-64, recommended 16,32,48,1k,64k,1m etc...
special options:
  -block-fastMatchBlockSize
      must run with -m;
      set block match befor slow byte-by-byte match, DEFAULT -block-4k;
      if set -block-0, means don't use block match;
      fastMatchBlockSize>=4, recommended 256,1k,64k,1m etc...
      if newData similar to oldData then diff speed++ & diff memory--,
      but small possibility outDiffFile's size+
  -cache
      must run with -m;
      set is use a big cache for slow match, DEFAULT false;
      if newData not similar to oldData then diff speed++,
      big cache max used O(oldFileSize) memory, and build slow(diff speed--)
  -SD[-stepSize]
      create single compressed diffData, only need one decompress buffer
      when patch, and support step by step patching when step by step downloading!
      stepSize>=(1024*4), DEFAULT -SD-256k, recommended 64k,2m etc...
  -BSD
      create diffFile compatible with bsdiff4, unsupport input directory(folder).
  -VCD[-compressLevel[-dictSize]]
      create diffFile compatible with VCDIFF, unsupport input directory(folder).
      DEFAULT no compress, out format same as $open-vcdiff ... or $xdelta3 -S -e -n ...
      if set compressLevel, out format same as $xdelta3 -S lzma -e -n ...
      compress by 7zXZ(xz), compressLevel in {0..9}, DEFAULT level 7;
      dictSize can like 4096 or 4k or 4m or 16m etc..., DEFAULT 8m
      support compress by multi-thread parallel.
      NOTE: out diffFile used large source window size!
  -p-parallelThreadNumber
      if parallelThreadNumber>1 then open multi-thread Parallel mode;
      DEFAULT -p-4; requires more memory!
  -p-search-searchThreadNumber
      must run with -s[-matchBlockSize];
      DEFAULT searchThreadNumber same as parallelThreadNumber;
      but multi-thread search need frequent random disk reads when matchBlockSize
      is small, so some times multi-thread maybe much slower than single-thread!
      if (searchThreadNumber<=1) then to close multi-thread search mode.
  -c-compressType[-compressLevel]
      set outDiffFile Compress type, DEFAULT uncompress;
      for resave diffFile,recompress diffFile to outDiffFile by new set;
      support compress type & level & dict:
        -c-zlib[-{1..9}[-dictBits]]     DEFAULT level 9
            dictBits can 9--15, DEFAULT 15.
            support run by multi-thread parallel, fast!
        -c-bzip2[-{1..9}]               (or -bz2) DEFAULT level 9
        -c-pbzip2[-{1..9}]              (or -pbz2) DEFAULT level 8
            support run by multi-thread parallel, fast!
            WARNING: code not compatible with it compressed by -c-bzip2!
               and code size may be larger than if it compressed by -c-bzip2.
        -c-lzma[-{0..9}[-dictSize]]     DEFAULT level 7
            dictSize can like 4096 or 4k or 4m or 128m etc..., DEFAULT 8m
            support run by 2-thread parallel.
        -c-lzma2[-{0..9}[-dictSize]]    DEFAULT level 7
            dictSize can like 4096 or 4k or 4m or 128m etc..., DEFAULT 8m
            support run by multi-thread parallel, fast!
            WARNING: code not compatible with it compressed by -c-lzma!
        -c-zstd[-{0..22}[-dictBits]]    DEFAULT level 20
            dictBits can 10--31, DEFAULT 23.
            support run by multi-thread parallel, fast!
  -C-checksumType
      set outDiffFile Checksum type for directory diff, DEFAULT -C-fadler64;
      support checksum type:
        -C-no                   no checksum
        -C-crc32
        -C-fadler64             DEFAULT
        -C-md5
  -n-maxOpenFileNumber
      limit Number of open files at same time when stream directory diff;
      maxOpenFileNumber>=8, DEFAULT -n-48, the best limit value by different
        operating system.
  -g#ignorePath[#ignorePath#...]
      set iGnore path list when Directory Diff; ignore path list such as:
        #.DS_Store#desktop.ini#*thumbs*.db#.git*#.svn/#cache_*/00*11/*.tmp
      # means separator between names; (if char # in name, need write #: )
      * means can match any chars in name; (if char * in name, need write *: );
      / at the end of name means must match directory;
  -g-old#ignorePath[#ignorePath#...]
      set iGnore path list in oldPath when Directory Diff;
      if oldFile can be changed, need add it in old ignore list;
  -g-new#ignorePath[#ignorePath#...]
      set iGnore path list in newPath when Directory Diff;
      in general, new ignore list should is empty;
  -M#outManifestTxtFile
      create a Manifest file for inputPath; it is a text file, saved infos of
      all files and directoriy list in inputPath; this file while be used in
      manifest diff, support re-checksum data by manifest diff;
      can be used to protect historical versions be modified!
  -M-old#oldManifestFile
      oldManifestFile is created from oldPath; if no oldPath not need -M-old;
  -M-new#newManifestFile
      newManifestFile is created from newPath;
  -D  force run Directory diff between two files; DEFAULT (no -D) run
      directory diff need oldPath or newPath is directory.
  -d  Diff only, do't run patch check, DEFAULT run patch check.
  -t  Test only, run patch check, patch(oldPath,testDiffFile)==newPath ?
  -f  Force overwrite, ignore write path already exists;
      DEFAULT (no -f) not overwrite and then return error;
      if used -f and write path is exist directory, will always return error.
  --patch
      swap to hpatchz mode.
  -v  output Version info.
  -h (or -?)
      output usage info.

memory options:
  -s[-cacheSize]
      DEFAULT -s-4m; oldPath loaded as Stream;
      cacheSize can like 262144 or 256k or 512m or 2g etc....
      requires (cacheSize + 4*decompress buffer size)+O(1) bytes of memory.
      if diffFile is single compressed diffData(created by hdiffz -SD-stepSize), then requires
        (cacheSize+ stepSize + 1*decompress buffer size)+O(1) bytes of memory;
      if diffFile is created by hdiffz -BSD,bsdiff4, hdiffz -VCD, then requires
        (cacheSize + 3*decompress buffer size)+O(1) bytes of memory;
      if diffFile is created by xdelta3,open-vcdiff, then requires
        (sourceWindowSize+targetWindowSize + 3*decompress buffer size)+O(1) bytes of memory.
  -m  oldPath all loaded into Memory;
      requires (oldFileSize + 4*decompress buffer size)+O(1) bytes of memory.
      if diffFile is single compressed diffData(created by hdiffz -SD-stepSize), then requires
        (oldFileSize+ stepSize + 1*decompress buffer size)+O(1) bytes of memory.
      if diffFile is created by hdiffz -BSD,bsdiff4, then requires
        (oldFileSize + 3*decompress buffer size)+O(1) bytes of memory.
      if diffFile is VCDIFF(created by hdiffz -VCD,xdelta3,open-vcdiff), then requires
        (sourceWindowSize+targetWindowSize + 3*decompress buffer size)+O(1) bytes of memory.
special options:
  -C-checksumSets
      set Checksum data for directory patch, DEFAULT -C-new-copy;
      checksumSets support (can choose multiple):
        -C-diff         checksum diffFile;
        -C-old          checksum old reference files;
        -C-new          checksum new files edited from old reference files;
        -C-copy         checksum new files copy from old same files;
        -C-no           no checksum;
        -C-all          same as: -C-diff-old-new-copy;
  -C-no or -C-new
      if diffFile is VCDIFF, then to close or open checksum, DEFAULT -C-new.
  -n-maxOpenFileNumber
      limit Number of open files at same time when stream directory patch;
      maxOpenFileNumber>=8, DEFAULT -n-24, the best limit value by different
        operating system.
  -f  Force overwrite, ignore write path already exists;
      DEFAULT (no -f) not overwrite and then return error;
      support oldPath outNewPath same path!(patch to tempPath and overwrite old)
      if used -f and outNewPath is exist file:
        if patch output file, will overwrite;
        if patch output directory, will always return error;
      if used -f and outNewPath is exist directory:
        if patch output file, will always return error;
        if patch output directory, will overwrite, but not delete
          needless existing files in directory.
  -v  output Version info.
  -h  (or -?)
      output usage info.