#SchmierHashtable

"Eu vou passar schimia no pão, ia,ia
vou falar que eu sou alemão,ia,ia
traz a cuca e o salame meu, ia,ia
tudo ao som de um trombone, ia,ia

eu vou passar schimia no pão
vou falar que eu sou alemão
este é o bonde do alemão
então libera, libera, libera mais um chopp!"

                          Banda 2001

https://www.youtube.com/watch?v=W5UdppSb4YA

A hashtable based file versioning library.

It allows you to create hashtables using the file paths and export it to B64 encoded strings. Where you can easily import again and check what files changed based on the hashtable.

##Installing && Compiling

Everything (build, test, install) can be done simply by:

$ make
# make install

You can make and install only the Linux library by calling:

$ make linux_lib_dynamic
# make install_linux_dynamic install_linux_headers

You can make and install only Python modules by:

$ make python_modules
# make install_python_modules

And you can create production/distribution rpm and deb packages using the command:

$ make
$ make packs

As usual, to clean the project simply:

$ make clean

##Python Integration

To help integrate with python, a full python module is provided. As it is completely in C/C++ it runs as fast as it can. To use it in your script simply import it by:

from ht_file import FileVersioning

You can have any number of FileVersioning instances as necessary, they simply provides you four methods:

• reset clears the hashtable;
• add_file Add a file name to the current hashtable;
• check_file Check if the file name is in the current hashtable;
• get_table Export the hashtable compressed using LZMA and encoded in B64. Useful to distribute it in JSON and other means;
• set_table Sets the hashtable using the same string generated by get_table;

##C++

###HTFileVersioning

• static uint64_t getHTableBitsLen(void) Return the hashtable size in bits;
• static uint32_t getHTableBytesLen(void) Return the hashtable size in bytes;
• void reset(void) Clears the hashtable;
• addFile Adds a filename to hashtable;
  • void addFile(const char *fname)
  • void addFile(const std::string &fname)
• checkFile Returns true if the file name is listed on hashtable;
  • bool checkFile(const std::string &fname) const
  • bool checkFile(const char *fname) const
• void getRawHTable(void *place, size_t len) const Makes a copy of raw hashtable to *place with lengh len;
• std::string getHTable(void) const Return the hashtable compressed with LZMA and encoded in B64;
• setHTable sets htable;
  • void setHTable(std::string str)
  • void setHTable(void *place, size_t len)
• mergeHTable Merges the current with given hashtables.
  • void mergeHTable(std::string str)
  • void mergeHTable(void *place, size_t len)

###HTDataCompress

• compress Prepare data to be used by decompress; oO
• decompress Return data put in compress; =]