extern crate libc;
use libc::{c_int, size_t, c_void, c_char};

pub const BLOSC_VERSION_MAJOR: u32 = 1;
pub const BLOSC_VERSION_MINOR: u32 = 7;
pub const BLOSC_VERSION_RELEASE: u32 = 1;
pub const BLOSC_VERSION_STRING: &'static str = "1.7.1.dev";
pub const BLOSC_VERSION_REVISION: &'static str = "$Rev$";
pub const BLOSC_VERSION_DATE: &'static str = "$Date:: 2015-07-05 #$";
pub const BLOSCLZ_VERSION_STRING: &'static str = "1.0.5";
pub const BLOSC_VERSION_FORMAT: u32 = 2;
pub const BLOSC_MIN_HEADER_LENGTH: u32 = 16;
pub const BLOSC_MAX_OVERHEAD: u32 = BLOSC_MIN_HEADER_LENGTH;
pub const BLOSC_MAX_BUFFERSIZE: i32 = (std::i32::MAX - BLOSC_MAX_OVERHEAD as i32);
pub const BLOSC_MAX_TYPESIZE: u32 = 255;
pub const BLOSC_MAX_THREADS: u32 = 256;
pub const BLOSC_NOSHUFFLE: u32 = 0;
pub const BLOSC_SHUFFLE: u32 = 1;
pub const BLOSC_BITSHUFFLE: u32 = 2;
pub const BLOSC_DOSHUFFLE: u32 = 0x1;
pub const BLOSC_MEMCPYED: u32 = 0x2;
pub const BLOSC_DOBITSHUFFLE: u32 = 0x4;
pub const BLOSC_BLOSCLZ: u32 = 0;
pub const BLOSC_LZ4: u32 = 1;
pub const BLOSC_LZ4HC: u32 = 2;
pub const BLOSC_SNAPPY: u32 = 3;
pub const BLOSC_ZLIB: u32 = 4;
pub const BLOSC_BLOSCLZ_COMPNAME: &'static str = "blosclz";
pub const BLOSC_LZ4_COMPNAME: &'static str = "lz4";
pub const BLOSC_LZ4HC_COMPNAME: &'static str = "lz4hc";
pub const BLOSC_SNAPPY_COMPNAME: &'static str = "snappy";
pub const BLOSC_ZLIB_COMPNAME: &'static str = "zlib";
pub const BLOSC_BLOSCLZ_LIB: u32 = 0;
pub const BLOSC_LZ4_LIB: u32 = 1;
pub const BLOSC_SNAPPY_LIB: u32 = 2;
pub const BLOSC_ZLIB_LIB: u32 = 3;
pub const BLOSC_BLOSCLZ_LIBNAME: &'static str = "BloscLZ";
pub const BLOSC_LZ4_LIBNAME: &'static str = "LZ4";
pub const BLOSC_SNAPPY_LIBNAME: &'static str = "Snappy";
pub const BLOSC_ZLIB_LIBNAME: &'static str = "Zlib";
pub const BLOSC_BLOSCLZ_FORMAT: u32 =BLOSC_BLOSCLZ_LIB;
pub const BLOSC_LZ4_FORMAT: u32 = BLOSC_LZ4_LIB;
pub const BLOSC_LZ4HC_FORMAT: u32 = BLOSC_LZ4_LIB;
pub const BLOSC_SNAPPY_FORMAT: u32 = BLOSC_SNAPPY_LIB;
pub const BLOSC_ZLIB_FORMAT: u32 = BLOSC_ZLIB_LIB;
pub const BLOSC_BLOSCLZ_VERSION_FORMAT: u32 = 1;
pub const BLOSC_LZ4_VERSION_FORMAT: u32 = 1;
pub const BLOSC_LZ4HC_VERSION_FORMAT: u32 = 1;
pub const BLOSC_SNAPPY_VERSION_FORMAT: u32 = 1;
pub const BLOSC_ZLIB_VERSION_FORMAT: u32 = 1;

extern "C" {
    /**
      Initialize the Blosc library environment.

      You must call this previous to any other Blosc call, unless you want
      Blosc to be used simultaneously in a multi-threaded environment, in
      which case you should *exclusively* use the
      blosc_compress_ctx()/blosc_decompress_ctx() pair (see below).
      */
    pub fn blosc_init();
    /**
      Destroy the Blosc library environment.

      You must call this after to you are done with all the Blosc calls,
      unless you have not used blosc_init() before (see blosc_init()
      above).
      */
    pub fn blosc_destroy();
    /**
      Compress a block of data in the `src` buffer and returns the size of
      compressed block.  The size of `src` buffer is specified by
      `nbytes`.  There is not a minimum for `src` buffer size (`nbytes`).

      `clevel` is the desired compression level and must be a number
      between 0 (no compression) and 9 (maximum compression).

      `doshuffle` specifies whether the shuffle compression preconditioner
      should be applied or not.  BLOSC_NOSHUFFLE means not applying it,
      BLOSC_SHUFFLE means applying it at a byte level and BLOSC_BITSHUFFLE
      at a bit level (slower but may achieve better entropy alignment).

      `typesize` is the number of bytes for the atomic type in binary
      `src` buffer.  This is mainly useful for the shuffle preconditioner.
      For implementation reasons, only a 1 < typesize < 256 will allow the
      shuffle filter to work.  When typesize is not in this range, shuffle
      will be silently disabled.

      The `dest` buffer must have at least the size of `destsize`.  Blosc
      guarantees that if you set `destsize` to, at least,
      (`nbytes`+BLOSC_MAX_OVERHEAD), the compression will always succeed.
      The `src` buffer and the `dest` buffer can not overlap.

      Compression is memory safe and guaranteed not to write the `dest`
      buffer more than what is specified in `destsize`.

      If `src` buffer cannot be compressed into `destsize`, the return
      value is zero and you should discard the contents of the `dest`
      buffer.

      A negative return value means that an internal error happened.  This
      should never happen.  If you see this, please report it back
      together with the buffer data causing this and compression settings.
      */
    pub fn blosc_compress(clevel: c_int, doshuffle: c_int, typesize: size_t, nbytes: size_t, src: *const c_void, dest: *mut c_void, destsize: size_t) -> c_int;

    /**
      Context interface to blosc compression. This does not require a call
      to blosc_init() and can be called from multithreaded applications
      without the global lock being used, so allowing Blosc be executed
      simultaneously in those scenarios.

      It uses the same parameters than the blosc_compress() function plus:

      `compressor`: the string representing the type of compressor to use.

      `blocksize`: the requested size of the compressed blocks.  If 0, an
      automatic blocksize will be used.

      `numinternalthreads`: the number of threads to use internally.

      A negative return value means that an internal error happened.  This
      should never happen.  If you see this, please report it back
      together with the buffer data causing this and compression settings.
      */
    pub fn blosc_compress_ctx(clevel: c_int, doshuffle: c_int, typesize: size_t, nbytes: size_t, src: *const c_void, dest: *mut c_void, destsize: size_t, compressor: *const u8, blocksize: size_t, numinternalthreads: c_int) -> c_int;
    /**
      Decompress a block of compressed data in `src`, put the result in
      `dest` and returns the size of the decompressed block.

      The `src` buffer and the `dest` buffer can not overlap.

      Decompression is memory safe and guaranteed not to write the `dest`
      buffer more than what is specified in `destsize`.

      If an error occurs, e.g. the compressed data is corrupted or the
      output buffer is not large enough, then 0 (zero) or a negative value
      will be returned instead.
      */
    pub fn blosc_decompress(src: *const c_void, dest: *mut c_void, destsize: size_t) -> c_int;
    /**
      Context interface to blosc decompression. This does not require a
      call to blosc_init() and can be called from multithreaded
      applications without the global lock being used, so allowing Blosc
      be executed simultaneously in those scenarios.

      It uses the same parameters than the blosc_decompress() function plus:

      `numinternalthreads`: number of threads to use internally.

      Decompression is memory safe and guaranteed not to write the `dest`
      buffer more than what is specified in `destsize`.

      If an error occurs, e.g. the compressed data is corrupted or the
      output buffer is not large enough, then 0 (zero) or a negative value
      will be returned instead.
      */
    pub fn blosc_decompress_ctx(src: *const c_void, dest: *mut c_void, destsize: size_t, numinternalthreads: c_int) -> c_int;

    /**
      Get `nitems` (of typesize size) in `src` buffer starting in `start`.
      The items are returned in `dest` buffer, which has to have enough
      space for storing all items.

      Returns the number of bytes copied to `dest` or a negative value if
      some error happens.
      */
    pub fn blosc_getitem(src: *const c_void, start: c_int, nitems: c_int, dest: *mut c_void) -> c_int;
    /**
      Initialize a pool of threads for compression/decompression.  If
      `nthreads` is 1, then the serial version is chosen and a possible
      previous existing pool is ended.  If this is not called, `nthreads`
      is set to 1 internally.

      Returns the previous number of threads.
      */
    pub fn blosc_set_nthreads(nthreads: c_int) -> c_int;
    /**
      Select the compressor to be used.  The supported ones are "blosclz",
      "lz4", "lz4hc", "snappy" and "zlib".  If this function is not
      called, then "blosclz" will be used.

      In case the compressor is not recognized, or there is not support
      for it in this build, it returns a -1.  Else it returns the code for
      the compressor (>=0).
      */
    pub fn blosc_set_compressor(compname: *const c_char) -> c_int;
    /**
      Get the `compname` associated with the `compcode`.

      If the compressor code is not recognized, or there is not support
      for it in this build, -1 is returned.  Else, the compressor code is
      returned.
      */
    pub fn blosc_compcode_to_compname(compcode: c_int, copmname: *mut *mut c_char) -> c_int;
    /**
      Return the compressor code associated with the compressor name.

      If the compressor name is not recognized, or there is not support
      for it in this build, -1 is returned instead.
      */
    pub fn blosc_compname_to_compcode(compname: *const c_char) -> c_int;
    /**
      Get a list of compressors supported in the current build.  The
      returned value is a string with a concatenation of "blosclz", "lz4",
      "lz4hc", "snappy" or "zlib" separated by commas, depending on which
      ones are present in the build.

      This function does not leak, so you should not free() the returned
      list.

      This function should always succeed.
      */
    pub fn blosc_list_compressors() -> *const c_char;
    /**
      Return the version of blosc in string format.

      Useful for dynamic libraries.
      */
    pub fn blosc_get_version_string() -> *const c_char;
    /**
      Get info from compression libraries included in the current build.
      In `compname` you pass the compressor name that you want info from.
      In `complib` and `version` you get the compression library name and
      version (if available) as output.

      In `complib` and `version` you get a pointer to the compressor
      library name and the version in string format respectively.  After
      using the name and version, you should free() them so as to avoid
      leaks.

      If the compressor is supported, it returns the code for the library
      (>=0).  If it is not supported, this function returns -1.
      */
    pub fn blosc_get_complib_info(compname: *mut c_char, complib: *mut *mut c_char, version: *mut *mut c_char) -> c_int;
    /**
      Free possible memory temporaries and thread resources.  Use this
      when you are not going to use Blosc for a long while.  In case of
      problems releasing the resources, it returns a negative number, else
      it returns 0.
      */
    pub fn blosc_free_resources();
    /**
      Return information about a compressed buffer, namely the number of
      uncompressed bytes (`nbytes`) and compressed (`cbytes`).  It also
      returns the `blocksize` (which is used internally for doing the
      compression by blocks).

      You only need to pass the first BLOSC_MIN_HEADER_LENGTH bytes of a
      compressed buffer for this call to work.

      This function should always succeed.
      */
    pub fn blosc_cbuffer_sizes(cbuffer: *const c_void, nbytes: *mut size_t, cbytes: *mut size_t, blocksize: *mut size_t);
    /**
      Return information about a compressed buffer, namely the type size
      (`typesize`), as well as some internal `flags`.

      The `flags` is a set of bits, where the currently used ones are:
     * bit 0: whether the shuffle filter has been applied or not
     * bit 1: whether the internal buffer is a pure memcpy or not

     You can use the `BLOSC_DOSHUFFLE`, `BLOSC_DOBITSHUFFLE` and
     `BLOSC_MEMCPYED` symbols for extracting the interesting bits
     (e.g. ``flags & BLOSC_DOSHUFFLE`` says whether the buffer is
     byte-shuffled or not).

     This function should always succeed.
     */
    pub fn blosc_cbuffer_metainfo(cbuffer: *const c_void, typesize: *mut size_t, flags: *mut c_int);
    /**
      Return information about a compressed buffer, namely the internal
      Blosc format version (`version`) and the format for the internal
      Lempel-Ziv compressor used (`versionlz`).

      This function should always succeed.
      */
    pub fn blosc_cbuffer_versions(cbuffer: *const c_void, version: *mut c_int, versionlz: *mut c_int);
    /**
      Return the compressor library/format used in a compressed buffer.

      This function should always succeed.
      */
    pub fn blosc_cbuffer_complib(cbuffer: *const c_void) -> *mut c_char;
    /**
      Force the use of a specific blocksize.  If 0, an automatic
      blocksize will be used (the default).
      */
    pub fn blosc_set_blocksize(blocksize: size_t);
}