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# std.zlib

Compress/decompress data using the zlib library.

References:
Wikipedia

License:
Boost License 1.0.

Authors:
Walter Bright

Source:
std/zlib.d

class ZlibException: object.Exception;
  Errors throw a ZlibException.

uint adler32(uint adler, const(void)[] buf);
  Compute the Adler32 checksum of the data in buf[]. adler is the starting value when computing a cumulative checksum.

uint crc32(uint crc, const(void)[] buf);
  Compute the CRC32 checksum of the data in buf[]. crc is the starting value when computing a cumulative checksum.

const(void)[] compress(const(void)[] srcbuf, int level);
const(void)[] compress(const(void)[] buf);
  Compresses the data in srcbuf[] using compression level level. The default value for level is 6, legal values are 1..9, with 1 being the least compression and 9 being the most. Returns the compressed data.

void[] uncompress(void[] srcbuf, size_t destlen = 0u, int winbits = 15);
  Decompresses the data in srcbuf[].

  Parameters:

  void[] srcbuf | buffer containing the compressed data.
  size_t destlen | size of the uncompressed data. It need not be accurate, but the decompression will be faster if the exact size is supplied.
  int winbits | the base two logarithm of the maximum window size.

  Returns:
  the decompressed data.

enum HeaderFormat: int;
  the header format the compressed stream is wrapped in

  deflate
    a standard zlib header

  gzip
    a gzip file format header

  determineFromData
    used when decompressing. Try to automatically detect the stream format by looking at the data

class Compress;
  Used when the data to be compressed is not all in one buffer.

  this(int level, HeaderFormat header = HeaderFormat.deflate);
  this(HeaderFormat header = HeaderFormat.deflate);
    Construct. level is the same as for D.zlib.compress(). header can be used to make a gzip compatible stream.

  const(void)[] compress(const(void)[] buf);
    Compress the data in buf and return the compressed data. The buffers returned from successive calls to this should be concatenated together.

  void[] flush(int mode = Z_FINISH);
    Compress and return any remaining data. The returned data should be appended to that returned by compress().

    Parameters:

    int mode | one of the following: Z_SYNC_FLUSH Syncs up flushing to the next byte boundary. Used when more data is to be compressed later on. Z_FULL_FLUSH Syncs up flushing to the next byte boundary. Used when more data is to be compressed later on, and the decompressor needs to be restartable at this point. Z_FINISH (default) Used when finished compressing the data.

class UnCompress;
  Used when the data to be decompressed is not all in one buffer.

  this(uint destbufsize);
  this(HeaderFormat format = HeaderFormat.determineFromData);
    Construct. destbufsize is the same as for D.zlib.uncompress().

  const(void)[] uncompress(const(void)[] buf);
    Decompress the data in buf and return the decompressed data. The buffers returned from successive calls to this should be concatenated together.

  void[] flush();
    Decompress and return any remaining data. The returned data should be appended to that returned by uncompress(). The UnCompress object cannot be used further.

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