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zlib Namespace Reference

the zlib wrapper names More...

Compounds

• class CError

  the zlib exception class More...
  
  

Typedefs

• typedef std::vector< unsigned
  char > CBuffer

Enumerations

• enum ELevel { NO_COMPRESSION = 0, BEST_SPEED = 1, BEST_COMPRESSION = 9, DEFAULT_COMPRESSION = -1 }

Functions

• void Compress (const CBuffer &input, CBuffer &output, int level)
• void Compress (CBuffer &buffer, int level)
• void Compress (const void *buffer, unsigned size, CBuffer &output, int level)

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Detailed Description

the zlib wrapper names

the zlib namespace contains all zlib related classes and functions.

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Typedef Documentation

typedef std::vector<unsigned char> zlib::CBuffer

this is just a short cut for unsigned char vectors

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Function Documentation

void zlib::Compress (  const CBuffer &    input, CBuffer &    output, int    level = BEST_COMPRESSION )

compress a vector. the compressed output is placed in another vector. Parameters: input  input vector. output  output vector. it will be resized to the compressed size. level  compression level. { assert( !input.empty( ) ) ; Compress( &input[0], input.size( ), output, level ) ; }

void zlib::Compress (  CBuffer &    buffer, int    level = BEST_COMPRESSION )

compress a vector in-place. this function is provided for convinience. { assert( !buffer.empty( ) ) ; CBuffer result ; Compress( buffer, result, level ) ; result.swap( buffer ) ; }

void zlib::Compress (  const void *    buffer, unsigned    size, CBuffer &    output, int    level = BEST_COMPRESSION )

compress a raw buffer into a vector. it use a vector as output so that we can save a output size argument. { assert( buffer != 0 ) ; assert( size > 0 ) ; // double original size must be enough CBuffer result( size * 2 ) ; unsigned long out_len = result.size( ) ; int err = compress2( &result[0], &out_len, static_cast<const unsigned char*>( buffer ), size, level ) ; if ( err != Z_OK ) throw CError( err ) ; else { result.resize( out_len ) ; result.swap( output ) ; } }

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