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#include "zfstream.h" |
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|
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gzfilebuf::gzfilebuf() : |
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file(NULL), |
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mode(0), |
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own_file_descriptor(0) |
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{ } |
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|
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gzfilebuf::~gzfilebuf() { |
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|
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sync(); |
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if ( own_file_descriptor ) |
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close(); |
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|
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} |
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|
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gzfilebuf *gzfilebuf::open( const char *name, |
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int io_mode ) { |
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|
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if ( is_open() ) |
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return NULL; |
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|
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char char_mode[10]; |
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char *p = char_mode; |
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|
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if ( io_mode & ios::in ) { |
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mode = ios::in; |
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*p++ = 'r'; |
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} else if ( io_mode & ios::app ) { |
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mode = ios::app; |
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*p++ = 'a'; |
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} else { |
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mode = ios::out; |
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*p++ = 'w'; |
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} |
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|
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if ( io_mode & ios::binary ) { |
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mode |= ios::binary; |
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*p++ = 'b'; |
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} |
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|
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// Hard code the compression level |
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if ( io_mode & (ios::out|ios::app )) { |
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*p++ = '9'; |
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} |
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|
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// Put the end-of-string indicator |
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*p = '\0'; |
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|
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if ( (file = gzopen(name, char_mode)) == NULL ) |
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return NULL; |
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|
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own_file_descriptor = 1; |
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|
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return this; |
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|
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} |
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|
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gzfilebuf *gzfilebuf::attach( int file_descriptor, |
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int io_mode ) { |
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|
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if ( is_open() ) |
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return NULL; |
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|
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char char_mode[10]; |
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char *p = char_mode; |
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|
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if ( io_mode & ios::in ) { |
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mode = ios::in; |
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*p++ = 'r'; |
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} else if ( io_mode & ios::app ) { |
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mode = ios::app; |
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*p++ = 'a'; |
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} else { |
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mode = ios::out; |
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*p++ = 'w'; |
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} |
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|
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if ( io_mode & ios::binary ) { |
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mode |= ios::binary; |
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*p++ = 'b'; |
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} |
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|
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// Hard code the compression level |
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if ( io_mode & (ios::out|ios::app )) { |
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*p++ = '9'; |
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} |
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|
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// Put the end-of-string indicator |
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*p = '\0'; |
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|
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if ( (file = gzdopen(file_descriptor, char_mode)) == NULL ) |
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return NULL; |
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|
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own_file_descriptor = 0; |
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|
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return this; |
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|
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} |
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|
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gzfilebuf *gzfilebuf::close() { |
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|
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if ( is_open() ) { |
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|
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sync(); |
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gzclose( file ); |
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file = NULL; |
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|
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} |
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|
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return this; |
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|
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} |
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|
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int gzfilebuf::setcompressionlevel( int comp_level ) { |
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|
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return gzsetparams(file, comp_level, -2); |
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|
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} |
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|
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int gzfilebuf::setcompressionstrategy( int comp_strategy ) { |
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|
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return gzsetparams(file, -2, comp_strategy); |
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|
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} |
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|
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|
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streampos gzfilebuf::seekoff( streamoff off, ios::seek_dir dir, int which ) { |
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|
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return streampos(EOF); |
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|
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} |
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|
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int gzfilebuf::underflow() { |
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|
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// If the file hasn't been opened for reading, error. |
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if ( !is_open() || !(mode & ios::in) ) |
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return EOF; |
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|
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// if a buffer doesn't exists, allocate one. |
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if ( !base() ) { |
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|
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if ( (allocate()) == EOF ) |
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return EOF; |
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setp(0,0); |
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|
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} else { |
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|
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if ( in_avail() ) |
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return (unsigned char) *gptr(); |
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|
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if ( out_waiting() ) { |
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if ( flushbuf() == EOF ) |
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return EOF; |
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} |
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|
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} |
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|
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// Attempt to fill the buffer. |
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|
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int result = fillbuf(); |
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if ( result == EOF ) { |
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// disable get area |
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setg(0,0,0); |
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return EOF; |
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} |
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|
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return (unsigned char) *gptr(); |
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|
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} |
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|
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int gzfilebuf::overflow( int c ) { |
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|
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if ( !is_open() || !(mode & ios::out) ) |
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return EOF; |
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|
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if ( !base() ) { |
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if ( allocate() == EOF ) |
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return EOF; |
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setg(0,0,0); |
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} else { |
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if (in_avail()) { |
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return EOF; |
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} |
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if (out_waiting()) { |
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if (flushbuf() == EOF) |
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return EOF; |
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} |
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} |
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|
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int bl = blen(); |
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setp( base(), base() + bl); |
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|
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if ( c != EOF ) { |
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|
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*pptr() = c; |
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pbump(1); |
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|
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} |
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|
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return 0; |
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|
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} |
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|
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int gzfilebuf::sync() { |
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|
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if ( !is_open() ) |
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return EOF; |
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|
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if ( out_waiting() ) |
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return flushbuf(); |
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|
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return 0; |
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|
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} |
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|
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int gzfilebuf::flushbuf() { |
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|
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int n; |
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char *q; |
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|
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q = pbase(); |
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n = pptr() - q; |
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|
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if ( gzwrite( file, q, n) < n ) |
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return EOF; |
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|
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setp(0,0); |
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|
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return 0; |
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|
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} |
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|
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int gzfilebuf::fillbuf() { |
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|
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int required; |
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char *p; |
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|
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p = base(); |
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|
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required = blen(); |
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|
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int t = gzread( file, p, required ); |
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|
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if ( t <= 0) return EOF; |
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|
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setg( base(), base(), base()+t); |
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|
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return t; |
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|
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} |
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|
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gzfilestream_common::gzfilestream_common() : |
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ios( gzfilestream_common::rdbuf() ) |
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{ } |
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|
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gzfilestream_common::~gzfilestream_common() |
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{ } |
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|
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void gzfilestream_common::attach( int fd, int io_mode ) { |
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|
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if ( !buffer.attach( fd, io_mode) ) |
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clear( ios::failbit | ios::badbit ); |
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else |
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clear(); |
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|
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} |
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|
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void gzfilestream_common::open( const char *name, int io_mode ) { |
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|
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if ( !buffer.open( name, io_mode ) ) |
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clear( ios::failbit | ios::badbit ); |
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else |
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clear(); |
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|
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} |
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|
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void gzfilestream_common::close() { |
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|
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if ( !buffer.close() ) |
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clear( ios::failbit | ios::badbit ); |
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|
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} |
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|
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gzfilebuf *gzfilestream_common::rdbuf() |
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{ |
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return &buffer; |
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} |
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|
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gzifstream::gzifstream() : |
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ios( gzfilestream_common::rdbuf() ) |
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{ |
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clear( ios::badbit ); |
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} |
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|
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gzifstream::gzifstream( const char *name, int io_mode ) : |
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ios( gzfilestream_common::rdbuf() ) |
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{ |
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gzfilestream_common::open( name, io_mode ); |
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} |
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|
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gzifstream::gzifstream( int fd, int io_mode ) : |
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ios( gzfilestream_common::rdbuf() ) |
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{ |
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gzfilestream_common::attach( fd, io_mode ); |
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} |
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|
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gzifstream::~gzifstream() { } |
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|
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gzofstream::gzofstream() : |
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ios( gzfilestream_common::rdbuf() ) |
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{ |
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clear( ios::badbit ); |
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} |
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|
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gzofstream::gzofstream( const char *name, int io_mode ) : |
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ios( gzfilestream_common::rdbuf() ) |
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{ |
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gzfilestream_common::open( name, io_mode ); |
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} |
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|
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gzofstream::gzofstream( int fd, int io_mode ) : |
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ios( gzfilestream_common::rdbuf() ) |
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{ |
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gzfilestream_common::attach( fd, io_mode ); |
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} |
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|
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gzofstream::~gzofstream() { } |
