5
gzfilebuf::gzfilebuf() :
11
gzfilebuf::~gzfilebuf() {
14
if ( own_file_descriptor )
19
gzfilebuf *gzfilebuf::open( const char *name,
27
memset(char_mode,'\0',10);
30
if ( io_mode & ios::in ) {
33
} else if ( io_mode & ios::app ) {
41
if ( io_mode & ios::binary ) {
46
// Hard code the compression level
47
if ( io_mode & (ios::out|ios::app )) {
51
if ( (file = gzopen(name, char_mode)) == NULL )
54
own_file_descriptor = 1;
60
gzfilebuf *gzfilebuf::attach( int file_descriptor,
68
memset(char_mode,'\0',10);
71
if ( io_mode & ios::in ) {
74
} else if ( io_mode & ios::app ) {
82
if ( io_mode & ios::binary ) {
87
// Hard code the compression level
88
if ( io_mode & (ios::out|ios::app )) {
92
if ( (file = gzdopen(file_descriptor, char_mode)) == NULL )
95
own_file_descriptor = 0;
101
gzfilebuf *gzfilebuf::close() {
115
int gzfilebuf::setcompressionlevel( short comp_level ) {
117
return gzsetparams(file, comp_level, -2);
121
int gzfilebuf::setcompressionstrategy( short comp_strategy ) {
123
return gzsetparams(file, -2, comp_strategy);
128
streampos gzfilebuf::seekoff( streamoff off, ios::seek_dir dir, int which ) {
130
return streampos(EOF);
134
int gzfilebuf::underflow() {
136
// If the file hasn't been opened for reading, error.
137
if ( !is_open() || !(mode & ios::in) )
140
// if a buffer doesn't exists, allocate one.
143
if ( (allocate()) == EOF )
150
return (unsigned char) *gptr();
152
if ( out_waiting() ) {
153
if ( flushbuf() == EOF )
159
// Attempt to fill the buffer.
161
int result = fillbuf();
162
if ( result == EOF ) {
168
return (unsigned char) *gptr();
172
int gzfilebuf::overflow( int c ) {
174
if ( !is_open() || !(mode & ios::out) )
178
if ( allocate() == EOF )
186
if (flushbuf() == EOF)
192
setp( base(), base() + bl);
205
int gzfilebuf::sync() {
217
int gzfilebuf::flushbuf() {
225
if ( gzwrite( file, q, n) < n )
234
int gzfilebuf::fillbuf() {
243
int t = gzread( file, p, required );
245
if ( t <= 0) return EOF;
247
setg( base(), base(), base()+t);
253
gzfilestream_common::gzfilestream_common() :
254
ios( gzfilestream_common::rdbuf() )
257
gzfilestream_common::~gzfilestream_common()
260
void gzfilestream_common::attach( int fd, int io_mode ) {
262
if ( !buffer.attach( fd, io_mode) )
263
clear( ios::failbit | ios::badbit );
269
void gzfilestream_common::open( const char *name, int io_mode ) {
271
if ( !buffer.open( name, io_mode ) )
272
clear( ios::failbit | ios::badbit );
278
void gzfilestream_common::close() {
280
if ( !buffer.close() )
281
clear( ios::failbit | ios::badbit );
285
gzfilebuf *gzfilestream_common::rdbuf() {
291
gzifstream::gzifstream() :
292
ios( gzfilestream_common::rdbuf() )
294
clear( ios::badbit );
297
gzifstream::gzifstream( const char *name, int io_mode ) :
298
ios( gzfilestream_common::rdbuf() )
300
gzfilestream_common::open( name, io_mode );
303
gzifstream::gzifstream( int fd, int io_mode ) :
304
ios( gzfilestream_common::rdbuf() )
306
gzfilestream_common::attach( fd, io_mode );
309
gzifstream::~gzifstream() { }
311
gzofstream::gzofstream() :
312
ios( gzfilestream_common::rdbuf() )
314
clear( ios::badbit );
317
gzofstream::gzofstream( const char *name, int io_mode ) :
318
ios( gzfilestream_common::rdbuf() )
320
gzfilestream_common::open( name, io_mode );
323
gzofstream::gzofstream( int fd, int io_mode ) :
324
ios( gzfilestream_common::rdbuf() )
326
gzfilestream_common::attach( fd, io_mode );
329
gzofstream::~gzofstream() { }