Mercurial > dovecot > core-2.2
view src/lib/istream.h @ 3239:904a268921af HEAD
Added seekable variable to struct istream.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Mon, 28 Mar 2005 16:06:43 +0300 |
parents | f322b24da429 |
children | a6af023db10d |
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#ifndef __ISTREAM_H #define __ISTREAM_H struct istream { uoff_t v_offset; int stream_errno; unsigned int mmaped:1; /* be careful when copying data */ unsigned int closed:1; unsigned int seekable:1; /* we can seek() backwards */ unsigned int eof:1; /* read() has reached to end of file (but may still be data available in buffer) */ struct _istream *real_stream; }; struct istream *i_stream_create_file(int fd, pool_t pool, size_t max_buffer_size, int autoclose_fd); struct istream *i_stream_create_mmap(int fd, pool_t pool, size_t block_size, uoff_t start_offset, uoff_t v_size, int autoclose_fd); struct istream *i_stream_create_from_data(pool_t pool, const void *data, size_t size); struct istream *i_stream_create_limit(pool_t pool, struct istream *input, uoff_t v_start_offset, uoff_t v_size); /* Reference counting. References start from 1, so calling i_stream_unref() destroys the stream if i_stream_ref() is never used. */ void i_stream_ref(struct istream *stream); void i_stream_unref(struct istream *stream); /* Return file descriptor for stream, or -1 if none is available. */ int i_stream_get_fd(struct istream *stream); /* Mark the stream closed. Any reads after this will return -1. The data already read can still be used. */ void i_stream_close(struct istream *stream); /* Change the maximum size for stream's input buffer to grow. Useful only for buffered streams (currently only file). */ void i_stream_set_max_buffer_size(struct istream *stream, size_t max_size); /* Returns number of bytes read if read was ok, -1 if EOF or error, -2 if the input buffer is full. */ ssize_t i_stream_read(struct istream *stream); /* Skip forward a number of bytes. Never fails, the next read tells if it was successful. */ void i_stream_skip(struct istream *stream, uoff_t count); /* Seek to specified position from beginning of file. Never fails, the next read tells if it was successful. This works only for files. */ void i_stream_seek(struct istream *stream, uoff_t v_offset); /* Returns size of the stream, or (uoff_t)-1 if unknown */ uoff_t i_stream_get_size(struct istream *stream); /* Returns TRUE if there are any bytes left to be read or in buffer. */ int i_stream_have_bytes_left(struct istream *stream); /* Gets the next line from stream and returns it, or NULL if more data is needed to make a full line. NOTE: modifies the data in buffer for the \0, so it works only with buffered streams (currently only file). */ char *i_stream_next_line(struct istream *stream); /* Like i_stream_next_line(), but reads for more data if needed. Returns NULL if more data is needed or error occured. */ char *i_stream_read_next_line(struct istream *stream); /* Returns pointer to beginning of read data, or NULL if there's no data buffered. */ const unsigned char *i_stream_get_data(struct istream *stream, size_t *size); /* Like i_stream_get_data(), but returns non-const data. This only works with buffered streams (currently only file), others return NULL. */ unsigned char *i_stream_get_modifyable_data(struct istream *stream, size_t *size); /* Like i_stream_get_data(), but read more when needed. Returns 1 if more than threshold bytes are available, 0 if less, -1 if error or EOF with no bytes read that weren't already in buffer, or -2 if stream's input buffer is full. */ int i_stream_read_data(struct istream *stream, const unsigned char **data, size_t *size, size_t threshold); #endif