67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
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/*
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buffer.h
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Author: Tatu Ylonen <ylo@cs.hut.fi>
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Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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All rights reserved
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Created: Sat Mar 18 04:12:25 1995 ylo
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Code for manipulating FIFO buffers.
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*/
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/* RCSID("$Id: buffer.h,v 1.1 1999/10/27 03:42:43 damien Exp $"); */
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#ifndef BUFFER_H
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#define BUFFER_H
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typedef struct
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{
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char *buf; /* Buffer for data. */
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unsigned int alloc; /* Number of bytes allocated for data. */
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unsigned int offset; /* Offset of first byte containing data. */
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unsigned int end; /* Offset of last byte containing data. */
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} Buffer;
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/* Initializes the buffer structure. */
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void buffer_init(Buffer *buffer);
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/* Frees any memory used for the buffer. */
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void buffer_free(Buffer *buffer);
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/* Clears any data from the buffer, making it empty. This does not actually
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zero the memory. */
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void buffer_clear(Buffer *buffer);
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/* Appends data to the buffer, expanding it if necessary. */
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void buffer_append(Buffer *buffer, const char *data, unsigned int len);
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/* Appends space to the buffer, expanding the buffer if necessary.
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This does not actually copy the data into the buffer, but instead
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returns a pointer to the allocated region. */
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void buffer_append_space(Buffer *buffer, char **datap, unsigned int len);
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/* Returns the number of bytes of data in the buffer. */
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unsigned int buffer_len(Buffer *buffer);
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/* Gets data from the beginning of the buffer. */
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void buffer_get(Buffer *buffer, char *buf, unsigned int len);
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/* Consumes the given number of bytes from the beginning of the buffer. */
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void buffer_consume(Buffer *buffer, unsigned int bytes);
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/* Consumes the given number of bytes from the end of the buffer. */
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void buffer_consume_end(Buffer *buffer, unsigned int bytes);
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/* Returns a pointer to the first used byte in the buffer. */
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char *buffer_ptr(Buffer *buffer);
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/* Dumps the contents of the buffer to stderr in hex. This intended for
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debugging purposes only. */
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void buffer_dump(Buffer *buffer);
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#endif /* BUFFER_H */
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