69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
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/*
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*
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* buffer.h
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*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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*
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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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*
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* Created: Sat Mar 18 04:12:25 1995 ylo
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*
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* Code for manipulating FIFO buffers.
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*
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*/
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/* RCSID("$Id: buffer.h,v 1.3 1999/11/24 19:53:44 markus 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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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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/*
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* Appends space to the buffer, expanding the buffer if necessary. This does
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* not actually copy the data into the buffer, but instead returns a pointer
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* to the allocated region.
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*/
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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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/*
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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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*/
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void buffer_dump(Buffer * buffer);
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#endif /* BUFFER_H */
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