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/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
* Code for manipulating FIFO buffers.
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*/
/* RCSID("$OpenBSD: buffer.h,v 1.6 2000/09/07 20:27:50 deraadt Exp $"); */
#ifndef BUFFER_H
#define BUFFER_H
typedef struct {
char *buf; /* Buffer for data. */
unsigned int alloc; /* Number of bytes allocated for data. */
unsigned int offset; /* Offset of first byte containing data. */
unsigned int end; /* Offset of last byte containing data. */
} Buffer;
/* Initializes the buffer structure. */
void buffer_init(Buffer * buffer);
/* Frees any memory used for the buffer. */
void buffer_free(Buffer * buffer);
/* Clears any data from the buffer, making it empty. This does not actually
zero the memory. */
void buffer_clear(Buffer * buffer);
/* Appends data to the buffer, expanding it if necessary. */
void buffer_append(Buffer * buffer, const char *data, unsigned int len);
/*
* Appends space to the buffer, expanding the buffer if necessary. This does
* not actually copy the data into the buffer, but instead returns a pointer
* to the allocated region.
*/
void buffer_append_space(Buffer * buffer, char **datap, unsigned int len);
/* Returns the number of bytes of data in the buffer. */
unsigned int buffer_len(Buffer * buffer);
/* Gets data from the beginning of the buffer. */
void buffer_get(Buffer * buffer, char *buf, unsigned int len);
/* Consumes the given number of bytes from the beginning of the buffer. */
void buffer_consume(Buffer * buffer, unsigned int bytes);
/* Consumes the given number of bytes from the end of the buffer. */
void buffer_consume_end(Buffer * buffer, unsigned int bytes);
/* Returns a pointer to the first used byte in the buffer. */
char *buffer_ptr(Buffer * buffer);
/*
* Dumps the contents of the buffer to stderr in hex. This intended for
* debugging purposes only.
*/
void buffer_dump(Buffer * buffer);
#endif /* BUFFER_H */
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