Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * Code for manipulating FIFO buffers. |
Damien Miller | 5f05637 | 2000-04-16 12:31:48 +1000 | [diff] [blame] | 6 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 7 | * As far as I am concerned, the code I have written for this software |
| 8 | * can be used freely for any purpose. Any derived versions of this |
| 9 | * software must be clearly marked as such, and if the derived work is |
| 10 | * incompatible with the protocol description in the RFC file, it must be |
| 11 | * called by a name other than "ssh" or "Secure Shell". |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 12 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 13 | |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 14 | /* RCSID("$OpenBSD: buffer.h,v 1.8 2001/06/26 06:32:48 itojun Exp $"); */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 15 | |
| 16 | #ifndef BUFFER_H |
| 17 | #define BUFFER_H |
| 18 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 19 | typedef struct { |
| 20 | char *buf; /* Buffer for data. */ |
Ben Lindstrom | 46c1622 | 2000-12-22 01:43:59 +0000 | [diff] [blame] | 21 | u_int alloc; /* Number of bytes allocated for data. */ |
| 22 | u_int offset; /* Offset of first byte containing data. */ |
| 23 | u_int end; /* Offset of last byte containing data. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 24 | } Buffer; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 25 | /* Initializes the buffer structure. */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 26 | void buffer_init(Buffer *); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | |
| 28 | /* Frees any memory used for the buffer. */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 29 | void buffer_free(Buffer *); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 30 | |
| 31 | /* Clears any data from the buffer, making it empty. This does not actually |
| 32 | zero the memory. */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 33 | void buffer_clear(Buffer *); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 34 | |
| 35 | /* Appends data to the buffer, expanding it if necessary. */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 36 | void buffer_append(Buffer *, const char *, u_int); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 37 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 38 | /* |
| 39 | * Appends space to the buffer, expanding the buffer if necessary. This does |
| 40 | * not actually copy the data into the buffer, but instead returns a pointer |
| 41 | * to the allocated region. |
| 42 | */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 43 | void buffer_append_space(Buffer *, char **, u_int); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 44 | |
| 45 | /* Returns the number of bytes of data in the buffer. */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 46 | u_int buffer_len(Buffer *); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 47 | |
| 48 | /* Gets data from the beginning of the buffer. */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 49 | void buffer_get(Buffer *, char *, u_int); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 50 | |
| 51 | /* Consumes the given number of bytes from the beginning of the buffer. */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 52 | void buffer_consume(Buffer *, u_int); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 53 | |
| 54 | /* Consumes the given number of bytes from the end of the buffer. */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 55 | void buffer_consume_end(Buffer *, u_int); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 56 | |
| 57 | /* Returns a pointer to the first used byte in the buffer. */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 58 | char *buffer_ptr(Buffer *); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 59 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 60 | /* |
| 61 | * Dumps the contents of the buffer to stderr in hex. This intended for |
| 62 | * debugging purposes only. |
| 63 | */ |
Ben Lindstrom | 16ae3d0 | 2001-07-04 04:02:36 +0000 | [diff] [blame] | 64 | void buffer_dump(Buffer *); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 65 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 66 | #endif /* BUFFER_H */ |