1 /* 2 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California. 3 * Copyright (c) 1988, 1989 by Adam de Boor 4 * Copyright (c) 1989 by Berkeley Softworks 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Adam de Boor. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * from: @(#)buf.h 5.4 (Berkeley) 12/28/90 39 * $Id: buf.h,v 1.2 1993/08/01 18:12:06 mycroft Exp $ 40 */ 41 42 /*- 43 * buf.h -- 44 * Header for users of the buf library. 45 */ 46 47 #ifndef _BUF_H 48 #define _BUF_H 49 50 #include "sprite.h" 51 52 typedef unsigned char Byte; 53 54 typedef struct Buffer { 55 int size; /* Current size of the buffer */ 56 int left; /* Space left (== size - (inPtr - buffer)) */ 57 Byte *buffer; /* The buffer itself */ 58 Byte *inPtr; /* Place to write to */ 59 Byte *outPtr; /* Place to read from */ 60 } *Buffer; 61 62 Buffer Buf_Init(); /* Initialize a buffer */ 63 void Buf_Destroy(); /* Destroy a buffer */ 64 void Buf_AddBytes(); /* Add a range of bytes to a buffer */ 65 int Buf_GetByte(); /* Get a byte from a buffer */ 66 int Buf_GetBytes(); /* Get multiple bytes */ 67 void Buf_UngetByte(); /* Push a byte back into the buffer */ 68 void Buf_UngetBytes(); /* Push many bytes back into the buf */ 69 Byte *Buf_GetAll(); /* Get them all */ 70 void Buf_Discard(); /* Throw away some of the bytes */ 71 int Buf_Size(); /* See how many are there */ 72 73 /* Buf_AddByte adds a single byte to a buffer. */ 74 #define Buf_AddByte(bp, byte) \ 75 (--(bp)->left <= 0 ? Buf_OvAddByte(bp, byte) : \ 76 (void)(*(bp)->inPtr++ = (byte), *(bp)->inPtr = 0)) 77 78 void Buf_OvAddByte(); /* adds a byte when buffer overflows */ 79 80 #define BUF_ERROR 256 81 82 #endif _BUF_H 83