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e72c71e5 WJ |
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 | * @(#)buf.h 5.4 (Berkeley) 12/28/90 | |
39 | */ | |
40 | ||
41 | /*- | |
42 | * buf.h -- | |
43 | * Header for users of the buf library. | |
44 | */ | |
45 | ||
46 | #ifndef _BUF_H | |
47 | #define _BUF_H | |
48 | ||
49 | #include "sprite.h" | |
50 | ||
51 | typedef unsigned char Byte; | |
52 | ||
53 | typedef struct Buffer { | |
54 | int size; /* Current size of the buffer */ | |
55 | int left; /* Space left (== size - (inPtr - buffer)) */ | |
56 | Byte *buffer; /* The buffer itself */ | |
57 | Byte *inPtr; /* Place to write to */ | |
58 | Byte *outPtr; /* Place to read from */ | |
59 | } *Buffer; | |
60 | ||
61 | Buffer Buf_Init(); /* Initialize a buffer */ | |
62 | void Buf_Destroy(); /* Destroy a buffer */ | |
63 | void Buf_AddBytes(); /* Add a range of bytes to a buffer */ | |
64 | int Buf_GetByte(); /* Get a byte from a buffer */ | |
65 | int Buf_GetBytes(); /* Get multiple bytes */ | |
66 | void Buf_UngetByte(); /* Push a byte back into the buffer */ | |
67 | void Buf_UngetBytes(); /* Push many bytes back into the buf */ | |
68 | Byte *Buf_GetAll(); /* Get them all */ | |
69 | void Buf_Discard(); /* Throw away some of the bytes */ | |
70 | int Buf_Size(); /* See how many are there */ | |
71 | ||
72 | /* Buf_AddByte adds a single byte to a buffer. */ | |
73 | #define Buf_AddByte(bp, byte) \ | |
74 | (--(bp)->left <= 0 ? Buf_OvAddByte(bp, byte) : \ | |
75 | (void)(*(bp)->inPtr++ = (byte), *(bp)->inPtr = 0)) | |
76 | ||
77 | void Buf_OvAddByte(); /* adds a byte when buffer overflows */ | |
78 | ||
79 | #define BUF_ERROR 256 | |
80 | ||
81 | #endif _BUF_H |