1 /* Copyright (C) 2007-2008 The Android Open Source Project 2 ** 3 ** This software is licensed under the terms of the GNU General Public 4 ** License version 2, as published by the Free Software Foundation, and 5 ** may be copied, distributed, and modified under those terms. 6 ** 7 ** This program is distributed in the hope that it will be useful, 8 ** but WITHOUT ANY WARRANTY; without even the implied warranty of 9 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 10 ** GNU General Public License for more details. 11 */ 12 #ifndef _qemu_cbuffer_h 13 #define _qemu_cbuffer_h 14 15 #include <stdint.h> 16 17 /* Basic circular buffer type and methods */ 18 19 typedef struct { 20 uint8_t* buff; 21 int size; 22 int rpos; 23 int count; 24 } CBuffer; 25 26 static __inline__ void 27 cbuffer_reset( CBuffer* cb, void* buff, int size ) 28 { 29 cb->buff = buff; 30 cb->size = size; 31 cb->rpos = 0; 32 cb->count = 0; 33 } 34 35 static __inline__ int 36 cbuffer_write_avail( CBuffer* cb ) 37 { 38 return cb->size - cb->count; 39 } 40 41 extern int cbuffer_write( CBuffer* cb, const void* from, int len ); 42 extern int cbuffer_write_peek( CBuffer* cb, uint8_t* *pbase ); 43 extern void cbuffer_write_step( CBuffer* cb, int len ); 44 45 static __inline__ int 46 cbuffer_read_avail( CBuffer* cb ) 47 { 48 return cb->count; 49 } 50 51 extern int cbuffer_read( CBuffer* cb, void* to, int len ); 52 extern int cbuffer_read_peek( CBuffer* cb, uint8_t* *pbase ); 53 extern void cbuffer_read_step( CBuffer* cb, int len ); 54 55 extern const char* cbuffer_quote( CBuffer* cb ); 56 extern const char* cbuffer_quote_data( CBuffer* cb ); 57 extern void cbuffer_print( CBuffer* cb ); 58 59 #endif /* qemu_cbuffer_h */ 60 61 62
