Buffer.h File Reference

#include "standard.h"

Go to the source code of this file.

Classes

struct Buffer

Functions

Buffer * mkbuffer (int n, size_t len)

int bsize (Buffer *b)

int bhead (Buffer *b)

int btail (Buffer *b)

void bwrite (Buffer *b, void *data)

int bread (Buffer *b, void *data)

int blevel (Buffer *b)

void * bpeek (Buffer *b, int n)

void closebuffer (Buffer *b)

Function Documentation

int bhead ( Buffer * b )

Definition at line 45 of file Buffer.c.
References Buffer::head.
00049 { 00050 return b->head; 00051 }

int blevel ( Buffer * b )

Definition at line 111 of file Buffer.c.
References Buffer::full, Buffer::head, Buffer::n, and Buffer::tail.
Referenced by al_buffer_level(), al_indication(), al_request(), al_requested_size(), al_send_byte(), al_send_request(), bpeek(), channel_read_indication(), find_rcpc(), and send_closing_flag().
00115 { 00116 if (b->head == b->tail) { 00117 if (b->full) 00118 return b->n; 00119 else 00120 return 0; 00121 } 00122 if (b->head > b->tail) 00123 return (b->head - b->tail); 00124 if (b->head < b->tail) 00125 return (b->n + b->head - b->tail); 00126 }

void* bpeek ( Buffer * b,

int n

)

Definition at line 129 of file Buffer.c.
References blevel(), Buffer::data, Buffer::len, Buffer::n, and Buffer::tail.
Referenced by al_requested_size(), find_rcpc(), and place_rcpc().
00134 { 00135 if (n<0) 00136 return NULL; 00137 00138 if (blevel(b) < n+1) 00139 return NULL; 00140 00141 return (b->data + ((b->tail + n) % b->n) * b->len); 00142 }

int bread ( Buffer * b,

void * data

)

Definition at line 87 of file Buffer.c.
References Buffer::data, data, Buffer::full, Buffer::head, Buffer::len, Buffer::n, and Buffer::tail.
Referenced by al_receive(), channel_read(), get_al_pdu(), MakeNewVideoPacket(), and send_closing_flag().
00091 : 00092 * 1 = ok 00093 * 0 = failed 00094 */ 00095 { 00096 if ((b->head==b->tail) && !(b->full)) 00097 return 0; 00098 00099 memcpy(data, b->data + b->tail*b->len, b->len); 00100 00101 b->tail++; 00102 if (b->tail==b->n) 00103 b->tail=0; 00104 00105 b->full=0; 00106 00107 return 1; 00108 }

int bsize ( Buffer * b )

Definition at line 36 of file Buffer.c.
References Buffer::n.
Referenced by al_send_byte(), and al_send_request().
00040 { 00041 return b->n; 00042 }

int btail ( Buffer * b )

Definition at line 54 of file Buffer.c.
References Buffer::tail.
00058 { 00059 return b->tail; 00060 }

void bwrite ( Buffer * b,

void * data

)

Definition at line 63 of file Buffer.c.
References data, Buffer::data, Buffer::full, Buffer::head, Buffer::len, Buffer::n, and Buffer::tail.
Referenced by al_arq_received(), al_arq_request(), al_send_byte(), al_send_request(), channel_write(), place_rcpc(), send_closing_flag(), and send_to_al().
00069 { 00070 int offset = b->head*b->len; 00071 memcpy(b->data+offset, data, b->len); 00072 00073 if ((b->head == b->tail) && b->full) { 00074 b->tail++; 00075 if (b->tail==b->n) 00076 b->tail=0; 00077 } 00078 b->head++; 00079 00080 if (b->head == b->n) 00081 b->head=0; 00082 if (b->head == b->tail) 00083 b->full=1; 00084 }

void closebuffer ( Buffer * b )

Definition at line 145 of file Buffer.c.
References Buffer::data.
Referenced by close_channel().
00149 { 00150 free(b->data); 00151 free(b); 00152 }

Buffer* mkbuffer ( int n,

size_t len

)

Definition at line 8 of file Buffer.c.
References Buffer::data, Buffer::full, Buffer::head, Buffer::len, Buffer::n, and Buffer::tail.
Referenced by new_al_receiving_entity(), new_al_sending_entity(), and new_channel().
00014 { 00015 Buffer *r; 00016 00017 r = (Buffer *) malloc(sizeof(Buffer)); 00018 if (r == NULL) 00019 return NULL; 00020 00021 r->data = (void *) malloc(n * len); 00022 if (r->data == NULL) { 00023 free(r); 00024 return NULL; 00025 } 00026 memset(r->data, 0, n * len); 00027 r->head=0; 00028 r->tail=0; 00029 r->full=0; 00030 r->n=n; 00031 r->len=len; 00032 return r; 00033 }

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