Jostein Baustad / Mbed 2 deprecated WavPlayerSD_CB_using_RiceGulumb

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Dependencies:   mbed C12832 DogM163 FatFileSystem

_bitio.cpp@28:19aac2daf669, 2019-05-08 (annotated)

Committer:
JostBaus
Date:
Wed May 08 13:48:54 2019 +0000
Revision:
28:19aac2daf669
Wavspiller using RiceGulumb

Who changed what in which revision?

UserRevisionLine numberNew contents of line
JostBaus 28:19aac2daf669 1 #include "mbed.h"
JostBaus 28:19aac2daf669 2 #include "string"
JostBaus 28:19aac2daf669 3 #include "_bitio.h"
JostBaus 28:19aac2daf669 4
JostBaus 28:19aac2daf669 5
JostBaus 28:19aac2daf669 6 FILE *infp, *outfp;
JostBaus 28:19aac2daf669 7 int getcount, putcount;
JostBaus 28:19aac2daf669 8 Uint bitbuf;
JostBaus 28:19aac2daf669 9
JostBaus 28:19aac2daf669 10 void init_bit_o(void)
JostBaus 28:19aac2daf669 11 {
JostBaus 28:19aac2daf669 12 putcount = 8; bitbuf = 0;
JostBaus 28:19aac2daf669 13 }
JostBaus 28:19aac2daf669 14
JostBaus 28:19aac2daf669 15 void init_bit_i(void)
JostBaus 28:19aac2daf669 16 {
JostBaus 28:19aac2daf669 17 getcount = 0; bitbuf = 0;
JostBaus 28:19aac2daf669 18 }
JostBaus 28:19aac2daf669 19
JostBaus 28:19aac2daf669 20
JostBaus 28:19aac2daf669 21 Uint getbit(void)
JostBaus 28:19aac2daf669 22 {
JostBaus 28:19aac2daf669 23 int flag;
JostBaus 28:19aac2daf669 24 if (--getcount >= 0) return (bitbuf >> getcount) & 1U;
JostBaus 28:19aac2daf669 25 getcount = 7;
JostBaus 28:19aac2daf669 26 if((flag = fgetc(infp))==EOF)return OVERRUN;
JostBaus 28:19aac2daf669 27 else bitbuf = flag;
JostBaus 28:19aac2daf669 28 return (bitbuf >> 7) & 1U;
JostBaus 28:19aac2daf669 29 }
JostBaus 28:19aac2daf669 30
JostBaus 28:19aac2daf669 31 Uint getbits(int n)
JostBaus 28:19aac2daf669 32 {
JostBaus 28:19aac2daf669 33 Uint x = 0;
JostBaus 28:19aac2daf669 34 if (n < 1 || 25 < n) return 0;
JostBaus 28:19aac2daf669 35 while (n > getcount) {
JostBaus 28:19aac2daf669 36 n -= getcount;
JostBaus 28:19aac2daf669 37 x |= rightbits(getcount, bitbuf) << n;
JostBaus 28:19aac2daf669 38 bitbuf = fgetc(infp); getcount = 8;
JostBaus 28:19aac2daf669 39 }
JostBaus 28:19aac2daf669 40 getcount -= n;
JostBaus 28:19aac2daf669 41 return x | rightbits(n, bitbuf >> getcount);
JostBaus 28:19aac2daf669 42 }
JostBaus 28:19aac2daf669 43
JostBaus 28:19aac2daf669 44
JostBaus 28:19aac2daf669 45 void putbit(Uint bit)
JostBaus 28:19aac2daf669 46 {
JostBaus 28:19aac2daf669 47 putcount--;
JostBaus 28:19aac2daf669 48 if (bit != 0) bitbuf |= (1 << putcount);
JostBaus 28:19aac2daf669 49 if (putcount == 0) {
JostBaus 28:19aac2daf669 50 if (fputc(bitbuf, outfp) == EOF) error("can't write\r\n");
JostBaus 28:19aac2daf669 51 bitbuf = 0; putcount = 8;
JostBaus 28:19aac2daf669 52 }
JostBaus 28:19aac2daf669 53 }
JostBaus 28:19aac2daf669 54
JostBaus 28:19aac2daf669 55
JostBaus 28:19aac2daf669 56 void putbits(int n, Uint x)
JostBaus 28:19aac2daf669 57 {
JostBaus 28:19aac2daf669 58 if (n < 1 || 25 < n) return;
JostBaus 28:19aac2daf669 59 while (n >= putcount) {
JostBaus 28:19aac2daf669 60 n -= putcount;
JostBaus 28:19aac2daf669 61 bitbuf |= rightbits(putcount, x >> n);
JostBaus 28:19aac2daf669 62 if (fputc(bitbuf, outfp) == EOF) error("cant write\r\n");
JostBaus 28:19aac2daf669 63 bitbuf = 0U; putcount = 8;
JostBaus 28:19aac2daf669 64 }
JostBaus 28:19aac2daf669 65 putcount -= n;
JostBaus 28:19aac2daf669 66 bitbuf |= rightbits(n, x) << putcount;
JostBaus 28:19aac2daf669 67 }