xeye_ atsu
/
RiceGolombDPCM_Player
For BU9480F D-A Conv.
_bitio.cpp@0:805cffac956b, 2010-08-26 (annotated)
- Committer:
- lynxeyed_atsu
- Date:
- Thu Aug 26 12:48:50 2010 +0000
- Revision:
- 0:805cffac956b
- Child:
- 1:02bfb013660c
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
lynxeyed_atsu | 0:805cffac956b | 1 | #include "mbed.h" |
lynxeyed_atsu | 0:805cffac956b | 2 | #include "string" |
lynxeyed_atsu | 0:805cffac956b | 3 | #include "_bitio.h" |
lynxeyed_atsu | 0:805cffac956b | 4 | |
lynxeyed_atsu | 0:805cffac956b | 5 | |
lynxeyed_atsu | 0:805cffac956b | 6 | /* |
lynxeyed_atsu | 0:805cffac956b | 7 | #define TRUE 1 |
lynxeyed_atsu | 0:805cffac956b | 8 | #define FALSE 0 |
lynxeyed_atsu | 0:805cffac956b | 9 | */ |
lynxeyed_atsu | 0:805cffac956b | 10 | #define rightbits(n, x) ((x) & ((1U << (n)) - 1U)) |
lynxeyed_atsu | 0:805cffac956b | 11 | /* |
lynxeyed_atsu | 0:805cffac956b | 12 | typedef unsigned int Uint; |
lynxeyed_atsu | 0:805cffac956b | 13 | typedef unsigned char Uchar; |
lynxeyed_atsu | 0:805cffac956b | 14 | */ |
lynxeyed_atsu | 0:805cffac956b | 15 | FILE *infp, *outfp; |
lynxeyed_atsu | 0:805cffac956b | 16 | int getcount, putcount; |
lynxeyed_atsu | 0:805cffac956b | 17 | Uint bitbuf; |
lynxeyed_atsu | 0:805cffac956b | 18 | |
lynxeyed_atsu | 0:805cffac956b | 19 | void init_bit_o(void) |
lynxeyed_atsu | 0:805cffac956b | 20 | { |
lynxeyed_atsu | 0:805cffac956b | 21 | putcount = 8; bitbuf = 0; |
lynxeyed_atsu | 0:805cffac956b | 22 | } |
lynxeyed_atsu | 0:805cffac956b | 23 | |
lynxeyed_atsu | 0:805cffac956b | 24 | void init_bit_i(void) |
lynxeyed_atsu | 0:805cffac956b | 25 | { |
lynxeyed_atsu | 0:805cffac956b | 26 | getcount = 0; bitbuf = 0; |
lynxeyed_atsu | 0:805cffac956b | 27 | } |
lynxeyed_atsu | 0:805cffac956b | 28 | |
lynxeyed_atsu | 0:805cffac956b | 29 | |
lynxeyed_atsu | 0:805cffac956b | 30 | Uint getbit(void) |
lynxeyed_atsu | 0:805cffac956b | 31 | { |
lynxeyed_atsu | 0:805cffac956b | 32 | int flag; |
lynxeyed_atsu | 0:805cffac956b | 33 | if (--getcount >= 0) return (bitbuf >> getcount) & 1U; |
lynxeyed_atsu | 0:805cffac956b | 34 | getcount = 7; |
lynxeyed_atsu | 0:805cffac956b | 35 | if((flag = fgetc(infp))==EOF)return OVERRUN; |
lynxeyed_atsu | 0:805cffac956b | 36 | else bitbuf = flag; |
lynxeyed_atsu | 0:805cffac956b | 37 | return (bitbuf >> 7) & 1U; |
lynxeyed_atsu | 0:805cffac956b | 38 | } |
lynxeyed_atsu | 0:805cffac956b | 39 | |
lynxeyed_atsu | 0:805cffac956b | 40 | Uint getbits(int n) |
lynxeyed_atsu | 0:805cffac956b | 41 | { |
lynxeyed_atsu | 0:805cffac956b | 42 | Uint x = 0; |
lynxeyed_atsu | 0:805cffac956b | 43 | if (n < 1 || 25 < n) return 0; |
lynxeyed_atsu | 0:805cffac956b | 44 | while (n > getcount) { |
lynxeyed_atsu | 0:805cffac956b | 45 | n -= getcount; |
lynxeyed_atsu | 0:805cffac956b | 46 | x |= rightbits(getcount, bitbuf) << n; |
lynxeyed_atsu | 0:805cffac956b | 47 | bitbuf = fgetc(infp); getcount = 8; |
lynxeyed_atsu | 0:805cffac956b | 48 | } |
lynxeyed_atsu | 0:805cffac956b | 49 | getcount -= n; |
lynxeyed_atsu | 0:805cffac956b | 50 | return x | rightbits(n, bitbuf >> getcount); |
lynxeyed_atsu | 0:805cffac956b | 51 | } |
lynxeyed_atsu | 0:805cffac956b | 52 | |
lynxeyed_atsu | 0:805cffac956b | 53 | |
lynxeyed_atsu | 0:805cffac956b | 54 | void putbit(Uint bit) |
lynxeyed_atsu | 0:805cffac956b | 55 | { |
lynxeyed_atsu | 0:805cffac956b | 56 | putcount--; |
lynxeyed_atsu | 0:805cffac956b | 57 | if (bit != 0) bitbuf |= (1 << putcount); |
lynxeyed_atsu | 0:805cffac956b | 58 | if (putcount == 0) { |
lynxeyed_atsu | 0:805cffac956b | 59 | if (fputc(bitbuf, outfp) == EOF) error("can't write\r\n"); |
lynxeyed_atsu | 0:805cffac956b | 60 | bitbuf = 0; putcount = 8; |
lynxeyed_atsu | 0:805cffac956b | 61 | } |
lynxeyed_atsu | 0:805cffac956b | 62 | } |
lynxeyed_atsu | 0:805cffac956b | 63 | |
lynxeyed_atsu | 0:805cffac956b | 64 | |
lynxeyed_atsu | 0:805cffac956b | 65 | void putbits(int n, Uint x) |
lynxeyed_atsu | 0:805cffac956b | 66 | { |
lynxeyed_atsu | 0:805cffac956b | 67 | if (n < 1 || 25 < n) return; |
lynxeyed_atsu | 0:805cffac956b | 68 | while (n >= putcount) { |
lynxeyed_atsu | 0:805cffac956b | 69 | n -= putcount; |
lynxeyed_atsu | 0:805cffac956b | 70 | bitbuf |= rightbits(putcount, x >> n); |
lynxeyed_atsu | 0:805cffac956b | 71 | if (fputc(bitbuf, outfp) == EOF) error("cant write\r\n"); |
lynxeyed_atsu | 0:805cffac956b | 72 | bitbuf = 0U; putcount = 8; |
lynxeyed_atsu | 0:805cffac956b | 73 | } |
lynxeyed_atsu | 0:805cffac956b | 74 | putcount -= n; |
lynxeyed_atsu | 0:805cffac956b | 75 | bitbuf |= rightbits(n, x) << putcount; |
lynxeyed_atsu | 0:805cffac956b | 76 | } |