ref: 75d6267a5f788162d92e7a5ae126cd8b0770aa8a
dir: /sys/src/cmd/aux/flashfs/utils.c/
#include <u.h> #include <libc.h> #include "flashfs.h" char* prog; ulong sectsize; ulong nsects; uchar* sectbuff; int readonly; ulong delta; int eparity; uchar magic[] = { MAGIC0, MAGIC1, MAGIC2, FFSVERS }; int putc3(uchar *buff, ulong v) { if(v < (1 << 7)) { buff[0] = v; return 1; } if(v < (1 << 13)) { buff[0] = 0x80 | (v >> 7); buff[1] = v & ((1 << 7) - 1); return 2; } if(v < (1 << 21)) { buff[0] = 0x80 | (v >> 15); buff[1] = 0x80 | ((v >> 8) & ((1 << 7) - 1)); buff[2] = v; return 3; } fprint(2, "%s: putc3 fail 0x%lux, called from %#p\n", prog, v, getcallerpc(&buff)); abort(); return -1; } int getc3(uchar *buff, ulong *p) { int c, d; c = buff[0]; if((c & 0x80) == 0) { *p = c; return 1; } c &= ~0x80; d = buff[1]; if((d & 0x80) == 0) { *p = (c << 7) | d; return 2; } d &= ~0x80; *p = (c << 15) | (d << 8) | buff[2]; return 3; } ulong get4(uchar *b) { return (b[0] << 0) | (b[1] << 8) | (b[2] << 16) | (b[3] << 24); } void put4(uchar *b, ulong v) { b[0] = v >> 0; b[1] = v >> 8; b[2] = v >> 16; b[3] = v >> 24; }