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Variable Byte

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powturbo
2015-07-08 16:19:39 +02:00
parent 893c9565a9
commit 4f57826e27
1 changed files with 29 additions and 0 deletions
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29
vint.c
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@ -203,3 +203,32 @@ unsigned char *vbdec15(unsigned char *__restrict in, unsigned n, unsigned short
unsigned char *vbenc16(unsigned short *__restrict in, unsigned n, unsigned char *__restrict out) { unsigned short *in_ = in +n; while(in < in_) vbput16(out, *in++); return out;}
unsigned char *vbdec16(unsigned char *__restrict in, unsigned n, unsigned short *__restrict out) { unsigned short *out_ = out+n,x; while(out < out_) _vbget16(in, x, *out++ = x); return in; }
//---------------------------------- Zigzag encoding ------------------------------------------------------------------------------------
unsigned char *vbzenc32(unsigned *__restrict in, unsigned n, unsigned char *__restrict out, unsigned start) {
unsigned *ip,v;
for(ip = in; ip != in+(n&~(4-1)); ) {
v = zigzagenc32((*ip)-start); start=*ip++; _vbputu32(out, v, ;);
v = zigzagenc32((*ip)-start); start=*ip++; _vbputu32(out, v, ;);
v = zigzagenc32((*ip)-start); start=*ip++; _vbputu32(out, v, ;);
v = zigzagenc32((*ip)-start); start=*ip++; _vbputu32(out, v, ;);
}
while(ip < in+n) { v = zigzagenc32((*ip)-start); start = *ip++; _vbputu32(out, v, ;); }
return out;
}
unsigned char *vbzdec32(unsigned char *__restrict in, unsigned n, unsigned *__restrict out, unsigned start) {
unsigned x,*op;
for(op = out; op != out+(n&~(8-1)); ) {
_vbgetu32(in, x, ;); *op++ = (start += zigzagdec32(x));
_vbgetu32(in, x, ;); *op++ = (start += zigzagdec32(x));
_vbgetu32(in, x, ;); *op++ = (start += zigzagdec32(x));
_vbgetu32(in, x, ;); *op++ = (start += zigzagdec32(x));
_vbgetu32(in, x, ;); *op++ = (start += zigzagdec32(x));
_vbgetu32(in, x, ;); *op++ = (start += zigzagdec32(x));
_vbgetu32(in, x, ;); *op++ = (start += zigzagdec32(x));
_vbgetu32(in, x, ;); *op++ = (start += zigzagdec32(x));
}
while(op != out+n) _vbgetu32(in, x, *op++ = (start += zigzagdec32(x)));
return in;
}