133 lines
9.1 KiB
C
133 lines
9.1 KiB
C
/**
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Copyright (C) powturbo 2013-2016
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GPL v2 License
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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- homepage : https://sites.google.com/site/powturbo/
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- github : https://github.com/powturbo
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- twitter : https://twitter.com/powturbo
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- email : powturbo [_AT_] gmail [_DOT_] com
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**/
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// vint.h - "Integer Compression" variable byte include header
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#ifndef VINT_H
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#define VINT_H
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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//--------------------------- 32 bits ---------------------------------------------------------------------------------------
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extern unsigned char vtab[];
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#define vbvlen32(__x) vtab[((unsigned char)(__x))>>4]
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#define _vbput32(__op, __x, __act) {\
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if(likely(__x < (1<< 7))) { *__op++ = __x; __act;}\
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else if(likely(__x < (1<<14))) { ctou16(__op) = __x << 8 | __x >> 8 | 0x80; __op += 2; __act;}\
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else if(likely(__x < (1<<21))) { *__op++ = __x >> 16 | 0xc0; ctou32(__op) = __x; __op += 2; __act;}\
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else if(likely(__x < (1<<28))) { ctou32(__op) = rol32(__x,8) | 0xe0; __op += 4; __act;}\
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else { *__op++ = (unsigned long long)__x >> 32 | 0xf0; ctou32(__op) = __x; __op += 4; __act;}\
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}
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#define _vbget32(__ip, __x, __act) do { __x = *__ip++;\
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if(!(__x & 0x80)) { __act;}\
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else if(!(__x & 0x40)) { __x = (__x & 0x3f)<< 8 | *__ip++; __act;}\
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else if(!(__x & 0x20)) { __x = (__x & 0x1f)<<16 | ctou16(__ip); __ip += 2; __act;}\
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else if(!(__x & 0x10)) { __x = ror32(ctou32(__ip-1),8) & 0xfffffff; __ip += 3; __act;}\
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else { __x = (unsigned long long)(__x & 0x07)<<32 | ctou32(__ip); __ip += 4; __act;}\
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} while(0)
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//----------------- 16 bits -------------------------------------------------------------------------------------------------------
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#define _vbput16(__op, __x) _vbput32(__op, __x)
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#define _vbget16(__ip, __x, __act) _vbget32(__ip, __x, __act)
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//----------------- 64 bits -------------------------------------------------------------------------------------------------------
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#define _vbput64(__op, __x, __act) {\
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if(__x < 1 << 7) { *__op++ = __x << 1; __act;}\
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else if(__x < 1 <<14) { *(unsigned short *)__op = __x << 2 | 0x01; __op += 2; __act;}\
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else if(__x < 1 <<21) { *(unsigned short *)__op = __x << 3 | 0x03; __op += 2; *__op++ = __x >> 13; __act;}\
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else if(__x < 1 <<28) { *(unsigned *)__op = __x << 4 | 0x07; __op += 4; __act;}\
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else if(__x < 1ull<<35) { *(unsigned *)__op = __x << 5 | 0x0f; __op += 4; *__op++ = __x >> 27; __act;}\
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else if(__x < 1ull<<42) { *(unsigned *)__op = __x << 6 | 0x1f; __op += 4; *(unsigned short *)__op = __x >> 26; __op+=2; __act;}\
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else if(__x < 1ull<<49) { *(unsigned *)__op = __x << 7 | 0x3f; __op += 4; *(unsigned short *)__op = __x >> 25; *(__op+2) = __x >> 41; __op+=3; __act;}\
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else if(__x < 1ull<<56) { *(unsigned long long *)__op = __x << 8 | 0x7f; __op += 8; __act;}\
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else { *__op++ = 0xff; *(unsigned long long *)__op = __x; __op+=8; __act;}\
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}
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#define _vbget64(__ip, __x, __act) do {\
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if(!((__x = *__ip) & 1<<0)) { __ip++; __x >>= 1; __act;}\
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else if(!(__x & 1<<1)) { __x = (*(unsigned short *)__ip) >> 2; __ip += 2; __act;}\
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else if(!(__x & 1<<2)) { __x = (*(unsigned short *)__ip) >> 3 | *(__ip+2) << 13; __ip += 3; __act;}\
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else if(!(__x & 1<<3)) { __x = (*(unsigned *)__ip) >> 4; __ip += 4; __act;}\
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else if(!(__x & 1<<4)) { __x = (*(unsigned *)__ip) >> 5 | (unsigned long long)(*(unsigned char *)(__ip+4)) << 27; __ip += 5; __act;}\
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else if(!(__x & 1<<5)) { __x = (*(unsigned *)__ip) >> 6 | (unsigned long long)(*(unsigned short *)(__ip+4)) << 26; __ip += 6; __act;}\
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else if(!(__x & 1<<6)) { __x = (*(unsigned *)__ip) >> 7 | (unsigned long long)(*(unsigned short *)(__ip+4)) << 25 | (unsigned long long)(*(__ip+6)) << 41; __ip += 7; __act;}\
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else if(!(__x & 1<<7)) { __x = (*(unsigned long long *)__ip) >> 8; __ip += 8; __act;}\
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else { __x = *(unsigned long long *)(__ip+1); __ip += 9; __act;}\
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} while(0)
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//----------------------------- Variable byte functions -----------------------------------------------------------------------
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// Length of uncompress value. Input __x is the compressed buffer start
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#define vblen32(__x) ({ unsigned _x = __x; _x > 0x7f?(_x > 0x3fff?(_x > 0x1fffff?(_x > 0x0fffffff?5:4):3):2):1; })
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//------- encode/decode single value ----------
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#define vbput16(__op, __x) vbput32(__op, __x)
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#define vbget16(__ip) vbget32(__ip)
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#define vbput32(__op, __x) { register unsigned _x_ = __x; _vbput32(__op, _x_, ;); }
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#define vbget32(__ip) ({ register unsigned _x_; _vbget32(__ip, _x_, ;); _x_; })
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#define vbput64(__op, __x) { unsigned long long _x_ = __x; _vbput64(__op, _x_, ;); }
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#define vbget64(__ip) ({ unsigned long long _x_; _vbget64(__ip, _x_, ;); _x_; })
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// encode array with n unsigned (32 bits in[n]) values to the buffer out. Return value = end of compressed buffer out
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unsigned char *vbenc16(unsigned short *__restrict in, unsigned n, unsigned char *__restrict out);
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unsigned char *vbenc32(unsigned *__restrict in, unsigned n, unsigned char *__restrict out);
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unsigned char *vbenc64(uint64_t *__restrict in, unsigned n, unsigned char *__restrict out);
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//------ decompress buffer into an array of n unsigned values. Return value = end of decompressed buffer in
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unsigned char *vbdec16(unsigned char *__restrict in, unsigned n, unsigned short *__restrict out);
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unsigned char *vbdec32(unsigned char *__restrict in, unsigned n, unsigned *__restrict out);
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unsigned char *vbdec64(unsigned char *__restrict in, unsigned n, uint64_t *__restrict out);
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//------ increasing integer lists -------------------------------------------------------------
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unsigned char *vbdenc32(unsigned *__restrict in, unsigned n, unsigned char *__restrict out, unsigned start);
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unsigned char *vbddec32(unsigned char *__restrict in, unsigned n, unsigned *__restrict out, unsigned start);
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//----- strictly increasing (never remaining constant or decreasing) integer lists------------
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unsigned char *vbd1enc32(unsigned *__restrict in, unsigned n, unsigned char *__restrict out, unsigned start);
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unsigned char *vbd1dec32(unsigned char *__restrict in, unsigned n, unsigned *__restrict out, unsigned start);
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//------ zigzag encoding integer lists -------------------------------------------------------------
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unsigned char *vbzenc32(unsigned *__restrict in, unsigned n, unsigned char *__restrict out, unsigned start);
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unsigned char *vbzdec32(unsigned char *__restrict in, unsigned n, unsigned *__restrict out, unsigned start);
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unsigned char *vbzenc64(uint64_t *__restrict in, unsigned n, unsigned char *__restrict out, uint64_t start);
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unsigned char *vbzdec64(unsigned char *__restrict in, unsigned n, uint64_t *__restrict out, uint64_t start);
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//--- 15 bits integer lists ------------
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#define vbput15(__op, __x) do { unsigned _x = __x; if(likely(_x < 0x80)) *__op++ = _x; else { *__op++ = (_x) >> 8 | 0x80; *__op++ = _x; } } while(0)
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#define _vbget15(__ip,__x, __act) do { if((__x = *__ip++) > 0x7f) __x = (__x & 0x7f) << 8 | *__ip++; __act; } while(0)
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#define vblen15(__x) ((__x) > 0x7f?2:1)
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#define vbget15(__ip) ({ unsigned _x; _vbget15(__ip, _x, ;); _x; })
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unsigned char *vbenc15( unsigned short *__restrict in, unsigned n, unsigned char *__restrict out);
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unsigned char *vbdec15( unsigned char *__restrict in, unsigned n, unsigned short *__restrict out);
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#ifdef __cplusplus
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}
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#endif
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#endif
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