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turbob64d.c
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turbob64d.c
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/**
Copyright (c) 2016-2019, Powturbo
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- homepage : https://sites.google.com/site/powturbo/
- github : https://github.com/powturbo
- twitter : https://twitter.com/powturbo
- email : powturbo [_AT_] gmail [_DOT_] com
**/
//------------- TurboBase64 : Base64 decoding -------------------
#define UA_MEMCPY
#include "conf.h"
#include "turbob64.h"
#include "turbob64_.h"
#if defined(TB64SHORT) && TB64SHORT < 128
#define NDS 64
#define NDX 64
#else
#define NDS 128
#define NDX 128
#endif
//--------------------- Decoding with small lut (only 64 bytes used)------------------------------------
#define _ 0xff // invald entry
static const unsigned char lut[] = {
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _,62, _, _, _,63,
52,53,54,55,56,57,58,59,60,61, _, _, _, _, _, _,
_, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,
15,16,17,18,19,20,21,22,23,24,25, _, _, _, _, _,
_,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,
41,42,43,44,45,46,47,48,49,50,51, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _
};
#undef _
#define LU32(_u_) BSWAP32(lut[(unsigned char)(_u_ )] << 26 |\
lut[(unsigned char)(_u_>> 8)] << 20 |\
lut[(unsigned char)(_u_>> 16)] << 14 |\
lut[ _u_>> 24 ] << 8)
#define LU32C(_u_) (lut[(unsigned char)(_u_ )] |\
lut[(unsigned char)(_u_>> 8)] |\
lut[(unsigned char)(_u_>> 16)] |\
lut[ _u_>> 24 ])
#define LI32C(_i_) {\
unsigned _u = BSWAP32_BE(ctou32(ip+_i_*8)); CHECK0(cu|= LU32C(_u)); _u = LU32(_u);\
unsigned _v = BSWAP32_BE(ctou32(ip+_i_*8+4)); CHECK1(cu|= LU32C(_v)); _v = LU32(_v);\
stou32(op+ _i_*6 , _u);\
stou32(op+ _i_*6+3, _v);\
}
#ifdef B64CHECK
#define LI32(a) LI32C(a)
#else
#define LI32(_i_) { \
unsigned _u = BSWAP32_BE(ctou32(ip+_i_*8)); _u = LU32(_u);\
unsigned _v = BSWAP32_BE(ctou32(ip+_i_*8+4)); _v = LU32(_v);\
stou32(op+ _i_*6 , _u);\
stou32(op+ _i_*6+3, _v);\
}
#endif
#define OVS 4
size_t tb64sdec(const unsigned char *in, size_t inlen, unsigned char *out) {
const unsigned char *ip = in;
unsigned char *op = out;
unsigned cu = 0;
if(!inlen || (inlen&3)) return 0;
#if NDS >= 64
if(inlen >= 8+OVS) {
size_t _inlen = inlen - OVS;
for(; ip < (in+inlen)-(NDS+OVS); ip += NDS, op += (NDS/4)*3) { // decode 128/64->96/48 bytes
LI32C(0); LI32(1); LI32( 2); LI32( 3); LI32( 4); LI32( 5); LI32( 6); LI32( 7);
#if NDS >= 128
LI32(8); LI32(9); LI32(10); LI32(11); LI32(12); LI32(13); LI32(14); LI32(15);
#endif
PREFETCH(ip,384, 0);
}
#endif
for(; ip < (in+inlen)-(16+OVS); ip += 16, op += (16/4)*3) { LI32(0); LI32(1); }
if( ip < (in+inlen)-( 8+OVS)) { LI32(0); ip += 8; op += (8/4)*3; }
}
for(; ip < (in+inlen)-4; ip += 4, op += 3) { unsigned u = BSWAP32_BE(ctou32(ip)); cu |= LU32C(u); u = LU32(u); stou32(op, u); }
unsigned u = 0, l = inlen - (ip-in);
if(l == 4) // last 4 bytes
if( ip[3]=='=') { l = 3;
if( ip[2]=='=') { l = 2;
if(ip[1]=='=') l = 1;
}
}
unsigned char *up = (unsigned char *)&u;
switch(l) {
case 4: u = BSWAP32_BE(ctou32(ip)); cu |= LU32C(u); u = LU32(u); *op++ = up[0]; *op++ = up[1]; *op++ = up[2]; break; // 4->3 bytes
case 3: u = BSWAP32(lut[ip[0]]<<26 | lut[ip[1]]<<20 | lut[ip[2]]<<14); *op++ = up[0]; *op++ = up[1]; cu |= lut[ip[0]] | lut[ip[1]] | lut[ip[2]]; break; // 3->2 bytes
case 2: u = BSWAP32(lut[ip[0]]<<26 | lut[ip[1]]<<20); *op++ = up[0]; cu |= lut[ip[0]] | lut[ip[1]]; break; // 2->1 byte
case 1: u = BSWAP32(lut[ip[0]]); *op++ = up[0]; cu |= lut[ip[0]]; break; // 1->1 byte
}
return (cu == 0xff)?0:(op-out);
}
//---- Fast decoding with pre shifted lookup table: 4k=4*4*256, (but only 4*4*64 = 1024 bytes used) for fast decoding ----------
#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
#define _ -1 // invalid entry
const unsigned tb64lutxd0[] = {
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _,0xf8000000, _, _, _,0xfc000000,
0xd0000000,0xd4000000,0xd8000000,0xdc000000,0xe0000000,0xe4000000,0xe8000000,0xec000000,0xf0000000,0xf4000000, _, _, _, _, _, _,
_,0x00000000,0x04000000,0x08000000,0x0c000000,0x10000000,0x14000000,0x18000000,0x1c000000,0x20000000,0x24000000,0x28000000,0x2c000000,0x30000000,0x34000000,0x38000000,
0x3c000000,0x40000000,0x44000000,0x48000000,0x4c000000,0x50000000,0x54000000,0x58000000,0x5c000000,0x60000000,0x64000000, _, _, _, _, _,
_,0x68000000,0x6c000000,0x70000000,0x74000000,0x78000000,0x7c000000,0x80000000,0x84000000,0x88000000,0x8c000000,0x90000000,0x94000000,0x98000000,0x9c000000,0xa0000000,
0xa4000000,0xa8000000,0xac000000,0xb0000000,0xb4000000,0xb8000000,0xbc000000,0xc0000000,0xc4000000,0xc8000000,0xcc000000, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _
};
const unsigned tb64lutxd1[] = {
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _,0x3e00000, _, _, _,0x3f00000,
0x3400000,0x3500000,0x3600000,0x3700000,0x3800000,0x3900000,0x3a00000,0x3b00000,0x3c00000,0x3d00000, _, _, _, _, _, _,
_,0x0000000,0x0100000,0x0200000,0x0300000,0x0400000,0x0500000,0x0600000,0x0700000,0x0800000,0x0900000,0x0a00000,0x0b00000,0x0c00000,0x0d00000,0x0e00000,
0x0f00000,0x1000000,0x1100000,0x1200000,0x1300000,0x1400000,0x1500000,0x1600000,0x1700000,0x1800000,0x1900000, _, _, _, _, _,
_,0x1a00000,0x1b00000,0x1c00000,0x1d00000,0x1e00000,0x1f00000,0x2000000,0x2100000,0x2200000,0x2300000,0x2400000,0x2500000,0x2600000,0x2700000,0x2800000,
0x2900000,0x2a00000,0x2b00000,0x2c00000,0x2d00000,0x2e00000,0x2f00000,0x3000000,0x3100000,0x3200000,0x3300000, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _
};
const unsigned tb64lutxd2[] = {
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _,0xf8000, _, _, _,0xfc000,
0xd0000,0xd4000,0xd8000,0xdc000,0xe0000,0xe4000,0xe8000,0xec000,0xf0000,0xf4000, _, _, _, _, _, _,
_,0x00000,0x04000,0x08000,0x0c000,0x10000,0x14000,0x18000,0x1c000,0x20000,0x24000,0x28000,0x2c000,0x30000,0x34000,0x38000,
0x3c000,0x40000,0x44000,0x48000,0x4c000,0x50000,0x54000,0x58000,0x5c000,0x60000,0x64000, _, _, _, _, _,
_,0x68000,0x6c000,0x70000,0x74000,0x78000,0x7c000,0x80000,0x84000,0x88000,0x8c000,0x90000,0x94000,0x98000,0x9c000,0xa0000,
0xa4000,0xa8000,0xac000,0xb0000,0xb4000,0xb8000,0xbc000,0xc0000,0xc4000,0xc8000,0xcc000, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _
};
const unsigned tb64lutxd3[] = {
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _,0x3e00, _, _, _,0x3f00,
0x3400,0x3500,0x3600,0x3700,0x3800,0x3900,0x3a00,0x3b00,0x3c00,0x3d00, _, _, _, _, _, _,
_,0x0000,0x0100,0x0200,0x0300,0x0400,0x0500,0x0600,0x0700,0x0800,0x0900,0x0a00,0x0b00,0x0c00,0x0d00,0x0e00,
0x0f00,0x1000,0x1100,0x1200,0x1300,0x1400,0x1500,0x1600,0x1700,0x1800,0x1900, _, _, _, _, _,
_,0x1a00,0x1b00,0x1c00,0x1d00,0x1e00,0x1f00,0x2000,0x2100,0x2200,0x2300,0x2400,0x2500,0x2600,0x2700,0x2800,
0x2900,0x2a00,0x2b00,0x2c00,0x2d00,0x2e00,0x2f00,0x3000,0x3100,0x3200,0x3300, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _
};
#undef _
#else
#define _ -1 // invalid entry
const unsigned tb64lutxd0[] = {
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _,0xf8, _, _, _,0xfc,
0xd0,0xd4,0xd8,0xdc,0xe0,0xe4,0xe8,0xec,0xf0,0xf4, _, _, _, _, _, _,
_,0x00,0x04,0x08,0x0c,0x10,0x14,0x18,0x1c,0x20,0x24,0x28,0x2c,0x30,0x34,0x38,
0x3c,0x40,0x44,0x48,0x4c,0x50,0x54,0x58,0x5c,0x60,0x64, _, _, _, _, _,
_,0x68,0x6c,0x70,0x74,0x78,0x7c,0x80,0x84,0x88,0x8c,0x90,0x94,0x98,0x9c,0xa0,
0xa4,0xa8,0xac,0xb0,0xb4,0xb8,0xbc,0xc0,0xc4,0xc8,0xcc, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _
};
const unsigned tb64lutxd1[] = {
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _,0xe003, _, _, _,0xf003,
0x4003,0x5003,0x6003,0x7003,0x8003,0x9003,0xa003,0xb003,0xc003,0xd003, _, _, _, _, _, _,
_,0x0000,0x1000,0x2000,0x3000,0x4000,0x5000,0x6000,0x7000,0x8000,0x9000,0xa000,0xb000,0xc000,0xd000,0xe000,
0xf000,0x0001,0x1001,0x2001,0x3001,0x4001,0x5001,0x6001,0x7001,0x8001,0x9001, _, _, _, _, _,
_,0xa001,0xb001,0xc001,0xd001,0xe001,0xf001,0x0002,0x1002,0x2002,0x3002,0x4002,0x5002,0x6002,0x7002,0x8002,
0x9002,0xa002,0xb002,0xc002,0xd002,0xe002,0xf002,0x0003,0x1003,0x2003,0x3003, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _
};
const unsigned tb64lutxd2[] = {
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _,0x800f00, _, _, _,0xc00f00,
0x000d00,0x400d00,0x800d00,0xc00d00,0x000e00,0x400e00,0x800e00,0xc00e00,0x000f00,0x400f00, _, _, _, _, _, _,
_,0x000000,0x400000,0x800000,0xc00000,0x000100,0x400100,0x800100,0xc00100,0x000200,0x400200,0x800200,0xc00200,0x000300,0x400300,0x800300,
0xc00300,0x000400,0x400400,0x800400,0xc00400,0x000500,0x400500,0x800500,0xc00500,0x000600,0x400600, _, _, _, _, _,
_,0x800600,0xc00600,0x000700,0x400700,0x800700,0xc00700,0x000800,0x400800,0x800800,0xc00800,0x000900,0x400900,0x800900,0xc00900,0x000a00,
0x400a00,0x800a00,0xc00a00,0x000b00,0x400b00,0x800b00,0xc00b00,0x000c00,0x400c00,0x800c00,0xc00c00, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _
};
const unsigned tb64lutxd3[] = {
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _,0x3e0000, _, _, _,0x3f0000,
0x340000,0x350000,0x360000,0x370000,0x380000,0x390000,0x3a0000,0x3b0000,0x3c0000,0x3d0000, _, _, _, _, _, _,
_,0x000000,0x010000,0x020000,0x030000,0x040000,0x050000,0x060000,0x070000,0x080000,0x090000,0x0a0000,0x0b0000,0x0c0000,0x0d0000,0x0e0000,
0x0f0000,0x100000,0x110000,0x120000,0x130000,0x140000,0x150000,0x160000,0x170000,0x180000,0x190000, _, _, _, _, _,
_,0x1a0000,0x1b0000,0x1c0000,0x1d0000,0x1e0000,0x1f0000,0x200000,0x210000,0x220000,0x230000,0x240000,0x250000,0x260000,0x270000,0x280000,
0x290000,0x2a0000,0x2b0000,0x2c0000,0x2d0000,0x2e0000,0x2f0000,0x300000,0x310000,0x320000,0x330000, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _,
_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _
};
#undef _
#endif
#ifdef __ARM_NEON
#define DI32(_i_) { unsigned _u = ux; ux = ctou32(ip+8+_i_*8);\
unsigned _v = vx; vx = ctou32(ip+8+_i_*8+4);\
stou64(op+ _i_*6 , DU32(_u));\
stou32(op+ _i_*6+3, DU32(_v));\
}
#define DI32C(_i_) { unsigned _u = ux; ux = ctou32(ip+8+_i_*8);\
unsigned _v = vx; vx = ctou32(ip+8+_i_*8+4);\
_u = DU32(_u); CHECK0(cu |= _u); stou64(op+ _i_*6 , _u);\
_v = DU32(_v); CHECK1(cu |= _v); stou32(op+ _i_*6+3, _v);\
}
#else
#define DI32(_i_) { unsigned _u = ux; ux = ctou32(ip+8+_i_*8); stou32(op+ _i_*6 , DU32(_u));\
unsigned _v = vx; vx = ctou32(ip+8+_i_*8+4); stou32(op+ _i_*6+3, DU32(_v));\
}
#define DI32C(_i_) { unsigned _u = ux; ux = ctou32(ip+8+_i_*8); _u = DU32(_u); CHECK0(cu |= _u); stou32(op+ _i_*6 , _u);\
unsigned _v = vx; vx = ctou32(ip+8+_i_*8+4); _v = DU32(_v); CHECK1(cu |= _v); stou32(op+ _i_*6+3, _v);\
}
#endif
#ifdef NCHECK
#define DI32C(a) DI32(a)
#else
#ifdef B64CHECK
#undef DI32
#define DI32(a) DI32C(a)
#endif
#endif
size_t tb64declen(const unsigned char *in, size_t inlen) {
if(!inlen || (inlen&3)) return 0;
size_t outlen = (inlen/4)*3;
const unsigned char *ip = in+inlen;
if( ip[-1]=='=') { outlen--;
if( ip[-2]=='=') { outlen--;
if(ip[-3]=='=') outlen--;
}
}
return outlen;
}
#define OVX 4
size_t tb64xdec(const unsigned char *in, size_t inlen, unsigned char *out) {
const unsigned char *ip = in;
unsigned char *op = out;
unsigned cu = 0;
if(!inlen || (inlen&3)) return 0;
#ifdef B64CHECK
#define NDX 64
#else
#define NDX 128
#endif
if(inlen >= 8+OVX) { // 8/16x loop unrolling: decode 128/64->96/48 bytes
unsigned ux = ctou32(ip),
vx = ctou32(ip+4);
#if NDX >= 64
for(; ip < (in+inlen)-(NDX+OVX); ip += NDX, op += (NDX/4)*3) {
DI32C(0); DI32(1); DI32( 2); DI32( 3); DI32( 4); DI32( 5); DI32( 6); DI32( 7);
#if NDX > 64
DI32(8); DI32(9); DI32(10); DI32(11); DI32(12); DI32(13); DI32(14); DI32(15);
#endif
PREFETCH(ip, 256, 0);
}
#endif
for(; ip < (in+inlen)-(16+OVX); ip += 16, op += (16/4)*3) { DI32(0); DI32(1); }
if( ip < (in+inlen)-(8+OVX)) { DI32(0); ip += 8, op += (8/4)*3; }
}
for(; ip < (in+inlen)-4; ip += 4, op += 3) { unsigned u = ctou32(ip); u = DU32(u); stou32(op, u); cu |= u; }
unsigned u = 0, l = (in+inlen) - ip;
if(l == 4) // last 4 bytes
if( ip[3]=='=') { l = 3;
if( ip[2]=='=') { l = 2;
if(ip[1]=='=') l = 1;
}
}
unsigned char *up = (unsigned char *)&u;
switch(l) {
case 4: u = ctou32(ip); u = DU32(u); *op++ = up[0]; *op++ = up[1]; *op++ = up[2]; cu |= u; break; // 4->3 bytes
case 3: u = tb64lutxd0[ip[0]] | tb64lutxd1[ip[1]] | tb64lutxd2[ip[2]]; *op++ = up[0]; *op++ = up[1]; cu |= u; break; // 3->2 bytes
case 2: u = tb64lutxd0[ip[0]] | tb64lutxd1[ip[1]]; *op++ = up[0]; cu |= u; break; // 2->1 byte
case 1: u = tb64lutxd0[ip[0]]; *op++ = up[0]; cu |= u; break; // 1->1 byte
}
return (cu == -1)?0:(op-out);
}
size_t _tb64xdec(const unsigned char *in, size_t inlen, unsigned char *out) {
const unsigned char *ip = in;
unsigned char *op = out;
unsigned cu = 0;
for(; ip < (in+inlen)-4; ip += 4, op += 3) { unsigned u = ctou32(ip); u = DU32(u); stou32(op, u); cu |= u; }
unsigned u = 0, l = (in+inlen) - ip;
if(l == 4) // last 4 bytes
if( ip[3]=='=') { l = 3;
if( ip[2]=='=') { l = 2;
if(ip[1]=='=') l = 1;
}
}
unsigned char *up = (unsigned char *)&u;
switch(l) {
case 4: u = ctou32(ip); u = DU32(u); *op++ = up[0]; *op++ = up[1]; *op++ = up[2]; cu |= u; break; // 4->3 bytes
case 3: u = tb64lutxd0[ip[0]] | tb64lutxd1[ip[1]] | tb64lutxd2[ip[2]]; *op++ = up[0]; *op++ = up[1]; cu |= u; break; // 3->2 bytes
case 2: u = tb64lutxd0[ip[0]] | tb64lutxd1[ip[1]]; *op++ = up[0]; cu |= u; break; // 2->1 byte
case 1: u = tb64lutxd0[ip[0]]; *op++ = up[0]; cu |= u; break; // 1->1 byte
}
return (cu == -1)?0:(op-out);
}