trnr/tlib
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

add oversampler

Browse Source
This commit is contained in:
Chris
2024-05-24 13:28:31 +02:00
parent e4a4a661a0
commit 989dba5a6b
484 changed files with 313937 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

108
oversampling/WDL/wdl_base64.h Normal file
View File

@@ -0,0 +1,108 @@
#ifndef _WDL_BASE64_H_
#define _WDL_BASE64_H_
#ifndef WDL_BASE64_FUNCDECL
#define WDL_BASE64_FUNCDECL static
#endif
static const char wdl_base64_alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
WDL_BASE64_FUNCDECL void wdl_base64encode(const unsigned char *in, char *out, int len)
{
while (len >= 6)
{
const int accum = (in[0] << 16) + (in[1] << 8) + in[2];
const int accum2 = (in[3] << 16) + (in[4] << 8) + in[5];
out[0] = wdl_base64_alphabet[(accum >> 18) & 0x3F];
out[1] = wdl_base64_alphabet[(accum >> 12) & 0x3F];
out[2] = wdl_base64_alphabet[(accum >> 6) & 0x3F];
out[3] = wdl_base64_alphabet[accum & 0x3F];
out[4] = wdl_base64_alphabet[(accum2 >> 18) & 0x3F];
out[5] = wdl_base64_alphabet[(accum2 >> 12) & 0x3F];
out[6] = wdl_base64_alphabet[(accum2 >> 6) & 0x3F];
out[7] = wdl_base64_alphabet[accum2 & 0x3F];
out+=8;
in+=6;
len-=6;
}
if (len >= 3)
{
const int accum = (in[0]<<16)|(in[1]<<8)|in[2];
out[0] = wdl_base64_alphabet[(accum >> 18) & 0x3F];
out[1] = wdl_base64_alphabet[(accum >> 12) & 0x3F];
out[2] = wdl_base64_alphabet[(accum >> 6) & 0x3F];
out[3] = wdl_base64_alphabet[accum & 0x3F];
in+=3;
len-=3;
out+=4;
}
if (len>0)
{
if (len == 2)
{
const int accum = (in[0] << 8) | in[1];
out[0] = wdl_base64_alphabet[(accum >> 10) & 0x3F];
out[1] = wdl_base64_alphabet[(accum >> 4) & 0x3F];
out[2] = wdl_base64_alphabet[(accum & 0xF)<<2];
}
else
{
const int accum = in[0];
out[0] = wdl_base64_alphabet[(accum >> 2) & 0x3F];
out[1] = wdl_base64_alphabet[(accum & 0x3)<<4];
out[2]='=';
}
out[3]='=';
out+=4;
}
out[0]=0;
}
WDL_BASE64_FUNCDECL int wdl_base64decode(const char *src, unsigned char *dest, int destsize)
{
static const char *tab = // poolable string
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x3e\xff\xff\xff\x3f"
"\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\xff\xff\xff\xff\xff\xff"
"\xff\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e"
"\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\xff\xff\xff\xff\xff"
"\xff\x1a\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26\x27\x28"
"\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30\x31\x32\x33\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff"
"\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff";
unsigned int accum=0;
int nbits=0, wpos=0;
if (destsize <= 0) return 0;
for (;;)
{
const int v=(int)tab[*(unsigned char *)src++];
if (v<0) return wpos;
accum += v;
nbits += 6;
if (nbits >= 8)
{
nbits-=8;
dest[wpos] = (accum>>nbits)&0xff;
if (++wpos >= destsize) return wpos;
}
accum <<= 6;
}
}
#endif