lasarus / c-compiler Goto Github PK

The readme says it does not include a linker, but it seems to include one.

I used this compiler to implement C2shellcode

Will the linker support Microsoft pe objects in the future?

Just wondering if you had any plans to add a license to the project.

-dhalf-assemble -fabi=ms -fdebug-stack-size=0 -fcmodel=large

If this parameter is added, the test examples that get the correct results in the previous compilation cannot get the correct results
Has the work behind this parameter been completed?

void
base64_encode(char *dst, const unsigned char *src, int len)
{
static const char b64[] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', '+', '/'
};

for (int i = 0; i < len; i += 3, dst += 4) {
	unsigned long x = (src[i] & 0xfful) << 16;
	dst[3] = i + 2 >= len ? '=' : b64[(x |= src[i + 2] & 0xfful) & 0x3f];
	dst[2] = i + 1 >= len ? '=' : b64[(x |= (src[i + 1] & 0xfful) << 8) >> 6 & 0x3f];
	dst[1] = b64[x >> 12 & 0x3f];
	dst[0] = b64[x >> 18];
}
*dst = '\0';

}

int
base64_decode(unsigned char *dst, const char *src)
{
static const char b64[] = {
['A'] = 0, ['B'] = 1, ['C'] = 2, ['D'] = 3,
['E'] = 4, ['F'] = 5, ['G'] = 6, ['H'] = 7,
['I'] = 8, ['J'] = 9, ['K'] = 10, ['L'] = 11,
['M'] = 12, ['N'] = 13, ['O'] = 14, ['P'] = 15,
['Q'] = 16, ['R'] = 17, ['S'] = 18, ['T'] = 19,
['U'] = 20, ['V'] = 21, ['W'] = 22, ['X'] = 23,
['Y'] = 24, ['Z'] = 25, ['a'] = 26, ['b'] = 27,
['c'] = 28, ['d'] = 29, ['e'] = 30, ['f'] = 31,
['g'] = 32, ['h'] = 33, ['i'] = 34, ['j'] = 35,
['k'] = 36, ['l'] = 37, ['m'] = 38, ['n'] = 39,
['o'] = 40, ['p'] = 41, ['q'] = 42, ['r'] = 43,
['s'] = 44, ['t'] = 45, ['u'] = 46, ['v'] = 47,
['w'] = 48, ['x'] = 49, ['y'] = 50, ['z'] = 51,
['0'] = 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,
['+'] = 62, ['/'] = 63, ['='] = 0,
};
unsigned long x;
int i, c, len, pad;

for (i = 0, x = 0, len = 0, pad = 0; src[i]; ++i) {
	c = src[i];
	if (c == '=' && (!src[i + 1] || (src[i + 1] == '=' && !src[i + 2])))
		++pad;
	else if (c >= sizeof(b64) || (!b64[c] && c != 'A'))
		return 0;
	x = x << 6 | b64[c];
	if (i % 4 == 3) {
		dst[len + 2] = x & 0xff, x >>= 8;
		dst[len + 1] = x & 0xff, x >>= 8;
		dst[len + 0] = x & 0xff;
		len += 3;
	}
}
if (i % 4 != 0)
	return 0;
return len - pad;

}

int main () {

char base64_src[100] = { 0 }; base64_src[0] = '9';
char base64_dst[100] = { 0 };
char base64_nop[100] = { 0 };
base64_encode(base64_dst, base64_src, 1);// run ok

base64_decode(base64_nop, base64_dst);// run erro

return 0;

}