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#include "osc.h"
#include "../internal.h"
#include <stdlib.h>
#include <string.h>
static const int8_t b64_lut[256] = {
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
-1, 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, -1, -1, -1, -1, -1,
-1, 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, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
static inline int b64_val(char c)
{
return b64_lut[(unsigned char)c];
}
static bool b64_decode(const char *s, size_t n, char *out, size_t *out_len)
{
size_t pad = 0;
if (n > 0 && s[n - 1] == '=') {
pad = (n > 1 && s[n - 2] == '=') ? ((n > 2 && s[n - 3] == '=') ? 3 : 2) : 1;
}
n -= pad;
if (pad > 2 || (pad && n % 4 + pad != 4))
return false;
size_t rem = n % 4;
if (rem == 1)
return false;
size_t i = 0, o = 0;
for (; i + 4 <= n; i += 4) {
int a = b64_val(s[i]), b = b64_val(s[i + 1]);
int c = b64_val(s[i + 2]), d = b64_val(s[i + 3]);
if ((a | b | c | d) < 0)
return false;
out[o++] = (char)(a << 2 | b >> 4);
out[o++] = (char)(b << 4 | c >> 2);
out[o++] = (char)(c << 6 | d);
}
if (rem >= 2) {
int a = b64_val(s[i]), b = b64_val(s[i + 1]);
if ((a | b) < 0)
return false;
out[o++] = (char)(a << 2 | b >> 4);
if (rem == 3) {
int c = b64_val(s[i + 2]);
if (c < 0)
return false;
out[o++] = (char)(b << 4 | c >> 2);
}
}
*out_len = o;
return true;
}
void wsap_vtcore_osc52(struct wsap_vtcore *t, const char *params)
{
const char *sep = strchr(params, ';');
if (!sep || sep == params)
return;
const char *pd = sep + 1;
if (!strcmp(pd, "?") || !t->cb.clipboard)
return;
size_t sel_len = (size_t)(sep - params);
char sel[64];
if (sel_len >= sizeof(sel))
return;
memcpy(sel, params, sel_len);
sel[sel_len] = '\0';
if (!*pd) {
t->cb.clipboard(t->cb.ud, sel, "", 0);
return;
}
size_t enc_len = strlen(pd);
char *dec = (char *)pd;
size_t dec_len;
if (b64_decode(pd, enc_len, dec, &dec_len))
t->cb.clipboard(t->cb.ud, sel, dec, dec_len);
}
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