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#include "osc.h"
#include "../internal.h"
#include <stdlib.h>
#include <string.h>
static int b64_val(char c)
{
if (c >= 'A' && c <= 'Z') return c - 'A';
if (c >= 'a' && c <= 'z') return c - 'a' + 26;
if (c >= '0' && c <= '9') return c - '0' + 52;
if (c == '+') return 62;
if (c == '/') return 63;
return -1;
}
static bool b64_decode(const char *s, size_t n, char *out, size_t *out_len)
{
size_t pad = 0;
while (pad < n && s[n - pad - 1] == '=')
pad++;
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 term_osc52(struct term *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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