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#include <stdio.h>
int frombigendian(const unsigned char in[4])
{
return (in[0] << 24) | (in[1] << 16) | (in[2] << 8) | in[3];
}
void tobigendian(const int in, unsigned char out[4])
{
out[0] = (in >> 24) & 0xff;
out[1] = (in >> 16) & 0xff;
out[2] = (in >> 8) & 0xff;
out[3] = in & 0xff;
}
/* function is lifted from */
/* https://github.com/heinrich5991/libtw2/blob/b9286674da94d3d45b9c10ffce517af394e2d58c/packer/src/lib.rs#L62 */
int readint(char **cp)
{
int result = 0;
int len = 1;
unsigned char src = **cp;
(*cp)++;
int sign = ((src >> 6) & 1);
result |= (src & 0b00111111);
for (int i = 0; i < 4; i++)
{
// printf("(%d, ", src);
if ((src & 0b10000000) == 0)
break;
src = **cp;
(*cp)++;
len++;
if (i == 3 && (src & 0b11110000) != 0)
printf("[ WARNING ] Non zero int padding!\n");
result |= (src & 0b01111111) << (6 + 7 * i);
}
if (len > 1 && src == 0b00000000)
printf("[ WARNING ] Overlong int encoding!\n");
result ^= -sign;
return result;
}
/*
int readint(char **src)
{
const int sign = (**src >> 6) & 1;
int out = **src & 0x3f;
const static int masks[] = {0x7F, 0x7F, 0x7F, 0x0F};
const static int shifts[] = {6, 6 + 7, 6 + 7 + 7, 6 + 7 + 7 + 7};
for (unsigned int i = 0; i < sizeof(masks); i++)
{
if (!(**src & 0x80))
break;
(*src)++;
out |= (**src & masks[i]) << shifts[i];
}
(*src)++;
out ^= -sign;
return out;
}
*/
/* function is lifted from */
/* https://github.com/heinrich5991/libtw2/blob/b9286674da94d3d45b9c10ffce517af394e2d58c/packer/src/lib.rs#L105 */
void writeint(int i, char **cp)
{
int sign = i < 0;
unsigned int in = i;
in = (in ^ -sign);
char next = (in & 0b00111111);
in >>= 6;
char head = 0;
if (in != 0)
head |= 0b10000000;
if (sign != 0)
head |= 0b01000000;
**cp = head | next;
(*cp)++;
while (in != 0)
{
next = (in & 0b01111111);
in >>= 7;
if (in != 0)
head = 0b10000000;
else
head = 0;
**cp = head | next;
(*cp)++;
}
}
void intstostr(const int *ints, int num, char *str)
{
while (num)
{
str[0] = (((*ints) >> 24) & 0xff) - 128;
str[1] = (((*ints) >> 16) & 0xff) - 128;
str[2] = (((*ints) >> 8) & 0xff) - 128;
str[3] = ((*ints) & 0xff) - 128;
str += 4;
ints++;
num--;
}
str[-1] = 0;
}
void strtoint(const char *str, int num, int *ints)
{
int intloc = 3;
*ints = 0;
while (num)
{
if (intloc < 0)
{
ints++;
*ints = 0;
intloc = 3;
}
*ints |= (*str + 128) << (8 * intloc);
str++;
intloc--;
num--;
}
}
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