static char *
decode_cchar(char *source, cchar_t *fillin, cchar_t *target)
{
int color;
attr_t attr = fillin->attr;
wchar_t chars[CCHARW_MAX];
int append = 0;
int value = 0;
T(("decode_cchar '%s'", source));
*target = blank;
#if NCURSES_EXT_COLORS
color = fillin->ext_color;
#else
color = (int) PAIR_NUMBER(attr);
#endif
source = decode_attr(source, &attr, &color);
memset(chars, 0, sizeof(chars));
source = decode_char(source, &value);
chars[0] = (wchar_t) value;
/* handle combining characters */
while (source[0] == MARKER && source[1] == APPEND) {
source += 2;
source = decode_char(source, &value);
if (++append < CCHARW_MAX) {
chars[append] = (wchar_t) value;
}
}
setcchar(target, chars, attr, (short) color, NULL);
return source;
}
/*
* Decode a base_n-encoded string into a byte sequence.
*/
bool raw_decode_base_n(BIGNUM *bn, const char *src, size_t len, int base)
{
const char *enc;
BN_zero(bn);
assert(base == 16 || base == 58);
switch (base) {
case 16:
enc = enc_16;
break;
case 58:
enc = enc_58;
break;
}
while (len) {
char current = *src;
if (base == 16)
current = tolower(current); /* TODO: Not in ccan. */
int val = decode_char(current, enc);
if (val < 0) {
BN_free(bn);
return false;
}
BN_mul_word(bn, base);
BN_add_word(bn, val);
src++;
len--;
}
return true;
}
static char *decode_parameter(const char **query, int is_name)
{
const char *q = *query;
struct strbuf out;
strbuf_init(&out, 16);
do {
unsigned char c = *q;
if (!c)
break;
if (c == '&' || (is_name && c == '=')) {
q++;
break;
}
if (c == '%') {
int val = decode_char(q + 1);
if (0 <= val) {
strbuf_addch(&out, val);
q += 3;
continue;
}
}
if (c == '+')
strbuf_addch(&out, ' ');
else
strbuf_addch(&out, c);
q++;
} while (1);
*query = q;
return strbuf_detach(&out, NULL);
}
static char* decodeA(const char* str)
{
static char decoded[1024];
char* ptr;
size_t len,i;
len = strlen(str) / 2;
if (!len--) return NULL;
if (len >= sizeof(decoded))
{
fprintf(stderr, "string is too long!\n");
assert(0);
}
ptr = decoded;
for (i = 0; i < len; i++)
ptr[i] = (decode_char(str[2 * i]) << 4) | decode_char(str[2 * i + 1]);
ptr[len] = '\0';
return ptr;
}
static void decode_str(char *str)
{
while(*str)
{
if(*str >= 65 && *str <= 90)
{
*str = decode_char(*str);
}
str++;
}
}
bool decode(const char* encoded, size_t encoded_len, BigInt* output)
{
if (encoded == 0 || encoded_len == 0)
return 0;
if (encoded_len == -1)
encoded_len = strlen(encoded);
if (encoded_len >= kMaxBase58Length)
return 0;
if (output == 0)
return 0;
BigInt output_num = 0;
size_t unprocessed = encoded_len;
while (--unprocessed) {
int idx = encoded_len - unprocessed - 1;
int num = decode_char(encoded[idx]);
if (num == -1) {
return 0;
}
output_num += num;
output_num *= 58;
}
int remainder = decode_char(encoded[encoded_len-1]);
if (remainder == -1) {
return 0;
}
*output = output_num + remainder;
return true;
}
static char *
decode_chtype(char *source, chtype fillin, chtype *target)
{
attr_t attr = ChAttrOf(fillin);
int color = PAIR_NUMBER((int) attr);
int value;
T(("decode_chtype '%s'", source));
source = decode_attr(source, &attr, &color);
source = decode_char(source, &value);
*target = (ChCharOf(value) | attr | (chtype) COLOR_PAIR(color));
/* FIXME - ignore combining characters */
return source;
}
void vigenere(char* dst, char* src, char* pass, int encode) {
int i;
int j;
int pass_len = strlen(pass);
for (i = 0, j = 0; i < strlen(src); i++, j++) {
if (encode)
dst[i] = encode_char(src[i], pass[j % pass_len]);
else
dst[i] = decode_char(src[i], pass[j % pass_len]);
}
/* Ensure trailing null character since `dst` may not have been initialized
* yet.
*/
dst[i] = '\0';
}
// translate_read() ist die inverse Operation zu translate_write, wir moechten Informationen von einem Device lesen, muessen die jedoch vorher dekodieren
ssize_t translate_read(struct file *filp, char __user *buf,
size_t count,loff_t *f_pos) {
struct translate_dev *dev = filp->private_data;
int num_copied_items = 0;
int p_reader = (dev->read_pos - dev->buffer) / sizeof(char);
#ifdef DEBUG_MESSAGES
printk(KERN_NOTICE "translate_read()\n");
#endif
while (num_copied_items < count) {
if (dev->items == 0) {
#ifdef DEBUG_MESSAGES
printk(KERN_NOTICE "translate_read: buffer empty, read %d chars \n",num_copied_items);
#endif
return num_copied_items;
}
// Zu diesem Zeitpunk haben wir die Informationen
// und der User moechte diese lesen, wir dekodieren den Buffer
// und uebergeben dann die Informationen dem User
// Falls das Device translate1 ist, dann dekodiere
if (MINOR(dev->cdev.dev) == (MINOR_START_IDX + 1)) {
decode_char(dev->read_pos);
}
if (copy_to_user(buf, dev->read_pos, 1)) {
return -EFAULT;
}
// Pointer aktualisieren
dev->read_pos = dev->buffer + ((p_reader + 1) % translate_bufsize)* sizeof(char);
p_reader = (dev->read_pos - dev->buffer) / sizeof(char);
buf += sizeof(char);
// Counter aktualisieren
num_copied_items++;
dev->items--;
}
return num_copied_items;
}
static size_t decode_sequence(const char *coded, char *plain) {
assert(coded && plain);
plain[0] = '\0';
for (int block = 0; block < 8; block++) {
int offset = get_offset(block);
int octet = get_octet(block);
int c = decode_char(coded[block]);
if (c < 0) {
return (size_t)octet;
}
plain[octet] |= shift_left(c, offset);
if (offset < 0) {
assert(octet < 4);
plain[octet + 1] = shift_left(c, 8 + offset);
}
}
return 5;
}
void decode_buffer(unsigned char *buffer){
printf("Start decoding the packet!!\n");
unsigned int ans = decode_int(buffer);
buffer +=4;
//unsigned int langth = decode_int(buffer);
unsigned char *str = malloc(sizeof(char) * NAMELENGTH);
str = decode_char(buffer);
printf("decoded buffer is: %s, %d\n", str, ans);
while(send_ack(1, -1) < 0){
printf("failed ack\n");
}
connection = 1;
return;
}
// implementation of what happens when someone now wants to read
// into our device. we got much help form others groups here.
// this is very similar to the write process
ssize_t translate_read(struct file *filp, char __user *buf,
size_t count,loff_t *f_pos) {
struct translate_dev *dev = filp->private_data;
int num_copied_items = 0;
int p_reader = (dev->read_pos - dev->buffer) / sizeof(char);
DEBUG(printk(KERN_NOTICE "translate_read()\n"));
while (num_copied_items < count) {
if (dev->items == 0) {
DEBUG(printk(KERN_NOTICE "translate_read: buffer empty, read %d chars \n",num_copied_items));
return num_copied_items;
}
// because we're got the information now and the user want to read them
// we'll decode our buffer (if translate1) and THEN hand it over to the user.
// if the device is translate1, then decode
if (MINOR(dev->cdev.dev) == (MINOR_BEGINNING + 1)) {
decode_char(dev->read_pos);
}
if (copy_to_user(buf, dev->read_pos, 1)) {
return -EFAULT;
}
// update pointers
dev->read_pos = dev->buffer + ((p_reader + 1) % translate_bufsize)* sizeof(char);
p_reader = (dev->read_pos - dev->buffer) / sizeof(char);
buf += sizeof(char);
// update counters
num_copied_items++;
dev->items--;
}
return num_copied_items;
}