sigmasternchen/libsfuid
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made decoding much faster

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It's still pretty slow though. I assume because of the pow operation. I'll take a look at it later.
This commit is contained in:
overflowerror 2019-01-21 13:59:58 +01:00
parent 9822208d98
commit 30648e7b5e
1 changed files with 16 additions and 13 deletions
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29
main.c
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@ -9,7 +9,8 @@
typedef __uint128_t uint128_t;
char* charset = "a-zA-Z0-9";
const char* charset = "a-zA-Z0-9";
int inverseCharset[(1 << 7)] = {-1};
unsigned int resultLength = 10;
unsigned int offset = 5;
bool verbose = false;
@ -49,19 +50,13 @@ unsigned long long convertFromString(const char* string) {
for (int i = 0; i < stringLength; i++) {
bool found = false;
for(int j = 0; j < charsetLength; j++) {
if (charset[j] == string[i]) {
found = true;
unsigned long long val = ((unsigned long long) pow(charsetLength, stringLength - i - 1));
//printf("position %d, digit %d, value %d\n", i, j, val);;
result += ((unsigned long long) j) * val;
break;
}
}
if (!found) {
int tmp = inverseCharset[string[i]];
if (tmp < 0) {
error("Parsing error.\nUnexpected character '%c'.\n", string[i]);
exit(3);
}
unsigned long long val = ((unsigned long long) pow(charsetLength, stringLength - i - 1));
result += ((unsigned long long) tmp) * val;
}
return result;
@ -248,7 +243,7 @@ void prepareCharset() {
verbose("prepareing charset\n");
int size = strlen(charset);
char* tmp;
const char* tmp;
for(int i = 0; i < ((sizeof shortcuts) / (sizeof shortcuts[0])); i++) {
tmp = charset;
@ -268,7 +263,8 @@ void prepareCharset() {
for (int i = 0; i < ((sizeof shortcuts) / (sizeof shortcuts[0])); i++) {
tmp = strstr(inflatedCharset, shortcuts[i].needle);
if ((tmp != NULL) && ((first == NULL) || (tmp < first))) {
first = tmp;
// we declared tmp as const char* but now we are using it for char
first = (char*) tmp;
replace = shortcuts[i].replacement;
}
}
@ -285,6 +281,12 @@ void prepareCharset() {
charset = inflatedCharset;
}
void prepareInverseCharset() {
for(int i = 0; i < strlen(charset); i++) {
inverseCharset[charset[i]] = i;
}
}
void help(const char* name) {
printf("SYNOPSIS: %s [OPTIONS] INPUT\n\n", name);
printf("options: \n");
@ -357,6 +359,7 @@ int main(int argc, char** argv) {
settings_t settings = getSettings();
if (decodeMode) {
prepareInverseCharset();
verbose("decode mode\n");
const char* string = argv[optind];
verbose("string: %s\n", string);