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util.cpp
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98 lines (86 loc) · 2.04 KB
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#include "util.hpp"
namespace httpsserver {
uint32_t parseUInt(std::string const &s, uint32_t max) {
uint32_t i = 0; // value
// Check sign
size_t x = 0;
if (s[0]=='+') {
x = 1;
}
// We device max by 10, so we can check if we would exceed it by the next *10 multiplication
max/=10;
// Convert by base 10
for(; x < s.size(); x++) {
char c = s[x];
if (i < max) {
if (c >= '0' && c<='9') {
i = i*10 + (c-'0');
} else {
break;
}
} else {
return max;
}
}
return i;
}
int32_t parseInt(std::string const &s) {
uint32_t max = 0x7fffffff;
if (s[0]=='-') {
return -1 * parseUInt(s.substr(1,max));
}
return parseUInt(s,max);
}
std::string intToString(int i) {
if (i==0) {
return "0";
}
// We need this much digits
int digits = ceil(log10(i+1));
char c[digits+1];
c[digits] = '\0';
for(int x = digits-1; x >= 0; x--) {
char v = (i%10);
c[x] = '0' + v;
i = (i-v)/10;
}
return std::string(c);
}
}
std::string urlDecode(std::string input) {
std::size_t idxReplaced = 0;
// First replace + by space
std::size_t idxFound = input.find('+');
while (idxFound != std::string::npos) {
input.replace(idxFound, 1, 1, ' ');
idxFound = input.find('+', idxFound + 1);
}
// Now replace percent-escapes
idxFound = input.find('%');
while (idxFound != std::string::npos) {
if (idxFound <= input.length() + 3) {
char hex[2] = { input[idxFound+1], input[idxFound+2] };
byte val = 0;
for(int n = 0; n < sizeof(hex); n++) {
val <<= 4;
if ('0' <= hex[n] && hex[n] <= '9') {
val += hex[n]-'0';
}
else if ('A' <= hex[n] && hex[n] <= 'F') {
val += hex[n]-'A'+10;
}
else if ('a' <= hex[n] && hex[n] <= 'f') {
val += hex[n]-'a'+10;
}
else {
goto skipChar;
}
}
input.replace(idxFound, 3, 1, (char)val);
}
skipChar:
idxReplaced = idxFound + 1;
idxFound = input.find('%', idxReplaced);
}
return input;
}