String NetworkCacheKey::hashAsString() const
{
StringBuilder builder;
builder.reserveCapacity(hashStringLength());
for (auto byte : m_hash) {
builder.append(upperNibbleToASCIIHexDigit(byte));
builder.append(lowerNibbleToASCIIHexDigit(byte));
}
return builder.toString();
}
void quotedPrintableEncode(const char* input, size_t inputLength, Vector<char>& out)
{
out.clear();
out.reserveCapacity(inputLength);
size_t currentLineLength = 0;
for (size_t i = 0; i < inputLength; ++i) {
bool isLastCharacter = (i == inputLength - 1);
char currentCharacter = input[i];
bool requiresEncoding = false;
// All non-printable ASCII characters and = require encoding.
if ((currentCharacter < ' ' || currentCharacter > '~' || currentCharacter == '=') && currentCharacter != '\t')
requiresEncoding = true;
// Space and tab characters have to be encoded if they appear at the end of a line.
if (!requiresEncoding && (currentCharacter == '\t' || currentCharacter == ' ') && (isLastCharacter || lengthOfLineEndingAtIndex(input, inputLength, i + 1)))
requiresEncoding = true;
// End of line should be converted to CR-LF sequences.
if (!isLastCharacter) {
size_t lengthOfLineEnding = lengthOfLineEndingAtIndex(input, inputLength, i);
if (lengthOfLineEnding) {
out.append(crlfLineEnding, strlen(crlfLineEnding));
currentLineLength = 0;
i += (lengthOfLineEnding - 1); // -1 because we'll ++ in the for() above.
continue;
}
}
size_t lengthOfEncodedCharacter = 1;
if (requiresEncoding)
lengthOfEncodedCharacter += 2;
if (!isLastCharacter)
lengthOfEncodedCharacter += 1; // + 1 for the = (soft line break).
// Insert a soft line break if necessary.
if (currentLineLength + lengthOfEncodedCharacter > maximumLineLength) {
out.append('=');
out.append(crlfLineEnding, strlen(crlfLineEnding));
currentLineLength = 0;
}
// Finally, insert the actual character(s).
if (requiresEncoding) {
out.append('=');
out.append(upperNibbleToASCIIHexDigit(currentCharacter));
out.append(lowerNibbleToASCIIHexDigit(currentCharacter));
currentLineLength += 3;
} else {
out.append(currentCharacter);
currentLineLength++;
}
}
}
static String generateRandomBoundary()
{
// Trying to generate random boundaries similar to IE/UnMHT (ex: ----=_NextPart_000_001B_01CC157B.96F808A0).
const size_t randomValuesLength = 10;
char randomValues[randomValuesLength];
cryptographicallyRandomValues(&randomValues, randomValuesLength);
StringBuilder stringBuilder;
stringBuilder.append("----=_NextPart_000_");
for (size_t i = 0; i < randomValuesLength; ++i) {
if (i == 2)
stringBuilder.append('_');
else if (i == 6)
stringBuilder.append('.');
stringBuilder.append(lowerNibbleToASCIIHexDigit(randomValues[i]));
stringBuilder.append(upperNibbleToASCIIHexDigit(randomValues[i]));
}
return stringBuilder.toString();
}
