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static OFStringEncoding
encodingForContentType(OFString *contentType)
{
const char *UTF8String = contentType.UTF8String;
size_t last, length = contentType.UTF8StringLength;
enum {
StateType,
StateBeforeParamName,
StateParamName,
StateParamValueOrQuote,
StateParamValue,
StateParamQuotedValue,
StateAfterParamValue
} state = StateType;
stateType,
stateBeforeParamName,
stateParamName,
stateParamValueOrQuote,
stateParamValue,
stateParamQuotedValue,
stateAfterParamValue
} state = stateType;
OFString *name = nil, *value = nil, *charset = nil;
OFStringEncoding ret;
last = 0;
for (size_t i = 0; i < length; i++) {
switch (state) {
case StateType:
case stateType:
if (UTF8String[i] == ';') {
state = StateBeforeParamName;
state = stateBeforeParamName;
last = i + 1;
}
break;
case StateBeforeParamName:
case stateBeforeParamName:
if (UTF8String[i] == ' ')
last = i + 1;
else {
state = StateParamName;
state = stateParamName;
i--;
}
break;
case StateParamName:
case stateParamName:
if (UTF8String[i] == '=') {
name = [OFString
stringWithUTF8String: UTF8String + last
length: i - last];
state = StateParamValueOrQuote;
state = stateParamValueOrQuote;
last = i + 1;
}
break;
case StateParamValueOrQuote:
case stateParamValueOrQuote:
if (UTF8String[i] == '"') {
state = StateParamQuotedValue;
state = stateParamQuotedValue;
last = i + 1;
} else {
state = StateParamValue;
state = stateParamValue;
i--;
}
break;
case StateParamValue:
case stateParamValue:
if (UTF8String[i] == ';') {
value = [OFString
stringWithUTF8String: UTF8String + last
length: i - last];
value =
value.stringByDeletingTrailingWhitespaces;
if ([name isEqual: @"charset"])
charset = value;
state = StateBeforeParamName;
state = stateBeforeParamName;
last = i + 1;
}
break;
case StateParamQuotedValue:
case stateParamQuotedValue:
if (UTF8String[i] == '"') {
value = [OFString
stringWithUTF8String: UTF8String + last
length: i - last];
if ([name isEqual: @"charset"])
charset = value;
state = StateAfterParamValue;
state = stateAfterParamValue;
}
break;
case StateAfterParamValue:
case stateAfterParamValue:
if (UTF8String[i] == ';') {
state = StateBeforeParamName;
state = stateBeforeParamName;
last = i + 1;
} else if (UTF8String[i] != ' ')
return OFStringEncodingAutodetect;
break;
}
}
if (state == StateParamValue) {
if (state == stateParamValue) {
value = [OFString stringWithUTF8String: UTF8String + last
length: length - last];
value = value.stringByDeletingTrailingWhitespaces;
if ([name isEqual: @"charset"])
charset = value;
}
|