nsresult
FileReader::GetAsText(Blob *aBlob,
const nsACString &aCharset,
const char *aFileData,
uint32_t aDataLen,
nsAString& aResult)
{
// Try the API argument.
const Encoding* encoding = Encoding::ForLabel(aCharset);
if (!encoding) {
// API argument failed. Try the type property of the blob.
nsAutoString type16;
aBlob->GetType(type16);
NS_ConvertUTF16toUTF8 type(type16);
nsAutoCString specifiedCharset;
bool haveCharset;
int32_t charsetStart, charsetEnd;
NS_ExtractCharsetFromContentType(type,
specifiedCharset,
&haveCharset,
&charsetStart,
&charsetEnd);
encoding = Encoding::ForLabel(specifiedCharset);
if (!encoding) {
// Type property failed. Use UTF-8.
encoding = UTF_8_ENCODING;
}
}
auto data = MakeSpan(reinterpret_cast<const uint8_t*>(aFileData),
aDataLen);
nsresult rv;
Tie(rv, encoding) = encoding->Decode(data, aResult);
return NS_FAILED(rv) ? rv : NS_OK;
}
nsresult
FileReader::GetAsText(Blob *aBlob,
const nsACString &aCharset,
const char *aFileData,
uint32_t aDataLen,
nsAString& aResult)
{
// The BOM sniffing is baked into the "decode" part of the Encoding
// Standard, which the File API references.
nsAutoCString encoding;
if (!nsContentUtils::CheckForBOM(
reinterpret_cast<const unsigned char *>(aFileData),
aDataLen,
encoding)) {
// BOM sniffing failed. Try the API argument.
if (!EncodingUtils::FindEncodingForLabel(aCharset,
encoding)) {
// API argument failed. Try the type property of the blob.
nsAutoString type16;
aBlob->GetType(type16);
NS_ConvertUTF16toUTF8 type(type16);
nsAutoCString specifiedCharset;
bool haveCharset;
int32_t charsetStart, charsetEnd;
NS_ExtractCharsetFromContentType(type,
specifiedCharset,
&haveCharset,
&charsetStart,
&charsetEnd);
if (!EncodingUtils::FindEncodingForLabel(specifiedCharset, encoding)) {
// Type property failed. Use UTF-8.
encoding.AssignLiteral("UTF-8");
}
}
}
nsDependentCSubstring data(aFileData, aDataLen);
return nsContentUtils::ConvertStringFromEncoding(encoding, data, aResult);
}
