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/* vim:set expandtab ts=4 sw=4 sts=4 cin: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsCOMPtr.h"
#include "nsIOutputStream.h"
#include "nsString.h"
#include "nsConverterOutputStream.h"
#include "nsIUnicodeEncoder.h"
#include "mozilla/dom/EncodingUtils.h"
using mozilla::dom::EncodingUtils;
NS_IMPL_ISUPPORTS(nsConverterOutputStream,
nsIUnicharOutputStream,
nsIConverterOutputStream)
nsConverterOutputStream::~nsConverterOutputStream()
{
Close();
}
NS_IMETHODIMP
nsConverterOutputStream::Init(nsIOutputStream* aOutStream,
const char* aCharset,
uint32_t aBufferSize /* ignored */,
char16_t aReplacementChar)
{
NS_PRECONDITION(aOutStream, "Null output stream!");
nsAutoCString label;
if (!aCharset) {
label.AssignLiteral("UTF-8");
} else {
label = aCharset;
}
nsAutoCString encoding;
if (label.EqualsLiteral("UTF-16")) {
// Make sure to output a BOM when UTF-16 requested
encoding.Assign(label);
} else if (!EncodingUtils::FindEncodingForLabelNoReplacement(label,
encoding)) {
return NS_ERROR_UCONV_NOCONV;
}
mConverter = EncodingUtils::EncoderForEncoding(encoding);
mOutStream = aOutStream;
int32_t behaviour = aReplacementChar ? nsIUnicodeEncoder::kOnError_Replace
: nsIUnicodeEncoder::kOnError_Signal;
return mConverter->
SetOutputErrorBehavior(behaviour,
nullptr,
aReplacementChar);
}
NS_IMETHODIMP
nsConverterOutputStream::Write(uint32_t aCount, const char16_t* aChars,
bool* aSuccess)
{
if (!mOutStream) {
NS_ASSERTION(!mConverter, "Closed streams shouldn't have converters");
return NS_BASE_STREAM_CLOSED;
}
NS_ASSERTION(mConverter, "Must have a converter when not closed");
int32_t inLen = aCount;
int32_t maxLen;
nsresult rv = mConverter->GetMaxLength(aChars, inLen, &maxLen);
NS_ENSURE_SUCCESS(rv, rv);
nsAutoCString buf;
buf.SetLength(maxLen);
if (buf.Length() != (uint32_t) maxLen)
return NS_ERROR_OUT_OF_MEMORY;
int32_t outLen = maxLen;
rv = mConverter->Convert(aChars, &inLen, buf.BeginWriting(), &outLen);
if (NS_FAILED(rv))
return rv;
if (rv == NS_ERROR_UENC_NOMAPPING) {
// Yes, NS_ERROR_UENC_NOMAPPING is a success code
return NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;
}
NS_ASSERTION((uint32_t) inLen == aCount,
"Converter didn't consume all the data!");
uint32_t written;
rv = mOutStream->Write(buf.get(), outLen, &written);
*aSuccess = NS_SUCCEEDED(rv) && written == uint32_t(outLen);
return rv;
}
NS_IMETHODIMP
nsConverterOutputStream::WriteString(const nsAString& aString, bool* aSuccess)
{
int32_t inLen = aString.Length();
nsAString::const_iterator i;
aString.BeginReading(i);
return Write(inLen, i.get(), aSuccess);
}
NS_IMETHODIMP
nsConverterOutputStream::Flush()
{
if (!mOutStream)
return NS_OK; // Already closed.
char buf[1024];
int32_t size = sizeof(buf);
nsresult rv = mConverter->Finish(buf, &size);
NS_ASSERTION(rv != NS_OK_UENC_MOREOUTPUT,
"1024 bytes ought to be enough for everyone");
if (NS_FAILED(rv))
return rv;
if (size == 0)
return NS_OK;
uint32_t written;
rv = mOutStream->Write(buf, size, &written);
if (NS_FAILED(rv)) {
NS_WARNING("Flush() lost data!");
return rv;
}
if (written != uint32_t(size)) {
NS_WARNING("Flush() lost data!");
return NS_ERROR_LOSS_OF_SIGNIFICANT_DATA;
}
return rv;
}
NS_IMETHODIMP
nsConverterOutputStream::Close()
{
if (!mOutStream)
return NS_OK; // Already closed.
nsresult rv1 = Flush();
nsresult rv2 = mOutStream->Close();
mOutStream = nullptr;
mConverter = nullptr;
return NS_FAILED(rv1) ? rv1 : rv2;
}
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