Bug 1085696. Part 1 Move widget/xpwidget to /widget. r=roc
This commit is contained in:
Mason Chang
278
widget/nsPrimitiveHelpers.cpp
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278
widget/nsPrimitiveHelpers.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//
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// Part of the reason these routines are all in once place is so that as new
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// data flavors are added that are known to be one-byte or two-byte strings, or even
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// raw binary data, then we just have to go to one place to change how the data
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// moves into/out of the primitives and native line endings.
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//
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// If you add new flavors that have special consideration (binary data or one-byte
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// char* strings), please update all the helper classes in this file.
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//
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// For now, this is the assumption that we are making:
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// - text/plain is always a char*
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// - anything else is a char16_t*
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//
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#include "nsPrimitiveHelpers.h"
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#include "nsCOMPtr.h"
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#include "nsXPCOM.h"
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#include "nsISupportsPrimitives.h"
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#include "nsITransferable.h"
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#include "nsIComponentManager.h"
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#include "nsLinebreakConverter.h"
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#include "nsReadableUtils.h"
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#include "nsIServiceManager.h"
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// unicode conversion
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#include "nsIPlatformCharset.h"
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#include "nsIUnicodeDecoder.h"
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#include "nsISaveAsCharset.h"
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#include "nsAutoPtr.h"
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#include "mozilla/Likely.h"
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#include "mozilla/dom/EncodingUtils.h"
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using mozilla::dom::EncodingUtils;
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//
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// CreatePrimitiveForData
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//
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// Given some data and the flavor it corresponds to, creates the appropriate
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// nsISupports* wrapper for passing across IDL boundaries. Right now, everything
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// creates a two-byte |nsISupportsString|, except for "text/plain" and native
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// platform HTML (CF_HTML on win32)
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//
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void
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nsPrimitiveHelpers :: CreatePrimitiveForData ( const char* aFlavor, const void* aDataBuff,
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uint32_t aDataLen, nsISupports** aPrimitive )
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{
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if ( !aPrimitive )
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return;
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if ( strcmp(aFlavor,kTextMime) == 0 || strcmp(aFlavor,kNativeHTMLMime) == 0 ) {
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nsCOMPtr<nsISupportsCString> primitive =
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do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID);
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if ( primitive ) {
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const char * start = reinterpret_cast<const char*>(aDataBuff);
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primitive->SetData(Substring(start, start + aDataLen));
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NS_ADDREF(*aPrimitive = primitive);
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}
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}
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else {
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nsCOMPtr<nsISupportsString> primitive =
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do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID);
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if (primitive ) {
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if (aDataLen % 2) {
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nsAutoArrayPtr<char> buffer(new char[aDataLen + 1]);
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if (!MOZ_LIKELY(buffer))
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return;
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memcpy(buffer, aDataBuff, aDataLen);
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buffer[aDataLen] = 0;
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const char16_t* start = reinterpret_cast<const char16_t*>(buffer.get());
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// recall that length takes length as characters, not bytes
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primitive->SetData(Substring(start, start + (aDataLen + 1) / 2));
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} else {
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const char16_t* start = reinterpret_cast<const char16_t*>(aDataBuff);
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// recall that length takes length as characters, not bytes
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primitive->SetData(Substring(start, start + (aDataLen / 2)));
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}
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NS_ADDREF(*aPrimitive = primitive);
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}
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}
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} // CreatePrimitiveForData
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//
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// CreateDataFromPrimitive
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//
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// Given a nsISupports* primitive and the flavor it represents, creates a new data
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// buffer with the data in it. This data will be null terminated, but the length
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// parameter does not reflect that.
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//
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void
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nsPrimitiveHelpers :: CreateDataFromPrimitive ( const char* aFlavor, nsISupports* aPrimitive,
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void** aDataBuff, uint32_t aDataLen )
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{
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if ( !aDataBuff )
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return;
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*aDataBuff = nullptr;
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if ( strcmp(aFlavor,kTextMime) == 0 ) {
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nsCOMPtr<nsISupportsCString> plainText ( do_QueryInterface(aPrimitive) );
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if ( plainText ) {
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nsAutoCString data;
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plainText->GetData ( data );
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*aDataBuff = ToNewCString(data);
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}
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}
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else {
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nsCOMPtr<nsISupportsString> doubleByteText ( do_QueryInterface(aPrimitive) );
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if ( doubleByteText ) {
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nsAutoString data;
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doubleByteText->GetData ( data );
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*aDataBuff = ToNewUnicode(data);
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}
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}
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}
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//
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// ConvertUnicodeToPlatformPlainText
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//
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// Given a unicode buffer (flavor text/unicode), this converts it to plain text using
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// the appropriate platform charset encoding. |inUnicodeLen| is the length of the input
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// string, not the # of bytes in the buffer. The |outPlainTextData| is null terminated,
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// but its length parameter, |outPlainTextLen|, does not reflect that.
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//
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nsresult
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nsPrimitiveHelpers :: ConvertUnicodeToPlatformPlainText ( char16_t* inUnicode, int32_t inUnicodeLen,
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char** outPlainTextData, int32_t* outPlainTextLen )
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{
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if ( !outPlainTextData || !outPlainTextLen )
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return NS_ERROR_INVALID_ARG;
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// get the charset
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nsresult rv;
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nsCOMPtr <nsIPlatformCharset> platformCharsetService = do_GetService(NS_PLATFORMCHARSET_CONTRACTID, &rv);
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nsAutoCString platformCharset;
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if (NS_SUCCEEDED(rv))
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rv = platformCharsetService->GetCharset(kPlatformCharsetSel_PlainTextInClipboard, platformCharset);
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if (NS_FAILED(rv))
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platformCharset.AssignLiteral("ISO-8859-1");
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// use transliterate to convert things like smart quotes to normal quotes for plain text
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nsCOMPtr<nsISaveAsCharset> converter = do_CreateInstance("@mozilla.org/intl/saveascharset;1", &rv);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = converter->Init(platformCharset.get(),
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nsISaveAsCharset::attr_EntityAfterCharsetConv +
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nsISaveAsCharset::attr_FallbackQuestionMark,
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nsIEntityConverter::transliterate);
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NS_ENSURE_SUCCESS(rv, rv);
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rv = converter->Convert(inUnicode, outPlainTextData);
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*outPlainTextLen = *outPlainTextData ? strlen(*outPlainTextData) : 0;
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NS_ASSERTION ( NS_SUCCEEDED(rv), "Error converting unicode to plain text" );
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return rv;
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} // ConvertUnicodeToPlatformPlainText
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//
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// ConvertPlatformPlainTextToUnicode
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//
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// Given a char buffer (flavor text/plaikn), this converts it to unicode using
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// the appropriate platform charset encoding. |outUnicode| is null terminated,
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// but its length parameter, |outUnicodeLen|, does not reflect that. |outUnicodeLen| is
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// the length of the string in characters, not bytes.
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//
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nsresult
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nsPrimitiveHelpers :: ConvertPlatformPlainTextToUnicode ( const char* inText, int32_t inTextLen,
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char16_t** outUnicode, int32_t* outUnicodeLen )
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{
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if ( !outUnicode || !outUnicodeLen )
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return NS_ERROR_INVALID_ARG;
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// Get the appropriate unicode decoder. We're guaranteed that this won't change
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// through the life of the app so we can cache it.
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nsresult rv = NS_OK;
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static nsCOMPtr<nsIUnicodeDecoder> decoder;
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static bool hasConverter = false;
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if ( !hasConverter ) {
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// get the charset
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nsAutoCString platformCharset;
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nsCOMPtr <nsIPlatformCharset> platformCharsetService = do_GetService(NS_PLATFORMCHARSET_CONTRACTID, &rv);
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if (NS_SUCCEEDED(rv))
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rv = platformCharsetService->GetCharset(kPlatformCharsetSel_PlainTextInClipboard, platformCharset);
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if (NS_FAILED(rv))
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platformCharset.AssignLiteral("windows-1252");
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decoder = EncodingUtils::DecoderForEncoding(platformCharset);
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hasConverter = true;
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}
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// Estimate out length and allocate the buffer based on a worst-case estimate, then do
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// the conversion.
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decoder->GetMaxLength(inText, inTextLen, outUnicodeLen); // |outUnicodeLen| is number of chars
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if ( *outUnicodeLen ) {
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*outUnicode = reinterpret_cast<char16_t*>(nsMemory::Alloc((*outUnicodeLen + 1) * sizeof(char16_t)));
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if ( *outUnicode ) {
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rv = decoder->Convert(inText, &inTextLen, *outUnicode, outUnicodeLen);
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(*outUnicode)[*outUnicodeLen] = '\0'; // null terminate. Convert() doesn't do it for us
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}
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} // if valid length
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NS_ASSERTION ( NS_SUCCEEDED(rv), "Error converting plain text to unicode" );
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return rv;
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} // ConvertPlatformPlainTextToUnicode
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//
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// ConvertPlatformToDOMLinebreaks
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//
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// Given some data, convert from the platform linebreaks into the LF expected by the
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// DOM. This will attempt to convert the data in place, but the buffer may still need to
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// be reallocated regardless (disposing the old buffer is taken care of internally, see
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// the note below).
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//
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// NOTE: this assumes that it can use nsMemory to dispose of the old buffer.
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//
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nsresult
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nsLinebreakHelpers :: ConvertPlatformToDOMLinebreaks ( const char* inFlavor, void** ioData,
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int32_t* ioLengthInBytes )
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{
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NS_ASSERTION ( ioData && *ioData && ioLengthInBytes, "Bad Params");
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if ( !(ioData && *ioData && ioLengthInBytes) )
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return NS_ERROR_INVALID_ARG;
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nsresult retVal = NS_OK;
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if ( strcmp(inFlavor, "text/plain") == 0 ) {
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char* buffAsChars = reinterpret_cast<char*>(*ioData);
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char* oldBuffer = buffAsChars;
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retVal = nsLinebreakConverter::ConvertLineBreaksInSitu ( &buffAsChars, nsLinebreakConverter::eLinebreakAny,
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nsLinebreakConverter::eLinebreakContent,
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*ioLengthInBytes, ioLengthInBytes );
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if ( NS_SUCCEEDED(retVal) ) {
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if ( buffAsChars != oldBuffer ) // check if buffer was reallocated
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nsMemory::Free ( oldBuffer );
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*ioData = buffAsChars;
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}
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}
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else if ( strcmp(inFlavor, "image/jpeg") == 0 ) {
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// I'd assume we don't want to do anything for binary data....
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}
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else {
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char16_t* buffAsUnichar = reinterpret_cast<char16_t*>(*ioData);
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char16_t* oldBuffer = buffAsUnichar;
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int32_t newLengthInChars;
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retVal = nsLinebreakConverter::ConvertUnicharLineBreaksInSitu ( &buffAsUnichar, nsLinebreakConverter::eLinebreakAny,
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nsLinebreakConverter::eLinebreakContent,
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*ioLengthInBytes / sizeof(char16_t), &newLengthInChars );
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if ( NS_SUCCEEDED(retVal) ) {
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if ( buffAsUnichar != oldBuffer ) // check if buffer was reallocated
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nsMemory::Free ( oldBuffer );
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*ioData = buffAsUnichar;
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*ioLengthInBytes = newLengthInChars * sizeof(char16_t);
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}
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}
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return retVal;
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} // ConvertPlatformToDOMLinebreaks
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