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-rw-r--r--widget/nsPrimitiveHelpers.cpp193
1 files changed, 193 insertions, 0 deletions
diff --git a/widget/nsPrimitiveHelpers.cpp b/widget/nsPrimitiveHelpers.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * 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/. */
+
+//
+// Part of the reason these routines are all in once place is so that as new
+// data flavors are added that are known to be one-byte or two-byte strings, or
+// even raw binary data, then we just have to go to one place to change how the
+// data moves into/out of the primitives and native line endings.
+//
+// If you add new flavors that have special consideration (binary data or
+// one-byte char* strings), please update all the helper classes in this file.
+//
+// For now, this is the assumption that we are making:
+// - text/plain is always a char*
+// - anything else is a char16_t*
+//
+
+#include "nsPrimitiveHelpers.h"
+
+#include "mozilla/UniquePtr.h"
+#include "nsComponentManagerUtils.h"
+#include "nsCOMPtr.h"
+#include "nsXPCOM.h"
+#include "nsISupportsPrimitives.h"
+#include "nsITransferable.h"
+#include "nsLinebreakConverter.h"
+#include "nsReadableUtils.h"
+
+//
+// CreatePrimitiveForData
+//
+// Given some data and the flavor it corresponds to, creates the appropriate
+// nsISupports* wrapper for passing across IDL boundaries. Right now, everything
+// creates a two-byte |nsISupportsString|, except for "text/plain" and native
+// platform HTML (CF_HTML on win32)
+//
+void nsPrimitiveHelpers ::CreatePrimitiveForData(const nsACString& aFlavor,
+ const void* aDataBuff,
+ uint32_t aDataLen,
+ nsISupports** aPrimitive) {
+ if (!aPrimitive) return;
+
+ if (aFlavor.EqualsLiteral(kNativeHTMLMime) ||
+ aFlavor.EqualsLiteral(kRTFMime) ||
+ aFlavor.EqualsLiteral(kCustomTypesMime)) {
+ nsCOMPtr<nsISupportsCString> primitive =
+ do_CreateInstance(NS_SUPPORTS_CSTRING_CONTRACTID);
+ if (primitive) {
+ const char* start = reinterpret_cast<const char*>(aDataBuff);
+ primitive->SetData(Substring(start, start + aDataLen));
+ NS_ADDREF(*aPrimitive = primitive);
+ }
+ } else {
+ nsCOMPtr<nsISupportsString> primitive =
+ do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID);
+ if (primitive) {
+ if (aDataLen % 2) {
+ auto buffer = mozilla::MakeUnique<char[]>(aDataLen + 1);
+ if (!MOZ_LIKELY(buffer)) return;
+
+ memcpy(buffer.get(), aDataBuff, aDataLen);
+ buffer[aDataLen] = 0;
+ const char16_t* start = reinterpret_cast<const char16_t*>(buffer.get());
+ // recall that length takes length as characters, not bytes
+ primitive->SetData(Substring(start, start + (aDataLen + 1) / 2));
+ } else {
+ const char16_t* start = reinterpret_cast<const char16_t*>(aDataBuff);
+ // recall that length takes length as characters, not bytes
+ primitive->SetData(Substring(start, start + (aDataLen / 2)));
+ }
+ NS_ADDREF(*aPrimitive = primitive);
+ }
+ }
+
+} // CreatePrimitiveForData
+
+//
+// CreatePrimitiveForCFHTML
+//
+// Platform specific CreatePrimitive, windows CF_HTML.
+//
+void nsPrimitiveHelpers ::CreatePrimitiveForCFHTML(const void* aDataBuff,
+ uint32_t* aDataLen,
+ nsISupports** aPrimitive) {
+ if (!aPrimitive) return;
+
+ nsCOMPtr<nsISupportsString> primitive =
+ do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID);
+ if (!primitive) return;
+
+ // We need to duplicate the input buffer, since the removal of linebreaks
+ // might reallocte it.
+ void* utf8 = moz_xmalloc(*aDataLen);
+ memcpy(utf8, aDataBuff, *aDataLen);
+ int32_t signedLen = static_cast<int32_t>(*aDataLen);
+ nsLinebreakHelpers::ConvertPlatformToDOMLinebreaks(true, &utf8, &signedLen);
+ *aDataLen = signedLen;
+
+ nsAutoString str(
+ NS_ConvertUTF8toUTF16(reinterpret_cast<const char*>(utf8), *aDataLen));
+ free(utf8);
+ *aDataLen = str.Length() * sizeof(char16_t);
+ primitive->SetData(str);
+ NS_ADDREF(*aPrimitive = primitive);
+}
+
+//
+// CreateDataFromPrimitive
+//
+// Given a nsISupports* primitive and the flavor it represents, creates a new
+// data buffer with the data in it. This data will be null terminated, but the
+// length parameter does not reflect that.
+//
+void nsPrimitiveHelpers::CreateDataFromPrimitive(const nsACString& aFlavor,
+ nsISupports* aPrimitive,
+ void** aDataBuff,
+ uint32_t* aDataLen) {
+ if (!aDataBuff) return;
+
+ *aDataBuff = nullptr;
+ *aDataLen = 0;
+
+ if (aFlavor.EqualsLiteral(kCustomTypesMime)) {
+ nsCOMPtr<nsISupportsCString> plainText(do_QueryInterface(aPrimitive));
+ if (plainText) {
+ nsAutoCString data;
+ plainText->GetData(data);
+ *aDataBuff = ToNewCString(data);
+ *aDataLen = data.Length() * sizeof(char);
+ }
+ } else {
+ nsCOMPtr<nsISupportsString> doubleByteText(do_QueryInterface(aPrimitive));
+ if (doubleByteText) {
+ nsAutoString data;
+ doubleByteText->GetData(data);
+ *aDataBuff = ToNewUnicode(data);
+ *aDataLen = data.Length() * sizeof(char16_t);
+ }
+ }
+}
+
+//
+// ConvertPlatformToDOMLinebreaks
+//
+// Given some data, convert from the platform linebreaks into the LF expected by
+// the DOM. This will attempt to convert the data in place, but the buffer may
+// still need to be reallocated regardless (disposing the old buffer is taken
+// care of internally, see the note below).
+//
+// NOTE: this assumes that it can use 'free' to dispose of the old buffer.
+//
+nsresult nsLinebreakHelpers ::ConvertPlatformToDOMLinebreaks(
+ bool aIsSingleByteChars, void** ioData, int32_t* ioLengthInBytes) {
+ NS_ASSERTION(ioData && *ioData && ioLengthInBytes, "Bad Params");
+ if (!(ioData && *ioData && ioLengthInBytes)) return NS_ERROR_INVALID_ARG;
+
+ nsresult retVal = NS_OK;
+
+ // RTF and CF_HTML on Windows are transfered as single-byte characters.
+ if (aIsSingleByteChars) {
+ char* buffAsChars = reinterpret_cast<char*>(*ioData);
+ char* oldBuffer = buffAsChars;
+ retVal = nsLinebreakConverter::ConvertLineBreaksInSitu(
+ &buffAsChars, nsLinebreakConverter::eLinebreakAny,
+ nsLinebreakConverter::eLinebreakContent, *ioLengthInBytes,
+ ioLengthInBytes);
+ if (NS_SUCCEEDED(retVal)) {
+ if (buffAsChars != oldBuffer) // check if buffer was reallocated
+ free(oldBuffer);
+ *ioData = buffAsChars;
+ }
+ } else {
+ char16_t* buffAsUnichar = reinterpret_cast<char16_t*>(*ioData);
+ char16_t* oldBuffer = buffAsUnichar;
+ int32_t newLengthInChars;
+ retVal = nsLinebreakConverter::ConvertUnicharLineBreaksInSitu(
+ &buffAsUnichar, nsLinebreakConverter::eLinebreakAny,
+ nsLinebreakConverter::eLinebreakContent,
+ *ioLengthInBytes / sizeof(char16_t), &newLengthInChars);
+ if (NS_SUCCEEDED(retVal)) {
+ if (buffAsUnichar != oldBuffer) // check if buffer was reallocated
+ free(oldBuffer);
+ *ioData = buffAsUnichar;
+ *ioLengthInBytes = newLengthInChars * sizeof(char16_t);
+ }
+ }
+
+ return retVal;
+
+} // ConvertPlatformToDOMLinebreaks