C++ SharedBuffer::data方法代码示例

status_t String16::insert(size_t pos, const char16_t* chrs, size_t len)
{
    const size_t myLen = size();
    if (myLen == 0) {
        return setTo(chrs, len);
        return NO_ERROR;
    } else if (len == 0) {
        return NO_ERROR;
    }

    if (pos > myLen) pos = myLen;

#if 0
    printf("Insert in to %s: pos=%d, len=%d, myLen=%d, chrs=%s\n",
           String8(*this).string(), pos,
           len, myLen, String8(chrs, len).string());
#endif

    SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
                        ->editResize((myLen+len+1)*sizeof(char16_t));
    if (buf) {
        char16_t* str = (char16_t*)buf->data();
        if (pos < myLen) {
            memmove(str+pos+len, str+pos, (myLen-pos)*sizeof(char16_t));
        }
        memcpy(str+pos, chrs, len*sizeof(char16_t));
        str[myLen+len] = 0;
        mString = str;
#if 0
        printf("Result (%d chrs): %s\n", size(), String8(*this).string());
#endif
        return NO_ERROR;
    }
    return NO_MEMORY;
}

static char16_t* allocFromUTF8(const char* u8str, size_t u8len)
{
    if (u8len == 0) return getEmptyString();

    const uint8_t* u8cur = (const uint8_t*) u8str;

    const ssize_t u16len = utf8_to_utf16_length(u8cur, u8len);
    if (u16len < 0) {
        return getEmptyString();
    }

    SharedBuffer* buf = SharedBuffer::alloc(sizeof(char16_t)*(u16len+1));
    if (buf) {
        u8cur = (const uint8_t*) u8str;
        char16_t* u16str = (char16_t*)buf->data();

        utf8_to_utf16(u8cur, u8len, u16str);

        //printf("Created UTF-16 string from UTF-8 \"%s\":", in);
        //printHexData(1, str, buf->size(), 16, 1);
        //printf("\n");

        return u16str;
    }

    return getEmptyString();
}

void DocumentLoader::substituteResourceDeliveryTimerFired(Timer<DocumentLoader>*)
{
    if (m_pendingSubstituteResources.isEmpty())
        return;
    ASSERT(m_frame && m_frame->page());
    if (m_frame->page()->defersLoading())
        return;

    SubstituteResourceMap copy;
    copy.swap(m_pendingSubstituteResources);

    SubstituteResourceMap::const_iterator end = copy.end();
    for (SubstituteResourceMap::const_iterator it = copy.begin(); it != end; ++it) {
        RefPtr<ResourceLoader> loader = it->first;
        SubstituteResource* resource = it->second.get();
        
        if (resource) {
            SharedBuffer* data = resource->data();
        
            loader->didReceiveResponse(resource->response());
            loader->didReceiveData(data->data(), data->size(), data->size(), true);
            loader->didFinishLoading();
        } else {
            // A null resource means that we should fail the load.
            // FIXME: Maybe we should use another error here - something like "not in cache".
            loader->didFail(loader->cannotShowURLError());
        }
    }
}

SkData* ImageFrameGenerator::refEncodedData()
{
    // SkData is returned only when full image (encoded) data is received. This is important
    // since DeferredImageDecoder::setData is called only once with allDataReceived set to true,
    // and after that m_data->m_readBuffer.data() is not changed. See also RELEASE_ASSERT used in
    // ThreadSafeDataTransport::data().
    SharedBuffer* buffer = 0;
    bool allDataReceived = false;
    m_data->data(&buffer, &allDataReceived);
    if (!allDataReceived)
        return nullptr;

    {
        // Prevents concurrent access to m_encodedData creation.
        MutexLocker lock(m_decodeMutex);
        if (m_encodedData) {
            m_encodedData->ref();
            return m_encodedData;
        }
        // m_encodedData is created with initial reference count == 1. ImageFrameGenerator always holds one
        // reference to m_encodedData, as it prevents write access in SkData::writable_data.
        m_encodedData = SkData::NewWithProc(buffer->data(), buffer->size(), sharedSkDataReleaseCallback, m_data.get());
        // While m_encodedData is referenced, prevent disposing m_data and its content.
        // it is dereferenced in sharedSkDataReleaseCallback, called when m_encodedData gets dereferenced.
        m_data->ref();
    }
    // Increase the reference, caller must decrease it. One reference is always kept by ImageFrameGenerator and released
    // in destructor.
    m_encodedData->ref();
    return m_encodedData;
}

void initialize_string16()
{
    SharedBuffer* buf = SharedBuffer::alloc(sizeof(char16_t));
    char16_t* str = (char16_t*)buf->data();
    *str = 0;
    gEmptyStringBuf = buf;
    gEmptyString = str;
}

size_t getBytesWithOffset(void *info, void* buffer, size_t offset, size_t count)
{
    SharedBuffer* sharedBuffer = static_cast<SharedBuffer*>(info);
    size_t availBytes = count;
    if (offset + count > sharedBuffer->size())
        availBytes -= (offset + count) - sharedBuffer->size();
    memcpy(buffer, sharedBuffer->data() + offset, availBytes);
    return availBytes;
}

void* VectorImpl::editArrayImpl()
{
    if (mStorage) {
        const SharedBuffer* sb = SharedBuffer::bufferFromData(mStorage);
        SharedBuffer* editable = sb->attemptEdit();
        if (editable == 0) {
            // If we're here, we're not the only owner of the buffer.
            // We must make a copy of it.
            editable = SharedBuffer::alloc(sb->size());
            // Fail instead of returning a pointer to storage that's not
            // editable. Otherwise we'd be editing the contents of a buffer
            // for which we're not the only owner, which is undefined behaviour.
            LOG_ALWAYS_FATAL_IF(editable == NULL);
            _do_copy(editable->data(), mStorage, mCount);
            release_storage();
            mStorage = editable->data();
        }
    }
    return mStorage;
}

	char* String8::lockBuffer(size_t size)
	{
		SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
			->editResize(size + 1);
		if (buf) {
			char* str = (char*)buf->data();
			mString = str;
			return str;
		}
		return NULL;
	}

void* BasicHashtableImpl::allocateBuckets(size_t count) const {
    size_t bytes = count * mBucketSize;
    SharedBuffer* sb = SharedBuffer::alloc(bytes);
    LOG_ALWAYS_FATAL_IF(!sb, "Could not allocate %u bytes for hashtable with %u buckets.",
            uint32_t(bytes), uint32_t(count));
    void* buckets = sb->data();
    for (size_t i = 0; i < count; i++) {
        Bucket& bucket = bucketAt(buckets, i);
        bucket.cookie = 0;
    }
    return buckets;
}

SharedBuffer* SharedBuffer::edit() const
{
    if (onlyOwner()) {
        return const_cast<SharedBuffer*>(this);
    }
    SharedBuffer* sb = alloc(mSize);
    if (sb) {
        memcpy(sb->data(), data(), size());
        release();
    }
    return sb;
}

size_t sharedBufferGetBytesAtPosition(void* info, void* buffer, off_t position, size_t count)
{
    SharedBuffer* sharedBuffer = static_cast<SharedBuffer*>(info);
    size_t sourceSize = sharedBuffer->size();
    if (position >= sourceSize)
        return 0;

    const char* source = sharedBuffer->data() + position;
    size_t amount = min<size_t>(count, sourceSize - position);
    memcpy(buffer, source, amount);
    return amount;
}

status_t String16::setTo(const char16_t* other, size_t len)
{
    SharedBuffer* buf = SharedBuffer::bufferFromData(mString)
        ->editResize((len+1)*sizeof(char16_t));
    if (buf) {
        char16_t* str = (char16_t*)buf->data();
        memmove(str, other, len*sizeof(char16_t));
        str[len] = 0;
        mString = str;
        return NO_ERROR;
    }
    return NO_MEMORY;
}

void initialize_string8()
{
#ifdef LIBUTILS_NATIVE
	  // Bite me, Darwin!
		gDarwinIsReallyAnnoying = gDarwinCantLoadAllObjects;
#endif

    SharedBuffer* buf = SharedBuffer::alloc(1);
    char* str = (char*)buf->data();
    *str = 0;
    gEmptyStringBuf = buf;
    gEmptyString = str;
}

std::unique_ptr<FontCustomPlatformData> createFontCustomPlatformData(SharedBuffer& buffer)
{
    static FT_Library library;
    if (!library && FT_Init_FreeType(&library)) {
        library = nullptr;
        return nullptr;
    }

    FT_Face freeTypeFace;
    if (FT_New_Memory_Face(library, reinterpret_cast<const FT_Byte*>(buffer.data()), buffer.size(), 0, &freeTypeFace))
        return nullptr;
    return std::make_unique<FontCustomPlatformData>(freeTypeFace, buffer);
}

static bool canHandleImage(const SharedBuffer& _data)
{
    // We need at least 4 bytes to figure out what kind of image we're dealing with.
    if (_data.size() < 4)
        return false;

    QByteArray data = QByteArray::fromRawData(_data.data(), _data.size());
    QBuffer buffer(&data);
    if (!buffer.open(QBuffer::ReadOnly))
        return false;

    return !QImageReader::imageFormat(&buffer).isEmpty();
}