FileReaderLoader.cpp [plain text]
#include "config.h"
#include "FileReaderLoader.h"
#include "Blob.h"
#include "BlobURL.h"
#include "FileReaderLoaderClient.h"
#include "HTTPHeaderNames.h"
#include "ResourceError.h"
#include "ResourceRequest.h"
#include "ResourceResponse.h"
#include "ScriptExecutionContext.h"
#include "TextResourceDecoder.h"
#include "ThreadableBlobRegistry.h"
#include "ThreadableLoader.h"
#include <runtime/ArrayBuffer.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
#include <wtf/text/Base64.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
const int defaultBufferLength = 32768;
FileReaderLoader::FileReaderLoader(ReadType readType, FileReaderLoaderClient* client)
: m_readType(readType)
, m_client(client)
, m_isRawDataConverted(false)
, m_stringResult(emptyString())
, m_variableLength(false)
, m_bytesLoaded(0)
, m_totalBytes(0)
, m_errorCode(0)
{
}
FileReaderLoader::~FileReaderLoader()
{
terminate();
if (!m_urlForReading.isEmpty())
ThreadableBlobRegistry::unregisterBlobURL(m_urlForReading);
}
void FileReaderLoader::start(ScriptExecutionContext* scriptExecutionContext, Blob& blob)
{
m_urlForReading = BlobURL::createPublicURL(scriptExecutionContext->securityOrigin());
if (m_urlForReading.isEmpty()) {
failed(FileError::SECURITY_ERR);
return;
}
ThreadableBlobRegistry::registerBlobURL(scriptExecutionContext->securityOrigin(), m_urlForReading, blob.url());
ResourceRequest request(m_urlForReading);
request.setHTTPMethod("GET");
ThreadableLoaderOptions options;
options.setSendLoadCallbacks(SendCallbacks);
options.setSniffContent(DoNotSniffContent);
options.setDataBufferingPolicy(DoNotBufferData);
options.preflightPolicy = ConsiderPreflight;
options.setAllowCredentials(AllowStoredCredentials);
options.crossOriginRequestPolicy = DenyCrossOriginRequests;
options.contentSecurityPolicyEnforcement = ContentSecurityPolicyEnforcement::DoNotEnforce;
if (m_client)
m_loader = ThreadableLoader::create(scriptExecutionContext, this, request, options);
else
ThreadableLoader::loadResourceSynchronously(scriptExecutionContext, request, *this, options);
}
void FileReaderLoader::cancel()
{
m_errorCode = FileError::ABORT_ERR;
terminate();
}
void FileReaderLoader::terminate()
{
if (m_loader) {
m_loader->cancel();
cleanup();
}
}
void FileReaderLoader::cleanup()
{
m_loader = nullptr;
if (m_errorCode) {
m_rawData = nullptr;
m_stringResult = emptyString();
}
}
void FileReaderLoader::didReceiveResponse(unsigned long, const ResourceResponse& response)
{
if (response.httpStatusCode() != 200) {
failed(httpStatusCodeToErrorCode(response.httpStatusCode()));
return;
}
long long length = response.expectedContentLength();
if (length < 0) {
m_variableLength = true;
length = defaultBufferLength;
}
if (length > std::numeric_limits<unsigned>::max()) {
failed(FileError::NOT_READABLE_ERR);
return;
}
ASSERT(!m_rawData);
m_rawData = ArrayBuffer::tryCreate(static_cast<unsigned>(length), 1);
if (!m_rawData) {
failed(FileError::NOT_READABLE_ERR);
return;
}
m_totalBytes = static_cast<unsigned>(length);
if (m_client)
m_client->didStartLoading();
}
void FileReaderLoader::didReceiveData(const char* data, int dataLength)
{
ASSERT(data);
ASSERT(dataLength > 0);
if (m_errorCode)
return;
int length = dataLength;
unsigned remainingBufferSpace = m_totalBytes - m_bytesLoaded;
if (length > static_cast<long long>(remainingBufferSpace)) {
if (m_totalBytes >= std::numeric_limits<unsigned>::max()) {
failed(FileError::NOT_READABLE_ERR);
return;
}
if (m_variableLength) {
unsigned newLength = m_totalBytes + static_cast<unsigned>(dataLength);
if (newLength < m_totalBytes) {
failed(FileError::NOT_READABLE_ERR);
return;
}
newLength = std::max(newLength, m_totalBytes + m_totalBytes / 4 + 1);
auto newData = ArrayBuffer::tryCreate(newLength, 1);
if (!newData) {
failed(FileError::NOT_READABLE_ERR);
return;
}
memcpy(static_cast<char*>(newData->data()), static_cast<char*>(m_rawData->data()), m_bytesLoaded);
m_rawData = newData;
m_totalBytes = static_cast<unsigned>(newLength);
} else {
length = remainingBufferSpace;
}
}
if (length <= 0)
return;
memcpy(static_cast<char*>(m_rawData->data()) + m_bytesLoaded, data, length);
m_bytesLoaded += length;
m_isRawDataConverted = false;
if (m_client)
m_client->didReceiveData();
}
void FileReaderLoader::didFinishLoading(unsigned long, double)
{
if (m_variableLength && m_totalBytes > m_bytesLoaded) {
RefPtr<ArrayBuffer> newData = m_rawData->slice(0, m_bytesLoaded);
m_rawData = newData;
m_totalBytes = m_bytesLoaded;
}
cleanup();
if (m_client)
m_client->didFinishLoading();
}
void FileReaderLoader::didFail(const ResourceError& error)
{
if (m_errorCode == FileError::ABORT_ERR)
return;
failed(toErrorCode(static_cast<BlobResourceHandle::Error>(error.errorCode())));
}
void FileReaderLoader::failed(int errorCode)
{
m_errorCode = errorCode;
cleanup();
if (m_client)
m_client->didFail(m_errorCode);
}
FileError::ErrorCode FileReaderLoader::toErrorCode(BlobResourceHandle::Error error)
{
switch (error) {
case BlobResourceHandle::Error::NotFoundError:
return FileError::NOT_FOUND_ERR;
default:
return FileError::NOT_READABLE_ERR;
}
}
FileError::ErrorCode FileReaderLoader::httpStatusCodeToErrorCode(int httpStatusCode)
{
switch (httpStatusCode) {
case 403:
return FileError::SECURITY_ERR;
default:
return FileError::NOT_READABLE_ERR;
}
}
RefPtr<ArrayBuffer> FileReaderLoader::arrayBufferResult() const
{
ASSERT(m_readType == ReadAsArrayBuffer);
if (!m_rawData || m_errorCode)
return nullptr;
if (isCompleted())
return m_rawData;
return ArrayBuffer::create(*m_rawData);
}
String FileReaderLoader::stringResult()
{
ASSERT(m_readType != ReadAsArrayBuffer && m_readType != ReadAsBlob);
if (!m_rawData || m_errorCode)
return m_stringResult;
if (m_isRawDataConverted)
return m_stringResult;
switch (m_readType) {
case ReadAsArrayBuffer:
break;
case ReadAsBinaryString:
m_stringResult = String(static_cast<const char*>(m_rawData->data()), m_bytesLoaded);
break;
case ReadAsText:
convertToText();
break;
case ReadAsDataURL:
if (isCompleted())
convertToDataURL();
break;
default:
ASSERT_NOT_REACHED();
}
return m_stringResult;
}
void FileReaderLoader::convertToText()
{
if (!m_bytesLoaded)
return;
if (!m_decoder)
m_decoder = TextResourceDecoder::create("text/plain", m_encoding.isValid() ? m_encoding : UTF8Encoding());
if (isCompleted())
m_stringResult = m_decoder->decodeAndFlush(static_cast<const char*>(m_rawData->data()), m_bytesLoaded);
else
m_stringResult = m_decoder->decode(static_cast<const char*>(m_rawData->data()), m_bytesLoaded);
}
void FileReaderLoader::convertToDataURL()
{
StringBuilder builder;
builder.appendLiteral("data:");
if (!m_bytesLoaded) {
m_stringResult = builder.toString();
return;
}
builder.append(m_dataType);
builder.appendLiteral(";base64,");
Vector<char> out;
base64Encode(m_rawData->data(), m_bytesLoaded, out);
out.append('\0');
builder.append(out.data());
m_stringResult = builder.toString();
}
bool FileReaderLoader::isCompleted() const
{
return m_bytesLoaded == m_totalBytes;
}
void FileReaderLoader::setEncoding(const String& encoding)
{
if (!encoding.isEmpty())
m_encoding = TextEncoding(encoding);
}
}