source: webkit/trunk/Source/WebCore/fileapi/FileReaderSync.cpp

/*
 * Copyright (C) 2010 Google Inc.  All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"

#include "FileReaderSync.h"

#include "Blob.h"
#include "BlobURL.h"
#include "FileReaderLoader.h"
#include <JavaScriptCore/ArrayBuffer.h>

namespace WebCore {

FileReaderSync::FileReaderSync()
{
}

ExceptionOr<RefPtr<ArrayBuffer>> FileReaderSync::readAsArrayBuffer(ScriptExecutionContext& scriptExecutionContext, Blob& blob)
{
    FileReaderLoader loader(FileReaderLoader::ReadAsArrayBuffer, nullptr);
    auto result = startLoading(scriptExecutionContext, loader, blob);
    if (result.hasException())
        return result.releaseException();
    return loader.arrayBufferResult();
}

ExceptionOr<String> FileReaderSync::readAsBinaryString(ScriptExecutionContext& scriptExecutionContext, Blob& blob)
{
    FileReaderLoader loader(FileReaderLoader::ReadAsBinaryString, nullptr);
    return startLoadingString(scriptExecutionContext, loader, blob);
}

ExceptionOr<String> FileReaderSync::readAsText(ScriptExecutionContext& scriptExecutionContext, Blob& blob, const String& encoding)
{
    FileReaderLoader loader(FileReaderLoader::ReadAsText, nullptr);
    loader.setEncoding(encoding);
    return startLoadingString(scriptExecutionContext, loader, blob);
}

ExceptionOr<String> FileReaderSync::readAsDataURL(ScriptExecutionContext& scriptExecutionContext, Blob& blob)
{
    FileReaderLoader loader(FileReaderLoader::ReadAsDataURL, nullptr);
    loader.setDataType(blob.type());
    return startLoadingString(scriptExecutionContext, loader, blob);
}

ExceptionOr<void> FileReaderSync::startLoading(ScriptExecutionContext& scriptExecutionContext, FileReaderLoader& loader, Blob& blob)
{
    loader.start(&scriptExecutionContext, blob);
    auto error = loader.errorCode();
    if (!error)
        return { };
    
    return Exception { error.value() };
}

ExceptionOr<String> FileReaderSync::startLoadingString(ScriptExecutionContext& scriptExecutionContext, FileReaderLoader& loader, Blob& blob)
{
    auto result = startLoading(scriptExecutionContext, loader, blob);
    if (result.hasException())
        return result.releaseException();
    return loader.stringResult();
}

} // namespace WebCore