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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(FILE_READER) || ENABLE(FILE_WRITER)
#include "FileStream.h"
#include "Blob.h"
#include "PlatformString.h"
namespace WebCore {
FileStream::FileStream(FileStreamClient* client)
: m_client(client)
, m_handle(invalidPlatformFileHandle)
, m_bytesProcessed(0)
, m_totalBytesToRead(0)
{
}
FileStream::~FileStream()
{
ASSERT(!isHandleValid(m_handle));
}
void FileStream::start()
{
ASSERT(!isMainThread());
m_client->didStart();
}
void FileStream::stop()
{
ASSERT(!isMainThread());
close();
m_client->didStop();
}
void FileStream::openForRead(Blob* blob)
{
ASSERT(!isMainThread());
if (isHandleValid(m_handle))
return;
// Check if the file exists by querying its modification time. We choose not to call fileExists() in order to save an
// extra file system call when the modification time is needed to check the validity of the sliced file blob.
// Per the spec, we need to return different error codes to differentiate between non-existent file and permission error.
// openFile() could not tell use the failure reason.
time_t currentModificationTime;
if (!getFileModificationTime(blob->path(), currentModificationTime)) {
m_client->didFail(NOT_FOUND_ERR);
return;
}
// Open the file blob.
m_handle = openFile(blob->path(), OpenForRead);
if (!isHandleValid(m_handle)) {
m_client->didFail(NOT_READABLE_ERR);
return;
}
#if ENABLE(BLOB_SLICE)
// Check the modificationt time for the possible file change.
if (blob->modificationTime() != Blob::doNotCheckFileChange && static_cast<time_t>(blob->modificationTime()) != currentModificationTime) {
m_client->didFail(NOT_READABLE_ERR);
return;
}
// Jump to the beginning position if the file has been sliced.
if (blob->start() > 0) {
if (!seekFile(m_handle, blob->start(), SeekFromBeginning)) {
m_client->didFail(NOT_READABLE_ERR);
return;
}
}
#endif
// Get the size.
#if ENABLE(BLOB_SLICE)
m_totalBytesToRead = blob->length();
if (m_totalBytesToRead == Blob::toEndOfFile)
m_totalBytesToRead = blob->size() - blob->start();
#else
m_totalBytesToRead = blob->size();
#endif
m_client->didGetSize(m_totalBytesToRead);
}
void FileStream::openForWrite(const String&)
{
ASSERT(!isMainThread());
// FIXME: to be implemented.
}
void FileStream::close()
{
ASSERT(!isMainThread());
if (isHandleValid(m_handle)) {
closeFile(m_handle);
m_handle = invalidPlatformFileHandle;
}
}
void FileStream::read(char* buffer, int length)
{
ASSERT(!isMainThread());
if (!isHandleValid(m_handle)) {
m_client->didFail(NOT_READABLE_ERR);
return;
}
if (m_bytesProcessed >= m_totalBytesToRead) {
m_client->didFinish();
return;
}
long long remaining = m_totalBytesToRead - m_bytesProcessed;
int bytesToRead = (remaining < length) ? static_cast<int>(remaining) : length;
int bytesRead = readFromFile(m_handle, buffer, bytesToRead);
if (bytesRead < 0) {
m_client->didFail(NOT_READABLE_ERR);
return;
}
if (!bytesRead) {
m_client->didFinish();
return;
}
m_bytesProcessed += bytesRead;
m_client->didRead(buffer, bytesRead);
}
void FileStream::write(Blob*, long long, int)
{
ASSERT(!isMainThread());
// FIXME: to be implemented.
}
void FileStream::truncate(long long)
{
ASSERT(!isMainThread());
// FIXME: to be implemented.
}
} // namespace WebCore
#endif // ENABLE(FILE_READER) || ENABLE(FILE_WRITER)
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