/
PackageFile.cpp
216 lines (164 loc) · 4.18 KB
/
PackageFile.cpp
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/*
* Copyright 2009-2013, Ingo Weinhold, ingo_weinhold@gmx.de.
* Distributed under the terms of the MIT License.
*/
#include "PackageFile.h"
#include <algorithm>
#include <new>
#include <fs_cache.h>
#include <AutoDeleter.h>
#include <util/AutoLock.h>
#include <package/hpkg/BufferDataOutput.h>
#include <package/hpkg/DataReader.h>
#include <package/hpkg/PackageDataReader.h>
#include "DebugSupport.h"
#include "GlobalFactory.h"
#include "Package.h"
using namespace BPackageKit::BHPKG;
// #pragma mark - DataAccessor
struct PackageFile::IORequestOutput : BDataIO {
public:
IORequestOutput(io_request* request)
:
fRequest(request)
{
}
virtual ssize_t Write(const void* buffer, size_t size)
{
RETURN_ERROR(write_to_io_request(fRequest, buffer, size));
}
virtual ssize_t Read(void* buffer, size_t size)
{
return B_NOT_SUPPORTED;
}
private:
io_request* fRequest;
};
struct PackageFile::DataAccessor {
DataAccessor(Package* package, PackageData* data)
:
fPackage(package),
fData(data),
fReader(NULL),
fFileCache(NULL)
{
mutex_init(&fLock, "file data accessor");
}
~DataAccessor()
{
file_cache_delete(fFileCache);
delete fReader;
mutex_destroy(&fLock);
}
status_t Init(dev_t deviceID, ino_t nodeID, int fd)
{
// create a reader for the data
status_t error = fPackage->CreateDataReader(*fData, fReader);
if (error != B_OK)
return error;
// create a file cache
fFileCache = file_cache_create(deviceID, nodeID,
fData->UncompressedSize());
if (fFileCache == NULL)
RETURN_ERROR(B_NO_MEMORY);
return B_OK;
}
status_t ReadData(off_t offset, void* buffer, size_t* bufferSize)
{
if (offset < 0 || (uint64)offset > fData->UncompressedSize())
return B_BAD_VALUE;
*bufferSize = std::min((uint64)*bufferSize,
fData->UncompressedSize() - offset);
return file_cache_read(fFileCache, NULL, offset, buffer, bufferSize);
}
status_t ReadData(io_request* request)
{
off_t offset = io_request_offset(request);
size_t size = io_request_length(request);
if (offset < 0 || (uint64)offset > fData->UncompressedSize())
RETURN_ERROR(B_BAD_VALUE);
size_t toRead = std::min((uint64)size,
fData->UncompressedSize() - offset);
if (toRead > 0) {
IORequestOutput output(request);
MutexLocker locker(fLock, false, fData->Version() == 1);
// V2 readers are reentrant
status_t error = fReader->ReadDataToOutput(offset, toRead, &output);
if (error != B_OK)
RETURN_ERROR(error);
}
return B_OK;
}
private:
mutex fLock;
Package* fPackage;
PackageData* fData;
BAbstractBufferedDataReader* fReader;
void* fFileCache;
};
// #pragma mark - PackageFile
PackageFile::PackageFile(Package* package, mode_t mode, const PackageData& data)
:
PackageLeafNode(package, mode),
fData(data),
fDataAccessor(NULL)
{
}
PackageFile::~PackageFile()
{
}
status_t
PackageFile::VFSInit(dev_t deviceID, ino_t nodeID)
{
status_t error = PackageNode::VFSInit(deviceID, nodeID);
if (error != B_OK)
return error;
MethodDeleter<PackageNode> baseClassUninit(this,
&PackageNode::NonVirtualVFSUninit);
// open the package -- that's already done by PackageNode::VFSInit(), so it
// shouldn't fail here. We only need to do it again, since we need the FD.
int fd = fPackage->Open();
if (fd < 0)
RETURN_ERROR(fd);
PackageCloser packageCloser(fPackage);
// create the data accessor
fDataAccessor = new(std::nothrow) DataAccessor(GetPackage(), &fData);
if (fDataAccessor == NULL)
RETURN_ERROR(B_NO_MEMORY);
error = fDataAccessor->Init(deviceID, nodeID, fd);
if (error != B_OK) {
delete fDataAccessor;
fDataAccessor = NULL;
return error;
}
baseClassUninit.Detach();
return B_OK;
}
void
PackageFile::VFSUninit()
{
if (fDataAccessor != NULL) {
delete fDataAccessor;
fDataAccessor = NULL;
}
PackageNode::VFSUninit();
}
off_t
PackageFile::FileSize() const
{
return fData.UncompressedSize();
}
status_t
PackageFile::Read(off_t offset, void* buffer, size_t* bufferSize)
{
if (fDataAccessor == NULL)
return B_BAD_VALUE;
return fDataAccessor->ReadData(offset, buffer, bufferSize);
}
status_t
PackageFile::Read(io_request* request)
{
if (fDataAccessor == NULL)
return B_BAD_VALUE;
return fDataAccessor->ReadData(request);
}