nod/lib/FileIOFILE.cpp

186 lines
5.6 KiB
C++

#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include "NOD/Util.hpp"
#include "NOD/IFileIO.hpp"
namespace NOD
{
class FileIOFILE : public IFileIO
{
SystemString m_path;
int64_t m_maxWriteSize;
public:
FileIOFILE(const SystemString& path, int64_t maxWriteSize)
: m_path(path), m_maxWriteSize(maxWriteSize) {}
FileIOFILE(const SystemChar* path, int64_t maxWriteSize)
: m_path(path), m_maxWriteSize(maxWriteSize) {}
bool exists()
{
FILE* fp = fopen(m_path.c_str(), "rb");
if (!fp)
return false;
fclose(fp);
return true;
}
uint64_t size()
{
FILE* fp = fopen(m_path.c_str(), "rb");
if (!fp)
return 0;
FSeek(fp, 0, SEEK_END);
uint64_t result = FTell(fp);
fclose(fp);
return result;
}
struct WriteStream : public IFileIO::IWriteStream
{
FILE* fp;
int64_t m_maxWriteSize;
WriteStream(const SystemString& path, int64_t maxWriteSize)
: m_maxWriteSize(maxWriteSize)
{
fp = fopen(path.c_str(), "wb");
if (!fp)
LogModule.report(LogVisor::FatalError, _S("unable to open '%s' for writing"), path.c_str());
}
WriteStream(const SystemString& path, uint64_t offset, int64_t maxWriteSize)
: m_maxWriteSize(maxWriteSize)
{
fp = fopen(path.c_str(), "ab");
if (!fp)
goto FailLoc;
fclose(fp);
fp = fopen(path.c_str(), "r+b");
if (!fp)
goto FailLoc;
FSeek(fp, offset, SEEK_SET);
return;
FailLoc:
LogModule.report(LogVisor::FatalError, _S("unable to open '%s' for writing"), path.c_str());
}
~WriteStream()
{
fclose(fp);
}
uint64_t write(const void* buf, uint64_t length)
{
if (m_maxWriteSize >= 0)
{
if (FTell(fp) + length > m_maxWriteSize)
LogModule.report(LogVisor::FatalError, _S("write operation exceeds file's %" PRIi64 "-byte limit"), m_maxWriteSize);
}
return fwrite(buf, 1, length, fp);
}
uint64_t copyFromDisc(IPartReadStream& discio, uint64_t length)
{
uint64_t read = 0;
uint8_t buf[0x7c00];
while (length)
{
uint64_t thisSz = NOD::min(uint64_t(0x7c00), length);
uint64_t readSz = discio.read(buf, thisSz);
if (thisSz != readSz)
{
LogModule.report(LogVisor::FatalError, "unable to read enough from disc");
return read;
}
if (write(buf, readSz) != readSz)
{
LogModule.report(LogVisor::FatalError, "unable to write in file");
return read;
}
length -= thisSz;
read += thisSz;
}
return read;
}
};
std::unique_ptr<IWriteStream> beginWriteStream() const
{
return std::unique_ptr<IWriteStream>(new WriteStream(m_path, m_maxWriteSize));
}
std::unique_ptr<IWriteStream> beginWriteStream(uint64_t offset) const
{
return std::unique_ptr<IWriteStream>(new WriteStream(m_path, offset, m_maxWriteSize));
}
struct ReadStream : public IFileIO::IReadStream
{
FILE* fp;
ReadStream(const SystemString& path)
{
fp = fopen(path.c_str(), "rb");
if (!fp)
LogModule.report(LogVisor::FatalError, _S("unable to open '%s' for reading"), path.c_str());
}
ReadStream(const SystemString& path, uint64_t offset)
: ReadStream(path)
{
FSeek(fp, offset, SEEK_SET);
}
~ReadStream()
{
fclose(fp);
}
void seek(int64_t offset, int whence)
{
FSeek(fp, offset, whence);
}
int64_t position()
{
return FTell(fp);
}
uint64_t read(void* buf, uint64_t length)
{
return fread(buf, 1, length, fp);
}
uint64_t copyToDisc(IPartWriteStream& discio, uint64_t length)
{
uint64_t written = 0;
uint8_t buf[0x7c00];
while (length)
{
uint64_t thisSz = NOD::min(uint64_t(0x7c00), length);
if (read(buf, thisSz) != thisSz)
{
LogModule.report(LogVisor::FatalError, "unable to read enough from file");
return written;
}
if (discio.write(buf, thisSz) != thisSz)
{
LogModule.report(LogVisor::FatalError, "unable to write enough to disc");
return written;
}
length -= thisSz;
written += thisSz;
}
return written;
}
};
std::unique_ptr<IReadStream> beginReadStream() const
{
return std::unique_ptr<IReadStream>(new ReadStream(m_path));
}
std::unique_ptr<IReadStream> beginReadStream(uint64_t offset) const
{
return std::unique_ptr<IReadStream>(new ReadStream(m_path, offset));
}
};
std::unique_ptr<IFileIO> NewFileIO(const SystemString& path, int64_t maxWriteSize)
{
return std::unique_ptr<IFileIO>(new FileIOFILE(path, maxWriteSize));
}
std::unique_ptr<IFileIO> NewFileIO(const SystemChar* path, int64_t maxWriteSize)
{
return std::unique_ptr<IFileIO>(new FileIOFILE(path, maxWriteSize));
}
}