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/**************************************************************************
*
* Copyright 2011 Zack Rusin
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#ifndef TRACE_FILE_HPP
#define TRACE_FILE_HPP
#include <string>
#include <fstream>
#include <stdint.h>
namespace trace {
class File {
public:
enum Mode {
Read,
Write
};
struct Offset {
Offset(uint64_t _chunk = 0, uint32_t _offsetInChunk = 0)
: chunk(_chunk),
offsetInChunk(_offsetInChunk)
{}
uint64_t chunk;
uint32_t offsetInChunk;
};
public:
static bool isZLibCompressed(const std::string &filename);
static bool isSnappyCompressed(const std::string &filename);
static File *createZLib(void);
static File *createSnappy(void);
static File *createForRead(const char *filename);
static File *createForWrite(const char *filename);
public:
File(const std::string &filename = std::string(),
File::Mode mode = File::Read);
virtual ~File();
bool isOpened() const;
File::Mode mode() const;
bool open(const std::string &filename, File::Mode mode);
bool write(const void *buffer, size_t length);
size_t read(void *buffer, size_t length);
void close();
void flush(void);
int getc();
bool skip(size_t length);
int percentRead();
virtual bool supportsOffsets() const = 0;
virtual File::Offset currentOffset() = 0;
virtual void setCurrentOffset(const File::Offset &offset);
protected:
virtual bool rawOpen(const std::string &filename, File::Mode mode) = 0;
virtual bool rawWrite(const void *buffer, size_t length) = 0;
virtual size_t rawRead(void *buffer, size_t length) = 0;
virtual int rawGetc() = 0;
virtual void rawClose() = 0;
virtual void rawFlush() = 0;
virtual bool rawSkip(size_t length) = 0;
virtual int rawPercentRead() = 0;
protected:
File::Mode m_mode;
bool m_isOpened;
};
inline bool File::isOpened() const
{
return m_isOpened;
}
inline File::Mode File::mode() const
{
return m_mode;
}
inline bool File::open(const std::string &filename, File::Mode mode)
{
if (m_isOpened) {
close();
}
m_isOpened = rawOpen(filename, mode);
m_mode = mode;
return m_isOpened;
}
inline bool File::write(const void *buffer, size_t length)
{
if (!m_isOpened || m_mode != File::Write) {
return false;
}
return rawWrite(buffer, length);
}
inline size_t File::read(void *buffer, size_t length)
{
if (!m_isOpened || m_mode != File::Read) {
return 0;
}
return rawRead(buffer, length);
}
inline int File::percentRead()
{
if (!m_isOpened || m_mode != File::Read) {
return 0;
}
return rawPercentRead();
}
inline void File::close()
{
if (m_isOpened) {
rawClose();
m_isOpened = false;
}
}
inline void File::flush(void)
{
if (m_mode == File::Write) {
rawFlush();
}
}
inline int File::getc()
{
if (!m_isOpened || m_mode != File::Read) {
return -1;
}
return rawGetc();
}
inline bool File::skip(size_t length)
{
if (!m_isOpened || m_mode != File::Read) {
return false;
}
return rawSkip(length);
}
inline bool
operator<(const File::Offset &one, const File::Offset &two)
{
return one.chunk < two.chunk ||
(one.chunk == two.chunk && one.offsetInChunk < two.offsetInChunk);
}
inline bool
operator==(const File::Offset &one, const File::Offset &two)
{
return one.chunk == two.chunk &&
one.offsetInChunk == two.offsetInChunk;
}
inline bool
operator>=(const File::Offset &one, const File::Offset &two)
{
return one.chunk > two.chunk ||
(one.chunk == two.chunk && one.offsetInChunk >= two.offsetInChunk);
}
inline bool
operator>(const File::Offset &one, const File::Offset &two)
{
return two < one;
}
inline bool
operator<=(const File::Offset &one, const File::Offset &two)
{
return two >= one;
}
}
#endif
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