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#ifndef UTIL_READ_COMPRESSED_H
#define UTIL_READ_COMPRESSED_H
#include "exception.hh"
#include "scoped.hh"
#include <cstddef>
#include <stdint.h>
namespace util {
class CompressedException : public Exception {
public:
CompressedException() throw();
virtual ~CompressedException() throw();
};
class GZException : public CompressedException {
public:
GZException() throw();
~GZException() throw();
};
class BZException : public CompressedException {
public:
BZException() throw();
~BZException() throw();
};
class XZException : public CompressedException {
public:
XZException() throw();
~XZException() throw();
};
class ReadCompressed;
class ReadBase {
public:
virtual ~ReadBase() {}
virtual std::size_t Read(void *to, std::size_t amount, ReadCompressed &thunk) = 0;
protected:
static void ReplaceThis(ReadBase *with, ReadCompressed &thunk);
ReadBase *Current(ReadCompressed &thunk);
static uint64_t &ReadCount(ReadCompressed &thunk);
};
class ReadCompressed {
public:
static const std::size_t kMagicSize = 6;
// Must have at least kMagicSize bytes.
static bool DetectCompressedMagic(const void *from);
// Takes ownership of fd.
explicit ReadCompressed(int fd);
// Try to avoid using this. Use the fd instead.
// There is no decompression support for istreams.
explicit ReadCompressed(std::istream &in);
// Must call Reset later.
ReadCompressed();
// Takes ownership of fd.
void Reset(int fd);
// Same advice as the constructor.
void Reset(std::istream &in);
std::size_t Read(void *to, std::size_t amount);
// Repeatedly call read to fill a buffer unless EOF is hit.
// Return number of bytes read.
std::size_t ReadOrEOF(void *const to, std::size_t amount);
uint64_t RawAmount() const { return raw_amount_; }
private:
friend class ReadBase;
scoped_ptr<ReadBase> internal_;
uint64_t raw_amount_;
};
} // namespace util
#endif // UTIL_READ_COMPRESSED_H
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