90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
// File: crn_data_stream.h
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// See Copyright Notice and license at the end of inc/crnlib.h
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#pragma once
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namespace crnlib
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{
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enum data_stream_attribs
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{
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cDataStreamReadable = 1,
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cDataStreamWritable = 2,
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cDataStreamSeekable = 4
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};
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const int64 DATA_STREAM_SIZE_UNKNOWN = cINT64_MAX;
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const int64 DATA_STREAM_SIZE_INFINITE = cUINT64_MAX;
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class data_stream
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{
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data_stream(const data_stream&);
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data_stream& operator= (const data_stream&);
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public:
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data_stream();
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data_stream(const char* pName, uint attribs);
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virtual ~data_stream() { }
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virtual data_stream *get_parent() { return NULL; }
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virtual bool close() { m_opened = false; m_error = false; m_got_cr = false; return true; }
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typedef uint16 attribs_t;
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inline attribs_t get_attribs() const { return m_attribs; }
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inline bool is_opened() const { return m_opened; }
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inline bool is_readable() const { return utils::is_bit_set(m_attribs, cDataStreamReadable); }
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inline bool is_writable() const { return utils::is_bit_set(m_attribs, cDataStreamWritable); }
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inline bool is_seekable() const { return utils::is_bit_set(m_attribs, cDataStreamSeekable); }
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inline bool get_error() const { return m_error; }
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inline const dynamic_string& get_name() const { return m_name; }
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inline void set_name(const char* pName) { m_name.set(pName); }
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virtual uint read(void* pBuf, uint len) = 0;
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virtual uint64 skip(uint64 len);
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virtual uint write(const void* pBuf, uint len) = 0;
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virtual bool flush() = 0;
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virtual bool is_size_known() const { return true; }
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// Returns DATA_STREAM_SIZE_UNKNOWN if size hasn't been determined yet, or DATA_STREAM_SIZE_INFINITE for infinite streams.
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virtual uint64 get_size() = 0;
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virtual uint64 get_remaining() = 0;
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virtual uint64 get_ofs() = 0;
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virtual bool seek(int64 ofs, bool relative) = 0;
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virtual const void* get_ptr() const { return NULL; }
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inline int read_byte() { uint8 c; if (read(&c, 1) != 1) return -1; return c; }
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inline bool write_byte(uint8 c) { return write(&c, 1) == 1; }
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bool read_line(dynamic_string& str);
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bool printf(const char* p, ...);
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bool write_line(const dynamic_string& str);
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bool write_bom() { uint16 bom = 0xFEFF; return write(&bom, sizeof(bom)) == sizeof(bom); }
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bool read_array(vector<uint8>& buf);
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bool write_array(const vector<uint8>& buf);
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protected:
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dynamic_string m_name;
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attribs_t m_attribs;
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bool m_opened : 1;
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bool m_error : 1;
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bool m_got_cr : 1;
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inline void set_error() { m_error = true; }
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inline void clear_error() { m_error = false; }
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inline void post_seek() { m_got_cr = false; }
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};
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} // namespace crnlib
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