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82 lines
1.9 KiB
C++
82 lines
1.9 KiB
C++
#pragma once
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#include <unistd.h>
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#include <stdio.h>
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#include <memory>
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class stream;
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FILE *open_stream(stream *strm);
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template <class T, class... Args>
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FILE *open_stream(Args &&... args) {
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return open_stream(new T(args...));
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}
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class stream {
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public:
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virtual int read(void *buf, size_t len);
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virtual int write(const void *buf, size_t len);
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virtual off_t seek(off_t off, int whence);
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virtual ~stream() = default;
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};
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// Delegates all operations to the base FILE pointer
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class filter_stream : public stream {
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public:
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filter_stream(FILE *fp) : fp(fp) {}
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~filter_stream() override;
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int read(void *buf, size_t len) override;
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int write(const void *buf, size_t len) override;
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void set_base(FILE *f);
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template <class T, class... Args >
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void set_base(Args&&... args) {
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set_base(open_stream<T>(args...));
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}
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protected:
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FILE *fp;
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};
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// Handy interface for classes that need custom seek logic
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class seekable_stream : public stream {
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protected:
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size_t _pos = 0;
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off_t seek_pos(off_t off, int whence);
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virtual size_t end_pos() = 0;
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};
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// Byte stream that dynamically allocates memory
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class byte_stream : public seekable_stream {
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public:
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byte_stream(uint8_t *&buf, size_t &len);
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template <class byte>
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byte_stream(byte *&buf, size_t &len) : byte_stream(reinterpret_cast<uint8_t *&>(buf), len) {}
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int read(void *buf, size_t len) override;
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int write(const void *buf, size_t len) override;
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off_t seek(off_t off, int whence) override;
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private:
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uint8_t *&_buf;
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size_t &_len;
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size_t _cap = 0;
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void resize(size_t new_pos, bool zero = false);
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size_t end_pos() override { return _len; }
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};
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// File stream but does not close the file descriptor at any time
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class fd_stream : public stream {
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public:
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fd_stream(int fd) : fd(fd) {}
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int read(void *buf, size_t len) override;
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int write(const void *buf, size_t len) override;
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off_t seek(off_t off, int whence) override;
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private:
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int fd;
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};
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