mirror of
https://github.com/topjohnwu/Magisk.git
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130 lines
3.7 KiB
C++
130 lines
3.7 KiB
C++
#pragma once
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#include <sys/uio.h>
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#include <cstdio>
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#include <memory>
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#include "../files.hpp"
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class stream {
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public:
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virtual ssize_t read(void *buf, size_t len);
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virtual ssize_t readFully(void *buf, size_t len);
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virtual ssize_t readv(const iovec *iov, int iovcnt);
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virtual bool write(const void *buf, size_t len);
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virtual ssize_t writev(const iovec *iov, int iovcnt);
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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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using stream_ptr = std::unique_ptr<stream>;
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// Delegates all operations to base stream
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class filter_stream : public stream {
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public:
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filter_stream(stream_ptr &&base) : base(std::move(base)) {}
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ssize_t read(void *buf, size_t len) override;
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bool write(const void *buf, size_t len) override;
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// Seeking while filtering does not make sense
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off_t seek(off_t off, int whence) final { return stream::seek(off, whence); }
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protected:
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stream_ptr base;
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};
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// Buffered output stream, writing in chunks
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class chunk_out_stream : public filter_stream {
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public:
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chunk_out_stream(stream_ptr &&base, size_t buf_sz, size_t chunk_sz)
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: filter_stream(std::move(base)), chunk_sz(chunk_sz), buf_sz(buf_sz) {}
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chunk_out_stream(stream_ptr &&base, size_t buf_sz = 4096)
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: chunk_out_stream(std::move(base), buf_sz, buf_sz) {}
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~chunk_out_stream() override { delete[] _buf; }
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// Reading does not make sense
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ssize_t read(void *buf, size_t len) final { return stream::read(buf, len); }
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bool write(const void *buf, size_t len) final;
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protected:
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// Classes inheriting this class has to call finalize() in its destructor
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void finalize();
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virtual bool write_chunk(const void *buf, size_t len) = 0;
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size_t chunk_sz;
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private:
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size_t buf_sz;
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size_t buf_off = 0;
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uint8_t *_buf = nullptr;
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};
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// Byte stream that dynamically allocates memory
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class byte_stream : public 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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ssize_t read(void *buf, size_t len) override;
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bool 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 _pos = 0;
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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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};
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class file_stream : public stream {
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public:
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bool write(const void *buf, size_t len) final;
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protected:
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virtual ssize_t do_write(const void *buf, size_t len) = 0;
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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 file_stream {
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public:
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fd_stream(int fd) : fd(fd) {}
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ssize_t read(void *buf, size_t len) override;
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ssize_t readv(const iovec *iov, int iovcnt) override;
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ssize_t writev(const iovec *iov, int iovcnt) override;
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off_t seek(off_t off, int whence) override;
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protected:
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ssize_t do_write(const void *buf, size_t len) override;
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private:
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int fd;
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};
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/* ****************************************
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* Bridge between stream class and C stdio
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* ****************************************/
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// sFILE -> stream_ptr
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class fp_stream final : public file_stream {
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public:
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fp_stream(FILE *fp = nullptr) : fp(fp, fclose) {}
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fp_stream(sFILE &&fp) : fp(std::move(fp)) {}
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ssize_t read(void *buf, size_t len) override;
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off_t seek(off_t off, int whence) override;
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protected:
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ssize_t do_write(const void *buf, size_t len) override;
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private:
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sFILE fp;
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};
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// stream_ptr -> sFILE
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sFILE make_stream_fp(stream_ptr &&strm);
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template <class T, class... Args>
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sFILE make_stream_fp(Args &&... args) {
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return make_stream_fp(stream_ptr(new T(std::forward<Args>(args)...)));
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}
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