forked from OctaForge/libostd
243 lines
5.7 KiB
C++
243 lines
5.7 KiB
C++
/* Generic stream implementation for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OSTD_STREAM_HH
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#define OSTD_STREAM_HH
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#include <sys/types.h>
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#include <type_traits>
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#include "ostd/platform.hh"
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#include "ostd/types.hh"
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#include "ostd/range.hh"
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#include "ostd/string.hh"
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#include "ostd/format.hh"
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namespace ostd {
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#ifndef OSTD_PLATFORM_WIN32
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using stream_off_t = off_t;
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#else
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using stream_off_t = __int64;
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#endif
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enum class stream_seek {
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CUR = SEEK_CUR,
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END = SEEK_END,
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SET = SEEK_SET
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};
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template<typename T = char, bool = std::is_pod_v<T>>
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struct stream_range;
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struct stream {
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using offset_type = stream_off_t;
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virtual ~stream() {}
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virtual void close() = 0;
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virtual bool end() const = 0;
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virtual offset_type size() {
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offset_type p = tell();
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if ((p < 0) || !seek(0, stream_seek::END)) {
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return -1;
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}
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offset_type e = tell();
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return ((p == e) || seek(p, stream_seek::SET)) ? e : -1;
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}
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virtual bool seek(offset_type, stream_seek = stream_seek::SET) {
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return false;
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}
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virtual offset_type tell() const { return -1; }
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virtual bool flush() { return true; }
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virtual size_t read_bytes(void *, size_t) { return 0; }
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virtual size_t write_bytes(void const *, size_t) { return 0; }
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virtual int getchar() {
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byte c;
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return (read_bytes(&c, 1) == 1) ? c : -1;
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}
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virtual bool putchar(int c) {
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byte wc = byte(c);
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return write_bytes(&wc, 1) == 1;
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}
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template<typename T>
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void write(T const &v);
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template<typename T, typename ...A>
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void write(T const &v, A const &...args) {
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write(v);
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write(args...);
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}
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template<typename T>
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void writeln(T const &v) {
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write(v);
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if (!putchar('\n')) {
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/* consistency with format module */
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throw format_error{"stream EOF"};
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}
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}
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template<typename T, typename ...A>
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void writeln(T const &v, A const &...args) {
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write(v);
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write(args...);
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if (!putchar('\n')) {
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throw format_error{"stream EOF"};
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}
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}
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template<typename ...A>
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void writef(string_range fmt, A const &...args);
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template<typename ...A>
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void writefln(string_range fmt, A const &...args) {
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writef(fmt, args...);
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if (!putchar('\n')) {
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throw format_error{"stream EOF"};
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}
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}
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template<typename T = char>
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stream_range<T> iter();
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template<typename T>
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size_t put(T const *v, size_t count) {
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return write_bytes(v, count * sizeof(T)) / sizeof(T);
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}
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template<typename T>
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bool put(T v) {
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return write_bytes(&v, sizeof(T)) == sizeof(T);
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}
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template<typename T>
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size_t get(T *v, size_t count) {
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return read_bytes(v, count * sizeof(T)) / sizeof(T);
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}
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template<typename T>
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bool get(T &v) {
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return read_bytes(&v, sizeof(T)) == sizeof(T);
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}
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template<typename T>
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T get() {
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T r;
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return get(r) ? r : T();
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}
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};
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template<typename T>
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size_t range_put_n(stream_range<T> &range, T const *p, size_t n);
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template<typename T>
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struct stream_range<T, true>: input_range<stream_range<T>> {
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using range_category = input_range_tag;
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using value_type = T;
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using reference = T;
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using size_type = size_t;
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using difference_type = stream_off_t;
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template<typename TT>
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friend size_t range_put_n(stream_range<TT> &range, TT const *p, size_t n);
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stream_range() = delete;
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stream_range(stream &s): p_stream(&s), p_size(s.size()) {}
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stream_range(stream_range const &r): p_stream(r.p_stream), p_size(r.p_size) {}
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bool empty() const {
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return (p_size - p_stream->tell()) < stream_off_t(sizeof(T));
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}
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bool pop_front() {
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if (empty()) {
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return false;
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}
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T val;
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return !!p_stream->read_bytes(&val, sizeof(T));
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}
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T front() const {
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T val;
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p_stream->seek(-p_stream->read_bytes(&val, sizeof(T)), stream_seek::CUR);
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return val;
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}
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bool equals_front(stream_range const &s) const {
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return p_stream->tell() == s.p_stream->tell();
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}
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bool put(T val) {
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size_t v = p_stream->write_bytes(&val, sizeof(T));
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p_size += v;
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return (v == sizeof(T));
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}
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size_t copy(std::remove_cv_t<T> *p, size_t n = -1) {
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if (n == size_t(-1)) {
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n = p_stream->size() / sizeof(T);
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}
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return p_stream->get(p, n);
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}
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private:
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stream *p_stream;
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stream_off_t p_size;
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};
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template<typename T>
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inline size_t range_put_n(stream_range<T> &range, T const *p, size_t n) {
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return range.p_stream->put(p, n);
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}
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template<typename T>
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inline stream_range<T> stream::iter() {
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return stream_range<T>(*this);
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}
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namespace detail {
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/* lightweight output range for write/writef on streams */
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struct fmt_stream_range: output_range<fmt_stream_range> {
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using value_type = char;
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using reference = char &;
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using size_type = size_t;
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using difference_type = ptrdiff_t;
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fmt_stream_range(stream &s): p_s(s) {}
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bool put(char c) {
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return p_s.write_bytes(&c, 1) == 1;
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}
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stream &p_s;
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};
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inline size_t range_put_n(fmt_stream_range &range, char const *p, size_t n) {
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return range.p_s.write_bytes(p, n);
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}
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}
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template<typename T>
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inline void stream::write(T const &v) {
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format(detail::fmt_stream_range{*this}, format_spec{'s'}, v);
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}
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template<typename ...A>
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inline void stream::writef(string_range fmt, A const &...args) {
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format(detail::fmt_stream_range{*this}, fmt, args...);
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}
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}
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#endif
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