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149 řádky
3.6 KiB
149 řádky
3.6 KiB
#pragma once
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#include "gp/array.hpp"
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#include "gp/algorithm/move.hpp"
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#include "gp/vfs/fs_types.hpp"
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#include "gp/allocator/aggregator.hpp"
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namespace gp {
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template<typename error_function, typename pop_function>
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class self_filling_channel{
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error_function on_error;
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pop_function filler;
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public:
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gp::buffer<char>::associated_iterator push(gp::buffer<char> input) {
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on_error();
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return input.begin();
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}
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gp::buffer<char>::associated_iterator pop(gp::buffer<char> dest) {
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return filler(dest);
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}
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};
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template<size_t size, size_t count = 1, bool whole_messages = true, bool zero_out = true>
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class channel {
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gp::array<size_t, count> message_sizes;
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gp::array<
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gp::array<char, size>,
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count
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> messages;
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size_t r_offset = 0;
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size_t w_offset = 0;
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[[nodiscard]] size_t write_one(size_t loc, gp::buffer<char> message) {
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auto cond = message.size();
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size_t idx = 0;
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for(; idx < cond; ++idx) {
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messages[loc][idx] = message[idx];
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}
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message_sizes[loc] = message.size();
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w_offset += 1;
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if constexpr (count != 1) w_offset %= size;
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if constexpr (zero_out) {
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auto ret = idx;
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for(; idx < messages[loc].size(); ++idx) {
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messages[loc] = 0;
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}
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return ret;
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}
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return idx;
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}
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[[nodiscard]] size_t read_one(size_t loc, gp::buffer<char> message) {
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size_t ret;
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size_t idx = 0;
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size_t trailer = 0;
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if(message_sizes[loc] < message.size())
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{
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for(; idx < message_sizes[loc]; ++idx) {
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message[idx] = messages[loc][idx];
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}
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r_offset += 1;
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if constexpr (count != 1) w_offset %= size;
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ret = idx;
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} else {
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for(; idx < message.size(); ++idx) {
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message[idx] = messages[loc][idx];
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}
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ret = idx;
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for(; idx < message_sizes[loc]; ++idx, ++trailer)
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{
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message[trailer] = message[idx];
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}
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message_sizes[loc] = trailer;
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}
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if constexpr (zero_out) {
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if(trailer == 0) {
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message_sizes[loc] = 0;
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}
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for(; trailer < messages[loc].size(); ++trailer)
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{
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messages[loc][trailer] = 0;
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}
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}
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return ret;
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}
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public:
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channel() {}
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gp::buffer<char>::associated_iterator push(gp::buffer<char> input) {
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if constexpr (whole_messages) {
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if(input.size() > size) {
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return input.begin();
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}
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}
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if constexpr (count == 1) {
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if(w_offset == r_offset) {
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auto to_write = gp::min(input.size(), size);
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write_one(
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0,
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gp::buffer<char>(input.begin().data, to_write)
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);
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return input.begin()+to_write;
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} else {
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return input.begin();
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}
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} else {
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auto next_w = (w_offset+1)%count;
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auto to_consume = input;
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while(to_consume.size() && (next_w == r_offset)) {
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auto to_write = gp::min(to_consume.size(), size);
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to_write = write_one(
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w_offset,
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to_consume.trim_start(to_write)
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);
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to_consume = to_consume.trim_start(to_write);
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next_w = (w_offset+1)%count;
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}
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return to_consume.begin();
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}
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}
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gp::buffer<char>::associated_iterator pop(gp::buffer<char> dest) {
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if(r_offset == w_offset) {
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return dest.begin();
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}
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size_t idx;
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if constexpr (count == 1) {
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idx = 0;
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} else {
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idx = r_offset;
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}
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if constexpr (whole_messages) {
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if(message_sizes[idx] > dest.size()) {
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return dest.begin();
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}
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auto sz = gp::min(message_sizes[idx], dest.size());
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read_one(idx, gp::buffer<char>(dest.begin(), sz));
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return dest.begin()+sz;
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}
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auto to_fill = dest;
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do{
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auto to_read = gp::min(to_fill.size(), size);
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to_read = read_one(
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r_offset,
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to_fill.trim_start(to_read)
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);
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to_fill = to_fill.trim_start(to_read);
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}while(r_offset != w_offset && to_fill.size());
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return to_fill.begin();
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}
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};
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}
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