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Set file stream buffers to pre-allocated 1MB chunk on web builds

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This commit is contained in:
Nikita Lisitsa 2026-07-06 22:41:01 +03:00
parent 32bbc93eea
commit ae3b91e7b1
2 changed files with 46 additions and 10 deletions
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36
libs/io/include/psemek/io/file_stream.hpp
View file

@ -4,19 +4,40 @@
#include <filesystem> #include <filesystem>
#include <cstdio> #include <cstdio>
#include <memory>
namespace psemek::io namespace psemek::io
{ {
namespace detail
{
#ifdef __EMSCRIPTEN__
struct buffer_hook
{
static constexpr std::size_t buffer_size = 1 << 20; // 1 MB
std::unique_ptr<char[]> buffer{new char[buffer_size]};
void apply(FILE * file)
{
std::setvbuf(file, buffer.get(), _IOFBF, buffer_size);
}
};
#else
struct buffer_hook
{
void apply(FILE *) {}
};
#endif
}
struct file_istream struct file_istream
: istream : istream
{ {
file_istream() = default; file_istream() = default;
file_istream(FILE * file) file_istream(FILE * file);
: file_{file}
{}
file_istream(std::filesystem::path const & path); file_istream(std::filesystem::path const & path);
file_istream(file_istream && s) file_istream(file_istream && s)
@ -49,6 +70,7 @@ namespace psemek::io
private: private:
FILE * file_ = nullptr; FILE * file_ = nullptr;
[[no_unique_address]] detail::buffer_hook buffer_hook_;
}; };
struct file_ostream struct file_ostream
@ -58,10 +80,7 @@ namespace psemek::io
file_ostream() = default; file_ostream() = default;
file_ostream(FILE * file) file_ostream(FILE * file);
: file_{file}
{}
file_ostream(std::filesystem::path const & path, unsigned flags = 0); file_ostream(std::filesystem::path const & path, unsigned flags = 0);
file_ostream(file_ostream && s) file_ostream(file_ostream && s)
@ -94,6 +113,7 @@ namespace psemek::io
private: private:
FILE * file_ = nullptr; FILE * file_ = nullptr;
[[no_unique_address]] detail::buffer_hook buffer_hook_;
}; };
} }

20
libs/io/source/file_stream.cpp
View file

@ -69,9 +69,17 @@ namespace psemek::io
} }
file_istream::file_istream(FILE * file)
: file_{file}
{
buffer_hook_.apply(file_);
}
file_istream::file_istream(std::filesystem::path const & path) file_istream::file_istream(std::filesystem::path const & path)
: file_{safe_fopen(path, fopen_read_mode())} : file_{safe_fopen(path, fopen_read_mode())}
{} {
buffer_hook_.apply(file_);
}
void file_istream::reset() void file_istream::reset()
{ {
@ -92,9 +100,17 @@ namespace psemek::io
return std::feof(file_) != 0; return std::feof(file_) != 0;
} }
file_ostream::file_ostream(FILE * file)
: file_{file}
{
buffer_hook_.apply(file_);
}
file_ostream::file_ostream(std::filesystem::path const & path, unsigned flags) file_ostream::file_ostream(std::filesystem::path const & path, unsigned flags)
: file_{safe_fopen(path, fopen_write_mode(flags))} : file_{safe_fopen(path, fopen_write_mode(flags))}
{} {
buffer_hook_.apply(file_);
}
void file_ostream::reset() void file_ostream::reset()
{ {