diff options
Diffstat (limited to 'FoundationEx/src/reader/file.cpp')
-rw-r--r-- | FoundationEx/src/reader/file.cpp | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/FoundationEx/src/reader/file.cpp b/FoundationEx/src/reader/file.cpp new file mode 100644 index 0000000..f9e9ae2 --- /dev/null +++ b/FoundationEx/src/reader/file.cpp @@ -0,0 +1,129 @@ +/* Starshatter: The Open Source Project + Copyright (c) 2021-2024, Starshatter: The Open Source Project Contributors + Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors + Copyright (c) 1997-2006, Destroyer Studios LLC. +*/ + +#include "file.h" + +#include <algorithm> +#include <fstream> +#include <ios> +#include <limits> +#include <utility> +#include <vector> + +#include <Text.h> + + +namespace starshatter +{ +namespace foundation +{ + + +FileReader::FileReader(std::fstream src) : + file {std::move(src)} +{ + file.seekg(0); + file.ignore(std::numeric_limits<std::streamsize>::max()); + size = file.gcount(); + file.clear(); + file.seekg(0); + position = 0; +} + + +bool +FileReader::valid() const +{ + return static_cast<bool>(file) && file.is_open(); +} + + +Count +FileReader::available() const +{ + return size - position; +} + + +Count +FileReader::seek(Count pos) +{ + position = pos; + if (position > size) + position = size; + file.seekg(position); + return position; +} + + +Count +FileReader::seek(Offset offset, Direction dir) +{ + switch (dir) { + case Direction::Start: + break; // no-op + case Direction::End: + offset = size + offset; + break; + case Direction::Current: + offset = position + offset; + break; + } + if (offset < 0) + offset = 0; + return seek(static_cast<Count>(offset)); +} + + +Count +FileReader::read(char* dest) +{ + return read(dest, available()); +} + + +Count +FileReader::read(char* dest, Count bytes) +{ + bytes = std::min(bytes, available()); + file.read(dest, bytes); + position += bytes; + return bytes; +} + + +Count +FileReader::peek(char* dest) const +{ + return peek(dest, available()); +} + + +Count +FileReader::peek(char* dest, Count bytes) const +{ + bytes = std::min(bytes, available()); + const auto before = file.tellg(); + file.read(dest, bytes); + file.seekg(before); + return bytes; +} + + +Text +FileReader::more() +{ + const auto size = available(); + if (size < 1) + return Text(); + std::vector<char> tmp(size); + read(tmp.data(), size); + return Text(tmp.data(), size); +} + + +} // namespace foundation +} // namespace starshatter |