Class BodyReader

3ds/source/transfer.cpp:214–230

ByteReader over the streamed body, positioned at the file part's start. TransferProto::extractZip owns the length accounting.

    // ByteReader over the streamed body, positioned at the file part's start.
    // TransferProto::extractZip owns the length accounting.
    struct BodyReader : TransferProto::ByteReader {
        FSStream input;
        explicit BodyReader(const std::u16string& path, u64 startOffset) : input(Archive::sdmc(), path, FS_OPEN_READ)
        {
            if (input.good()) {
                input.offset((u32)startOffset);
            }
        }
        bool good() { return input.good(); }
        ~BodyReader() override
        {
            if (input.good()) {
                input.close();
            }
        }
        size_t read(void* dst, size_t n) override { return input.good() ? input.read(dst, (u32)n) : 0; }
    };

    // ExtractSink writing under a u16string destination root via FSStream.
    struct FsExtractSink : TransferProto::ExtractSink {