zip-reader.odin

read_zip :: proc(reader: ^io.Reader) {
    LOCAL_FILE_MAGIC        :: 0x04034B50;
    END_MAGIC               :: 0x06054b50;

    Local_File_Header :: struct #packed {
        //signature:          u32le,
        minimum_version:    u16le,
        flags:              u16le,
        compression:        u16le,
        last_mod_time:      u16le,
        last_mod_date:      u16le,
        crc32:              u32le,
        compressed_size:    u32le,
        uncompressed_size:  u32le,
        name_length:        u16le,
        extra_field_length: u16le,
        // name:        [name_length]u8
        // extra_field: [extra_field_length]u8
    };

    End_Of_Central_Record :: struct #packed {
        //signature: u32le,
        number_of_this_disk: u16le,
        number_of_disk_with_start_of_central: u16le,
        total_entries_on_this_disk: u16le,
        total_entries: u16le,
        size_of_central_dir: u32le,
        offset_of_central: u32le,
        zip_file_comment_length: u16le,
        // zip_file_comment: [zip_file_comment_length]u8
    };

    loop:
    for {
        signature, err := io.read_u32le(reader);

        switch signature {
        case LOCAL_FILE_MAGIC:
            file, ferr := io.read_typeid(reader, Local_File_Header);
            buffer := make([]u8, file.name_length);
            n, err := io.read(reader, buffer);
            name := string(buffer);
            fmt.printf("file: %v, size: %d\n", name, file.compressed_size);

            data := make([]u8, file.compressed_size);
            io.read(reader, data);
            delete(data);

        case END_MAGIC:
            break loop;
        case:
            fmt.printf("Unexpected signature 0x%04X\n", signature);
            break loop;
        }
    }
}