eunzip

% Chunk sizes
-define(zip_chunk_size, 65000).
-define(file_chunk_size, 1024 * 1024).          % 1 MB

% Compression methods
-define(M_STORE, 0).
-define(M_DEFLATE, 8).

% EOCD specific
-define(eocd_search_limit, 5 * 1024 * 1024).    % 5 MB
-define(eocd_header_size, 22).

% Zip64 specific
-define(zip64_eocd_locator_size, 20).
-define(zip64_eocd_size, 56).
-define(zip64_extra_field_id, 16#0001).

% Local header specific
-define(local_header_size, 30).

% Internal structure containing information to seek and read data from files
-record(file_buffer, {
    file :: file:fd(),
    size :: non_neg_integer(),
    limit :: non_neg_integer(),
    buffer :: binary(),
    buffer_size :: non_neg_integer(),
    buffer_position :: non_neg_integer(),
    direction :: eunzip:direction()
}).

% Central directory basic information
-record(cd_info, {
    total_entries :: non_neg_integer(),
    cd_size :: non_neg_integer(),
    cd_offset :: non_neg_integer()
}).

% File / directory entry within a central directory
-record(cd_entry, {
    bit_flag :: non_neg_integer(),
    compression_method :: non_neg_integer(),
    last_modified_datetime :: calendar:datetime(),
    crc :: non_neg_integer(),
    compressed_size :: non_neg_integer(),
    uncompressed_size :: non_neg_integer(),
    local_header_offset :: non_neg_integer(),
    % TODO: we should treat binary as "IBM Code Page 437" encoded string if GP flag 11 is not set
    file_name :: binary(),
    is_regular_file :: boolean()
}).