superfan89十四年前逆向过了，来自该软件的mdx词典部分归功于此。
可惜论坛没了，我没下载到ydDumper工具。没办法，自己来吧。
21世纪大英汉词典&新汉英大词典【11/8/1更新】 - MDict 词库资源区 - MDict Dictionaries - 掌上百科 - PDAWIKI - Powered by Discuz!
struct DictionaryHeader {
uint64_t unknown_u64_1;
uint64_t unknown_u64_2;
uint8_t name_len;
char name[name_len];
uint64_t unknown_u64_3;
uint64_t total_entries;
uint32_t magic; // Magic bytes (raw 00 C8 00 00)
uint32_t info_length;
char info(info_length);
};
struct Level1IndexTable {
uint32_t index_count;
Level1IndexItem items[index_count];
};
struct Level1IndexItem {
char first_key[];
uint8_t delimiter; // Separator (0x09 / Tab)
uint32_t idx_offset; // Offset to the start of Level 2 Index block
uint32_t idx_items_count; // Number of items in that L2 block
uint32_t idx_len; // Length (bytes) of the L2 block
uint32_t content_offset; // Offset to the start of Content Data block
uint32_t content_len; // Length (bytes) of the Content Data block
};
struct Level2IndexTable {
Level2IndexItem items[idx_items_count];
};
struct Level2IndexItem {
char key_text[];
uint8_t terminator; // Separator (0x09 / Tab)
uint32_t offset_in_ContentItem_be; // Relative offset (Big-Endian)
};
struct ContentDataStream {
byte raw_pool[];
};
struct ContentItem {
VarInt data_length_be; // (Big-Endian)
char text[data_length_be & 0x3F];
};
Level2IndexItem, ContentItem：ZLIB_INFLATE( byte[i] XOR ((i * 7) % 0x8897) )
