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char *hal_get_useful_str(hal_prop_t *prop, const char *key);
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hal_device_t *hal_find_device(hd_data_t *hd_data, char *udi);
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char *hd_get_hddb_dir(void);
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char *hd_get_hddb_path(char *sub);
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int hd_mod_cmp(char *str1, char *str2);