These constants describe the download state of a message.  
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#define  | DC_DOWNLOAD_AVAILABLE   10 | 
|   | Download available, see dc_msg_get_download_state() for details. 
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#define  | DC_DOWNLOAD_DONE   0 | 
|   | Download not needed, see dc_msg_get_download_state() for details. 
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#define  | DC_DOWNLOAD_FAILURE   20 | 
|   | Download failed, see dc_msg_get_download_state() for details. 
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#define  | DC_DOWNLOAD_IN_PROGRESS   1000 | 
|   | Download in progress, see dc_msg_get_download_state() for details. 
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#define  | DC_DOWNLOAD_UNDECIPHERABLE   30 | 
|   | Download not needed, see dc_msg_get_download_state() for details. 
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These constants describe the download state of a message. 
The download state can be retrieved using dc_msg_get_download_state() and usually changes after calling dc_download_full_msg().