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78 lines
2.9 KiB
78 lines
2.9 KiB
3 years ago
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// This file describes various headers of the protocol and how to use them
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package protocol
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type Header string
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// Headers
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//// In the following below examples "|" is PACKETSIZEDELIMETER and "~" is HEADERDELIMETER
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// FILENAME.
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// This header is sent only by sender. The packet with this header
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// must contain a name of the transported file in BODY.
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// ie: |18|FILENAME~image.png
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const HeaderFilename Header = "FILENAME"
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// FILESIZE.
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// This header is sent only by sender. The packet with this header
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// must contain a size of the transported file in its BODY.
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// ie: |15|FILESIZE~512442
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const HeaderFileSize Header = "FILESIZE"
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// CHECKSUM.
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// Just like before, this header must be sent in a packet only by sender,
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// BODY must contain a checksum of the transported file.
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// ie: |74|CHECKSUM~1673f585148148d0c105af0d55646d6cbbf37e33a7366d3b72d8c5caca13434a
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const HeaderChecksum Header = "CHECKSUM"
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// DOYOACCEPT.
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// Sent by sender after all the information about the transfered file has been sent.
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// Receiving a packet with this header means that there will be no more additional information about the
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// file and the sender is waiting for response (acceptance or rejection of the file).
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// ie: |13|DOYOUACCEPT?~
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const HeaderAcceptance Header = "DOYOUACCEPT?"
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// FILEBYTES.
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// Sent only by sender. The packet`s body must contain
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// a portion of transported file`s bytes.
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// ie: |70|FILEBYTES~fj2pgfjek;hjg02yg082qyuhg83hvuahjvlhsaoughuihgp9earhguhergh\n
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const HeaderFileBytes Header = "FILEBYTES"
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// FILEREJECT.
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// Sent only by receiver if the user has decided to not download the file.
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// The BODY may or may not be empty (preferably empty, of course), in any way, it will not be
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// used in any way.
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// ie: |11|FILEREJECT~
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const HeaderReject Header = "FILEREJECT"
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// FILEACCEPT.
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// The opposite of the previous FILEREJECT. Send by receiver when
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// the user has agreed to download the file.
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// ie: |11|FILEACCEPT~
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const HeaderAccept Header = "FILEACCEPT"
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// DONE.
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// Sent by sender. Warns the receiver that the file transfer has been done and
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// there is no more information to give.
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// ie: |5|DONE~
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// Usually after the packet with this header has been sent, the receiver will send
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// another packet back with header BYE!, telling that it`s going to disconnect
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const HeaderDone Header = "DONE"
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// READY.
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// Sent by receiver when it hass read and processed the last
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// FILEBYTES packet. The sender does not allowed to "spam" FILEBYTES
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// packets without the permission of receiver.
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// ie: |7|READY!~
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const HeaderReady Header = "READY"
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// BYE!.
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// Packet with this header can be sent both by receiver and sender.
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// It`s used when the sender or the receiver are going to disconnect
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// and will not be able to communicate.
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// (Usually it`s when the error has happened, OR, in a good situation, after the DONE header
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// has been sent by sender, warning receiver that there is no data to send)
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// The BODY is better to be empty.
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// ie: |5|BYE!~
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const HeaderDisconnecting Header = "BYE!"
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