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Minor tidy up of code layout and comments following recent changes.
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Introduced the result code variable to simplify the state changes and
remove the hard returns.
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For consistency changed the logic of the imap_state_append_resp()
function to test for an unsucessful continuation response rather than a
succesful one.
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For consistency changed two if(constant != imapcode) tests to be
if(imapcode != constant).
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Added logic in imap_perform() to perform an APPEND rather than SELECT
and FETCH if an upload has been specified.
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The APPEND operation needs to be performed in several steps:
1) We send "<tag> APPEND <mailbox> <flags> {<size>}\r\n"
2) Server responds with continuation respose "+ ...\r\n"
3) We start the transfer and send <size> bytes of data
4) Only now we end the request command line by sending "\r\n"
5) Server responds with "<tag> OK ...\r\n"
This commit performs steps 4 and 5, in the DONE phase, as more
processing is required after the transfer.
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Added imap_append() function to initiate upload and imap_append_resp()
to handle the continuation response and start the transfer.
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Add number of bytes retrieved from the PP cache to req.bytecount and set
req.maxdownload only when starting a proper download.
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Added safer parsing of the untagged FETCH response line and the size of
continuation data.
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Accidentally lost the result code in imap_state_capability() and
imap_state_login() with commit b06a78622609.
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Some state changes would be performed after a failure test that
performed a hard return, whilst others would be performed within a test
for success. Updated the code, for consistency, so all instances are
performed within a success test.
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Removed superfluous NULL assignment after Curl_safefree() and rewrote
some comments and logging messages.
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Following commit 13006f3de9ec corrected the debug message in state()
from AUTHENTICATE to AUTHENTICATE_FINAL.
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If the FETCH command does not result in an untagged response the the
UID is probably invalid. As such do not return CURLE_OK.
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Not processing the final FETCH responses was not optimal, not only
because the response code would be ignored but it would also leave data
unread on the socket which would prohibit connection reuse.
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A typical FETCH response can be broken down into four parts:
1) "* <uid> FETCH (<what> {<size>}\r\n", using continuation syntax
2) <size> bytes of the actual message
3) ")\r\n", finishing the untagged response
4) "<tag> OK ...", finishing the command
Part 1 is read in imap_fetch_resp(), part 2 is consumed in the PERFORM
phase by the transfer subsystem, parts 3 and 4 are currently ignored.
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Removed whitespace from imap_perform()
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error: declaration of 'imap' shadows a previous local
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Changed the final IMAP_AUTHENTICATE constant to IMAP_AUTHENTICATE_FINAL
for consistency with the response function.
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Updated the coding style, in this function, to be consistant with other
response functions rather then performing a hard return on failure.
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Reversed the logic of the unsuccessful vs successful tagged SELECT
response in imap_state_select_resp() to be more logical to read.
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Reversed the logic of the unsuccessful vs successful tagged CAPABILITY
response in imap_state_capability_resp() to be more logical to read.
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Corrected char* references made in commit: 709b3506cd9b.
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Added a loop to imap_statemach_act() in which Curl_pp_readresp() is
called until the cache is drained. Without this multiple responses
received in a single packet could result in a hang or delay.
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Added storage and checking of the last mailbox userd to prevent
unnecessary switching.
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Added the mailbox variable to the per-connection structure in
preparation for checking for an already selected mailbox.
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Added support for checking the UIDVALIDITY, and aborting the request, if
it has been specified in the URL and the server response is different.
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Added support for parsing the UIDVALIDITY property from the SELECT
response and storing it in the per-connection structure.
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Added the mailbox_uidvalidity variable to the per-connection structure
in preparation for checking the UIDVALIDITY mailbox attribute.
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Only responses that contain "CAPABILITY" and "FETCH", respectively,
will be sent to their response handler.
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RFC 3501 states that "the client MUST be prepared to accept any response
at all times" yet we assume anything received with "* " at the beginning
is the untagged response we want.
Introduced a helper function that checks whether the input looks like a
response to specified command, so that we may filter the ones we are
interested in according to the current state.
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Introduced similar handling to the FETCH responses, where even the
untagged data responses are handled by the response handler of the
individual state.
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Removed this pointer to a downloaded bytes counter because it was set in
imap_init() to point to the same variable the transfer functions keep
the count in (k->bytecount), effectively making the code in transfer.c
"*k->bytecountp = k->bytecount" a no-op.
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Moved imap_select() and imap_fetch() to be grouped with the other
perform functions.
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Exchanged the position of these states in the switch statements to
match the state enum, execution and function order.
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Tidy up of comments before next round of imap changes.
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Corrected the comparison type in addition to commit 1dac29fa83a9.
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From a maintenance point of view the code reads better to view tagged
responses, then untagged followed by continuation responses.
Additionally, this matches the order of responses in POP3.
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Enhanced the parsing to only allow continuation responses in some
states.
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