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e3f335148a
curl_ws_recv() now receives data to fill up the provided buffer, but can return a partial fragment. The function now also get a pointer to a curl_ws_frame struct with metadata that also mentions the offset and total size of the fragment (of which you might be receiving a smaller piece). This way, large incoming fragments will be "streamed" to the application. When the curl_ws_frame struct field 'bytesleft' is 0, the final fragment piece has been delivered. curl_ws_recv() was also adjusted to work with a buffer size smaller than the fragment size. (Possibly needless to say as the fragment size can now be 63 bit large). curl_ws_send() now supports sending a piece of a fragment, in a streaming manner, in addition to sending the entire fragment in a single call if it is small enough. To send a huge fragment, curl_ws_send() can be used to send it in many small calls by first telling libcurl about the total expected fragment size, and then send the payload in N number of separate invokes and libcurl will stream those over the wire. The struct curl_ws_meta() returns is now called 'curl_ws_frame' and it has been extended with two new fields: *offset* and *bytesleft*. To help describe the passed on data chunk when a fragment is delivered in many smaller pieces. The documentation has been updated accordingly. Closes #9636
61 lines
2.2 KiB
Groff
61 lines
2.2 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH curl_ws_recv 3 "12 Jun 2022" "libcurl 7.85.0" "libcurl Manual"
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.SH NAME
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curl_ws_recv - receive WebSocket data
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.SH SYNOPSIS
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.nf
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#include <curl/easy.h>
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CURLcode curl_ws_recv(CURL *curl, void *buffer, size_t buflen,
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size_t *recv, struct curl_ws_frame **meta);
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.fi
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.SH DESCRIPTION
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This function call is EXPERIMENTAL.
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Retrieves as much as possible of a received WebSocket data fragment into the
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\fBbuffer\fP, but not more than \fBbuflen\fP bytes. \fIrecv\fP is set to the
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number of bytes actually stored.
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If there is more fragment data to deliver than what fits in the provided
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\fIbuffer\fP, libcurl returns a full buffer and the application needs to call
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this function again to continue draining the buffer.
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The \fImeta\fP pointer gets set to point to a \fIstruct curl_ws_frame\fP that
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contains information about the received data. See the \fIcurl_ws_meta(3)\fP
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for details on that struct.
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.SH EXAMPLE
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.nf
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.fi
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.SH AVAILABILITY
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Added in 7.86.0.
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.SH RETURN VALUE
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.SH "SEE ALSO"
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.BR curl_easy_setopt "(3), " curl_easy_perform "(3), "
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.BR curl_easy_getinfo "(3), "
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.BR curl_ws_send "(3) "
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