Thirdparty: Fill copyright for lws, miniupnpc, clipper

Rename `lws` to `libwebsockets` which is its library name.

Add missing license file for mbedtls.

1 files changed, 883 insertions, 0 deletions

diff --git a/thirdparty/libwebsockets/output.c b/thirdparty/libwebsockets/output.c
new file mode 100644
index 0000000000..375ff3ef99
--- /dev/null
+++ b/thirdparty/libwebsockets/output.c
@@ -0,0 +1,883 @@
+/*
+ * libwebsockets - small server side websockets and web server implementation
+ *
+ * Copyright (C) 2010-2017 Andy Green <andy@warmcat.com>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation:
+ *  version 2.1 of the License.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ *  MA  02110-1301  USA
+ */
+
+#include "private-libwebsockets.h"
+
+static int
+lws_0405_frame_mask_generate(struct lws *wsi)
+{
+#if 0
+	wsi->u.ws.mask[0] = 0;
+	wsi->u.ws.mask[1] = 0;
+	wsi->u.ws.mask[2] = 0;
+	wsi->u.ws.mask[3] = 0;
+#else
+	int n;
+	/* fetch the per-frame nonce */
+
+	n = lws_get_random(lws_get_context(wsi), wsi->u.ws.mask, 4);
+	if (n != 4) {
+		lwsl_parser("Unable to read from random device %s %d\n",
+			    SYSTEM_RANDOM_FILEPATH, n);
+		return 1;
+	}
+#endif
+	/* start masking from first byte of masking key buffer */
+	wsi->u.ws.mask_idx = 0;
+
+	return 0;
+}
+
+/*
+ * notice this returns number of bytes consumed, or -1
+ */
+int lws_issue_raw(struct lws *wsi, unsigned char *buf, size_t len)
+{
+	struct lws_context *context = lws_get_context(wsi);
+	struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
+	size_t real_len = len;
+	unsigned int n;
+	int m;
+
+	lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_API_WRITE, 1);
+
+	if (!len)
+		return 0;
+	/* just ignore sends after we cleared the truncation buffer */
+	if (wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE &&
+	    !wsi->trunc_len)
+		return len;
+
+	if (wsi->trunc_len && (buf < wsi->trunc_alloc ||
+	    buf > (wsi->trunc_alloc + wsi->trunc_len + wsi->trunc_offset))) {
+		char dump[20];
+		strncpy(dump, (char *)buf, sizeof(dump) - 1);
+		dump[sizeof(dump) - 1] = '\0';
+#if defined(LWS_WITH_ESP8266)
+		lwsl_err("****** %p: Sending new %lu (%s), pending truncated ...\n",
+			 wsi, (unsigned long)len, dump);
+#else
+		lwsl_err("****** %p: Sending new %lu (%s), pending truncated ...\n"
+			 "       It's illegal to do an lws_write outside of\n"
+			 "       the writable callback: fix your code\n",
+			 wsi, (unsigned long)len, dump);
+#endif
+		assert(0);
+
+		return -1;
+	}
+
+	m = lws_ext_cb_active(wsi, LWS_EXT_CB_PACKET_TX_DO_SEND, &buf, len);
+	if (m < 0)
+		return -1;
+	if (m) /* handled */ {
+		n = m;
+		goto handle_truncated_send;
+	}
+
+	if (!wsi->http2_substream && !lws_socket_is_valid(wsi->desc.sockfd))
+		lwsl_warn("** error invalid sock but expected to send\n");
+
+	/* limit sending */
+	if (wsi->protocol->tx_packet_size)
+		n = wsi->protocol->tx_packet_size;
+	else {
+		n = wsi->protocol->rx_buffer_size;
+		if (!n)
+			n = context->pt_serv_buf_size;
+	}
+	n += LWS_PRE + 4;
+	if (n > len)
+		n = len;
+#if defined(LWS_WITH_ESP8266)	
+	if (wsi->pending_send_completion) {
+		n = 0;
+		goto handle_truncated_send;
+	}
+#endif
+
+	/* nope, send it on the socket directly */
+	lws_latency_pre(context, wsi);
+	n = lws_ssl_capable_write(wsi, buf, n);
+	lws_latency(context, wsi, "send lws_issue_raw", n, n == len);
+
+	switch (n) {
+	case LWS_SSL_CAPABLE_ERROR:
+		/* we're going to close, let close know sends aren't possible */
+		wsi->socket_is_permanently_unusable = 1;
+		return -1;
+	case LWS_SSL_CAPABLE_MORE_SERVICE:
+		/* nothing got sent, not fatal, retry the whole thing later */
+		n = 0;
+		break;
+	}
+
+handle_truncated_send:
+	/*
+	 * we were already handling a truncated send?
+	 */
+	if (wsi->trunc_len) {
+		lwsl_info("%p partial adv %d (vs %ld)\n", wsi, n, (long)real_len);
+		wsi->trunc_offset += n;
+		wsi->trunc_len -= n;
+
+		if (!wsi->trunc_len) {
+			lwsl_info("***** %p partial send completed\n", wsi);
+			/* done with it, but don't free it */
+			n = real_len;
+			if (wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
+				lwsl_info("***** %p signalling to close now\n", wsi);
+				return -1; /* retry closing now */
+			}
+		}
+		/* always callback on writeable */
+		lws_callback_on_writable(wsi);
+
+		return n;
+	}
+
+	if ((unsigned int)n == real_len)
+		/* what we just sent went out cleanly */
+		return n;
+
+	/*
+	 * Newly truncated send.  Buffer the remainder (it will get
+	 * first priority next time the socket is writable)
+	 */
+	lwsl_debug("%p new partial sent %d from %lu total\n", wsi, n,
+		    (unsigned long)real_len);
+
+	lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_WRITE_PARTIALS, 1);
+	lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_B_PARTIALS_ACCEPTED_PARTS, n);
+
+	/*
+	 *  - if we still have a suitable malloc lying around, use it
+	 *  - or, if too small, reallocate it
+	 *  - or, if no buffer, create it
+	 */
+	if (!wsi->trunc_alloc || real_len - n > wsi->trunc_alloc_len) {
+		lws_free(wsi->trunc_alloc);
+
+		wsi->trunc_alloc_len = real_len - n;
+		wsi->trunc_alloc = lws_malloc(real_len - n, "truncated send alloc");
+		if (!wsi->trunc_alloc) {
+			lwsl_err("truncated send: unable to malloc %lu\n",
+				 (unsigned long)(real_len - n));
+			return -1;
+		}
+	}
+	wsi->trunc_offset = 0;
+	wsi->trunc_len = real_len - n;
+	memcpy(wsi->trunc_alloc, buf + n, real_len - n);
+
+	/* since something buffered, force it to get another chance to send */
+	lws_callback_on_writable(wsi);
+
+	return real_len;
+}
+
+LWS_VISIBLE int lws_write(struct lws *wsi, unsigned char *buf, size_t len,
+			  enum lws_write_protocol wp)
+{
+	struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
+	int masked7 = (wsi->mode == LWSCM_WS_CLIENT);
+	unsigned char is_masked_bit = 0;
+	unsigned char *dropmask = NULL;
+	struct lws_tokens eff_buf;
+	size_t orig_len = len;
+	int pre = 0, n;
+
+	if (wsi->parent_carries_io) {
+		struct lws_write_passthru pas;
+
+		pas.buf = buf;
+		pas.len = len;
+		pas.wp = wp;
+		pas.wsi = wsi;
+
+		if (wsi->parent->protocol->callback(wsi->parent,
+				LWS_CALLBACK_CHILD_WRITE_VIA_PARENT,
+				wsi->parent->user_space,
+				(void *)&pas, 0))
+			return 1;
+
+		return len;
+	}
+
+	lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_C_API_LWS_WRITE, 1);
+
+	if ((int)len < 0) {
+		lwsl_err("%s: suspicious len int %d, ulong %lu\n", __func__,
+				(int)len, (unsigned long)len);
+		return -1;
+	}
+
+	lws_stats_atomic_bump(wsi->context, pt, LWSSTATS_B_WRITE, len);
+
+#ifdef LWS_WITH_ACCESS_LOG
+	wsi->access_log.sent += len;
+#endif
+	if (wsi->vhost)
+		wsi->vhost->conn_stats.tx += len;
+
+	if (wsi->state == LWSS_ESTABLISHED && wsi->u.ws.tx_draining_ext) {
+		/* remove us from the list */
+		struct lws **w = &pt->tx_draining_ext_list;
+
+		wsi->u.ws.tx_draining_ext = 0;
+		/* remove us from context draining ext list */
+		while (*w) {
+			if (*w == wsi) {
+				*w = wsi->u.ws.tx_draining_ext_list;
+				break;
+			}
+			w = &((*w)->u.ws.tx_draining_ext_list);
+		}
+		wsi->u.ws.tx_draining_ext_list = NULL;
+		wp = (wsi->u.ws.tx_draining_stashed_wp & 0xc0) |
+				LWS_WRITE_CONTINUATION;
+
+		lwsl_ext("FORCED draining wp to 0x%02X\n", wp);
+	}
+
+	lws_restart_ws_ping_pong_timer(wsi);
+
+	if ((wp & 0x1f) == LWS_WRITE_HTTP ||
+	    (wp & 0x1f) == LWS_WRITE_HTTP_FINAL ||
+	    (wp & 0x1f) == LWS_WRITE_HTTP_HEADERS_CONTINUATION ||
+	    (wp & 0x1f) == LWS_WRITE_HTTP_HEADERS)
+		goto send_raw;
+
+	/* if not in a state to send stuff, then just send nothing */
+
+	if (wsi->state != LWSS_ESTABLISHED &&
+	    ((wsi->state != LWSS_RETURNED_CLOSE_ALREADY &&
+	      wsi->state != LWSS_WAITING_TO_SEND_CLOSE_NOTIFICATION &&
+	      wsi->state != LWSS_AWAITING_CLOSE_ACK) ||
+			    wp != LWS_WRITE_CLOSE)) {
+		lwsl_debug("binning\n");
+		return 0;
+	}
+
+	/* if we are continuing a frame that already had its header done */
+
+	if (wsi->u.ws.inside_frame) {
+		lwsl_debug("INSIDE FRAME\n");
+		goto do_more_inside_frame;
+	}
+
+	wsi->u.ws.clean_buffer = 1;
+
+	/*
+	 * give a chance to the extensions to modify payload
+	 * the extension may decide to produce unlimited payload erratically
+	 * (eg, compression extension), so we require only that if he produces
+	 * something, it will be a complete fragment of the length known at
+	 * the time (just the fragment length known), and if he has
+	 * more we will come back next time he is writeable and allow him to
+	 * produce more fragments until he's drained.
+	 *
+	 * This allows what is sent each time it is writeable to be limited to
+	 * a size that can be sent without partial sends or blocking, allows
+	 * interleaving of control frames and other connection service.
+	 */
+	eff_buf.token = (char *)buf;
+	eff_buf.token_len = len;
+
+	switch ((int)wp) {
+	case LWS_WRITE_PING:
+	case LWS_WRITE_PONG:
+	case LWS_WRITE_CLOSE:
+		break;
+	default:
+		lwsl_debug("LWS_EXT_CB_PAYLOAD_TX\n");
+		n = lws_ext_cb_active(wsi, LWS_EXT_CB_PAYLOAD_TX, &eff_buf, wp);
+		if (n < 0)
+			return -1;
+
+		if (n && eff_buf.token_len) {
+			lwsl_debug("drain len %d\n", (int)eff_buf.token_len);
+			/* extension requires further draining */
+			wsi->u.ws.tx_draining_ext = 1;
+			wsi->u.ws.tx_draining_ext_list = pt->tx_draining_ext_list;
+			pt->tx_draining_ext_list = wsi;
+			/* we must come back to do more */
+			lws_callback_on_writable(wsi);
+			/*
+			 * keep a copy of the write type for the overall
+			 * action that has provoked generation of these
+			 * fragments, so the last guy can use its FIN state.
+			 */
+			wsi->u.ws.tx_draining_stashed_wp = wp;
+			/* this is definitely not actually the last fragment
+			 * because the extension asserted he has more coming
+			 * So make sure this intermediate one doesn't go out
+			 * with a FIN.
+			 */
+			wp |= LWS_WRITE_NO_FIN;
+		}
+
+		if (eff_buf.token_len && wsi->u.ws.stashed_write_pending) {
+			wsi->u.ws.stashed_write_pending = 0;
+			wp = (wp &0xc0) | (int)wsi->u.ws.stashed_write_type;
+		}
+	}
+
+	/*
+	 * an extension did something we need to keep... for example, if
+	 * compression extension, it has already updated its state according
+	 * to this being issued
+	 */
+	if ((char *)buf != eff_buf.token) {
+		/*
+		 * ext might eat it, but not have anything to issue yet.
+		 * In that case we have to follow his lead, but stash and
+		 * replace the write type that was lost here the first time.
+		 */
+		if (len && !eff_buf.token_len) {
+			if (!wsi->u.ws.stashed_write_pending)
+				wsi->u.ws.stashed_write_type = (char)wp & 0x3f;
+			wsi->u.ws.stashed_write_pending = 1;
+			return len;
+		}
+		/*
+		 * extension recreated it:
+		 * need to buffer this if not all sent
+		 */
+		wsi->u.ws.clean_buffer = 0;
+	}
+
+	buf = (unsigned char *)eff_buf.token;
+	len = eff_buf.token_len;
+
+	if (!buf) {
+		lwsl_err("null buf (%d)\n", (int)len);
+		return -1;
+	}
+
+	switch (wsi->ietf_spec_revision) {
+	case 13:
+		if (masked7) {
+			pre += 4;
+			dropmask = &buf[0 - pre];
+			is_masked_bit = 0x80;
+		}
+
+		switch (wp & 0xf) {
+		case LWS_WRITE_TEXT:
+			n = LWSWSOPC_TEXT_FRAME;
+			break;
+		case LWS_WRITE_BINARY:
+			n = LWSWSOPC_BINARY_FRAME;
+			break;
+		case LWS_WRITE_CONTINUATION:
+			n = LWSWSOPC_CONTINUATION;
+			break;
+
+		case LWS_WRITE_CLOSE:
+			n = LWSWSOPC_CLOSE;
+			break;
+		case LWS_WRITE_PING:
+			n = LWSWSOPC_PING;
+			break;
+		case LWS_WRITE_PONG:
+			n = LWSWSOPC_PONG;
+			break;
+		default:
+			lwsl_warn("lws_write: unknown write opc / wp\n");
+			return -1;
+		}
+
+		if (!(wp & LWS_WRITE_NO_FIN))
+			n |= 1 << 7;
+
+		if (len < 126) {
+			pre += 2;
+			buf[-pre] = n;
+			buf[-pre + 1] = (unsigned char)(len | is_masked_bit);
+		} else {
+			if (len < 65536) {
+				pre += 4;
+				buf[-pre] = n;
+				buf[-pre + 1] = 126 | is_masked_bit;
+				buf[-pre + 2] = (unsigned char)(len >> 8);
+				buf[-pre + 3] = (unsigned char)len;
+			} else {
+				pre += 10;
+				buf[-pre] = n;
+				buf[-pre + 1] = 127 | is_masked_bit;
+#if defined __LP64__
+					buf[-pre + 2] = (len >> 56) & 0x7f;
+					buf[-pre + 3] = len >> 48;
+					buf[-pre + 4] = len >> 40;
+					buf[-pre + 5] = len >> 32;
+#else
+					buf[-pre + 2] = 0;
+					buf[-pre + 3] = 0;
+					buf[-pre + 4] = 0;
+					buf[-pre + 5] = 0;
+#endif
+				buf[-pre + 6] = (unsigned char)(len >> 24);
+				buf[-pre + 7] = (unsigned char)(len >> 16);
+				buf[-pre + 8] = (unsigned char)(len >> 8);
+				buf[-pre + 9] = (unsigned char)len;
+			}
+		}
+		break;
+	}
+
+do_more_inside_frame:
+
+	/*
+	 * Deal with masking if we are in client -> server direction and
+	 * the wp demands it
+	 */
+
+	if (masked7) {
+		if (!wsi->u.ws.inside_frame)
+			if (lws_0405_frame_mask_generate(wsi)) {
+				lwsl_err("frame mask generation failed\n");
+				return -1;
+			}
+
+		/*
+		 * in v7, just mask the payload
+		 */
+		if (dropmask) { /* never set if already inside frame */
+			for (n = 4; n < (int)len + 4; n++)
+				dropmask[n] = dropmask[n] ^ wsi->u.ws.mask[
+					(wsi->u.ws.mask_idx++) & 3];
+
+			/* copy the frame nonce into place */
+			memcpy(dropmask, wsi->u.ws.mask, 4);
+		}
+	}
+
+send_raw:
+	switch ((int)(wp & 0x1f)) {
+	case LWS_WRITE_CLOSE:
+/*		lwsl_hexdump(&buf[-pre], len); */
+	case LWS_WRITE_HTTP:
+	case LWS_WRITE_HTTP_FINAL:
+	case LWS_WRITE_HTTP_HEADERS:
+	case LWS_WRITE_HTTP_HEADERS_CONTINUATION:
+	case LWS_WRITE_PONG:
+	case LWS_WRITE_PING:
+#ifdef LWS_WITH_HTTP2
+		if (wsi->mode == LWSCM_HTTP2_SERVING) {
+			unsigned char flags = 0;
+
+			n = LWS_H2_FRAME_TYPE_DATA;
+			if ((wp & 0x1f) == LWS_WRITE_HTTP_HEADERS) {
+				n = LWS_H2_FRAME_TYPE_HEADERS;
+				if (!(wp & LWS_WRITE_NO_FIN))
+					flags = LWS_H2_FLAG_END_HEADERS;
+				if (wsi->u.h2.send_END_STREAM || (wp & LWS_WRITE_H2_STREAM_END)) {
+					flags |= LWS_H2_FLAG_END_STREAM;
+					wsi->u.h2.send_END_STREAM = 1;
+				}
+			}
+
+			if ((wp & 0x1f) == LWS_WRITE_HTTP_HEADERS_CONTINUATION) {
+				n = LWS_H2_FRAME_TYPE_CONTINUATION;
+				if (!(wp & LWS_WRITE_NO_FIN))
+					flags = LWS_H2_FLAG_END_HEADERS;
+				if (wsi->u.h2.send_END_STREAM || (wp & LWS_WRITE_H2_STREAM_END)) {
+					flags |= LWS_H2_FLAG_END_STREAM;
+					wsi->u.h2.send_END_STREAM = 1;
+				}
+			}
+
+			if (((wp & 0x1f) == LWS_WRITE_HTTP ||
+			     (wp & 0x1f) == LWS_WRITE_HTTP_FINAL) &&
+			    wsi->u.http.tx_content_length) {
+				wsi->u.http.tx_content_remain -= len;
+				lwsl_info("%s: wsi %p: tx_content_remain = %llu\n", __func__, wsi,
+					  (unsigned long long)wsi->u.http.tx_content_remain);
+				if (!wsi->u.http.tx_content_remain) {
+					lwsl_info("%s: selecting final write mode\n", __func__);
+					wp = LWS_WRITE_HTTP_FINAL;
+				}
+			}
+
+			if ((wp & 0x1f) == LWS_WRITE_HTTP_FINAL || (wp & LWS_WRITE_H2_STREAM_END)) {
+			    //lws_get_network_wsi(wsi)->u.h2.END_STREAM) {
+				lwsl_info("%s: setting END_STREAM\n", __func__);
+				flags |= LWS_H2_FLAG_END_STREAM;
+				wsi->u.h2.send_END_STREAM = 1;
+			}
+
+			return lws_h2_frame_write(wsi, n, flags,
+					wsi->u.h2.my_sid, len, buf);
+		}
+#endif
+		return lws_issue_raw(wsi, (unsigned char *)buf - pre, len + pre);
+	default:
+		break;
+	}
+
+	/*
+	 * give any active extensions a chance to munge the buffer
+	 * before send.  We pass in a pointer to an lws_tokens struct
+	 * prepared with the default buffer and content length that's in
+	 * there.  Rather than rewrite the default buffer, extensions
+	 * that expect to grow the buffer can adapt .token to
+	 * point to their own per-connection buffer in the extension
+	 * user allocation.  By default with no extensions or no
+	 * extension callback handling, just the normal input buffer is
+	 * used then so it is efficient.
+	 *
+	 * callback returns 1 in case it wants to spill more buffers
+	 *
+	 * This takes care of holding the buffer if send is incomplete, ie,
+	 * if wsi->u.ws.clean_buffer is 0 (meaning an extension meddled with
+	 * the buffer).  If wsi->u.ws.clean_buffer is 1, it will instead
+	 * return to the user code how much OF THE USER BUFFER was consumed.
+	 */
+
+	n = lws_issue_raw_ext_access(wsi, buf - pre, len + pre);
+	wsi->u.ws.inside_frame = 1;
+	if (n <= 0)
+		return n;
+
+	if (n == (int)len + pre) {
+		/* everything in the buffer was handled (or rebuffered...) */
+		wsi->u.ws.inside_frame = 0;
+		return orig_len;
+	}
+
+	/*
+	 * it is how many bytes of user buffer got sent... may be < orig_len
+	 * in which case callback when writable has already been arranged
+	 * and user code can call lws_write() again with the rest
+	 * later.
+	 */
+
+	return n - pre;
+}
+
+LWS_VISIBLE int lws_serve_http_file_fragment(struct lws *wsi)
+{
+	struct lws_context *context = wsi->context;
+	struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
+	struct lws_process_html_args args;
+	lws_filepos_t amount, poss;
+	unsigned char *p, *pstart;
+#if defined(LWS_WITH_RANGES)
+	unsigned char finished = 0;
+#endif
+	int n, m;
+
+	lwsl_debug("wsi->http2_substream %d\n", wsi->http2_substream);
+
+	while (!lws_send_pipe_choked(wsi)) {
+
+		if (wsi->trunc_len) {
+			if (lws_issue_raw(wsi, wsi->trunc_alloc +
+					  wsi->trunc_offset,
+					  wsi->trunc_len) < 0) {
+				lwsl_info("%s: closing\n", __func__);
+				goto file_had_it;
+			}
+			continue;
+		}
+
+		if (wsi->u.http.filepos == wsi->u.http.filelen)
+			goto all_sent;
+
+		n = 0;
+
+		pstart = pt->serv_buf + LWS_H2_FRAME_HEADER_LENGTH;
+
+		p = pstart;
+
+#if defined(LWS_WITH_RANGES)
+		if (wsi->u.http.range.count_ranges && !wsi->u.http.range.inside) {
+
+			lwsl_notice("%s: doing range start %llu\n", __func__, wsi->u.http.range.start);
+
+			if ((long long)lws_vfs_file_seek_cur(wsi->u.http.fop_fd,
+						   wsi->u.http.range.start -
+						   wsi->u.http.filepos) < 0)
+				goto file_had_it;
+
+			wsi->u.http.filepos = wsi->u.http.range.start;
+
+			if (wsi->u.http.range.count_ranges > 1) {
+				n =  lws_snprintf((char *)p, context->pt_serv_buf_size - LWS_H2_FRAME_HEADER_LENGTH,
+					"_lws\x0d\x0a"
+					"Content-Type: %s\x0d\x0a"
+					"Content-Range: bytes %llu-%llu/%llu\x0d\x0a"
+					"\x0d\x0a",
+					wsi->u.http.multipart_content_type,
+					wsi->u.http.range.start,
+					wsi->u.http.range.end,
+					wsi->u.http.range.extent);
+				p += n;
+			}
+
+			wsi->u.http.range.budget = wsi->u.http.range.end -
+						   wsi->u.http.range.start + 1;
+			wsi->u.http.range.inside = 1;
+		}
+#endif
+
+		poss = context->pt_serv_buf_size - n - LWS_H2_FRAME_HEADER_LENGTH;
+
+		if (poss > wsi->u.http.tx_content_remain)
+			poss = wsi->u.http.tx_content_remain;
+
+		/*
+		 * if there is a hint about how much we will do well to send at one time,
+		 * restrict ourselves to only trying to send that.
+		 */
+		if (wsi->protocol->tx_packet_size &&
+		    poss > wsi->protocol->tx_packet_size)
+			poss = wsi->protocol->tx_packet_size;
+
+#if defined(LWS_WITH_HTTP2)
+		m = lws_h2_tx_cr_get(wsi);
+		if (!m) {
+			lwsl_info("%s: came here with no tx credit", __func__);
+			return 0;
+		}
+		if (m < poss)
+			poss = m;
+		/*
+		 * consumption of the actual payload amount sent will be handled
+		 * when the http2 data frame is sent
+		 */
+#endif
+
+#if defined(LWS_WITH_RANGES)
+		if (wsi->u.http.range.count_ranges) {
+			if (wsi->u.http.range.count_ranges > 1)
+				poss -= 7; /* allow for final boundary */
+			if (poss > wsi->u.http.range.budget)
+				poss = wsi->u.http.range.budget;
+		}
+#endif
+		if (wsi->sending_chunked) {
+			/* we need to drop the chunk size in here */
+			p += 10;
+			/* allow for the chunk to grow by 128 in translation */
+			poss -= 10 + 128;
+		}
+
+		if (lws_vfs_file_read(wsi->u.http.fop_fd, &amount, p, poss) < 0)
+			goto file_had_it; /* caller will close */
+
+		if (wsi->sending_chunked)
+			n = (int)amount;
+		else
+			n = (p - pstart) + (int)amount;
+
+		lwsl_debug("%s: sending %d\n", __func__, n);
+
+		if (n) {
+			lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
+					context->timeout_secs);
+
+			if (wsi->sending_chunked) {
+				args.p = (char *)p;
+				args.len = n;
+				args.max_len = (unsigned int)poss + 128;
+				args.final = wsi->u.http.filepos + n ==
+					     wsi->u.http.filelen;
+				if (user_callback_handle_rxflow(
+				     wsi->vhost->protocols[(int)wsi->protocol_interpret_idx].callback, wsi,
+				     LWS_CALLBACK_PROCESS_HTML,
+				     wsi->user_space, &args, 0) < 0)
+					goto file_had_it;
+				n = args.len;
+				p = (unsigned char *)args.p;
+			} else
+				p = pstart;
+
+#if defined(LWS_WITH_RANGES)
+			if (wsi->u.http.range.send_ctr + 1 ==
+				wsi->u.http.range.count_ranges && // last range
+			    wsi->u.http.range.count_ranges > 1 && // was 2+ ranges (ie, multipart)
+			    wsi->u.http.range.budget - amount == 0) {// final part
+				n += lws_snprintf((char *)pstart + n, 6,
+					"_lws\x0d\x0a"); // append trailing boundary
+				lwsl_debug("added trailing boundary\n");
+			}
+#endif
+			m = lws_write(wsi, p, n,
+				      wsi->u.http.filepos == wsi->u.http.filelen ?
+					LWS_WRITE_HTTP_FINAL :
+					LWS_WRITE_HTTP
+				);
+			if (m < 0)
+				goto file_had_it;
+
+			wsi->u.http.filepos += amount;
+
+#if defined(LWS_WITH_RANGES)
+			if (wsi->u.http.range.count_ranges >= 1) {
+				wsi->u.http.range.budget -= amount;
+				if (wsi->u.http.range.budget == 0) {
+					lwsl_notice("range budget exhausted\n");
+					wsi->u.http.range.inside = 0;
+					wsi->u.http.range.send_ctr++;
+
+					if (lws_ranges_next(&wsi->u.http.range) < 1) {
+						finished = 1;
+						goto all_sent;
+					}
+				}
+			}
+#endif
+
+			if (m != n) {
+				/* adjust for what was not sent */
+				if (lws_vfs_file_seek_cur(wsi->u.http.fop_fd,
+							   m - n) ==
+							     (unsigned long)-1)
+					goto file_had_it;
+			}
+		}
+
+all_sent:
+		if ((!wsi->trunc_len && wsi->u.http.filepos >= wsi->u.http.filelen)
+#if defined(LWS_WITH_RANGES)
+		    || finished)
+#else
+		)
+#endif
+		     {
+			wsi->state = LWSS_HTTP;
+			/* we might be in keepalive, so close it off here */
+			lws_vfs_file_close(&wsi->u.http.fop_fd);
+			
+			lwsl_debug("file completed\n");
+
+			if (wsi->protocol->callback &&
+			    user_callback_handle_rxflow(wsi->protocol->callback,
+					    	    	wsi, LWS_CALLBACK_HTTP_FILE_COMPLETION,
+					    	    	wsi->user_space, NULL,
+					    	    	0) < 0) {
+					/*
+					 * For http/1.x, the choices from
+					 * transaction_completed are either
+					 * 0 to use the connection for pipelined
+					 * or nonzero to hang it up.
+					 *
+					 * However for http/2. while we are
+					 * still interested in hanging up the
+					 * nwsi if there was a network-level
+					 * fatal error, simply completing the
+					 * transaction is a matter of the stream
+					 * state, not the root connection at the
+					 * network level
+					 */
+					if (wsi->http2_substream)
+						return 1;
+					else
+						return -1;
+				}
+
+			return 1;  /* >0 indicates completed */
+		}
+	}
+
+	lws_callback_on_writable(wsi);
+
+	return 0; /* indicates further processing must be done */
+
+file_had_it:
+	lws_vfs_file_close(&wsi->u.http.fop_fd);
+
+	return -1;
+}
+
+#if LWS_POSIX
+LWS_VISIBLE int
+lws_ssl_capable_read_no_ssl(struct lws *wsi, unsigned char *buf, int len)
+{
+	struct lws_context *context = wsi->context;
+	struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
+	int n;
+
+	lws_stats_atomic_bump(context, pt, LWSSTATS_C_API_READ, 1);
+
+	n = recv(wsi->desc.sockfd, (char *)buf, len, 0);
+	if (n >= 0) {
+		if (wsi->vhost)
+			wsi->vhost->conn_stats.rx += n;
+		lws_stats_atomic_bump(context, pt, LWSSTATS_B_READ, n);
+		lws_restart_ws_ping_pong_timer(wsi);
+		return n;
+	}
+#if LWS_POSIX
+	if (LWS_ERRNO == LWS_EAGAIN ||
+	    LWS_ERRNO == LWS_EWOULDBLOCK ||
+	    LWS_ERRNO == LWS_EINTR)
+		return LWS_SSL_CAPABLE_MORE_SERVICE;
+#endif
+	lwsl_notice("error on reading from skt : %d\n", LWS_ERRNO);
+	return LWS_SSL_CAPABLE_ERROR;
+}
+
+LWS_VISIBLE int
+lws_ssl_capable_write_no_ssl(struct lws *wsi, unsigned char *buf, int len)
+{
+	int n = 0;
+
+#if LWS_POSIX
+	n = send(wsi->desc.sockfd, (char *)buf, len, MSG_NOSIGNAL);
+//	lwsl_info("%s: sent len %d result %d", __func__, len, n);
+	if (n >= 0)
+		return n;
+
+	if (LWS_ERRNO == LWS_EAGAIN ||
+	    LWS_ERRNO == LWS_EWOULDBLOCK ||
+	    LWS_ERRNO == LWS_EINTR) {
+		if (LWS_ERRNO == LWS_EWOULDBLOCK) {
+			lws_set_blocking_send(wsi);
+		}
+
+		return LWS_SSL_CAPABLE_MORE_SERVICE;
+	}
+#else
+	(void)n;
+	(void)wsi;
+	(void)buf;
+	(void)len;
+	// !!!
+#endif
+
+	lwsl_debug("ERROR writing len %d to skt fd %d err %d / errno %d\n",
+			len, wsi->desc.sockfd, n, LWS_ERRNO);
+	return LWS_SSL_CAPABLE_ERROR;
+}
+#endif
+LWS_VISIBLE int
+lws_ssl_pending_no_ssl(struct lws *wsi)
+{
+	(void)wsi;
+#if defined(LWS_WITH_ESP32)
+	return 100;
+#else
+	return 0;
+#endif
+}