Revert "Update libwebsockets to 3.1 (plus UWP patch)"

This reverts commit 90210c48627692d281554d6185b5db17a86c852a.

1 files changed, 668 insertions, 0 deletions

diff --git a/thirdparty/libwebsockets/roles/http/server/fops-zip.c b/thirdparty/libwebsockets/roles/http/server/fops-zip.c
new file mode 100644
index 0000000000..4db83ce621
--- /dev/null
+++ b/thirdparty/libwebsockets/roles/http/server/fops-zip.c
@@ -0,0 +1,668 @@
+/*
+ * libwebsockets - small server side websockets and web server implementation
+ *
+ * Original code used in this source file:
+ *
+ * https://github.com/PerBothner/DomTerm.git @912add15f3d0aec
+ *
+ * ./lws-term/io.c
+ * ./lws-term/junzip.c
+ *
+ * Copyright (C) 2017  Per Bothner <per@bothner.com>
+ *
+ * MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * ( copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ *
+ * lws rewrite:
+ *
+ * Copyright (C) 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 "core/private.h"
+
+#include <zlib.h>
+
+/*
+ * This code works with zip format containers which may have files compressed
+ * with gzip deflate (type 8) or store uncompressed (type 0).
+ *
+ * Linux zip produces such zipfiles by default, eg
+ *
+ *  $ zip ../myzip.zip file1 file2 file3
+ */
+
+#define ZIP_COMPRESSION_METHOD_STORE 0
+#define ZIP_COMPRESSION_METHOD_DEFLATE 8
+
+typedef struct {
+	lws_filepos_t		filename_start;
+	uint32_t		crc32;
+	uint32_t		comp_size;
+	uint32_t		uncomp_size;
+	uint32_t		offset;
+	uint32_t		mod_time;
+	uint16_t		filename_len;
+	uint16_t		extra;
+	uint16_t		method;
+	uint16_t		file_com_len;
+} lws_fops_zip_hdr_t;
+
+typedef struct {
+	struct lws_fop_fd	fop_fd; /* MUST BE FIRST logical fop_fd into
+	 	 	 	 	 * file inside zip: fops_zip fops */
+	lws_fop_fd_t		zip_fop_fd; /* logical fop fd on to zip file
+	 	 	 	 	     * itself: using platform fops */
+	lws_fops_zip_hdr_t	hdr;
+	z_stream		inflate;
+	lws_filepos_t		content_start;
+	lws_filepos_t		exp_uncomp_pos;
+	union {
+		uint8_t		trailer8[8];
+		uint32_t	trailer32[2];
+	} u;
+	uint8_t			rbuf[128]; /* decompression chunk size */
+	int			entry_count;
+
+	unsigned int		decompress:1; /* 0 = direct from file */
+	unsigned int		add_gzip_container:1;
+} *lws_fops_zip_t;
+
+struct lws_plat_file_ops fops_zip;
+#define fop_fd_to_priv(FD) ((lws_fops_zip_t)(FD))
+
+static const uint8_t hd[] = { 31, 139, 8, 0, 0, 0, 0, 0, 0, 3 };
+
+enum {
+	ZC_SIGNATURE				= 0,
+	ZC_VERSION_MADE_BY 			= 4,
+	ZC_VERSION_NEEDED_TO_EXTRACT 		= 6,
+	ZC_GENERAL_PURPOSE_BIT_FLAG 		= 8,
+	ZC_COMPRESSION_METHOD 			= 10,
+	ZC_LAST_MOD_FILE_TIME 			= 12,
+	ZC_LAST_MOD_FILE_DATE 			= 14,
+	ZC_CRC32 				= 16,
+	ZC_COMPRESSED_SIZE 			= 20,
+	ZC_UNCOMPRESSED_SIZE 			= 24,
+	ZC_FILE_NAME_LENGTH 			= 28,
+	ZC_EXTRA_FIELD_LENGTH 			= 30,
+
+	ZC_FILE_COMMENT_LENGTH 			= 32,
+	ZC_DISK_NUMBER_START 			= 34,
+	ZC_INTERNAL_FILE_ATTRIBUTES 		= 36,
+	ZC_EXTERNAL_FILE_ATTRIBUTES 		= 38,
+	ZC_REL_OFFSET_LOCAL_HEADER 		= 42,
+	ZC_DIRECTORY_LENGTH 			= 46,
+
+	ZE_SIGNATURE_OFFSET 			= 0,
+	ZE_DESK_NUMBER 				= 4,
+	ZE_CENTRAL_DIRECTORY_DISK_NUMBER 	= 6,
+	ZE_NUM_ENTRIES_THIS_DISK 		= 8,
+	ZE_NUM_ENTRIES 				= 10,
+	ZE_CENTRAL_DIRECTORY_SIZE 		= 12,
+	ZE_CENTRAL_DIR_OFFSET 			= 16,
+	ZE_ZIP_COMMENT_LENGTH 			= 20,
+	ZE_DIRECTORY_LENGTH 			= 22,
+
+	ZL_REL_OFFSET_CONTENT			= 28,
+	ZL_HEADER_LENGTH			= 30,
+
+	LWS_FZ_ERR_SEEK_END_RECORD		= 1,
+	LWS_FZ_ERR_READ_END_RECORD,
+	LWS_FZ_ERR_END_RECORD_MAGIC,
+	LWS_FZ_ERR_END_RECORD_SANITY,
+	LWS_FZ_ERR_CENTRAL_SEEK,
+	LWS_FZ_ERR_CENTRAL_READ,
+	LWS_FZ_ERR_CENTRAL_SANITY,
+	LWS_FZ_ERR_NAME_TOO_LONG,
+	LWS_FZ_ERR_NAME_SEEK,
+	LWS_FZ_ERR_NAME_READ,
+	LWS_FZ_ERR_CONTENT_SANITY,
+	LWS_FZ_ERR_CONTENT_SEEK,
+	LWS_FZ_ERR_SCAN_SEEK,
+	LWS_FZ_ERR_NOT_FOUND,
+	LWS_FZ_ERR_ZLIB_INIT,
+	LWS_FZ_ERR_READ_CONTENT,
+	LWS_FZ_ERR_SEEK_COMPRESSED,
+};
+
+static uint16_t
+get_u16(void *p)
+{
+	const uint8_t *c = (const uint8_t *)p;
+
+	return (uint16_t)((c[0] | (c[1] << 8)));
+}
+
+static uint32_t
+get_u32(void *p)
+{
+	const uint8_t *c = (const uint8_t *)p;
+
+	return (uint32_t)((c[0] | (c[1] << 8) | (c[2] << 16) | (c[3] << 24)));
+}
+
+int
+lws_fops_zip_scan(lws_fops_zip_t priv, const char *name, int len)
+{
+	lws_filepos_t amount;
+	uint8_t buf[96];
+	int i;
+
+	if (lws_vfs_file_seek_end(priv->zip_fop_fd, -ZE_DIRECTORY_LENGTH) < 0)
+		return LWS_FZ_ERR_SEEK_END_RECORD;
+
+	if (lws_vfs_file_read(priv->zip_fop_fd, &amount, buf,
+			      ZE_DIRECTORY_LENGTH))
+		return LWS_FZ_ERR_READ_END_RECORD;
+
+	if (amount != ZE_DIRECTORY_LENGTH)
+		return LWS_FZ_ERR_READ_END_RECORD;
+
+	/*
+	 * We require the zip to have the last record right at the end
+	 * Linux zip always does this if no zip comment.
+	 */
+	if (buf[0] != 'P' || buf[1] != 'K' || buf[2] != 5 || buf[3] != 6)
+		return LWS_FZ_ERR_END_RECORD_MAGIC;
+
+	i = get_u16(buf + ZE_NUM_ENTRIES);
+
+	if (get_u16(buf + ZE_DESK_NUMBER) ||
+	    get_u16(buf + ZE_CENTRAL_DIRECTORY_DISK_NUMBER) ||
+	    i != get_u16(buf + ZE_NUM_ENTRIES_THIS_DISK))
+		return LWS_FZ_ERR_END_RECORD_SANITY;
+
+	/* end record is OK... look for our file in the central dir */
+
+	if (lws_vfs_file_seek_set(priv->zip_fop_fd,
+				  get_u32(buf + ZE_CENTRAL_DIR_OFFSET)) < 0)
+		return LWS_FZ_ERR_CENTRAL_SEEK;
+
+	while (i--) {
+		priv->content_start = lws_vfs_tell(priv->zip_fop_fd);
+
+		if (lws_vfs_file_read(priv->zip_fop_fd, &amount, buf,
+				      ZC_DIRECTORY_LENGTH))
+			return LWS_FZ_ERR_CENTRAL_READ;
+
+		if (amount != ZC_DIRECTORY_LENGTH)
+			return LWS_FZ_ERR_CENTRAL_READ;
+
+		if (get_u32(buf + ZC_SIGNATURE) != 0x02014B50)
+			return LWS_FZ_ERR_CENTRAL_SANITY;
+
+               lwsl_debug("cstart 0x%lx\n", (unsigned long)priv->content_start);
+
+		priv->hdr.filename_len = get_u16(buf + ZC_FILE_NAME_LENGTH);
+		priv->hdr.extra = get_u16(buf + ZC_EXTRA_FIELD_LENGTH);
+		priv->hdr.filename_start = lws_vfs_tell(priv->zip_fop_fd);
+
+		priv->hdr.method = get_u16(buf + ZC_COMPRESSION_METHOD);
+		priv->hdr.crc32 = get_u32(buf + ZC_CRC32);
+		priv->hdr.comp_size = get_u32(buf + ZC_COMPRESSED_SIZE);
+		priv->hdr.uncomp_size = get_u32(buf + ZC_UNCOMPRESSED_SIZE);
+		priv->hdr.offset = get_u32(buf + ZC_REL_OFFSET_LOCAL_HEADER);
+		priv->hdr.mod_time = get_u32(buf + ZC_LAST_MOD_FILE_TIME);
+		priv->hdr.file_com_len = get_u16(buf + ZC_FILE_COMMENT_LENGTH);
+
+		if (priv->hdr.filename_len != len)
+			goto next;
+
+		if (len >= (int)sizeof(buf) - 1)
+			return LWS_FZ_ERR_NAME_TOO_LONG;
+
+		if (priv->zip_fop_fd->fops->LWS_FOP_READ(priv->zip_fop_fd,
+							&amount, buf, len))
+			return LWS_FZ_ERR_NAME_READ;
+		if ((int)amount != len)
+			return LWS_FZ_ERR_NAME_READ;
+
+		buf[len] = '\0';
+		lwsl_debug("check %s vs %s\n", buf, name);
+
+		if (strcmp((const char *)buf, name))
+			goto next;
+
+		/* we found a match */
+		if (lws_vfs_file_seek_set(priv->zip_fop_fd, priv->hdr.offset) < 0)
+			return LWS_FZ_ERR_NAME_SEEK;
+		if (priv->zip_fop_fd->fops->LWS_FOP_READ(priv->zip_fop_fd,
+							&amount, buf,
+							ZL_HEADER_LENGTH))
+			return LWS_FZ_ERR_NAME_READ;
+		if (amount != ZL_HEADER_LENGTH)
+			return LWS_FZ_ERR_NAME_READ;
+
+		priv->content_start = priv->hdr.offset +
+				      ZL_HEADER_LENGTH +
+				      priv->hdr.filename_len +
+				      get_u16(buf + ZL_REL_OFFSET_CONTENT);
+
+		lwsl_debug("content supposed to start at 0x%lx\n",
+                          (unsigned long)priv->content_start);
+
+		if (priv->content_start > priv->zip_fop_fd->len)
+			return LWS_FZ_ERR_CONTENT_SANITY;
+
+		if (lws_vfs_file_seek_set(priv->zip_fop_fd,
+					  priv->content_start) < 0)
+			return LWS_FZ_ERR_CONTENT_SEEK;
+
+		/* we are aligned at the start of the content */
+
+		priv->exp_uncomp_pos = 0;
+
+		return 0;
+
+next:
+		if (i && lws_vfs_file_seek_set(priv->zip_fop_fd,
+					       priv->content_start +
+					       ZC_DIRECTORY_LENGTH +
+					       priv->hdr.filename_len +
+					       priv->hdr.extra +
+					       priv->hdr.file_com_len) < 0)
+			return LWS_FZ_ERR_SCAN_SEEK;
+	}
+
+	return LWS_FZ_ERR_NOT_FOUND;
+}
+
+static int
+lws_fops_zip_reset_inflate(lws_fops_zip_t priv)
+{
+	if (priv->decompress)
+		inflateEnd(&priv->inflate);
+
+	priv->inflate.zalloc = Z_NULL;
+	priv->inflate.zfree = Z_NULL;
+	priv->inflate.opaque = Z_NULL;
+	priv->inflate.avail_in = 0;
+	priv->inflate.next_in = Z_NULL;
+
+	if (inflateInit2(&priv->inflate, -MAX_WBITS) != Z_OK) {
+		lwsl_err("inflate init failed\n");
+		return LWS_FZ_ERR_ZLIB_INIT;
+	}
+
+	if (lws_vfs_file_seek_set(priv->zip_fop_fd, priv->content_start) < 0)
+		return LWS_FZ_ERR_CONTENT_SEEK;
+
+	priv->exp_uncomp_pos = 0;
+
+	return 0;
+}
+
+static lws_fop_fd_t
+lws_fops_zip_open(const struct lws_plat_file_ops *fops, const char *vfs_path,
+		  const char *vpath, lws_fop_flags_t *flags)
+{
+	lws_fop_flags_t local_flags = 0;
+	lws_fops_zip_t priv;
+	char rp[192];
+	int m;
+
+	/*
+	 * vpath points at the / after the fops signature in vfs_path, eg
+	 * with a vfs_path "/var/www/docs/manual.zip/index.html", vpath
+	 * will come pointing at "/index.html"
+	 */
+
+	priv = lws_zalloc(sizeof(*priv), "fops_zip priv");
+	if (!priv)
+		return NULL;
+
+	priv->fop_fd.fops = &fops_zip;
+
+	m = sizeof(rp) - 1;
+	if ((vpath - vfs_path - 1) < m)
+		m = lws_ptr_diff(vpath, vfs_path) - 1;
+	lws_strncpy(rp, vfs_path, m + 1);
+
+	/* open the zip file itself using the incoming fops, not fops_zip */
+
+	priv->zip_fop_fd = fops->LWS_FOP_OPEN(fops, rp, NULL, &local_flags);
+	if (!priv->zip_fop_fd) {
+		lwsl_err("unable to open zip %s\n", rp);
+		goto bail1;
+	}
+
+	if (*vpath == '/')
+		vpath++;
+
+	m = lws_fops_zip_scan(priv, vpath, (int)strlen(vpath));
+	if (m) {
+		lwsl_err("unable to find record matching '%s' %d\n", vpath, m);
+		goto bail2;
+	}
+
+	/* the directory metadata tells us modification time, so pass it on */
+	priv->fop_fd.mod_time = priv->hdr.mod_time;
+	*flags |= LWS_FOP_FLAG_MOD_TIME_VALID | LWS_FOP_FLAG_VIRTUAL;
+	priv->fop_fd.flags = *flags;
+
+	/* The zip fop_fd is left pointing at the start of the content.
+	 *
+	 * 1) Content could be uncompressed (STORE), and we can always serve
+	 *    that directly
+	 *
+	 * 2) Content could be compressed (GZIP), and the client can handle
+	 *    receiving GZIP... we can wrap it in a GZIP header and trailer
+	 *    and serve the content part directly.  The flag indicating we
+	 *    are providing GZIP directly is set so lws will send the right
+	 *    headers.
+	 *
+	 * 3) Content could be compressed (GZIP) but the client can't handle
+	 *    receiving GZIP... we can decompress it and serve as it is
+	 *    inflated piecemeal.
+	 *
+	 * 4) Content may be compressed some unknown way... fail
+	 *
+	 */
+	if (priv->hdr.method == ZIP_COMPRESSION_METHOD_STORE) {
+		/*
+		 * it is stored uncompressed, leave it indicated as
+		 * uncompressed, and just serve it from inside the
+		 * zip with no gzip container;
+		 */
+
+		lwsl_info("direct zip serving (stored)\n");
+
+		priv->fop_fd.len = priv->hdr.uncomp_size;
+
+		return &priv->fop_fd;
+	}
+
+	if ((*flags & LWS_FOP_FLAG_COMPR_ACCEPTABLE_GZIP) &&
+	    priv->hdr.method == ZIP_COMPRESSION_METHOD_DEFLATE) {
+
+		/*
+		 * We can serve the gzipped file contents directly as gzip
+		 * from inside the zip container; client says it is OK.
+		 *
+		 * To convert to standalone gzip, we have to add a 10-byte
+		 * constant header and a variable 8-byte trailer around the
+		 * content.
+		 *
+		 * The 8-byte trailer is prepared now and held in the priv.
+		 */
+
+		lwsl_info("direct zip serving (gzipped)\n");
+
+		priv->fop_fd.len = sizeof(hd) + priv->hdr.comp_size +
+				   sizeof(priv->u);
+
+		if (lws_is_be()) {
+			uint8_t *p = priv->u.trailer8;
+
+			*p++ = (uint8_t)priv->hdr.crc32;
+			*p++ = (uint8_t)(priv->hdr.crc32 >> 8);
+			*p++ = (uint8_t)(priv->hdr.crc32 >> 16);
+			*p++ = (uint8_t)(priv->hdr.crc32 >> 24);
+			*p++ = (uint8_t)priv->hdr.uncomp_size;
+			*p++ = (uint8_t)(priv->hdr.uncomp_size >> 8);
+			*p++ = (uint8_t)(priv->hdr.uncomp_size >> 16);
+			*p   = (uint8_t)(priv->hdr.uncomp_size >> 24);
+		} else {
+			priv->u.trailer32[0] = priv->hdr.crc32;
+			priv->u.trailer32[1] = priv->hdr.uncomp_size;
+		}
+
+		*flags |= LWS_FOP_FLAG_COMPR_IS_GZIP;
+		priv->fop_fd.flags = *flags;
+		priv->add_gzip_container = 1;
+
+		return &priv->fop_fd;
+	}
+
+	if (priv->hdr.method == ZIP_COMPRESSION_METHOD_DEFLATE) {
+
+		/* we must decompress it to serve it */
+
+		lwsl_info("decompressed zip serving\n");
+
+		priv->fop_fd.len = priv->hdr.uncomp_size;
+
+		if (lws_fops_zip_reset_inflate(priv)) {
+			lwsl_err("inflate init failed\n");
+			goto bail2;
+		}
+
+		priv->decompress = 1;
+
+		return &priv->fop_fd;
+	}
+
+	/* we can't handle it ... */
+
+	lwsl_err("zipped file %s compressed in unknown way (%d)\n", vfs_path,
+		 priv->hdr.method);
+
+bail2:
+	lws_vfs_file_close(&priv->zip_fop_fd);
+bail1:
+	free(priv);
+
+	return NULL;
+}
+
+/* ie, we are closing the fop_fd for the file inside the gzip */
+
+static int
+lws_fops_zip_close(lws_fop_fd_t *fd)
+{
+	lws_fops_zip_t priv = fop_fd_to_priv(*fd);
+
+	if (priv->decompress)
+		inflateEnd(&priv->inflate);
+
+	lws_vfs_file_close(&priv->zip_fop_fd); /* close the gzip fop_fd */
+
+	free(priv);
+	*fd = NULL;
+
+	return 0;
+}
+
+static lws_fileofs_t
+lws_fops_zip_seek_cur(lws_fop_fd_t fd, lws_fileofs_t offset_from_cur_pos)
+{
+	fd->pos += offset_from_cur_pos;
+
+	return fd->pos;
+}
+
+static int
+lws_fops_zip_read(lws_fop_fd_t fd, lws_filepos_t *amount, uint8_t *buf,
+		  lws_filepos_t len)
+{
+	lws_fops_zip_t priv = fop_fd_to_priv(fd);
+	lws_filepos_t ramount, rlen, cur = lws_vfs_tell(fd);
+	int ret;
+
+	if (priv->decompress) {
+
+		if (priv->exp_uncomp_pos != fd->pos) {
+			/*
+			 *  there has been a seek in the uncompressed fop_fd
+			 * we have to restart the decompression and loop eating
+			 * the decompressed data up to the seek point
+			 */
+			lwsl_info("seek in decompressed\n");
+
+			lws_fops_zip_reset_inflate(priv);
+
+			while (priv->exp_uncomp_pos != fd->pos) {
+				rlen = len;
+				if (rlen > fd->pos - priv->exp_uncomp_pos)
+					rlen = fd->pos - priv->exp_uncomp_pos;
+				if (lws_fops_zip_read(fd, amount, buf, rlen))
+					return LWS_FZ_ERR_SEEK_COMPRESSED;
+			}
+			*amount = 0;
+		}
+
+		priv->inflate.avail_out = (unsigned int)len;
+		priv->inflate.next_out = buf;
+
+spin:
+		if (!priv->inflate.avail_in) {
+			rlen = sizeof(priv->rbuf);
+			if (rlen > priv->hdr.comp_size -
+				   (cur - priv->content_start))
+				rlen = priv->hdr.comp_size -
+				       (priv->hdr.comp_size -
+					priv->content_start);
+
+			if (priv->zip_fop_fd->fops->LWS_FOP_READ(
+					priv->zip_fop_fd, &ramount, priv->rbuf,
+					rlen))
+				return LWS_FZ_ERR_READ_CONTENT;
+
+			cur += ramount;
+
+			priv->inflate.avail_in = (unsigned int)ramount;
+			priv->inflate.next_in = priv->rbuf;
+		}
+
+		ret = inflate(&priv->inflate, Z_NO_FLUSH);
+		if (ret == Z_STREAM_ERROR)
+			return ret;
+
+		switch (ret) {
+		case Z_NEED_DICT:
+			ret = Z_DATA_ERROR;
+			/* fallthru */
+		case Z_DATA_ERROR:
+		case Z_MEM_ERROR:
+
+			return ret;
+		}
+
+		if (!priv->inflate.avail_in && priv->inflate.avail_out &&
+		     cur != priv->content_start + priv->hdr.comp_size)
+			goto spin;
+
+		*amount = len - priv->inflate.avail_out;
+
+		priv->exp_uncomp_pos += *amount;
+		fd->pos += *amount;
+
+		return 0;
+	}
+
+	if (priv->add_gzip_container) {
+
+		lwsl_info("%s: gzip + container\n", __func__);
+		*amount = 0;
+
+		/* place the canned header at the start */
+
+		if (len && fd->pos < sizeof(hd)) {
+			rlen = sizeof(hd) - fd->pos;
+			if (rlen > len)
+				rlen = len;
+			/* provide stuff from canned header */
+			memcpy(buf, hd + fd->pos, (size_t)rlen);
+			fd->pos += rlen;
+			buf += rlen;
+			len -= rlen;
+			*amount += rlen;
+		}
+
+		/* serve gzipped data direct from zipfile */
+
+		if (len && fd->pos >= sizeof(hd) &&
+		    fd->pos < priv->hdr.comp_size + sizeof(hd)) {
+
+			rlen = priv->hdr.comp_size - (priv->zip_fop_fd->pos -
+						      priv->content_start);
+			if (rlen > len)
+				rlen = len;
+
+			if (rlen &&
+			    priv->zip_fop_fd->pos < (priv->hdr.comp_size +
+					    	     priv->content_start)) {
+				if (lws_vfs_file_read(priv->zip_fop_fd,
+						      &ramount, buf, rlen))
+					return LWS_FZ_ERR_READ_CONTENT;
+				*amount += ramount;
+				fd->pos += ramount; // virtual pos
+				buf += ramount;
+				len -= ramount;
+			}
+		}
+
+		/* place the prepared trailer at the end */
+
+		if (len && fd->pos >= priv->hdr.comp_size + sizeof(hd) &&
+		    fd->pos < priv->hdr.comp_size + sizeof(hd) +
+		    	      sizeof(priv->u)) {
+			cur = fd->pos - priv->hdr.comp_size - sizeof(hd);
+			rlen = sizeof(priv->u) - cur;
+			if (rlen > len)
+				rlen = len;
+
+			memcpy(buf, priv->u.trailer8 + cur, (size_t)rlen);
+
+			*amount += rlen;
+			fd->pos += rlen;
+		}
+
+		return 0;
+	}
+
+	lwsl_info("%s: store\n", __func__);
+
+	if (len > priv->hdr.uncomp_size - (cur - priv->content_start))
+		len = priv->hdr.comp_size - (priv->hdr.comp_size -
+					     priv->content_start);
+
+	if (priv->zip_fop_fd->fops->LWS_FOP_READ(priv->zip_fop_fd,
+						 amount, buf, len))
+		return LWS_FZ_ERR_READ_CONTENT;
+
+	return 0;
+}
+
+struct lws_plat_file_ops fops_zip = {
+	lws_fops_zip_open,
+	lws_fops_zip_close,
+	lws_fops_zip_seek_cur,
+	lws_fops_zip_read,
+	NULL,
+	{ { ".zip/", 5 }, { ".jar/", 5 }, { ".war/", 5 } },
+	NULL,
+};