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libwebsockets/lib/extension-deflate-frame.c
Andy Green 5449511d3e remove fixed rx buffer allow definition per protocol 
A new protocol member is defined that controls the size of rx
buffer allocation per connection.  For compatibility 0 size
allocates 4096, but you should adapt your protocol definition
array in the user code to declare an appropriate value.

See the changelog for more detail.

The advantage is the rx frame buffer size is now tailored to
what is expected from the protocol, rather than being fixed
to a default of 4096.  If your protocol only sends frames of
a dozen bytes this allows you to only allocate an rx frame
buffer of the same size.

For example the per-connection allocation (excluding headers)
for the test server fell from ~4500 to < 750 bytes with this.

Signed-off-by: Andy Green <andy.green@linaro.org>
2013-02-08 13:16:07 +08:00

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#include "private-libwebsockets.h"
#include "extension-deflate-frame.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#define LWS_ZLIB_WINDOW_BITS 15
#define LWS_ZLIB_MEMLEVEL 8
#define MIN_SIZE_TO_DEFLATE 4
int lws_extension_callback_deflate_frame(
struct libwebsocket_context *context,
struct libwebsocket_extension *ext,
struct libwebsocket *wsi,
enum libwebsocket_extension_callback_reasons reason,
void *user, void *in, size_t len)
{
struct lws_ext_deflate_frame_conn *conn =
(struct lws_ext_deflate_frame_conn *)user;
struct lws_tokens *eff_buf = (struct lws_tokens *)in;
size_t current_payload, remaining_payload, total_payload;
int n;
size_t len_so_far;
switch (reason) {
/*
* for deflate-frame, both client and server sides act the same
*/
case LWS_EXT_CALLBACK_CLIENT_CONSTRUCT:
case LWS_EXT_CALLBACK_CONSTRUCT:
conn->zs_in.zalloc = conn->zs_out.zalloc = Z_NULL;
conn->zs_in.zfree = conn->zs_out.zfree = Z_NULL;
conn->zs_in.opaque = conn->zs_out.opaque = Z_NULL;
n = inflateInit2(&conn->zs_in, -LWS_ZLIB_WINDOW_BITS);
if (n != Z_OK) {
lwsl_ext("deflateInit returned %d\n", n);
return 1;
}
n = deflateInit2(&conn->zs_out,
(context->listen_port ?
DEFLATE_FRAME_COMPRESSION_LEVEL_SERVER :
DEFLATE_FRAME_COMPRESSION_LEVEL_CLIENT),
Z_DEFLATED,
-LWS_ZLIB_WINDOW_BITS, LWS_ZLIB_MEMLEVEL,
Z_DEFAULT_STRATEGY);
if (n != Z_OK) {
lwsl_ext("deflateInit2 returned %d\n", n);
return 1;
}
conn->buf_pre_used = 0;
conn->buf_pre_length = 0;
conn->buf_in_length = sizeof conn->buf_in;;
conn->buf_out_length = sizeof conn->buf_out;
conn->compressed_out = 0;
conn->buf_pre = NULL;
conn->buf_in = (unsigned char *)
malloc(LWS_SEND_BUFFER_PRE_PADDING +
conn->buf_in_length +
LWS_SEND_BUFFER_POST_PADDING);
if (!conn->buf_in)
goto bail;
conn->buf_out = (unsigned char *)
malloc(LWS_SEND_BUFFER_PRE_PADDING +
conn->buf_out_length +
LWS_SEND_BUFFER_POST_PADDING);
if (!conn->buf_out)
goto bail;
lwsl_ext("zlibs constructed\n");
break;
bail:
lwsl_err("Out of mem\n");
(void)inflateEnd(&conn->zs_in);
(void)deflateEnd(&conn->zs_out);
return -1;
case LWS_EXT_CALLBACK_DESTROY:
if (conn->buf_pre)
free(conn->buf_pre);
free(conn->buf_in);
free(conn->buf_out);
conn->buf_pre_used = 0;
conn->buf_pre_length = 0;
conn->buf_in_length = 0;
conn->buf_out_length = 0;
conn->compressed_out = 0;
(void)inflateEnd(&conn->zs_in);
(void)deflateEnd(&conn->zs_out);
lwsl_ext("zlibs destructed\n");
break;
case LWS_EXT_CALLBACK_PAYLOAD_RX:
if (!(wsi->u.ws.rsv & 0x40))
return 0;
/*
* inflate the incoming payload
*/
current_payload = eff_buf->token_len;
remaining_payload = wsi->u.ws.rx_packet_length;
if (remaining_payload) {
total_payload = conn->buf_pre_used +
current_payload +
remaining_payload;
if (conn->buf_pre_length < total_payload) {
conn->buf_pre_length = total_payload;
if (conn->buf_pre)
free(conn->buf_pre);
conn->buf_pre =
(unsigned char *)malloc(total_payload + 4);
if (!conn->buf_pre) {
lwsl_err("Out of memory\n");
return -1;
}
}
memcpy(conn->buf_pre + conn->buf_pre_used,
eff_buf->token, current_payload);
conn->buf_pre_used += current_payload;
eff_buf->token = NULL;
eff_buf->token_len = 0;
return 0;
}
if (conn->buf_pre_used) {
total_payload = conn->buf_pre_used +
current_payload;
memcpy(conn->buf_pre + conn->buf_pre_used,
eff_buf->token, current_payload);
conn->buf_pre_used = 0;
conn->zs_in.next_in = conn->buf_pre;
} else {
total_payload = current_payload;
conn->zs_in.next_in = (unsigned char *)eff_buf->token;
}
conn->zs_in.next_in[total_payload + 0] = 0;
conn->zs_in.next_in[total_payload + 1] = 0;
conn->zs_in.next_in[total_payload + 2] = 0xff;
conn->zs_in.next_in[total_payload + 3] = 0xff;
conn->zs_in.avail_in = total_payload + 4;
conn->zs_in.next_out = conn->buf_in + LWS_SEND_BUFFER_PRE_PADDING;
conn->zs_in.avail_out = conn->buf_in_length;
while (1) {
n = inflate(&conn->zs_in, Z_SYNC_FLUSH);
switch (n) {
case Z_NEED_DICT:
case Z_STREAM_ERROR:
case Z_DATA_ERROR:
case Z_MEM_ERROR:
/*
* screwed.. close the connection... we will get a
* destroy callback to take care of closing nicely
*/
lwsl_err("zlib error inflate %d: %s\n",
n, conn->zs_in.msg);
return -1;
}
if (conn->zs_in.avail_out)
break;
len_so_far = conn->zs_in.next_out -
(conn->buf_in + LWS_SEND_BUFFER_PRE_PADDING);
conn->buf_in_length *= 2;
if (conn->buf_in_length > LWS_MAX_ZLIB_CONN_BUFFER) {
lwsl_ext("zlib in buffer tried to exceed "
"max allowed of %u\n",
LWS_MAX_ZLIB_CONN_BUFFER);
return -1;
}
conn->buf_in = (unsigned char *)realloc(conn->buf_in,
LWS_SEND_BUFFER_PRE_PADDING +
conn->buf_in_length +
LWS_SEND_BUFFER_POST_PADDING);
if (!conn->buf_in) {
lwsl_err("Out of memory\n");
return -1;
}
lwsl_debug(
"deflate-frame ext RX did realloc to %ld\n",
conn->buf_in_length);
conn->zs_in.next_out = conn->buf_in +
LWS_SEND_BUFFER_PRE_PADDING + len_so_far;
conn->zs_in.avail_out =
conn->buf_in_length - len_so_far;
}
/* rewrite the buffer pointers and length */
eff_buf->token = (char *)(conn->buf_in + LWS_SEND_BUFFER_PRE_PADDING);
eff_buf->token_len = (int)(conn->zs_in.next_out -
(conn->buf_in + LWS_SEND_BUFFER_PRE_PADDING));
return 0;
case LWS_EXT_CALLBACK_PAYLOAD_TX:
/*
* deflate the outgoing payload
*/
current_payload = eff_buf->token_len;
if (current_payload < MIN_SIZE_TO_DEFLATE)
return 0;
conn->zs_out.next_in = (unsigned char *)eff_buf->token;
conn->zs_out.avail_in = current_payload;
conn->zs_out.next_out = conn->buf_out + LWS_SEND_BUFFER_PRE_PADDING;
conn->zs_out.avail_out = conn->buf_out_length;
while (1) {
n = deflate(&conn->zs_out, Z_SYNC_FLUSH);
if (n == Z_STREAM_ERROR) {
/*
* screwed.. close the connection... we will get a
* destroy callback to take care of closing nicely
*/
lwsl_ext("zlib error deflate\n");
return -1;
}
if (conn->zs_out.avail_out)
break;
len_so_far = (conn->zs_out.next_out -
(conn->buf_out +
LWS_SEND_BUFFER_PRE_PADDING));
conn->buf_out_length *= 2;
if (conn->buf_out_length > LWS_MAX_ZLIB_CONN_BUFFER) {
lwsl_ext("zlib out buffer tried to exceed "
"max allowed of %u\n",
LWS_MAX_ZLIB_CONN_BUFFER);
return -1;
}
conn->buf_out = (unsigned char *)realloc(
conn->buf_out,
LWS_SEND_BUFFER_PRE_PADDING +
conn->buf_out_length +
LWS_SEND_BUFFER_POST_PADDING);
if (!conn->buf_out) {
lwsl_err("Out of memory\n");
return -1;
}
lwsl_debug(
"deflate-frame ext TX did realloc to %ld\n",
conn->buf_in_length);
conn->zs_out.next_out = (conn->buf_out +
LWS_SEND_BUFFER_PRE_PADDING + len_so_far);
conn->zs_out.avail_out =
(conn->buf_out_length - len_so_far);
}
conn->compressed_out = 1;
/* rewrite the buffer pointers and length */
eff_buf->token = (char *)(conn->buf_out +
LWS_SEND_BUFFER_PRE_PADDING);
eff_buf->token_len = (int)(conn->zs_out.next_out -
(conn->buf_out + LWS_SEND_BUFFER_PRE_PADDING)) - 4;
return 0;
case LWS_EXT_CALLBACK_PACKET_TX_PRESEND:
if (conn->compressed_out) {
conn->compressed_out = 0;
*((unsigned char *)eff_buf->token) |= 0x40;
}
break;
case LWS_EXT_CALLBACK_CHECK_OK_TO_PROPOSE_EXTENSION:
/* Avoid x-webkit-deflate-frame extension on client */
if (!strcmp((char *)in, "x-webkit-deflate-frame"))
return 1;
break;
default:
break;
}
return 0;
}
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