1 files changed, 113 insertions, 0 deletions
diff --git a/web/server/h2o/libh2o/lib/handler/chunked.c b/web/server/h2o/libh2o/lib/handler/chunked.c
new file mode 100644
index 00000000..b6ad4346
--- /dev/null
+++ b/web/server/h2o/libh2o/lib/handler/chunked.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2014 DeNA Co., Ltd.
+ *
+ * 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.
+ */
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "h2o.h"
+
+typedef struct st_chunked_encoder_t {
+    h2o_ostream_t super;
+    char buf[64];
+} chunked_encoder_t;
+
+static void send_chunk(h2o_ostream_t *_self, h2o_req_t *req, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state)
+{
+    chunked_encoder_t *self = (void *)_self;
+    h2o_iovec_t *outbufs = alloca(sizeof(h2o_iovec_t) * (inbufcnt + 2));
+    size_t chunk_size, outbufcnt = 0, i;
+
+    /* calc chunk size */
+    chunk_size = 0;
+    for (i = 0; i != inbufcnt; ++i)
+        chunk_size += inbufs[i].len;
+    req->bytes_sent += chunk_size;
+
+    /* create chunk header and output data */
+    if (chunk_size != 0) {
+        outbufs[outbufcnt].base = self->buf;
+        outbufs[outbufcnt].len = sprintf(self->buf, "%zx\r\n", chunk_size);
+        assert(outbufs[outbufcnt].len < sizeof(self->buf));
+        outbufcnt++;
+        memcpy(outbufs + outbufcnt, inbufs, sizeof(h2o_iovec_t) * inbufcnt);
+        outbufcnt += inbufcnt;
+        if (state != H2O_SEND_STATE_ERROR) {
+            outbufs[outbufcnt].base = "\r\n0\r\n\r\n";
+            outbufs[outbufcnt].len = state == H2O_SEND_STATE_FINAL ? 7 : 2;
+            outbufcnt++;
+        }
+    } else if (state == H2O_SEND_STATE_FINAL) {
+        outbufs[outbufcnt].base = "0\r\n\r\n";
+        outbufs[outbufcnt].len = 5;
+        outbufcnt++;
+    }
+
+    /* if state is error, send a broken chunk to pass the error down to the browser */
+    if (state == H2O_SEND_STATE_ERROR) {
+        outbufs[outbufcnt].base = "\r\n1\r\n";
+        outbufs[outbufcnt].len = 5;
+        outbufcnt++;
+    }
+
+    h2o_ostream_send_next(&self->super, req, outbufs, outbufcnt, state);
+}
+
+static void on_setup_ostream(h2o_filter_t *self, h2o_req_t *req, h2o_ostream_t **slot)
+{
+    chunked_encoder_t *encoder;
+
+    /* do nothing if not HTTP/1.1 or content-length is known */
+    if (req->res.content_length != SIZE_MAX || req->version != 0x101)
+        goto Next;
+    /* RFC 2616 4.4 states that the following status codes (and response to a HEAD method) should not include message body */
+    if ((100 <= req->res.status && req->res.status <= 199) || req->res.status == 204 || req->res.status == 304)
+        goto Next;
+    else if (h2o_memis(req->input.method.base, req->input.method.len, H2O_STRLIT("HEAD")))
+        goto Next;
+    /* we cannot handle certain responses (like 101 switching protocols) */
+    if (req->res.status != 200) {
+        req->http1_is_persistent = 0;
+        goto Next;
+    }
+    /* skip if content-encoding header is being set */
+    if (h2o_find_header(&req->res.headers, H2O_TOKEN_TRANSFER_ENCODING, -1) != -1)
+        goto Next;
+
+    /* set content-encoding header */
+    h2o_add_header(&req->pool, &req->res.headers, H2O_TOKEN_TRANSFER_ENCODING, NULL, H2O_STRLIT("chunked"));
+
+    /* set the flag that tells finalostream that req->bytes_sent is already counted */
+    req->bytes_counted_by_ostream = 1;
+
+    /* setup filter */
+    encoder = (void *)h2o_add_ostream(req, sizeof(chunked_encoder_t), slot);
+    encoder->super.do_send = send_chunk;
+    slot = &encoder->super.next;
+
+Next:
+    h2o_setup_next_ostream(req, slot);
+}
+
+void h2o_chunked_register(h2o_pathconf_t *pathconf)
+{
+    h2o_filter_t *self = h2o_create_filter(pathconf, sizeof(*self));
+    self->on_setup_ostream = on_setup_ostream;
+}