From 465e19dbe9603bacba53bd73a607d5fbb37c08a4 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Tue, 12 Jul 2005 18:15:34 +0000
Subject: Adrian Schuur added trailer support in the chunked encoding stream.
 The trailer is then sent to the normal header callback/stream.

---
 lib/http_chunks.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 69 insertions(+), 4 deletions(-)

(limited to 'lib/http_chunks.c')

diff --git a/lib/http_chunks.c b/lib/http_chunks.c
index f333f9559..63e136cb7 100644
--- a/lib/http_chunks.c
+++ b/lib/http_chunks.c
@@ -153,10 +153,17 @@ CHUNKcode Curl_httpchunk_read(struct connectdata *conn,
       if(*datap == '\n') {
         /* we're now expecting data to come, unless size was zero! */
         if(0 == ch->datasize) {
-          ch->state = CHUNK_STOP; /* stop reading! */
-          if(1 == length) {
-            /* This was the final byte, return right now */
-            return CHUNKE_STOP;
+          if (conn->bits.trailerHdrPresent!=TRUE) {
+            /* No Trailer: header found - revert to original Curl processing */
+            ch->state = CHUNK_STOP;
+            if (1 == length) {
+               /* This is the final byte, return right now */
+               return CHUNKE_STOP;
+            }
+          }
+          else {
+            ch->state = CHUNK_TRAILER; /* attempt to read trailers */
+            conn->trlPos=0;
           }
         }
         else
@@ -250,6 +257,64 @@ CHUNKcode Curl_httpchunk_read(struct connectdata *conn,
         return CHUNKE_BAD_CHUNK;
       break;
 
+    case CHUNK_TRAILER:
+      /* conn->trailer is assumed to be freed in url.c on a
+         connection basis */
+      if (conn->trlPos >= conn->trlMax) {
+        char *ptr;
+        if(conn->trlMax) {
+          conn->trlMax *= 2;
+          ptr = (char*)realloc(conn->trailer,conn->trlMax);
+        }
+        else {
+          conn->trlMax=128;
+          ptr = (char*)malloc(conn->trlMax);
+        }
+        if(!ptr)
+          return CHUNKE_OUT_OF_MEMORY;
+        conn->trailer = ptr;
+      }
+      conn->trailer[conn->trlPos++]=*datap;
+
+      if(*datap == '\r')
+        ch->state = CHUNK_TRAILER_CR;
+      else {
+        datap++;
+        length--;
+     }
+      break;
+
+    case CHUNK_TRAILER_CR:
+      if(*datap == '\r') {
+        ch->state = CHUNK_TRAILER_POSTCR;
+        datap++;
+        length--;
+      }
+      else
+        return CHUNKE_BAD_CHUNK;
+      break;
+
+    case CHUNK_TRAILER_POSTCR:
+      if (*datap == '\n') {
+        conn->trailer[conn->trlPos++]='\n';
+        conn->trailer[conn->trlPos]=0;
+        if (conn->trlPos==2) {
+          ch->state = CHUNK_STOP;
+          return CHUNKE_STOP;
+        }
+        else {
+          Curl_client_write(conn->data, CLIENTWRITE_HEADER,
+                            conn->trailer, conn->trlPos);
+        }
+        ch->state = CHUNK_TRAILER;
+        conn->trlPos=0;
+        datap++;
+        length--;
+      }
+      else
+        return CHUNKE_BAD_CHUNK;
+      break;
+
     case CHUNK_STOP:
       /* If we arrive here, there is data left in the end of the buffer
          even if there's no more chunks to read */
-- 
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