James Gallagher's Content-Encoding work

lib/content_encoding.c

@@ -0,0 +1,122 @@
+/*****************************************************************************
+ *                                  _   _ ____  _     
+ *  Project                     ___| | | |  _ \| |    
+ *                             / __| | | | |_) | |    
+ *                            | (__| |_| |  _ <| |___ 
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2002, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * In order to be useful for every potential user, curl and libcurl are
+ * dual-licensed under the MPL and the MIT/X-derivate licenses.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the MPL or the MIT/X-derivate
+ * licenses. You may pick one of these licenses.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * $Id$
+ *****************************************************************************/
+
+#include "setup.h"
+
+#ifdef HAVE_LIBZ
+
+#include "urldata.h"
+#include <curl/curl.h>
+#include <curl/types.h>
+#include "sendf.h"
+
+#define DSIZ 4096               /* buffer size for decompressed data */
+
+
+static CURLcode
+process_zlib_error(struct SessionHandle *data, z_stream *z)
+{
+  if (z->msg)
+    failf (data, "Error while processing content unencoding.\n%s",
+           z->msg);
+  else
+    failf (data, "Error while processing content unencoding.\n"
+           "Unknown failure within decompression software.");
+
+  return CURLE_BAD_CONTENT_ENCODING;
+}
+
+static CURLcode
+exit_zlib(z_stream *z, bool *zlib_init, CURLcode result)
+{
+  inflateEnd(z);
+  *zlib_init = 0;
+  return result;
+}
+
+CURLcode
+Curl_unencode_deflate_write(struct SessionHandle *data, 
+                            struct Curl_transfer_keeper *k,
+                            ssize_t nread)
+{
+  int status;                   /* zlib status */
+  int result;                   /* Curl_client_write status */
+  char decomp[DSIZ];            /* Put the decompressed data here. */
+  z_stream *z = &k->z;          /* zlib state structure */
+              
+  /* Initialize zlib? */
+  if (!k->zlib_init) {
+    z->zalloc = (alloc_func)Z_NULL;
+    z->zfree = (free_func)Z_NULL;
+    z->opaque = 0;              /* of dubious use 08/27/02 jhrg */
+    if (inflateInit(z) != Z_OK)
+      return process_zlib_error(data, z);
+    k->zlib_init = 1;
+  }
+
+  /* Set the compressed input when this fucntion is called */
+  z->next_in = (Bytef *)k->str;
+  z->avail_in = nread;
+
+  /* because the buffer size is fixed, iteratively decompress
+     and transfer to the client via client_write. */
+  for (;;) {
+    /* (re)set buffer for decompressed output for every iteration */
+    z->next_out = (Bytef *)&decomp[0];
+    z->avail_out = DSIZ;
+
+    status = inflate(z, Z_SYNC_FLUSH);
+    if (status == Z_OK || status == Z_STREAM_END) {
+      result = Curl_client_write(data, CLIENTWRITE_BODY, decomp, 
+                                 DSIZ - z->avail_out);
+      /* if !CURLE_OK, clean up, return */
+      if (result) {              
+        return exit_zlib(z, &k->zlib_init, result);
+      }
+
+      /* Done?; clean up, return */
+      if (status == Z_STREAM_END) {
+        if (inflateEnd(z) == Z_OK)
+          return exit_zlib(z, &k->zlib_init, result);
+        else
+          return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
+      }
+
+      /* Done with these bytes, exit */
+      if (status == Z_OK && z->avail_in == 0 && z->avail_out > 0) 
+        return result;
+    }
+    else {                      /* Error; exit loop, handle below */
+      return exit_zlib(z, &k->zlib_init, process_zlib_error(data, z));
+    }
+  }
+}
+#endif /* HAVE_LIBZ */
+
+/*
+ * local variables:
+ * eval: (load-file "../curl-mode.el")
+ * end:
+ * vim600: fdm=marker
+ * vim: et sw=2 ts=2 sts=2 tw=78
+ */