[epiphany/wip/google-safe-browsing] safe-browsing: Add support for Rice compression scheme



commit aa0f03dddc63082e38a15ce98d7f0412cb7dd7cc
Author: Gabriel Ivascu <gabrielivascu gnome org>
Date:   Fri Sep 22 00:32:44 2017 +0300

    safe-browsing: Add support for Rice compression scheme
    
    https://developers.google.com/safe-browsing/v4/compression

 lib/safe-browsing/ephy-gsb-service.c |    9 +--
 lib/safe-browsing/ephy-gsb-storage.c |  179 ++++++++++++++++++++++++----------
 lib/safe-browsing/ephy-gsb-storage.h |    5 +-
 lib/safe-browsing/ephy-gsb-utils.c   |  162 ++++++++++++++++++++++++++++++-
 lib/safe-browsing/ephy-gsb-utils.h   |   10 ++-
 5 files changed, 300 insertions(+), 65 deletions(-)
---
diff --git a/lib/safe-browsing/ephy-gsb-service.c b/lib/safe-browsing/ephy-gsb-service.c
index 4e01e7e..0c76a4c 100644
--- a/lib/safe-browsing/ephy-gsb-service.c
+++ b/lib/safe-browsing/ephy-gsb-service.c
@@ -268,9 +268,7 @@ ephy_gsb_service_update_thread (GTask          *task,
       JsonArray *removals = json_object_get_array_member (lur, "removals");
       for (guint k = 0; k < json_array_get_length (removals); k++) {
         JsonObject *tes = json_array_get_object_element (removals, k);
-        JsonObject *raw_indices = json_object_get_object_member (tes, "rawIndices");
-        JsonArray *indices = json_object_get_array_member (raw_indices, "indices");
-        ephy_gsb_storage_delete_hash_prefixes (self->storage, list, indices);
+        ephy_gsb_storage_delete_hash_prefixes (self->storage, list, tes);
       }
     }
 
@@ -279,10 +277,7 @@ ephy_gsb_service_update_thread (GTask          *task,
       JsonArray *additions = json_object_get_array_member (lur, "additions");
       for (guint k = 0; k < json_array_get_length (additions); k++) {
         JsonObject *tes = json_array_get_object_element (additions, k);
-        JsonObject *raw_hashes = json_object_get_object_member (tes, "rawHashes");
-        gint64 prefix_size = json_object_get_int_member (raw_hashes, "prefixSize");
-        const char *hashes = json_object_get_string_member (raw_hashes, "rawHashes");
-        ephy_gsb_storage_insert_hash_prefixes (self->storage, list, prefix_size, hashes);
+        ephy_gsb_storage_insert_hash_prefixes (self->storage, list, tes);
       }
     }
 
diff --git a/lib/safe-browsing/ephy-gsb-storage.c b/lib/safe-browsing/ephy-gsb-storage.c
index 84affd4..984f260 100644
--- a/lib/safe-browsing/ephy-gsb-storage.c
+++ b/lib/safe-browsing/ephy-gsb-storage.c
@@ -899,11 +899,11 @@ ephy_gsb_storage_make_delete_hash_prefix_statement (EphyGSBStorage *self,
 }
 
 static GList *
-ephy_gsb_storage_delete_hash_prefix_batch (EphyGSBStorage      *self,
-                                           EphyGSBThreatList   *list,
-                                           GList               *prefixes,
-                                           gsize                num_prefixes,
-                                           EphySQLiteStatement *stmt)
+ephy_gsb_storage_delete_hash_prefixes_batch (EphyGSBStorage      *self,
+                                             EphyGSBThreatList   *list,
+                                             GList               *prefixes,
+                                             gsize                num_prefixes,
+                                             EphySQLiteStatement *stmt)
 {
   EphySQLiteStatement *statement = NULL;
   GError *error = NULL;
@@ -953,10 +953,11 @@ out:
   return prefixes;
 }
 
-void
-ephy_gsb_storage_delete_hash_prefixes (EphyGSBStorage    *self,
-                                       EphyGSBThreatList *list,
-                                       JsonArray         *indices)
+static void
+ephy_gsb_storage_delete_hash_prefixes_internal (EphyGSBStorage    *self,
+                                                EphyGSBThreatList *list,
+                                                guint32           *indices,
+                                                gsize              num_indices)
 {
   EphySQLiteStatement *statement = NULL;
   GList *prefixes = NULL;
@@ -969,12 +970,12 @@ ephy_gsb_storage_delete_hash_prefixes (EphyGSBStorage    *self,
   g_assert (list);
   g_assert (indices);
 
-  LOG ("Deleting %u hash prefixes...", json_array_get_length (indices));
+  LOG ("Deleting %lu hash prefixes...", num_indices);
 
   /* Move indices from the JSON array to a hash table set. */
   set = g_hash_table_new (g_direct_hash, g_direct_equal);
-  for (guint i = 0; i < json_array_get_length (indices); i++)
-    g_hash_table_add (set, GINT_TO_POINTER (json_array_get_int_element (indices, i)));
+  for (gsize i = 0; i < num_indices; i++)
+    g_hash_table_add (set, GUINT_TO_POINTER (indices[i]));
 
   prefixes = ephy_gsb_storage_get_hash_prefixes_to_delete (self, list, set, &num_prefixes);
   head = prefixes;
@@ -986,16 +987,16 @@ ephy_gsb_storage_delete_hash_prefixes (EphyGSBStorage    *self,
     statement = ephy_gsb_storage_make_delete_hash_prefix_statement (self, BATCH_SIZE);
 
     for (gsize i = 0; i < num_prefixes / BATCH_SIZE; i++) {
-      head = ephy_gsb_storage_delete_hash_prefix_batch (self, list,
-                                                        head, BATCH_SIZE,
-                                                        statement);
+      head = ephy_gsb_storage_delete_hash_prefixes_batch (self, list,
+                                                          head, BATCH_SIZE,
+                                                          statement);
     }
   }
 
   if (num_prefixes % BATCH_SIZE != 0) {
-    ephy_gsb_storage_delete_hash_prefix_batch (self, list,
-                                               head, num_prefixes % BATCH_SIZE,
-                                               NULL);
+    ephy_gsb_storage_delete_hash_prefixes_batch (self, list,
+                                                 head, num_prefixes % BATCH_SIZE,
+                                                 NULL);
   }
 
   ephy_gsb_storage_end_transaction (self);
@@ -1006,6 +1007,42 @@ ephy_gsb_storage_delete_hash_prefixes (EphyGSBStorage    *self,
     g_object_unref (statement);
 }
 
+void
+ephy_gsb_storage_delete_hash_prefixes (EphyGSBStorage    *self,
+                                       EphyGSBThreatList *list,
+                                       JsonObject        *tes)
+{
+  JsonObject *raw_indices;
+  JsonObject *rice_indices;
+  JsonArray *indices_arr;
+  const char *compression;
+  guint32 *indices;
+  gsize num_indices;
+
+  g_assert (EPHY_IS_GSB_STORAGE (self));
+  g_assert (self->is_operable);
+  g_assert (list);
+  g_assert (tes);
+
+  compression = json_object_get_string_member (tes, "compressionType");
+  if (!g_strcmp0 (compression, GSB_COMPRESSION_TYPE_RICE)) {
+    rice_indices = json_object_get_object_member (tes, "riceIndices");
+    indices = ephy_gsb_utils_rice_delta_decode (rice_indices, &num_indices);
+  } else {
+    raw_indices = json_object_get_object_member (tes, "rawIndices");
+    indices_arr = json_object_get_array_member (raw_indices, "indices");
+    num_indices = json_array_get_length (indices_arr);
+
+    indices = g_malloc (num_indices * sizeof (guint));
+    for (guint i = 0; i < num_indices; i++)
+      indices[i] = json_array_get_int_element (indices_arr, i);
+  }
+
+  ephy_gsb_storage_delete_hash_prefixes_internal (self, list, indices, num_indices);
+
+  g_free (indices);
+}
+
 static EphySQLiteStatement *
 ephy_gsb_storage_make_insert_hash_prefix_statement (EphyGSBStorage *self,
                                                     gsize           num_prefixes)
@@ -1036,13 +1073,13 @@ ephy_gsb_storage_make_insert_hash_prefix_statement (EphyGSBStorage *self,
 }
 
 static void
-ephy_gsb_storage_insert_hash_prefix_batch (EphyGSBStorage      *self,
-                                           EphyGSBThreatList   *list,
-                                           const guint8        *prefixes,
-                                           gsize                start,
-                                           gsize                end,
-                                           gsize                len,
-                                           EphySQLiteStatement *stmt)
+ephy_gsb_storage_insert_hash_prefixes_batch (EphyGSBStorage      *self,
+                                             EphyGSBThreatList   *list,
+                                             const guint8        *prefixes,
+                                             gsize                start,
+                                             gsize                end,
+                                             gsize                len,
+                                             EphySQLiteStatement *stmt)
 {
   EphySQLiteStatement *statement = NULL;
   GError *error = NULL;
@@ -1065,7 +1102,7 @@ ephy_gsb_storage_insert_hash_prefix_batch (EphyGSBStorage      *self,
   }
 
   for (gsize k = start; k < end; k += len) {
-    if (!ephy_sqlite_statement_bind_blob (statement, id++, prefixes + k, GSB_CUE_LEN, NULL) ||
+    if (!ephy_sqlite_statement_bind_blob (statement, id++, prefixes + k, GSB_HASH_CUE_LEN, NULL) ||
         !ephy_sqlite_statement_bind_blob (statement, id++, prefixes + k, len, NULL) ||
         !bind_threat_list_params (statement, list, id, id + 1, id + 2, -1)) {
       g_warning ("Failed to bind values in hash prefix statement");
@@ -1085,60 +1122,98 @@ out:
     g_object_unref (statement);
 }
 
-void
-ephy_gsb_storage_insert_hash_prefixes (EphyGSBStorage    *self,
-                                       EphyGSBThreatList *list,
-                                       gsize              prefix_len,
-                                       const char        *prefixes_b64)
+static void
+ephy_gsb_storage_insert_hash_prefixes_internal (EphyGSBStorage    *self,
+                                                EphyGSBThreatList *list,
+                                                const guint8      *prefixes,
+                                                gsize              num_prefixes,
+                                                gsize              prefix_len)
 {
   EphySQLiteStatement *statement = NULL;
-  guint8 *prefixes;
-  gsize prefixes_len;
-  gsize num_prefixes;
   gsize num_batches;
 
   g_assert (EPHY_IS_GSB_STORAGE (self));
   g_assert (self->is_operable);
   g_assert (list);
-  g_assert (prefix_len > 0);
-  g_assert (prefixes_b64);
-
-  prefixes = g_base64_decode (prefixes_b64, &prefixes_len);
-  num_prefixes = prefixes_len / prefix_len;
-  num_batches = num_prefixes / BATCH_SIZE;
+  g_assert (prefixes);
 
   LOG ("Inserting %lu hash prefixes of size %ld...", num_prefixes, prefix_len);
 
   ephy_gsb_storage_start_transaction (self);
 
+  num_batches = num_prefixes / BATCH_SIZE;
   if (num_batches > 0) {
     /* Reuse statement to increase performance. */
     statement = ephy_gsb_storage_make_insert_hash_prefix_statement (self, BATCH_SIZE);
 
     for (gsize i = 0; i < num_batches; i++) {
-      ephy_gsb_storage_insert_hash_prefix_batch (self, list, prefixes,
-                                                 i * prefix_len * BATCH_SIZE,
-                                                 (i + 1) * prefix_len * BATCH_SIZE,
-                                                 prefix_len,
-                                                 statement);
+      ephy_gsb_storage_insert_hash_prefixes_batch (self, list, prefixes,
+                                                   i * prefix_len * BATCH_SIZE,
+                                                   (i + 1) * prefix_len * BATCH_SIZE,
+                                                   prefix_len,
+                                                   statement);
     }
   }
 
   if (num_prefixes % BATCH_SIZE != 0) {
-    ephy_gsb_storage_insert_hash_prefix_batch (self, list, prefixes,
-                                               num_batches * prefix_len * BATCH_SIZE,
-                                               prefixes_len - 1,
-                                               prefix_len,
-                                               NULL);
+    ephy_gsb_storage_insert_hash_prefixes_batch (self, list, prefixes,
+                                                 num_batches * prefix_len * BATCH_SIZE,
+                                                 num_prefixes * prefix_len - 1,
+                                                 prefix_len,
+                                                 NULL);
   }
 
   ephy_gsb_storage_end_transaction (self);
 
-  g_free (prefixes);
   if (statement)
     g_object_unref (statement);
 }
 
+void
+ephy_gsb_storage_insert_hash_prefixes (EphyGSBStorage    *self,
+                                       EphyGSBThreatList *list,
+                                       JsonObject        *tes)
+{
+  JsonObject *raw_hashes;
+  JsonObject *rice_hashes;
+  const char *compression;
+  const char *prefixes_b64;
+  guint32 *items = NULL;
+  guint8 *prefixes;
+  gsize prefixes_len;
+  gsize prefix_len;
+  gsize num_prefixes;
+
+  g_assert (EPHY_IS_GSB_STORAGE (self));
+  g_assert (self->is_operable);
+  g_assert (list);
+  g_assert (tes);
+
+  compression = json_object_get_string_member (tes, "compressionType");
+  if (!g_strcmp0 (compression, GSB_COMPRESSION_TYPE_RICE)) {
+    rice_hashes = json_object_get_object_member (tes, "riceHashes");
+    items = ephy_gsb_utils_rice_delta_decode (rice_hashes, &num_prefixes);
+
+    prefixes = g_malloc (num_prefixes * GSB_RICE_PREFIX_LEN);
+    for (gsize i = 0; i < num_prefixes; i++)
+      memcpy (prefixes + i * GSB_RICE_PREFIX_LEN, &items[i], GSB_RICE_PREFIX_LEN);
+
+    prefix_len = GSB_RICE_PREFIX_LEN;
+  } else {
+    raw_hashes = json_object_get_object_member (tes, "rawHashes");
+    prefix_len = json_object_get_int_member (raw_hashes, "prefixSize");
+    prefixes_b64 = json_object_get_string_member (raw_hashes, "rawHashes");
+
+    prefixes = g_base64_decode (prefixes_b64, &prefixes_len);
+    num_prefixes = prefixes_len / prefix_len;
+  }
+
+  ephy_gsb_storage_insert_hash_prefixes_internal (self, list, prefixes, num_prefixes, prefix_len);
+
+  g_free (items);
+  g_free (prefixes);
+}
+
 GList *
 ephy_gsb_storage_lookup_hash_prefixes (EphyGSBStorage *self,
                                        GList          *cues)
@@ -1172,7 +1247,7 @@ ephy_gsb_storage_lookup_hash_prefixes (EphyGSBStorage *self,
 
   for (GList *l = cues; l && l->data; l = l->next) {
     ephy_sqlite_statement_bind_blob (statement, id++,
-                                     g_bytes_get_data (l->data, NULL), GSB_CUE_LEN,
+                                     g_bytes_get_data (l->data, NULL), GSB_HASH_CUE_LEN,
                                      &error);
     if (error) {
       g_warning ("Failed to bind cue value as blob: %s", error->message);
diff --git a/lib/safe-browsing/ephy-gsb-storage.h b/lib/safe-browsing/ephy-gsb-storage.h
index 01ef05e..aa3754d 100644
--- a/lib/safe-browsing/ephy-gsb-storage.h
+++ b/lib/safe-browsing/ephy-gsb-storage.h
@@ -45,11 +45,10 @@ void            ephy_gsb_storage_clear_hash_prefixes            (EphyGSBStorage
                                                                  EphyGSBThreatList *list);
 void            ephy_gsb_storage_delete_hash_prefixes           (EphyGSBStorage    *self,
                                                                  EphyGSBThreatList *list,
-                                                                 JsonArray         *indices);
+                                                                 JsonObject        *tes);
 void            ephy_gsb_storage_insert_hash_prefixes           (EphyGSBStorage    *self,
                                                                  EphyGSBThreatList *list,
-                                                                 gsize              prefix_len,
-                                                                 const char        *prefixes_b64);
+                                                                 JsonObject        *tes);
 GList          *ephy_gsb_storage_lookup_hash_prefixes           (EphyGSBStorage *self,
                                                                  GList          *cues);
 GList          *ephy_gsb_storage_lookup_full_hashes             (EphyGSBStorage *self,
diff --git a/lib/safe-browsing/ephy-gsb-utils.c b/lib/safe-browsing/ephy-gsb-utils.c
index 5b72182..e178b44 100644
--- a/lib/safe-browsing/ephy-gsb-utils.c
+++ b/lib/safe-browsing/ephy-gsb-utils.c
@@ -26,12 +26,129 @@
 
 #include <arpa/inet.h>
 #include <libsoup/soup.h>
+#include <stdio.h>
 #include <string.h>
 
 #define MAX_HOST_SUFFIXES 5
 #define MAX_PATH_PREFIXES 6
 #define MAX_UNESCAPE_STEP 1024
 
+typedef struct {
+  guint8 *data;     /* The bit stream as an array of bytes */
+  gsize   data_len; /* The number of bytes in the array */
+  guint8 *curr;     /* The current byte in the bit stream */
+  guint8  mask;     /* Bit mask to read a bit within a byte */
+  gsize   read;     /* The number of bits read so far */
+} EphyGSBBitReader;
+
+typedef struct {
+  EphyGSBBitReader *reader;
+  guint             parameter; /* Golomb-Rice parameter */
+} EphyGSBRiceDecoder;
+
+static inline EphyGSBBitReader *
+ephy_gsb_bit_reader_new (const guint8 *data,
+                         gsize         data_len)
+{
+  EphyGSBBitReader *reader;
+
+  g_assert (data);
+  g_assert (data_len > 0);
+
+  reader = g_slice_new (EphyGSBBitReader);
+  reader->curr = reader->data = g_malloc (data_len);
+  memcpy (reader->data, data, data_len);
+  reader->data_len = data_len;
+  reader->read = 0;
+  reader->mask = 0x01;
+
+  return reader;
+}
+
+static inline void
+ephy_gsb_bit_reader_free (EphyGSBBitReader *reader)
+{
+  g_assert (reader);
+
+  g_free (reader->data);
+  g_slice_free (EphyGSBBitReader, reader);
+}
+
+/*
+ * https://developers.google.com/safe-browsing/v4/compression#bit-encoderdecoder
+ */
+static guint32
+ephy_gsb_bit_reader_read (EphyGSBBitReader *reader,
+                          guint             num_bits)
+{
+  guint32 retval = 0;
+
+  /* Cannot read more than 4 bytes at once. */
+  g_assert (num_bits <= 32);
+  /* Cannot read more bits than the buffer has left. */
+  g_assert (reader->read + num_bits <= reader->data_len * 8);
+
+  /* Within a byte, the least-significant bits come before the most-significant
+   * bits in the bit stream. */
+  for (guint i = 0; i < num_bits; i++) {
+    if (*reader->curr & reader->mask)
+      retval |= 1 << i;
+
+    reader->mask <<= 1;
+    if (reader->mask == 0) {
+      reader->curr++;
+      reader->mask = 0x01;
+    }
+  }
+
+  reader->read += num_bits;
+
+  return retval;
+}
+
+static inline EphyGSBRiceDecoder *
+ephy_gsb_rice_decoder_new (const guint8 *data,
+                           gsize         data_len,
+                           guint32       parameter)
+{
+  EphyGSBRiceDecoder *decoder;
+
+  g_assert (data);
+  g_assert (data_len > 0);
+
+  decoder = g_slice_new (EphyGSBRiceDecoder);
+  decoder->reader = ephy_gsb_bit_reader_new (data, data_len);
+  decoder->parameter = parameter;
+
+  return decoder;
+}
+
+static inline void
+ephy_gsb_rice_decoder_free (EphyGSBRiceDecoder *decoder)
+{
+  g_assert (decoder);
+
+  ephy_gsb_bit_reader_free (decoder->reader);
+  g_slice_free (EphyGSBRiceDecoder, decoder);
+}
+
+static guint32
+ephy_gsb_rice_decoder_next (EphyGSBRiceDecoder *decoder)
+{
+  guint32 quotient = 0;
+  guint32 remainder;
+  guint32 bit;
+
+  g_assert (decoder);
+
+  while ((bit = ephy_gsb_bit_reader_read (decoder->reader, 1)) != 0)
+    quotient += bit;
+
+  remainder = ephy_gsb_bit_reader_read (decoder->reader, decoder->parameter);
+
+  return (quotient << decoder->parameter) + remainder;
+}
+
 EphyGSBThreatList *
 ephy_gsb_threat_list_new (const char *threat_type,
                           const char *platform_type,
@@ -175,7 +292,8 @@ ephy_gsb_utils_make_contraints (void)
   JsonArray *compressions;
 
   compressions = json_array_new ();
-  json_array_add_string_element (compressions, "RAW");
+  json_array_add_string_element (compressions, GSB_COMPRESSION_TYPE_RAW);
+  json_array_add_string_element (compressions, GSB_COMPRESSION_TYPE_RICE);
 
   constraints = json_object_new ();
   /* No restriction for the number of update entries. */
@@ -336,6 +454,46 @@ ephy_gsb_utils_get_metadata_entry (JsonObject *threat_entry_metadata,
   return NULL;
 }
 
+/*
+ * https://developers.google.com/safe-browsing/v4/compression#rice-compression
+ */
+guint32 *
+ephy_gsb_utils_rice_delta_decode (JsonObject *rde,
+                                  gsize      *num_items)
+{
+  EphyGSBRiceDecoder *decoder;
+  const char *data_b64;
+  const char *first_value_str;
+  guint8 *data;
+  guint32 *items;
+  gsize data_len;
+  guint parameter;
+  guint num_entries;
+
+  g_assert (rde);
+  g_assert (num_items);
+
+  first_value_str = json_object_get_string_member (rde, "firstValue");
+  parameter = json_object_get_int_member (rde, "riceParameter");
+  num_entries = json_object_get_int_member (rde, "numEntries");
+  data_b64 = json_object_get_string_member (rde, "encodedData");
+
+  *num_items = 1 + num_entries;
+  items = g_malloc (*num_items * sizeof (guint32));
+  sscanf (first_value_str, "%u", &items[0]);
+
+  data = g_base64_decode (data_b64, &data_len);
+  decoder = ephy_gsb_rice_decoder_new (data, data_len, parameter);
+
+  for (guint i = 1; i <= num_entries; i++)
+    items[i] = items[i - 1] + ephy_gsb_rice_decoder_next (decoder);
+
+  g_free (data);
+  ephy_gsb_rice_decoder_free (decoder);
+
+  return items;
+}
+
 static char *
 ephy_gsb_utils_full_unescape (const char *part)
 {
@@ -663,7 +821,7 @@ ephy_gsb_utils_get_hash_cues (GList *hashes)
 
   for (GList *l = hashes; l && l->data; l = l->next) {
     const char *hash = g_bytes_get_data (l->data, NULL);
-    retval = g_list_prepend (retval, g_bytes_new (hash, GSB_CUE_LEN));
+    retval = g_list_prepend (retval, g_bytes_new (hash, GSB_HASH_CUE_LEN));
   }
 
   return g_list_reverse (retval);
diff --git a/lib/safe-browsing/ephy-gsb-utils.h b/lib/safe-browsing/ephy-gsb-utils.h
index 84f2518..3002cc0 100644
--- a/lib/safe-browsing/ephy-gsb-utils.h
+++ b/lib/safe-browsing/ephy-gsb-utils.h
@@ -25,10 +25,16 @@
 
 G_BEGIN_DECLS
 
-#define GSB_CUE_LEN   4
+#define GSB_HASH_CUE_LEN    4
+#define GSB_RICE_PREFIX_LEN 4
+
 #define GSB_HASH_TYPE G_CHECKSUM_SHA256
 #define GSB_HASH_SIZE (g_checksum_type_get_length (GSB_HASH_TYPE))
 
+#define GSB_COMPRESSION_TYPE_RAW         "RAW"
+#define GSB_COMPRESSION_TYPE_RICE        "RICE"
+#define GSB_COMPRESSION_TYPE_UNSPECIFIED "COMPRESSION_TYPE_UNSPECIFIED"
+
 #define GSB_THREAT_TYPE_MALWARE            "MALWARE"
 #define GSB_THREAT_TYPE_SOCIAL_ENGINEERING "SOCIAL_ENGINEERING"
 #define GSB_THREAT_TYPE_UNWANTED_SOFTWARE  "UNWANTED_SOFTWARE"
@@ -86,6 +92,8 @@ JsonObject              *ephy_gsb_utils_make_full_hashes_request  (GList *threat
                                                                    GList *hash_prefixes);
 char                    *ephy_gsb_utils_get_metadata_entry        (JsonObject *threat_entry_metadata,
                                                                    const char *metadata_key);
+guint32                 *ephy_gsb_utils_rice_delta_decode         (JsonObject *rde,
+                                                                   gsize      *num_items);
 
 char                    *ephy_gsb_utils_canonicalize              (const char  *url,
                                                                    char       **host_out,


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