Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz-ng/src/hb-blob.cc

+/*
+ * Copyright © 2009  Red Hat, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ */
+
+#include "hb-private.hh"
+
+#include "hb-blob.h"
+#include "hb-object-private.hh"
+
+#ifdef HAVE_SYS_MMAN_H
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+#include <sys/mman.h>
+#endif /* HAVE_SYS_MMAN_H */
+
+#include <stdio.h>
+#include <errno.h>
+
+
+
+#ifndef HB_DEBUG_BLOB
+#define HB_DEBUG_BLOB (HB_DEBUG+0)
+#endif
+
+
+struct _hb_blob_t {
+  hb_object_header_t header;
+
+  bool immutable;
+
+  const char *data;
+  unsigned int length;
+  hb_memory_mode_t mode;
+
+  void *user_data;
+  hb_destroy_func_t destroy;
+};
+
+static hb_blob_t _hb_blob_nil = {
+  HB_OBJECT_HEADER_STATIC,
+
+  TRUE, /* immutable */
+
+  NULL, /* data */
+  0, /* length */
+  HB_MEMORY_MODE_READONLY, /* mode */
+
+  NULL, /* user_data */
+  NULL  /* destroy */
+};
+
+
+static bool _try_writable (hb_blob_t *blob);
+
+static void
+_hb_blob_destroy_user_data (hb_blob_t *blob)
+{
+  if (blob->destroy) {
+    blob->destroy (blob->user_data);
+    blob->user_data = NULL;
+    blob->destroy = NULL;
+  }
+}
+
+hb_blob_t *
+hb_blob_create (const char        *data,
+                unsigned int       length,
+                hb_memory_mode_t   mode,
+                void              *user_data,
+                hb_destroy_func_t  destroy)
+{
+  hb_blob_t *blob;
+
+  if (!length || !(blob = hb_object_create<hb_blob_t> ())) {
+    if (destroy)
+      destroy (user_data);
+    return &_hb_blob_nil;
+  }
+
+  blob->data = data;
+  blob->length = length;
+  blob->mode = mode;
+
+  blob->user_data = user_data;
+  blob->destroy = destroy;
+
+  if (blob->mode == HB_MEMORY_MODE_DUPLICATE) {
+    blob->mode = HB_MEMORY_MODE_READONLY;
+    if (!_try_writable (blob)) {
+      hb_blob_destroy (blob);
+      return &_hb_blob_nil;
+    }
+  }
+
+  return blob;
+}
+
+hb_blob_t *
+hb_blob_create_sub_blob (hb_blob_t    *parent,
+                         unsigned int  offset,
+                         unsigned int  length)
+{
+  hb_blob_t *blob;
+
+  if (!length || offset >= parent->length)
+    return &_hb_blob_nil;
+
+  hb_blob_make_immutable (parent);
+
+  blob = hb_blob_create (parent->data + offset,
+                         MIN (length, parent->length - offset),
+                         parent->mode,
+                         hb_blob_reference (parent),
+                         (hb_destroy_func_t) hb_blob_destroy);
+
+  return blob;
+}
+
+hb_blob_t *
+hb_blob_get_empty (void)
+{
+  return &_hb_blob_nil;
+}
+
+hb_blob_t *
+hb_blob_reference (hb_blob_t *blob)
+{
+  return hb_object_reference (blob);
+}
+
+void
+hb_blob_destroy (hb_blob_t *blob)
+{
+  if (!hb_object_destroy (blob)) return;
+
+  _hb_blob_destroy_user_data (blob);
+
+  free (blob);
+}
+
+hb_bool_t
+hb_blob_set_user_data (hb_blob_t          *blob,
+                       hb_user_data_key_t *key,
+                       void *              data,
+                       hb_destroy_func_t   destroy,
+                       hb_bool_t           replace)
+{
+  return hb_object_set_user_data (blob, key, data, destroy, replace);
+}
+
+void *
+hb_blob_get_user_data (hb_blob_t          *blob,
+                       hb_user_data_key_t *key)
+{
+  return hb_object_get_user_data (blob, key);
+}
+
+
+void
+hb_blob_make_immutable (hb_blob_t *blob)
+{
+  if (hb_object_is_inert (blob))
+    return;
+
+  blob->immutable = TRUE;
+}
+
+hb_bool_t
+hb_blob_is_immutable (hb_blob_t *blob)
+{
+  return blob->immutable;
+}
+
+
+unsigned int
+hb_blob_get_length (hb_blob_t *blob)
+{
+  return blob->length;
+}
+
+const char *
+hb_blob_get_data (hb_blob_t *blob, unsigned int *length)
+{
+  if (length)
+    *length = blob->length;
+
+  return blob->data;
+}
+
+char *
+hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length)
+{
+  if (!_try_writable (blob)) {
+    if (length)
+      *length = 0;
+
+    return NULL;
+  }
+
+  if (length)
+    *length = blob->length;
+
+  return const_cast<char *> (blob->data);
+}
+
+
+static hb_bool_t
+_try_make_writable_inplace_unix (hb_blob_t *blob)
+{
+#if defined(HAVE_SYS_MMAN_H) && defined(HAVE_MPROTECT)
+  uintptr_t pagesize = -1, mask, length;
+  const char *addr;
+
+#if defined(HAVE_SYSCONF) && defined(_SC_PAGE_SIZE)
+  pagesize = (uintptr_t) sysconf (_SC_PAGE_SIZE);
+#elif defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
+  pagesize = (uintptr_t) sysconf (_SC_PAGESIZE);
+#elif defined(HAVE_GETPAGESIZE)
+  pagesize = (uintptr_t) getpagesize ();
+#endif
+
+  if ((uintptr_t) -1L == pagesize) {
+    DEBUG_MSG_FUNC (BLOB, blob, "failed to get pagesize: %s", strerror (errno));
+    return FALSE;
+  }
+  DEBUG_MSG_FUNC (BLOB, blob, "pagesize is %lu", (unsigned long) pagesize);
+
+  mask = ~(pagesize-1);
+  addr = (const char *) (((uintptr_t) blob->data) & mask);
+  length = (const char *) (((uintptr_t) blob->data + blob->length + pagesize-1) & mask)  - addr;
+  DEBUG_MSG_FUNC (BLOB, blob,
+                  "calling mprotect on [%p..%p] (%lu bytes)",
+                  addr, addr+length, (unsigned long) length);
+  if (-1 == mprotect ((void *) addr, length, PROT_READ | PROT_WRITE)) {
+    DEBUG_MSG_FUNC (BLOB, blob, "mprotect failed: %s", strerror (errno));
+    return FALSE;
+  }
+
+  blob->mode = HB_MEMORY_MODE_WRITABLE;
+
+  DEBUG_MSG_FUNC (BLOB, blob,
+                  "successfully made [%p..%p] (%lu bytes) writable\n",
+                  addr, addr+length, (unsigned long) length);
+  return TRUE;
+#else
+  return FALSE;
+#endif
+}
+
+static bool
+_try_writable_inplace (hb_blob_t *blob)
+{
+  DEBUG_MSG_FUNC (BLOB, blob, "making writable inplace\n");
+
+  if (_try_make_writable_inplace_unix (blob))
+    return TRUE;
+
+  DEBUG_MSG_FUNC (BLOB, blob, "making writable -> FAILED\n");
+
+  /* Failed to make writable inplace, mark that */
+  blob->mode = HB_MEMORY_MODE_READONLY;
+  return FALSE;
+}
+
+static bool
+_try_writable (hb_blob_t *blob)
+{
+  if (blob->immutable)
+    return FALSE;
+
+  if (blob->mode == HB_MEMORY_MODE_WRITABLE)
+    return TRUE;
+
+  if (blob->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE && _try_writable_inplace (blob))
+    return TRUE;
+
+  if (blob->mode == HB_MEMORY_MODE_WRITABLE)
+    return TRUE;
+
+
+  DEBUG_MSG_FUNC (BLOB, blob, "currect data is -> %p\n", blob->data);
+
+  char *new_data;
+
+  new_data = (char *) malloc (blob->length);
+  if (unlikely (!new_data))
+    return FALSE;
+
+  DEBUG_MSG_FUNC (BLOB, blob, "dupped successfully -> %p\n", blob->data);
+
+  memcpy (new_data, blob->data, blob->length);
+  _hb_blob_destroy_user_data (blob);
+  blob->mode = HB_MEMORY_MODE_WRITABLE;
+  blob->data = new_data;
+  blob->user_data = new_data;
+  blob->destroy = free;
+
+  return TRUE;
+}
+
+