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+/*
+ * 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
+ */
+
+#ifndef HB_H_IN
+#error "Include <hb.h> instead."
+#endif
+
+#ifndef HB_BLOB_H
+#define HB_BLOB_H
+
+#include "hb-common.h"
+
+HB_BEGIN_DECLS
+
+
+/*
+ * Note re various memory-modes:
+ *
+ * - In no case shall the HarfBuzz client modify memory
+ * that is passed to HarfBuzz in a blob. If there is
+ * any such possibility, MODE_DUPLICATE should be used
+ * such that HarfBuzz makes a copy immediately,
+ *
+ * - Use MODE_READONLY otherse, unless you really really
+ * really know what you are doing,
+ *
+ * - MODE_WRITABLE is appropriate if you really made a
+ * copy of data solely for the purpose of passing to
+ * HarfBuzz and doing that just once (no reuse!),
+ *
+ * - If the font is mmap()ed, it's ok to use
+ * READONLY_MAY_MAKE_WRITABLE, however, using that mode
+ * correctly is very tricky. Use MODE_READONLY instead.
+ */
+typedef enum {
+ HB_MEMORY_MODE_DUPLICATE,
+ HB_MEMORY_MODE_READONLY,
+ HB_MEMORY_MODE_WRITABLE,
+ HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE
+} hb_memory_mode_t;
+
+typedef struct hb_blob_t hb_blob_t;
+
+HB_EXTERN 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);
+
+/* Always creates with MEMORY_MODE_READONLY.
+ * Even if the parent blob is writable, we don't
+ * want the user of the sub-blob to be able to
+ * modify the parent data as that data may be
+ * shared among multiple sub-blobs.
+ */
+HB_EXTERN hb_blob_t *
+hb_blob_create_sub_blob (hb_blob_t *parent,
+ unsigned int offset,
+ unsigned int length);
+
+HB_EXTERN hb_blob_t *
+hb_blob_get_empty (void);
+
+HB_EXTERN hb_blob_t *
+hb_blob_reference (hb_blob_t *blob);
+
+HB_EXTERN void
+hb_blob_destroy (hb_blob_t *blob);
+
+HB_EXTERN 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);
+
+
+HB_EXTERN void *
+hb_blob_get_user_data (hb_blob_t *blob,
+ hb_user_data_key_t *key);
+
+
+HB_EXTERN void
+hb_blob_make_immutable (hb_blob_t *blob);
+
+HB_EXTERN hb_bool_t
+hb_blob_is_immutable (hb_blob_t *blob);
+
+
+HB_EXTERN unsigned int
+hb_blob_get_length (hb_blob_t *blob);
+
+HB_EXTERN const char *
+hb_blob_get_data (hb_blob_t *blob, unsigned int *length);
+
+HB_EXTERN char *
+hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length);
+
+
+HB_END_DECLS
+
+#endif /* HB_BLOB_H */