[HB] Add a "blob" manager
This commit is contained in:
Behdad Esfahbod
parent
02a370697d
commit
f0954d1e08
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@ -11,6 +11,7 @@ CXX = gcc -g -O2 -fno-rtti -fno-exceptions -Wabi -Wpadded -Wcast-align
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noinst_LTLIBRARIES = libharfbuzz-1.la
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HBSOURCES = \
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hb-blob.c \
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hb-buffer.c \
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hb-buffer-private.h \
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hb-private.h \
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@ -22,11 +23,13 @@ HBSOURCES = \
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hb-ot-layout-gsub-private.h \
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hb-ot-layout-open-private.h \
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hb-ot-layout-private.h \
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hb-refcount-private.h \
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$(NULL)
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HBHEADERS = \
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hb-common.h \
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hb-blob.h \
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hb-buffer.h \
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hb-common.h \
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hb-ot-layout.h \
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$(NULL)
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@ -0,0 +1,181 @@
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/*
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* Copyright (C) 2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, an OpenType Layout engine library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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*/
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#include "hb-private.h"
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#include "hb-blob.h"
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#include "hb-refcount-private.h"
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struct _hb_blob_t {
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const char *data;
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unsigned int len;
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hb_memory_mode_t mode;
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hb_reference_count_t ref_count;
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hb_destroy_func_t destroy;
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void *user_data;
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};
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static hb_blob_t _hb_blob_nil = {
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NULL,
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0,
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HB_MEMORY_MODE_READONLY,
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HB_REFERENCE_COUNT_INVALID,
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NULL,
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NULL
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};
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static void
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_hb_blob_destroy_user_data (hb_blob_t *blob)
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{
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if (blob->destroy) {
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blob->destroy (blob->user_data);
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blob->destroy = NULL;
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blob->user_data = NULL;
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}
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}
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hb_blob_t *
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hb_blob_create (const char *data,
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unsigned int len,
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hb_memory_mode_t mode,
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hb_destroy_func_t destroy,
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void *user_data)
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{
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hb_blob_t *blob;
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blob = malloc (sizeof (hb_blob_t));
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if (!blob) {
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if (destroy)
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destroy (user_data);
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return &_hb_blob_nil;
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}
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blob->data = data;
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blob->len = len;
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blob->mode = mode;
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HB_REFERENCE_COUNT_INIT (blob->ref_count, 1);
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blob->destroy = destroy;
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blob->user_data = user_data;
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if (blob->mode == HB_MEMORY_MODE_DUPLICATE) {
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blob->mode = HB_MEMORY_MODE_READONLY;
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hb_blob_make_writeable (blob);
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}
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return blob;
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}
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hb_blob_t *
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hb_blob_reference (hb_blob_t *blob)
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{
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if (blob == NULL || HB_REFERENCE_COUNT_IS_INVALID (blob->ref_count))
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return blob;
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assert (HB_REFERENCE_COUNT_HAS_REFERENCE (blob->ref_count));
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_hb_reference_count_inc (blob->ref_count);
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return blob;
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}
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void
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hb_blob_destroy (hb_blob_t *blob)
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{
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if (blob == NULL || HB_REFERENCE_COUNT_IS_INVALID (blob->ref_count))
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return;
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assert (HB_REFERENCE_COUNT_HAS_REFERENCE (blob->ref_count));
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if (!_hb_reference_count_dec_and_test (blob->ref_count))
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return;
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_hb_blob_destroy_user_data (blob);
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free (blob);
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}
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const char *
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hb_blob_get_data (hb_blob_t *blob,
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unsigned int *len)
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{
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if (len)
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*len = blob->len;
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return blob->data;
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}
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hb_bool_t
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hb_blob_is_writeable (hb_blob_t *blob)
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{
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return blob->mode == HB_MEMORY_MODE_WRITEABLE;
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}
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hb_bool_t
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hb_blob_try_writeable_inplace (hb_blob_t *blob)
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{
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if (blob->mode == HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITEABLE) {
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/* XXX
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* mprotect
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blob->mode == HB_MEMORY_MODE_WRITEABLE;
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*/
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}
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return blob->mode == HB_MEMORY_MODE_WRITEABLE;
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}
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/* DANGER: May rebase or nullify */
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void
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hb_blob_make_writeable (hb_blob_t *blob)
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{
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if (blob->mode == HB_MEMORY_MODE_READONLY_NEVER_DUPLICATE)
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{
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_hb_blob_destroy_user_data (blob);
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blob->data = NULL;
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blob->len = 0;
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}
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else if (blob->mode == HB_MEMORY_MODE_READONLY)
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{
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char *new_data;
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new_data = malloc (blob->len);
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if (new_data)
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memcpy (new_data, blob->data, blob->len);
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_hb_blob_destroy_user_data (blob);
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if (!new_data) {
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blob->data = NULL;
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blob->len = 0;
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} else
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blob->data = new_data;
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blob->mode = HB_MEMORY_MODE_WRITEABLE;
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}
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else
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hb_blob_try_writeable_inplace (blob);
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}
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@ -0,0 +1,74 @@
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/*
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* Copyright (C) 2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, an OpenType Layout engine library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
|
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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*/
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#ifndef HB_BLOB_H
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#define HB_BLOB_H
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#include "hb-common.h"
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HB_BEGIN_DECLS
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typedef struct _hb_blob_t hb_blob_t;
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typedef void (*hb_destroy_func_t) (void *user_data);
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typedef enum {
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HB_MEMORY_MODE_DUPLICATE,
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HB_MEMORY_MODE_READONLY,
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HB_MEMORY_MODE_WRITEABLE,
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HB_MEMORY_MODE_READONLY_NEVER_DUPLICATE,
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HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITEABLE,
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} hb_memory_mode_t;
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hb_blob_t *
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hb_blob_create (const char *data,
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unsigned int len,
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hb_memory_mode_t mode,
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hb_destroy_func_t destroy,
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void *user_data);
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hb_blob_t *
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hb_blob_reference (hb_blob_t *blob);
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void
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hb_blob_destroy (hb_blob_t *blob);
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const char *
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hb_blob_get_data (hb_blob_t *blob,
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unsigned int *len);
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hb_bool_t
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hb_blob_is_writeable (hb_blob_t *blob);
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hb_bool_t
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hb_blob_try_writeable_inplace (hb_blob_t *blob);
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/* DANGER: May rebase or nullify */
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void
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hb_blob_make_writeable (hb_blob_t *blob);
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HB_END_DECLS
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#endif /* HB_BLOB_H */
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@ -49,6 +49,8 @@
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#include <stdlib.h>
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#include <stdio.h> /* XXX */
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#include <string.h>
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#include <assert.h>
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/* Basics */
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@ -0,0 +1,54 @@
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/*
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* Copyright © 2007 Chris Wilson
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*
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* This is part of HarfBuzz, an OpenType Layout engine library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Contributor(s):
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* Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#ifndef HB_REFCOUNT_PRIVATE_H
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#define HB_REFCOUNT_PRIVATE_H
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typedef int hb_atomic_int_t;
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/* Encapsulate operations on the object's reference count */
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typedef struct {
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hb_atomic_int_t ref_count;
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} hb_reference_count_t;
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/* XXX add real atomic ops */
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#define _hb_reference_count_inc(RC) ((RC).ref_count++)
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#define _hb_reference_count_dec_and_test(RC) ((RC).ref_count-- == 1)
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#define HB_REFERENCE_COUNT_INIT(RC, VALUE) ((RC).ref_count = (VALUE))
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#define HB_REFERENCE_COUNT_GET_VALUE(RC) ((RC).ref_count+0)
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#define HB_REFERENCE_COUNT_SET_VALUE(RC, VALUE) ((RC).ref_count = (VALUE), 0)
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#define HB_REFERENCE_COUNT_INVALID_VALUE ((hb_atomic_int_t) -1)
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#define HB_REFERENCE_COUNT_INVALID {HB_REFERENCE_COUNT_INVALID_VALUE}
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#define HB_REFERENCE_COUNT_IS_INVALID(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) == HB_REFERENCE_COUNT_INVALID_VALUE)
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#define HB_REFERENCE_COUNT_HAS_REFERENCE(RC) (HB_REFERENCE_COUNT_GET_VALUE (RC) > 0)
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#endif /* HB_REFCOUNT_PRIVATE_H */
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