Initial commit

engine/thirdparty/graphite/src/FileFace.cpp

@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: MIT OR MPL-2.0 OR LGPL-2.1-or-later OR GPL-2.0-or-later
+// Copyright 2012, SIL International, All rights reserved.
+
+#include <cstring>
+#include "inc/FileFace.h"
+
+
+#ifndef GRAPHITE2_NFILEFACE
+
+using namespace graphite2;
+
+FileFace::FileFace(const char *filename)
+: _file(fopen(filename, "rb")),
+  _file_len(0),
+  _header_tbl(NULL),
+  _table_dir(NULL)
+{
+    if (!_file) return;
+
+    if (fseek(_file, 0, SEEK_END)) return;
+    _file_len = ftell(_file);
+    if (fseek(_file, 0, SEEK_SET)) return;
+
+    size_t tbl_offset, tbl_len;
+
+    // Get the header.
+    if (!TtfUtil::GetHeaderInfo(tbl_offset, tbl_len)) return;
+    if (fseek(_file, long(tbl_offset), SEEK_SET)) return;
+    _header_tbl = (TtfUtil::Sfnt::OffsetSubTable*)gralloc<char>(tbl_len);
+    if (_header_tbl)
+    {
+        if (fread(_header_tbl, 1, tbl_len, _file) != tbl_len) return;
+        if (!TtfUtil::CheckHeader(_header_tbl)) return;
+    }
+
+    // Get the table directory
+    if (!TtfUtil::GetTableDirInfo(_header_tbl, tbl_offset, tbl_len)) return;
+    _table_dir = (TtfUtil::Sfnt::OffsetSubTable::Entry*)gralloc<char>(tbl_len);
+    if (fseek(_file, long(tbl_offset), SEEK_SET)) return;
+    if (_table_dir && fread(_table_dir, 1, tbl_len, _file) != tbl_len)
+    {
+        free(_table_dir);
+        _table_dir = NULL;
+    }
+    return;
+}
+
+FileFace::~FileFace()
+{
+    free(_table_dir);
+    free(_header_tbl);
+    if (_file)
+        fclose(_file);
+}
+
+
+const void *FileFace::get_table_fn(const void* appFaceHandle, unsigned int name, size_t *len)
+{
+    if (appFaceHandle == 0)     return 0;
+    const FileFace & file_face = *static_cast<const FileFace *>(appFaceHandle);
+
+    void *tbl;
+    size_t tbl_offset, tbl_len;
+    if (!TtfUtil::GetTableInfo(name, file_face._header_tbl, file_face._table_dir, tbl_offset, tbl_len))
+        return 0;
+
+    if (tbl_offset > file_face._file_len || tbl_len > file_face._file_len - tbl_offset
+            || fseek(file_face._file, long(tbl_offset), SEEK_SET) != 0)
+        return 0;
+
+    tbl = malloc(tbl_len);
+    if (!tbl || fread(tbl, 1, tbl_len, file_face._file) != tbl_len)
+    {
+        free(tbl);
+        return 0;
+    }
+
+    if (len) *len = tbl_len;
+    return tbl;
+}
+
+void FileFace::rel_table_fn(const void* appFaceHandle, const void *table_buffer)
+{
+    if (appFaceHandle == 0)     return;
+
+    free(const_cast<void *>(table_buffer));
+}
+
+const gr_face_ops FileFace::ops = { sizeof FileFace::ops, &FileFace::get_table_fn, &FileFace::rel_table_fn };
+
+
+#endif                  //!GRAPHITE2_NFILEFACE