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// 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
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