// 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