From 041d1ea37802bf7178a31a53f96c26efa6b8fb7b Mon Sep 17 00:00:00 2001 From: James Date: Fri, 16 Nov 2012 10:41:01 +0000 Subject: fish --- include/grub/file.h | 129 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 129 insertions(+) create mode 100644 include/grub/file.h (limited to 'include/grub/file.h') diff --git a/include/grub/file.h b/include/grub/file.h new file mode 100644 index 0000000..3adb170 --- /dev/null +++ b/include/grub/file.h @@ -0,0 +1,129 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2007 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see . + */ + +#ifndef GRUB_FILE_HEADER +#define GRUB_FILE_HEADER 1 + +#include +#include +#include +#include + +/* File description. */ +struct grub_file +{ + /* The underlying device. */ + grub_device_t device; + + /* The underlying filesystem. */ + grub_fs_t fs; + + /* The current offset. */ + grub_off_t offset; + + /* The file size. */ + grub_off_t size; + + /* If file is not easily seekable. Should be set by underlying layer. */ + int not_easily_seekable; + + /* Filesystem-specific data. */ + void *data; + + /* This is called when a sector is read. Used only for a disk device. */ + void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector, + unsigned offset, unsigned length); +}; +typedef struct grub_file *grub_file_t; + +/* Filters with lower ID are executed first. */ +typedef enum grub_file_filter_id + { + GRUB_FILE_FILTER_GZIO, + GRUB_FILE_FILTER_XZIO, + GRUB_FILE_FILTER_MAX, + GRUB_FILE_FILTER_COMPRESSION_FIRST = GRUB_FILE_FILTER_GZIO, + GRUB_FILE_FILTER_COMPRESSION_LAST = GRUB_FILE_FILTER_XZIO, + } grub_file_filter_id_t; + +typedef grub_file_t (*grub_file_filter_t) (grub_file_t in); + +extern grub_file_filter_t EXPORT_VAR(grub_file_filters_all)[GRUB_FILE_FILTER_MAX]; +extern grub_file_filter_t EXPORT_VAR(grub_file_filters_enabled)[GRUB_FILE_FILTER_MAX]; + +static inline void +grub_file_filter_register (grub_file_filter_id_t id, grub_file_filter_t filter) +{ + grub_file_filters_all[id] = filter; + grub_file_filters_enabled[id] = filter; +}; + +static inline void +grub_file_filter_unregister (grub_file_filter_id_t id) +{ + grub_file_filters_all[id] = 0; + grub_file_filters_enabled[id] = 0; +}; + +static inline void +grub_file_filter_disable (grub_file_filter_id_t id) +{ + grub_file_filters_enabled[id] = 0; +}; + +static inline void +grub_file_filter_disable_compression (void) +{ + grub_file_filter_id_t id; + + for (id = GRUB_FILE_FILTER_COMPRESSION_FIRST; + id <= GRUB_FILE_FILTER_COMPRESSION_LAST; id++) + grub_file_filters_enabled[id] = 0; +}; + +/* Get a device name from NAME. */ +char *EXPORT_FUNC(grub_file_get_device_name) (const char *name); + +grub_file_t EXPORT_FUNC(grub_file_open) (const char *name); +grub_ssize_t EXPORT_FUNC(grub_file_read) (grub_file_t file, void *buf, + grub_size_t len); +grub_off_t EXPORT_FUNC(grub_file_seek) (grub_file_t file, grub_off_t offset); +grub_err_t EXPORT_FUNC(grub_file_close) (grub_file_t file); + +/* Return value of grub_file_size() in case file size is unknown. */ +#define GRUB_FILE_SIZE_UNKNOWN 0xffffffffffffffffULL + +static inline grub_off_t +grub_file_size (const grub_file_t file) +{ + return file->size; +} + +static inline grub_off_t +grub_file_tell (const grub_file_t file) +{ + return file->offset; +} + +static inline int +grub_file_seekable (const grub_file_t file) +{ + return !file->not_easily_seekable; +} + +#endif /* ! GRUB_FILE_HEADER */ -- cgit v1.2.3