130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2007 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GRUB_FILE_HEADER
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#define GRUB_FILE_HEADER 1
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#include <grub/types.h>
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#include <grub/err.h>
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#include <grub/device.h>
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#include <grub/fs.h>
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/* File description. */
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struct grub_file
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{
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/* The underlying device. */
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grub_device_t device;
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/* The underlying filesystem. */
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grub_fs_t fs;
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/* The current offset. */
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grub_off_t offset;
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/* The file size. */
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grub_off_t size;
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/* If file is not easily seekable. Should be set by underlying layer. */
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int not_easily_seekable;
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/* Filesystem-specific data. */
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void *data;
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/* This is called when a sector is read. Used only for a disk device. */
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void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
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unsigned offset, unsigned length);
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};
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typedef struct grub_file *grub_file_t;
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/* Filters with lower ID are executed first. */
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typedef enum grub_file_filter_id
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{
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GRUB_FILE_FILTER_GZIO,
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GRUB_FILE_FILTER_XZIO,
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GRUB_FILE_FILTER_LZOPIO,
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GRUB_FILE_FILTER_MAX,
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GRUB_FILE_FILTER_COMPRESSION_FIRST = GRUB_FILE_FILTER_GZIO,
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GRUB_FILE_FILTER_COMPRESSION_LAST = GRUB_FILE_FILTER_LZOPIO,
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} grub_file_filter_id_t;
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typedef grub_file_t (*grub_file_filter_t) (grub_file_t in);
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extern grub_file_filter_t EXPORT_VAR(grub_file_filters_all)[GRUB_FILE_FILTER_MAX];
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extern grub_file_filter_t EXPORT_VAR(grub_file_filters_enabled)[GRUB_FILE_FILTER_MAX];
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static inline void
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grub_file_filter_register (grub_file_filter_id_t id, grub_file_filter_t filter)
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{
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grub_file_filters_all[id] = filter;
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grub_file_filters_enabled[id] = filter;
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};
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static inline void
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grub_file_filter_unregister (grub_file_filter_id_t id)
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{
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grub_file_filters_all[id] = 0;
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grub_file_filters_enabled[id] = 0;
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};
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static inline void
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grub_file_filter_disable (grub_file_filter_id_t id)
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{
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grub_file_filters_enabled[id] = 0;
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};
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static inline void
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grub_file_filter_disable_compression (void)
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{
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grub_file_filter_id_t id;
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for (id = GRUB_FILE_FILTER_COMPRESSION_FIRST;
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id <= GRUB_FILE_FILTER_COMPRESSION_LAST; id++)
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grub_file_filters_enabled[id] = 0;
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};
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/* Get a device name from NAME. */
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char *EXPORT_FUNC(grub_file_get_device_name) (const char *name);
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grub_file_t EXPORT_FUNC(grub_file_open) (const char *name);
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grub_ssize_t EXPORT_FUNC(grub_file_read) (grub_file_t file, void *buf,
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grub_size_t len);
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grub_off_t EXPORT_FUNC(grub_file_seek) (grub_file_t file, grub_off_t offset);
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grub_err_t EXPORT_FUNC(grub_file_close) (grub_file_t file);
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/* Return value of grub_file_size() in case file size is unknown. */
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#define GRUB_FILE_SIZE_UNKNOWN 0xffffffffffffffffULL
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static inline grub_off_t
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grub_file_size (const grub_file_t file)
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{
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return file->size;
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}
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static inline grub_off_t
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grub_file_tell (const grub_file_t file)
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{
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return file->offset;
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}
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static inline int
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grub_file_seekable (const grub_file_t file)
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{
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return !file->not_easily_seekable;
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}
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#endif /* ! GRUB_FILE_HEADER */
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