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/*
* 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 <http://www.gnu.org/licenses/>.
*/
#ifndef GRUB_FILE_HEADER
#define GRUB_FILE_HEADER 1
#include <grub/types.h>
#include <grub/err.h>
#include <grub/device.h>
#include <grub/fs.h>
/* 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 */
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