435 lines
8.8 KiB
C
435 lines
8.8 KiB
C
/*
|
|
* Copyright (c) 2007 Vreixo Formoso
|
|
*
|
|
* This file is part of the libisofs project; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation. See COPYING file for details.
|
|
*/
|
|
|
|
#include "libisofs.h"
|
|
#include "stream.h"
|
|
#include "fsource.h"
|
|
#include "util.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <limits.h>
|
|
|
|
ino_t serial_id = (ino_t)1;
|
|
ino_t mem_serial_id = (ino_t)1;
|
|
|
|
typedef struct
|
|
{
|
|
IsoFileSource *src;
|
|
|
|
/* key for file identification inside filesystem */
|
|
dev_t dev_id;
|
|
ino_t ino_id;
|
|
off_t size; /**< size of this file */
|
|
} FSrcStreamData;
|
|
|
|
static
|
|
int fsrc_open(IsoStream *stream)
|
|
{
|
|
int ret;
|
|
struct stat info;
|
|
off_t esize;
|
|
IsoFileSource *src;
|
|
if (stream == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
src = ((FSrcStreamData*)stream->data)->src;
|
|
ret = iso_file_source_stat(src, &info);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
ret = iso_file_source_open(src);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
esize = ((FSrcStreamData*)stream->data)->size;
|
|
if (info.st_size == esize) {
|
|
return ISO_SUCCESS;
|
|
} else {
|
|
return (esize > info.st_size) ? 3 : 2;
|
|
}
|
|
}
|
|
|
|
static
|
|
int fsrc_close(IsoStream *stream)
|
|
{
|
|
IsoFileSource *src;
|
|
if (stream == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
src = ((FSrcStreamData*)stream->data)->src;
|
|
return iso_file_source_close(src);
|
|
}
|
|
|
|
static
|
|
off_t fsrc_get_size(IsoStream *stream)
|
|
{
|
|
FSrcStreamData *data;
|
|
data = (FSrcStreamData*)stream->data;
|
|
|
|
return data->size;
|
|
}
|
|
|
|
static
|
|
int fsrc_read(IsoStream *stream, void *buf, size_t count)
|
|
{
|
|
IsoFileSource *src;
|
|
if (stream == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
src = ((FSrcStreamData*)stream->data)->src;
|
|
return iso_file_source_read(src, buf, count);
|
|
}
|
|
|
|
static
|
|
int fsrc_is_repeatable(IsoStream *stream)
|
|
{
|
|
int ret;
|
|
struct stat info;
|
|
FSrcStreamData *data;
|
|
if (stream == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
data = (FSrcStreamData*)stream->data;
|
|
|
|
/* mode is not cached, this function is only useful for filters */
|
|
ret = iso_file_source_stat(data->src, &info);
|
|
if (ret < 0) {
|
|
return ret;
|
|
}
|
|
if (S_ISREG(info.st_mode) || S_ISBLK(info.st_mode)) {
|
|
return 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static
|
|
void fsrc_get_id(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
|
|
ino_t *ino_id)
|
|
{
|
|
FSrcStreamData *data;
|
|
IsoFilesystem *fs;
|
|
|
|
data = (FSrcStreamData*)stream->data;
|
|
fs = iso_file_source_get_filesystem(data->src);
|
|
|
|
*fs_id = fs->get_id(fs);
|
|
*dev_id = data->dev_id;
|
|
*ino_id = data->ino_id;
|
|
}
|
|
|
|
static
|
|
void fsrc_free(IsoStream *stream)
|
|
{
|
|
FSrcStreamData *data;
|
|
data = (FSrcStreamData*)stream->data;
|
|
iso_file_source_unref(data->src);
|
|
free(data);
|
|
}
|
|
|
|
IsoStreamIface fsrc_stream_class = {
|
|
0,
|
|
"fsrc",
|
|
fsrc_open,
|
|
fsrc_close,
|
|
fsrc_get_size,
|
|
fsrc_read,
|
|
fsrc_is_repeatable,
|
|
fsrc_get_id,
|
|
fsrc_free
|
|
};
|
|
|
|
int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream)
|
|
{
|
|
int r;
|
|
struct stat info;
|
|
IsoStream *str;
|
|
FSrcStreamData *data;
|
|
|
|
if (src == NULL || stream == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
|
|
r = iso_file_source_stat(src, &info);
|
|
if (r < 0) {
|
|
return r;
|
|
}
|
|
if (S_ISDIR(info.st_mode)) {
|
|
return ISO_FILE_IS_DIR;
|
|
}
|
|
|
|
/* check for read access to contents */
|
|
r = iso_file_source_access(src);
|
|
if (r < 0) {
|
|
return r;
|
|
}
|
|
|
|
str = malloc(sizeof(IsoStream));
|
|
if (str == NULL) {
|
|
return ISO_OUT_OF_MEM;
|
|
}
|
|
data = malloc(sizeof(FSrcStreamData));
|
|
if (str == NULL) {
|
|
free(str);
|
|
return ISO_OUT_OF_MEM;
|
|
}
|
|
|
|
/* take the ref to IsoFileSource */
|
|
data->src = src;
|
|
data->size = info.st_size;
|
|
|
|
/* get the id numbers */
|
|
{
|
|
IsoFilesystem *fs;
|
|
unsigned int fs_id;
|
|
fs = iso_file_source_get_filesystem(data->src);
|
|
|
|
fs_id = fs->get_id(fs);
|
|
if (fs_id == 0) {
|
|
/*
|
|
* the filesystem implementation is unable to provide valid
|
|
* st_dev and st_ino fields. Use serial_id.
|
|
*/
|
|
data->dev_id = (dev_t) 0;
|
|
data->ino_id = serial_id++;
|
|
} else {
|
|
data->dev_id = info.st_dev;
|
|
data->ino_id = info.st_ino;
|
|
}
|
|
}
|
|
|
|
str->refcount = 1;
|
|
str->data = data;
|
|
str->class = &fsrc_stream_class;
|
|
|
|
*stream = str;
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
|
|
|
|
typedef struct
|
|
{
|
|
uint8_t *buf;
|
|
ssize_t offset; /* -1 if stream closed */
|
|
ino_t ino_id;
|
|
size_t size;
|
|
} MemStreamData;
|
|
|
|
static
|
|
int mem_open(IsoStream *stream)
|
|
{
|
|
MemStreamData *data;
|
|
if (stream == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
data = (MemStreamData*)stream->data;
|
|
if (data->offset != -1) {
|
|
return ISO_FILE_ALREADY_OPENED;
|
|
}
|
|
data->offset = 0;
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
static
|
|
int mem_close(IsoStream *stream)
|
|
{
|
|
MemStreamData *data;
|
|
if (stream == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
data = (MemStreamData*)stream->data;
|
|
if (data->offset == -1) {
|
|
return ISO_FILE_NOT_OPENED;
|
|
}
|
|
data->offset = -1;
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
static
|
|
off_t mem_get_size(IsoStream *stream)
|
|
{
|
|
MemStreamData *data;
|
|
data = (MemStreamData*)stream->data;
|
|
|
|
return (off_t)data->size;
|
|
}
|
|
|
|
static
|
|
int mem_read(IsoStream *stream, void *buf, size_t count)
|
|
{
|
|
size_t len;
|
|
MemStreamData *data;
|
|
if (stream == NULL || buf == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
if (count == 0) {
|
|
return ISO_WRONG_ARG_VALUE;
|
|
}
|
|
data = stream->data;
|
|
|
|
if (data->offset == -1) {
|
|
return ISO_FILE_NOT_OPENED;
|
|
}
|
|
|
|
if (data->offset >= data->size) {
|
|
return 0; /* EOF */
|
|
}
|
|
|
|
len = MIN(count, data->size - data->offset);
|
|
memcpy(buf, data->buf + data->offset, len);
|
|
data->offset += len;
|
|
return len;
|
|
}
|
|
|
|
static
|
|
int mem_is_repeatable(IsoStream *stream)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static
|
|
void mem_get_id(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
|
|
ino_t *ino_id)
|
|
{
|
|
MemStreamData *data;
|
|
data = (MemStreamData*)stream->data;
|
|
*fs_id = ISO_MEM_FS_ID;
|
|
*dev_id = 0;
|
|
*ino_id = data->ino_id;
|
|
}
|
|
|
|
static
|
|
void mem_free(IsoStream *stream)
|
|
{
|
|
MemStreamData *data;
|
|
data = (MemStreamData*)stream->data;
|
|
free(data->buf);
|
|
free(data);
|
|
}
|
|
|
|
IsoStreamIface mem_stream_class = {
|
|
0,
|
|
"mem ",
|
|
mem_open,
|
|
mem_close,
|
|
mem_get_size,
|
|
mem_read,
|
|
mem_is_repeatable,
|
|
mem_get_id,
|
|
mem_free
|
|
};
|
|
|
|
/**
|
|
* Create a stream for reading from a arbitrary memory buffer.
|
|
* When the Stream refcount reach 0, the buffer is free(3).
|
|
*
|
|
* @return
|
|
* 1 sucess, < 0 error
|
|
*/
|
|
int iso_memory_stream_new(unsigned char *buf, size_t size, IsoStream **stream)
|
|
{
|
|
IsoStream *str;
|
|
MemStreamData *data;
|
|
|
|
if (buf == NULL || stream == NULL) {
|
|
return ISO_NULL_POINTER;
|
|
}
|
|
|
|
str = malloc(sizeof(IsoStream));
|
|
if (str == NULL) {
|
|
return ISO_OUT_OF_MEM;
|
|
}
|
|
data = malloc(sizeof(MemStreamData));
|
|
if (str == NULL) {
|
|
free(str);
|
|
return ISO_OUT_OF_MEM;
|
|
}
|
|
|
|
/* fill data */
|
|
data->buf = buf;
|
|
data->size = size;
|
|
data->offset = -1;
|
|
data->ino_id = mem_serial_id++;
|
|
|
|
str->refcount = 1;
|
|
str->data = data;
|
|
str->class = &mem_stream_class;
|
|
|
|
*stream = str;
|
|
return ISO_SUCCESS;
|
|
}
|
|
|
|
void iso_stream_ref(IsoStream *stream)
|
|
{
|
|
++stream->refcount;
|
|
}
|
|
|
|
void iso_stream_unref(IsoStream *stream)
|
|
{
|
|
if (--stream->refcount == 0) {
|
|
stream->class->free(stream);
|
|
free(stream);
|
|
}
|
|
}
|
|
|
|
inline
|
|
int iso_stream_open(IsoStream *stream)
|
|
{
|
|
return stream->class->open(stream);
|
|
}
|
|
|
|
inline
|
|
int iso_stream_close(IsoStream *stream)
|
|
{
|
|
return stream->class->close(stream);
|
|
}
|
|
|
|
inline
|
|
off_t iso_stream_get_size(IsoStream *stream)
|
|
{
|
|
return stream->class->get_size(stream);
|
|
}
|
|
|
|
inline
|
|
int iso_stream_read(IsoStream *stream, void *buf, size_t count)
|
|
{
|
|
return stream->class->read(stream, buf, count);
|
|
}
|
|
|
|
inline
|
|
int iso_stream_is_repeatable(IsoStream *stream)
|
|
{
|
|
return stream->class->is_repeatable(stream);
|
|
}
|
|
|
|
inline
|
|
void iso_stream_get_id(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
|
|
ino_t *ino_id)
|
|
{
|
|
stream->class->get_id(stream, fs_id, dev_id, ino_id);
|
|
}
|
|
|
|
void iso_stream_get_file_name(IsoStream *stream, char *name)
|
|
{
|
|
char *type = stream->class->type;
|
|
|
|
if (!strncmp(type, "fsrc", 4)) {
|
|
FSrcStreamData *data = stream->data;
|
|
char *path = iso_file_source_get_path(data->src);
|
|
strncpy(name, path, PATH_MAX);
|
|
} else if (!strncmp(type, "boot", 4)) {
|
|
strcpy(name, "BOOT CATALOG");
|
|
} else if (!strncmp(type, "mem ", 4)) {
|
|
strcpy(name, "MEM SOURCE");
|
|
} else {
|
|
strcpy(name, "UNKNOWN SOURCE");
|
|
}
|
|
}
|