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Add IsoFileSource implementation for local filesystem.

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This commit is contained in:
Vreixo Formoso
2007-11-25 16:46:21 +01:00
parent 6c090c9a7b
commit 1bda81869b
7 changed files with 484 additions and 7 deletions
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346
src/fs_local.c
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@ -6,10 +6,354 @@
* published by the Free Software Foundation. See COPYING file for details.
*/
/*
* Filesystem/FileSource implementation to access the local filesystem.
*/
#include "fsource.h"
#include "error.h"
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <dirent.h>
#include <unistd.h>
#include <string.h>
typedef struct
{
/* IsoFilesystem *fs; It seems not needed */
char *path;
unsigned int openned:2; /* 0: not openned, 1: file, 2:dir */
union {
int fd;
DIR *dir;
} info;
} _LocalFsFileSource;
static
const char* lfs_get_path(IsoFileSource *src)
{
_LocalFsFileSource *data;
data = src->data;
return data->path;
}
static
int lfs_lstat(IsoFileSource *src, struct stat *info)
{
_LocalFsFileSource *data;
if (src == NULL || info == NULL) {
return ISO_NULL_POINTER;
}
data = src->data;
if (lstat(data->path, info) != 0) {
int err;
/* error, choose an appropriate return code */
switch(errno) {
case EACCES:
err = ISO_FILE_ACCESS_DENIED;
break;
case ENOTDIR:
case ENAMETOOLONG:
case ELOOP:
err = ISO_FILE_BAD_PATH;
break;
case ENOENT:
err = ISO_FILE_DOESNT_EXIST;
break;
case EFAULT:
case ENOMEM:
err = ISO_MEM_ERROR;
break;
default:
err = ISO_FILE_ERROR;
break;
}
return err;
}
return ISO_SUCCESS;
}
static
int lfs_open(IsoFileSource *src)
{
int err;
struct stat info;
_LocalFsFileSource *data;
if (src == NULL) {
return ISO_NULL_POINTER;
}
data = src->data;
if (data->openned) {
return ISO_FILE_ALREADY_OPENNED;
}
/* is a file or a dir ? */
err = lfs_lstat(src, &info);
if (err < 0) {
return err;
}
if (S_ISDIR(info.st_mode)) {
data->info.dir = opendir(data->path);
data->openned = data->info.dir ? 2 : 0;
} else {
data->info.fd = open(data->path, O_RDONLY);
data->openned = data->info.fd != -1 ? 1 : 0;
}
/*
* check for possible errors, note that many of possible ones are
* parsed in the lstat call above
*/
if (data->openned == 0) {
switch(errno) {
case EACCES:
err = ISO_FILE_ACCESS_DENIED;
break;
case EFAULT:
case ENOMEM:
err = ISO_MEM_ERROR;
break;
default:
err = ISO_FILE_ERROR;
break;
}
return err;
}
return ISO_SUCCESS;
}
static
int lfs_close(IsoFileSource *src)
{
_LocalFsFileSource *data;
if (src == NULL) {
return ISO_NULL_POINTER;
}
data = src->data;
switch(data->openned) {
case 1: /* not dir */
return close(data->info.fd) == 0 ? ISO_SUCCESS : ISO_FILE_ERROR;
case 2: /* directory */
return closedir(data->info.dir) == 0 ? ISO_SUCCESS : ISO_FILE_ERROR;
default:
return ISO_FILE_NOT_OPENNED;
}
}
static
int lfs_read(IsoFileSource *src, void *buf, size_t count)
{
_LocalFsFileSource *data;
if (src == NULL || buf == NULL) {
return ISO_NULL_POINTER;
}
data = src->data;
switch(data->openned) {
case 1: /* not dir */
{
int ret;
ret = read(data->info.fd, buf, count);
if (ret < 0) {
/* error on read */
switch(errno) {
case EINTR:
ret = ISO_INTERRUPTED;
break;
case EFAULT:
ret = ISO_MEM_ERROR;
break;
case EIO:
ret = ISO_FILE_READ_ERROR;
break;
default:
ret = ISO_FILE_ERROR;
break;
}
}
return ret;
}
case 2: /* directory */
return ISO_FILE_IS_DIR;
default:
return ISO_FILE_NOT_OPENNED;
}
}
static
int lfs_readdir(IsoFileSource *src, IsoFileSource **child)
{
_LocalFsFileSource *data;
if (src == NULL || child == NULL) {
return ISO_NULL_POINTER;
}
data = src->data;
switch(data->openned) {
case 1: /* not dir */
return ISO_FILE_IS_NOT_DIR;
case 2: /* directory */
{
char *path;
struct dirent *entry;
size_t a, b;
int ret;
entry = readdir(data->info.dir);
if (entry == NULL) {
if (errno == EBADF)
return ISO_FILE_ERROR;
else
return 0; /* EOF */
}
/* constructs the new path */
a = strlen(data->path);
b = strlen(entry->d_name);
path = malloc(a + b + 2);
if (path == NULL) {
return ISO_MEM_ERROR;
}
strncpy(path, data->path, a);
path[a] = '/';
path[a + 1] = '\0';
strncat(path, entry->d_name, b);
/* create the new FileSrc */
ret = iso_file_source_new_lfs(path, child);
if (ret < 0) {
free(path);
}
return ret;
}
default:
return ISO_FILE_NOT_OPENNED;
}
}
static
int lfs_readlink(IsoFileSource *src, char *buf, size_t bufsiz)
{
int size;
_LocalFsFileSource *data;
if (src == NULL || buf == NULL) {
return ISO_NULL_POINTER;
}
if (bufsiz <= 0) {
return ISO_WRONG_ARG_VALUE;
}
data = src->data;
/*
* invoke readlink, with bufsiz -1 to reserve an space for
* the NULL character
*/
size = readlink(data->path, buf, bufsiz - 1);
if (size < 0) {
/* error */
switch(errno) {
case EACCES:
return ISO_FILE_ACCESS_DENIED;
case ENOTDIR:
case ENAMETOOLONG:
case ELOOP:
return ISO_FILE_BAD_PATH;
case ENOENT:
return ISO_FILE_DOESNT_EXIST;
case EINVAL:
return ISO_FILE_IS_NOT_SYMLINK;
case EFAULT:
case ENOMEM:
return ISO_MEM_ERROR;
default:
return ISO_FILE_ERROR;
}
}
/* NULL-terminate the buf */
buf[size] = '\0';
return ISO_SUCCESS;
}
static
void lfs_free(IsoFileSource *src)
{
_LocalFsFileSource *data;
data = src->data;
/* close the file if it is already openned */
if (data->openned) {
src->close(src);
}
free(data->path);
free(data);
}
/**
*
* @return
* 1 success, < 0 error
*/
int iso_file_source_new_lfs(char *path, IsoFileSource **src)
{
IsoFileSource *lfs_src;
_LocalFsFileSource *data;
if (src == NULL) {
return ISO_NULL_POINTER;
}
/* allocate memory */
data = malloc(sizeof(_LocalFsFileSource));
if (data == NULL) {
return ISO_OUT_OF_MEM;
}
lfs_src = malloc(sizeof(IsoFileSource));
if (lfs_src == NULL) {
free(data);
return ISO_OUT_OF_MEM;
}
/* fill struct */
data->path = path;
data->openned = 0;
lfs_src->refcount = 1;
lfs_src->data = data;
lfs_src->get_path = lfs_get_path;
lfs_src->lstat = lfs_lstat;
lfs_src->open = lfs_open;
lfs_src->close = lfs_close;
lfs_src->read = lfs_read;
lfs_src->readdir = lfs_readdir;
lfs_src->readlink = lfs_readlink;
lfs_src->free = lfs_free;
/* return */
*src = lfs_src;
return ISO_SUCCESS;
}