SMFS Reference
SMFS is a Secure Memory File System (as exported to FMs). It allows FMs to store keys in tamper protected battery backed non-volatile RAM (NVRAM).
It has the following general specifications:
>Arbitrary depth directory structure supported
>File names are any character other than '\0' or '/'
>Path separator is '/'. The Windows \ is not allowed
>Files are fixed size and initialized with zeros when created
>Directories will expand in size as needed to fit more files
This chapter contains the following sections:
>File Attributes Structure (SmFsAttr)
Important Constants
>Maximum file name length is 16
>Maximum path length is 100
>Maximum number of open files is 32
>Maximum number of file search handles is 16
Error Codes
| SMFS_ERR_ERROR | A general error has occurred |
| SMFS_ERR_NOT_INITED | The SMFS has not been initialized |
| SMFS_ERR_MEMORY | The SMFS has run out of memory |
| SMFS_ERR_NAME_TOO_LONG | The name given for a file is too long |
| SMFS_ERR_RESOURCES | The SMFS has run out of resources |
| SMFS_ERR_PARAMETER | An invalid parameter was passed to SMFS |
| SMFS_ERR_ACCESS | User does not have request access to file |
| SMFS_ERR_NOT_FOUND | Requested file was not found |
| SMFS_ERR_BUSY | Operation is being attempted on an open file |
| SMFS_ERR_EXIST | A file being created already exists |
| SMFS_ERR_FILE_TYPE | Operation being performed on wrong file type |
File Attributes Structure (SmFsAttr)
Synopsis
SmFsAttr {
unsigned int Size;
unsigned int isDir;
};
Description
This structure holds the file or directory attributes
Members
| Size | Current file size in bytes or directory size in entries. |
| isDir | Flag specifying if file is a directory. |
Function Descriptions
The SMFS reference section contains the following functions:
