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FM SDK Programming Guide > SMFS Reference
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SMFS is a Secure Memory File System (as exported to FMs).
It allows FMs to store keys into tamper-protected battery-backed Static RAM (SRAM)
It has the following general specifications:
•Arbitrary depth directory structure supported.
•File names are any character other than '\' or '/'.
•Path separator is '/' (the Windows '\' is not allowed)
•Files are of 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)
•Max file name length is 16
•Max path length is 100
•Max number of open files is 32
•Max number of file search handles is 16
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SMFS_ERR_ERROR |
1 | A general error has occurred |
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SMFS_ERR_NOT_INITED |
2 |
The SMFS has not been initialized |
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SMFS_ERR_MEMORY |
3 |
The SMFS has run out of memory |
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SMFS_ERR_NAME_TOO_LONG |
4 |
The name given for a file is too long |
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SMFS_ERR_RESOURCES |
5 |
The SMFS has run out of resources |
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SMFS_ERR_PARAMETER |
6 |
An invalid parameter was passed to SMFS |
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SMFS_ERR_ACCESS |
7 |
User does not have request access to file |
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SMFS_ERR_NOT_FOUND |
8 |
Requested file was not found |
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SMFS_ERR_BUSY |
9 |
Operation is being attempted on an open file |
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SMFS_ERR_EXIST |
10 |
A file being created already exists |
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SMFS_ERR_FILE_TYPE |
11 |
Operation being performed on wrong file type |
SmFsAttr {
unsigned int Size;
unsigned int isDir;
};
This structure holds the file or directory attributes
Size: Current file size in bytes or directory size in entries
isDir: Flag specifying if file is a directory