Tizen Native API  5.5
Eet Data Serialization using A Ciphers

Most of the Eet Data Serialization have alternative versions that accounts for ciphers to protect their content.

See also:
Cipher, Identity and Protection Mechanisms

Functions

void * eet_data_read_cipher (Eet_File *ef, Eet_Data_Descriptor *edd, const char *name, const char *cipher_key)
 Reads a data structure from an eet file and decodes it using a cipher.
void * eet_data_read_cipher_buffer (Eet_File *ef, Eet_Data_Descriptor *edd, const char *name, const char *cipher_key, char *buffer, int buffer_size)
 Reads a data structure from an eet file and decodes it into a buffer using a cipher.
void * eet_data_xattr_cipher_get (const char *filename, const char *attribute, Eet_Data_Descriptor *edd, const char *cipher_key)
 Reads a data structure from an eet extended attribute and decodes it using a cipher.
int eet_data_write_cipher (Eet_File *ef, Eet_Data_Descriptor *edd, const char *name, const char *cipher_key, const void *data, int compress)
 Writes a data structure from memory and store in an eet file using a cipher.
Eina_Bool eet_data_xattr_cipher_set (const char *filename, const char *attribute, Eet_Data_Descriptor *edd, const char *cipher_key, const void *data, Eina_Xattr_Flags flags)
 Writes a data structure from memory and store in an eet extended attribute using a cipher.
int eet_data_text_dump_cipher (const void *data_in, const char *cipher_key, int size_in, Eet_Dump_Callback dumpfunc, void *dumpdata)
 Dumps an eet encoded data structure into ascii text using a cipher.
void * eet_data_text_undump_cipher (const char *text, const char *cipher_key, int textlen, int *size_ret)
 Takes an ascii encoding from eet_data_text_dump() and re-encode in binary using a cipher.
int eet_data_dump_cipher (Eet_File *ef, const char *name, const char *cipher_key, Eet_Dump_Callback dumpfunc, void *dumpdata)
 Dumps an eet encoded data structure from an eet file into ascii text using a cipher.
int eet_data_undump_cipher (Eet_File *ef, const char *name, const char *cipher_key, const char *text, int textlen, int compress)
 Takes an ascii encoding from eet_data_dump() and re-encode in binary using a cipher.
void * eet_data_descriptor_decode_cipher (Eet_Data_Descriptor *edd, const void *data_in, const char *cipher_key, int size_in)
 Decodes a data structure from an arbitrary location in memory using a cipher.
void * eet_data_descriptor_encode_cipher (Eet_Data_Descriptor *edd, const void *data_in, const char *cipher_key, int *size_ret)
 Encodes a data struct to memory and return that encoded data using a cipher.

Function Documentation

void* eet_data_descriptor_decode_cipher ( Eet_Data_Descriptor edd,
const void *  data_in,
const char *  cipher_key,
int  size_in 
)

Decodes a data structure from an arbitrary location in memory using a cipher.

Parameters:
eddThe data descriptor to use when decoding.
data_inThe pointer to the data to decode into a struct.
cipher_keyThe key to use as cipher.
size_inThe size of the data pointed to in bytes.
Returns:
NULL on failure, or a valid decoded struct pointer on success.

This function will decode a data structure that has been encoded using eet_data_descriptor_encode(), and return a data structure with all its elements filled out, if successful, or NULL on failure.

The data to be decoded is stored at the memory pointed to by data_in, and is described by the descriptor pointed to by edd. The data size is passed in as the value to size_in, and must be greater than 0 to succeed.

This function is useful for decoding data structures delivered to the application by means other than an eet file, such as an IPC or socket connection, raw files, shared memory etc.

Please see eet_data_read() for more information.

See also:
eet_data_descriptor_decode()
Since:
1.0.0

3.0

void* eet_data_descriptor_encode_cipher ( Eet_Data_Descriptor edd,
const void *  data_in,
const char *  cipher_key,
int *  size_ret 
)

Encodes a data struct to memory and return that encoded data using a cipher.

Parameters:
eddThe data descriptor to use when encoding.
data_inThe pointer to the struct to encode into data.
cipher_keyThe key to use as cipher.
size_retpointer to the an int to be filled with the decoded size.
Returns:
NULL on failure, or a valid encoded data chunk on success.

This function takes a data structure in memory and encodes it into a serialised chunk of data that can be decoded again by eet_data_descriptor_decode(). This is useful for being able to transmit data structures across sockets, pipes, IPC or shared file mechanisms, without having to worry about memory space, machine type, endianness etc.

The parameter edd must point to a valid data descriptor, and data_in must point to the right data structure to encode. If not, the encoding may fail.

On success a non NULL valid pointer is returned and what size_ret points to is set to the size of this decoded data, in bytes. When the encoded data is no longer needed, call free() on it. On failure NULL is returned and what size_ret points to is set to 0.

Please see eet_data_write() for more information.

See also:
eet_data_descriptor_encode()
Since:
1.0.0

3.0

int eet_data_dump_cipher ( Eet_File ef,
const char *  name,
const char *  cipher_key,
Eet_Dump_Callback  dumpfunc,
void *  dumpdata 
)

Dumps an eet encoded data structure from an eet file into ascii text using a cipher.

Parameters:
efA valid eet file handle.
nameName of the entry. eg: "/base/file_i_want".
cipher_keyThe key to use as cipher.
dumpfuncThe function to call passed a string when new data is converted to text
dumpdataThe data to pass to the dumpfunc callback.
Returns:
1 on success, 0 on failure

This function will take an open and valid eet file from eet_open() request the data encoded by eet_data_descriptor_encode() corresponding to the key name and convert it into human readable ascii text. It does this by calling the dumpfunc callback for all new text that is generated. This callback should append to any existing text buffer and will be passed the pointer dumpdata as a parameter as well as a string with new text to be appended.

See also:
eet_data_dump()
Since:
1.0.0

3.0

void* eet_data_read_cipher ( Eet_File ef,
Eet_Data_Descriptor edd,
const char *  name,
const char *  cipher_key 
)

Reads a data structure from an eet file and decodes it using a cipher.

Parameters:
efThe eet file handle to read from.
eddThe data descriptor handle to use when decoding.
nameThe key the data is stored under in the eet file.
cipher_keyThe key to use as cipher.
Returns:
A pointer to the decoded data structure.

This function decodes a data structure stored in an eet file, returning a pointer to it if it decoded successfully, or NULL on failure. This can save a programmer dozens of hours of work in writing configuration file parsing and writing code, as eet does all that work for the program and presents a program-friendly data structure, just as the programmer likes. Eet can handle members being added or deleted from the data in storage and safely zero-fills unfilled members if they were not found in the data. It checks sizes and headers whenever it reads data, allowing the programmer to not worry about corrupt data.

Once a data structure has been described by the programmer with the fields they wish to save or load, storing or retrieving a data structure from an eet file, or from a chunk of memory is as simple as a single function call.

See also:
eet_data_read()
Since:
1.0.0

3.0

void* eet_data_read_cipher_buffer ( Eet_File ef,
Eet_Data_Descriptor edd,
const char *  name,
const char *  cipher_key,
char *  buffer,
int  buffer_size 
)

Reads a data structure from an eet file and decodes it into a buffer using a cipher.

Parameters:
efThe eet file handle to read from.
eddThe data descriptor handle to use when decoding.
nameThe key the data is stored under in the eet file.
cipher_keyThe key to use as cipher.
bufferBuffer.
buffer_sizeThe buffer size.
Returns:
A pointer to buffer if successful, and NULL on error.

This function decodes a data structure stored in an eet file, returning a pointer to it if it decoded successfully, or NULL on failure. This can save a programmer dozens of hours of work in writing configuration file parsing and writing code, as eet does all that work for the program and presents a program-friendly data structure, just as the programmer likes. Eet can handle members being added or deleted from the data in storage and safely zero-fills unfilled members if they were not found in the data. It checks sizes and headers whenever it reads data, allowing the programmer to not worry about corrupt data.

Once a data structure has been described by the programmer with the fields they wish to save or load, storing or retrieving a data structure from an eet file, or from a chunk of memory is as simple as a single function call.

See also:
eet_data_read_cipher()
Since:
1.10.0

3.0

int eet_data_text_dump_cipher ( const void *  data_in,
const char *  cipher_key,
int  size_in,
Eet_Dump_Callback  dumpfunc,
void *  dumpdata 
)

Dumps an eet encoded data structure into ascii text using a cipher.

Parameters:
data_inThe pointer to the data to decode into a struct.
cipher_keyThe key to use as cipher.
size_inThe size of the data pointed to in bytes.
dumpfuncThe function to call passed a string when new data is converted to text
dumpdataThe data to pass to the dumpfunc callback.
Returns:
1 on success, 0 on failure

This function will take a chunk of data encoded by eet_data_descriptor_encode() and convert it into human readable ascii text. It does this by calling the dumpfunc callback for all new text that is generated. This callback should append to any existing text buffer and will be passed the pointer dumpdata as a parameter as well as a string with new text to be appended.

Example:

 void output(void *data, const char *string)
 {
   printf("%s", string);
 }

 void dump(const char *file)
 {
   FILE *f;
   int len;
   void *data;

   f = fopen(file, "rb");
   fseek(f, 0, SEEK_END);
   len = ftell(f);
   rewind(f);
   data = malloc(len);
   fread(data, len, 1, f);
   fclose(f);
   eet_data_text_dump_cipher(data, cipher_key, len, output, NULL);
 }
See also:
eet_data_text_dump()
Since:
1.0.0

3.0

void* eet_data_text_undump_cipher ( const char *  text,
const char *  cipher_key,
int  textlen,
int *  size_ret 
)

Takes an ascii encoding from eet_data_text_dump() and re-encode in binary using a cipher.

Parameters:
textThe pointer to the string data to parse and encode.
cipher_keyThe key to use as cipher.
textlenThe size of the string in bytes (not including 0 byte terminator).
size_retThis gets filled in with the encoded data blob size in bytes.
Returns:
The encoded data on success, NULL on failure.

This function will parse the string pointed to by text and return an encoded data lump the same way eet_data_descriptor_encode() takes an in-memory data struct and encodes into a binary blob. text is a normal C string.

See also:
eet_data_text_undump()
Since:
1.0.0

3.0

int eet_data_undump_cipher ( Eet_File ef,
const char *  name,
const char *  cipher_key,
const char *  text,
int  textlen,
int  compress 
)

Takes an ascii encoding from eet_data_dump() and re-encode in binary using a cipher.

Parameters:
efA valid eet file handle.
nameName of the entry. eg: "/base/file_i_want".
cipher_keyThe key to use as cipher.
textThe pointer to the string data to parse and encode.
textlenThe size of the string in bytes (not including 0 byte terminator).
compressCompression flags (1 == compress, 0 = don't compress).
Returns:
1 on success, 0 on failure

This function will parse the string pointed to by text, encode it the same way eet_data_descriptor_encode() takes an in-memory data struct and encodes into a binary blob.

The data (optionally compressed) will be in ram, pending a flush to disk (it will stay in ram till the eet file handle is closed though).

See also:
eet_data_undump()
Since:
1.0.0

3.0

int eet_data_write_cipher ( Eet_File ef,
Eet_Data_Descriptor edd,
const char *  name,
const char *  cipher_key,
const void *  data,
int  compress 
)

Writes a data structure from memory and store in an eet file using a cipher.

Parameters:
efThe eet file handle to write to.
eddThe data descriptor to use when encoding.
nameThe key to store the data under in the eet file.
cipher_keyThe key to use as cipher.
dataA pointer to the data structure to save and encode.
compressCompression flags for storage.
Returns:
bytes written on successful write, 0 on failure.

This function is the reverse of eet_data_read_cipher(), saving a data structure to an eet file.

Since:
1.0.0

3.0

void* eet_data_xattr_cipher_get ( const char *  filename,
const char *  attribute,
Eet_Data_Descriptor edd,
const char *  cipher_key 
)

Reads a data structure from an eet extended attribute and decodes it using a cipher.

Parameters:
filenameThe file to extract the extended attribute from.
attributeThe attribute to get the data from.
eddThe data descriptor handle to use when decoding.
cipher_keyThe key to use as cipher.
Returns:
A pointer to the decoded data structure.

This function decodes a data structure stored in an eet extended attribute, returning a pointer to it if it decoded successfully, or NULL on failure. Eet can handle members being added or deleted from the data in storage and safely zero-fills unfilled members if they were not found in the data. It checks sizes and headers whenever it reads data, allowing the programmer to not worry about corrupt data.

Once a data structure has been described by the programmer with the fields they wish to save or load, storing or retrieving a data structure from an eet file, from a chunk of memory or from an extended attribute is as simple as a single function call.

Since:
1.5.0

3.0

Eina_Bool eet_data_xattr_cipher_set ( const char *  filename,
const char *  attribute,
Eet_Data_Descriptor edd,
const char *  cipher_key,
const void *  data,
Eina_Xattr_Flags  flags 
)

Writes a data structure from memory and store in an eet extended attribute using a cipher.

Parameters:
filenameThe file to write the extended attribute to.
attributeThe attribute to store the data to.
eddThe data descriptor to use when encoding.
cipher_keyThe key to use as cipher.
dataA pointer to the data structure to save and encode.
flagsThe policy to use when setting the data.
Returns:
EINA_TRUE on success, EINA_FALSE on failure.

This function is the reverse of eet_data_xattr_cipher_get(), saving a data structure to an eet extended attribute.

Since:
1.5.0

3.0