Tizen Native API  5.5
Binary Buffer

These functions provide string buffer management.

The Binary Buffer data type is designed to be a mutable string, allowing the appending, prepending or insertion of a string to a buffer.

Functions

Eina_Binbufeina_binbuf_new (void)
 Creates a new binary string buffer.
Eina_Binbufeina_binbuf_manage_new (const unsigned char *str, size_t length, Eina_Bool ro)
 Creates a new string buffer using the passed string.
Eina_Binbufeina_binbuf_manage_new_length (unsigned char *str, size_t length)
 Creates a new string buffer using the passed string.
void eina_binbuf_free (Eina_Binbuf *buf)
 Frees a string buffer.
void eina_binbuf_reset (Eina_Binbuf *buf)
 Resets a string buffer.
Eina_Bool eina_binbuf_append_length (Eina_Binbuf *buf, const unsigned char *str, size_t length)
 Expands a buffer, making room for at least minimum_unused_space.
Eina_Bool eina_binbuf_append_buffer (Eina_Binbuf *buf, const Eina_Binbuf *data)
 Appends a slice to a buffer, reallocating as necessary.
Eina_Bool eina_binbuf_append_char (Eina_Binbuf *buf, unsigned char c)
 Appends a character to a string buffer, reallocating as necessary.
Eina_Bool eina_binbuf_insert_length (Eina_Binbuf *buf, const unsigned char *str, size_t length, size_t pos)
 Inserts a string of exact length into a buffer, reallocating as necessary.
Eina_Bool eina_binbuf_insert_char (Eina_Binbuf *buf, unsigned char c, size_t pos)
 Inserts a slice into a buffer, reallocating as necessary.
Eina_Bool eina_binbuf_remove (Eina_Binbuf *buf, size_t start, size_t end)
 Removes a slice of the given string buffer.
const unsigned char * eina_binbuf_string_get (const Eina_Binbuf *buf)
 Retrieves a pointer to the contents of a string buffer.
unsigned char * eina_binbuf_string_steal (Eina_Binbuf *buf)
 Steals the contents of a string buffer.
void eina_binbuf_string_free (Eina_Binbuf *buf)
 Frees the contents of a string buffer but not the buffer.
size_t eina_binbuf_length_get (const Eina_Binbuf *buf)
 Retrieves the length of the string buffer's content.

Typedefs

typedef struct _Eina_Strbuf Eina_Binbuf

Typedef Documentation

Type for a binary string buffer.


Function Documentation

Appends a slice to a buffer, reallocating as necessary.

Parameters:
[in,out]bufThe string buffer.
[in]sliceThe slice to append.
Returns:
EINA_TRUE on success, EINA_FALSE if slice could not be appended.

This function appends slice to buf.

Since (EFL) :
1.19 Appends an Eina_Binbuf to a buffer, reallocating as necessary.
Parameters:
[in,out]bufThe string buffer.
[in]dataThe string buffer to append.
Returns:
EINA_TRUE on success, EINA_FALSE if data could not be appended.

This function appends data to buf. data must be allocated and different from NULL. It is slightly faster than eina_binbuf_append() as it does not compute the size of data.

See also:
eina_binbuf_append()
eina_binbuf_append_n()
eina_binbuf_append_length()
Since (EFL) :
1.9.0
Since :
3.0f(2.3.1)
Eina_Bool eina_binbuf_append_char ( Eina_Binbuf buf,
unsigned char  c 
)

Appends a character to a string buffer, reallocating as necessary.

Parameters:
[in,out]bufThe string buffer.
[in]cThe char to append.
Returns:
EINA_TRUE on success, EINA_FALSE if c could not be inserted.

This function appends c to buf.

Since :
2.3
Eina_Bool eina_binbuf_append_length ( Eina_Binbuf buf,
const unsigned char *  str,
size_t  length 
)

Expands a buffer, making room for at least minimum_unused_space.

Parameters:
[in,out]bufThe Buffer to expand.
[in]minimum_unused_spaceThe minimum unused allocated space, in bytes, at the end of the buffer. Zero can be used to query the available slice of unused bytes.
Returns:
The slice of unused bytes. The slice length may be zero if minimum_unused_space couldn't be allocated, otherwise it will be at least minimum_unused_space. After bytes are used, mark them as such using eina_binbuf_use().

One of the properties of the buffer is that it may overallocate space, thus it may have more than eina_binbuf_length_get() bytes allocated. How much depends on the buffer growth logic, but this function allows requesting a minimum amount of bytes to be allocated at the end of the buffer.

This is particularly useful to write directly to buffer's memory (i.e.: a call to read(2)). After the bytes are used call eina_binbuf_use() to mark them as such, so eina_binbuf_length_get() will account for the new bytes.

See also:
eina_binbuf_rw_slice_get()
eina_binbuf_use()
Since (EFL) :
1.19 Marks more bytes as used.
Parameters:
[in,out]bufThe string buffer.
[in]extra_bytesthe number of bytes to be considered used, must be between zero and the length of the slice returned by eina_binbuf_expand().
Returns:
EINA_TRUE on success, EINA_FALSE on failure, such as extra_bytes is too big or buf is NULL.

This function should be used after eina_binbuf_expand(), marking the extra bytes returned there as used, then they will be taken into account by other functions, such as eina_binbuf_length_get().

See also:
eina_binbuf_expand()
Since (EFL) :
1.19 Appends a string of exact length to a buffer, reallocating as necessary.
Parameters:
[in,out]bufThe string buffer.
[in]strThe string to append.
[in]lengthThe exact length to use.
Returns:
EINA_TRUE on success, EINA_FALSE if str could not be appended.

This function appends str to buf. str must be of size at most length. It is slightly faster than eina_binbuf_append() as it does not compute the size of str. It is useful when dealing with strings of known size, such as eina_stringshare.

See also:
eina_stringshare_length()
eina_binbuf_append()
eina_binbuf_append_n()
Since :
2.3
void eina_binbuf_free ( Eina_Binbuf buf)

Frees a string buffer.

Parameters:
[in,out]bufThe string buffer.

This function frees the memory of buf. buf must have been created by eina_binbuf_new().

Since :
2.3
Eina_Bool eina_binbuf_insert_char ( Eina_Binbuf buf,
unsigned char  c,
size_t  pos 
)

Inserts a slice into a buffer, reallocating as necessary.

Parameters:
[in,out]bufThe string buffer.
[in]sliceThe slice to insert.
[in]posThe position to insert the string.
Returns:
EINA_TRUE on success, EINA_FALSE if slice could not be inserted.

This function inserts slice into buf at position pos.

Since (EFL) :
1.19.0 Inserts a character into a string buffer, reallocating as necessary.
Parameters:
[in,out]bufThe string buffer.
[in]cThe char to insert.
[in]posThe position to insert the char.
Returns:
EINA_TRUE on success, EINA_FALSE if c could not be inserted.

This function inserts c to buf at position pos.

Since :
2.3
Eina_Bool eina_binbuf_insert_length ( Eina_Binbuf buf,
const unsigned char *  str,
size_t  length,
size_t  pos 
)

Inserts a string of exact length into a buffer, reallocating as necessary.

Parameters:
[in,out]bufThe string buffer.
[in]strThe string to insert.
[in]lengthThe exact length to use.
[in]posThe position to insert the string.
Returns:
EINA_TRUE on success, EINA_FALSE if str could not be inserted.

This function inserts str into buf. str must be no longer than length. It is slightly faster than eina_binbuf_insert() as it does not compute the size of str. It is useful when dealing with strings of known size, such as eina_stringshare.

See also:
eina_stringshare_length()
eina_binbuf_insert()
eina_binbuf_insert_n()
Since :
2.3
size_t eina_binbuf_length_get ( const Eina_Binbuf buf)

Retrieves the length of the string buffer's content.

Parameters:
[in]bufThe string buffer.
Returns:
The current length of the string, in bytes.

This function returns the length of buf.

Since :
2.3
Eina_Binbuf* eina_binbuf_manage_new ( const unsigned char *  str,
size_t  length,
Eina_Bool  ro 
)

Creates a new string buffer using the passed string.

Parameters:
[in]strThe string to manage.
[in]lengthThe length of the string.
[in]roThe passed string will not be touched if set to EINA_TRUE.
Returns:
Newly allocated string buffer instance, or NULL on error.

This function creates a new binary string buffer. The passed string is used directly as the buffer, it's effectively the inverse of eina_binbuf_string_steal().

If ro is EINA_TRUE, then str will be treated as read-only. Other routines using this buffer that would normally modify the string, will instead create a separate copy to modify and return.

To free the resources, use eina_binbuf_free().

See also:
eina_binbuf_manage_new()
eina_binbuf_manage_new_length()
eina_binbuf_manage_read_only_new_length()
Since (EFL) :
1.14.0
Since :
3.0f(2.3.1)
Eina_Binbuf* eina_binbuf_manage_new_length ( unsigned char *  str,
size_t  length 
)

Creates a new string buffer using the passed string.

Parameters:
[in]strThe string to manage.
[in]lengthThe length of the string.
Returns:
Newly allocated string buffer instance, or NULL on error.

This function creates a new string buffer. To free the resources, use eina_binbuf_free().

See also:
eina_binbuf_manage_new()
Since (EFL) :
1.2.0
Since :
2.3

Creates a new binary string buffer.

Returns:
Newly allocated string buffer instance, or NULL on error.

This function creates a new string buffer. To free the resources, use eina_binbuf_free().

See also:
eina_binbuf_free()
eina_binbuf_append()
eina_binbuf_string_get()
Since :
2.3
Eina_Bool eina_binbuf_remove ( Eina_Binbuf buf,
size_t  start,
size_t  end 
)

Removes a slice of the given string buffer.

Parameters:
[in,out]bufThe string buffer.
[in]startThe initial (inclusive) slice position to start removing, in bytes.
[in]endThe final (non-inclusive) slice position to finish removing, in bytes.
Returns:
EINA_TRUE on success, EINA_FALSE on failure.

This function removes a slice of buf, starting at start (inclusive) and ending at end (non-inclusive). Both values are in bytes.

Since :
2.3
void eina_binbuf_reset ( Eina_Binbuf buf)

Resets a string buffer.

Parameters:
[in,out]bufThe string buffer.

This function resets buf: the buffer len is set to 0, and the string is set to '\0'. No memory is freed.

Since :
2.3

Frees the contents of a string buffer but not the buffer.

Parameters:
[in,out]bufThe string buffer.

This function frees the string contained in buf without freeing buf.

Since :
2.3
const unsigned char* eina_binbuf_string_get ( const Eina_Binbuf buf)

Retrieves a pointer to the contents of a string buffer.

Parameters:
[in]bufThe string buffer.
Returns:
The string that is contained in buf.

This function returns the string contained in buf. The returned value must not be modified and will no longer be valid if buf is modified. In other words, calling eina_binbuf_append() or similar functions will make the pointer invalid.

See also:
eina_binbuf_string_steal()
Since :
2.3
unsigned char* eina_binbuf_string_steal ( Eina_Binbuf buf)

Steals the contents of a string buffer.

Parameters:
[in,out]bufThe string buffer.
Returns:
The string that was contained in buf.

This function returns the string contained in buf. buf is then initialized and does not own the returned string anymore. The caller must release the memory of the returned string by calling free().

See also:
eina_binbuf_string_get()
Since :
2.3