10.5 Buffer Object Structures

The buffer interface exports a model where an object can expose its internal data as a set of chunks of data, where each chunk is specified as a pointer/length pair. These chunks are called segments and are presumed to be non-contiguous in memory.

If an object does not export the buffer interface, then its tp_as_buffer member in the PyTypeObject structure should be NULL. Otherwise, the tp_as_buffer will point to a PyBufferProcs structure.

Note: It is very important that your PyTypeObject structure uses Py_TPFLAGS_DEFAULT for the value of the tp_flags member rather than 0. This tells the Python runtime that your PyBufferProcs structure contains the bf_getcharbuffer slot. Older versions of Python did not have this member, so a new Python interpreter using an old extension needs to be able to test for its presence before using it.

PyBufferProcs

Structure used to hold the function pointers which define an implementation of the buffer protocol.

The first slot is bf_getreadbuffer, of type getreadbufferproc. If this slot is NULL, then the object does not support reading from the internal data. This is non-sensical, so implementors should fill this in, but callers should test that the slot contains a non-NULL value.

The next slot is bf_getwritebuffer having type getwritebufferproc. This slot may be NULL if the object does not allow writing into its returned buffers.

The third slot is bf_getsegcount, with type getsegcountproc. This slot must not be NULL and is used to inform the caller how many segments the object contains. Simple objects such as PyString_Type and PyBuffer_Type objects contain a single segment.

The last slot is bf_getcharbuffer, of type getcharbufferproc. This slot will only be present if the Py_TPFLAGS_HAVE_GETCHARBUFFER flag is present in the tp_flags field of the object's PyTypeObject. Before using this slot, the caller should test whether it is present by using the PyType_HasFeature()function. If present, it may be NULL, indicating that the object's contents cannot be used as 8-bit characters. The slot function may also raise an error if the object's contents cannot be interpreted as 8-bit characters. For example, if the object is an array which is configured to hold floating point values, an exception may be raised if a caller attempts to use bf_getcharbuffer to fetch a sequence of 8-bit characters. This notion of exporting the internal buffers as ``text'' is used to distinguish between objects that are binary in nature, and those which have character-based content.

Note: The current policy seems to state that these characters may be multi-byte characters. This implies that a buffer size of N does not mean there are N characters present.

Py_TPFLAGS_HAVE_GETCHARBUFFER: Flag bit set in the type structure to indicate that the bf_getcharbuffer slot is known. This being set does not indicate that the object supports the buffer interface or that the bf_getcharbuffer slot is non-NULL.

int (*getreadbufferproc) (PyObject *self, int segment, void **ptrptr): Return a pointer to a readable segment of the buffer. This function is allowed to raise an exception, in which case it must return -1. The segment which is passed must be zero or positive, and strictly less than the number of segments returned by the bf_getsegcount slot function. On success, it returns the length of the buffer memory, and sets *ptrptr to a pointer to that memory.

int (*getwritebufferproc) (PyObject *self, int segment, void **ptrptr): Return a pointer to a writable memory buffer in *ptrptr, and the length of that segment as the function return value. The memory buffer must correspond to buffer segment segment. Must return -1 and set an exception on error. TypeError should be raised if the object only supports read-only buffers, and SystemError should be raised when segment specifies a segment that doesn't exist.

int (*getsegcountproc) (PyObject *self, int *lenp): Return the number of memory segments which comprise the buffer. If lenp is not NULL, the implementation must report the sum of the sizes (in bytes) of all segments in *lenp. The function cannot fail.

int (*getcharbufferproc) (PyObject *self, int segment, const char **ptrptr)

See About this document... for information on suggesting changes.

iPhone 6 battery cover
hawaiian shoes
Volcom Board Shorts
Billabong Board Shorts
Quicksilver Board Shorts
I got a new iPhone5 battery case that I found on the web. I have a new ipad and I just love it. My new HTC One cellphone is awesome. I ordered a new iphone5 and I can't wait to get it. The smartphone charger I purchased is exactly what I needed. The new HTC phone is the best. I need more used AOL disks for my computer. The new hawaiian shoes has a new larger display.
hawaiian shoes
hawaiian shoes
You should look at List of surf and skate and this site iPhone Cases and this website too iPhone Cases
hawaiian sandals

hawaiian shoes

mophie Juice Pack Plus iPhone 6 plus battery pack is the best there is.

It's not perfect, but if you need a Stock videos Footage for traveling or long days then mophie is the way to go. Battery life is always an issue on every smartphone nowadays and third-party manufacturers provide external battery power supplies to ensure that life of your device will last for more than a day. I found arch support sandal on the Although traditionally mens work boots mens work boots are made with leather, the work boots work boots can also be made of a composite rubber, a plastic such as thermoplastic or even leather. website. We got a pair of Rigoberto Ramirez and Rigoberto Ramirez too. There are two hawaiian shoes and my favorite Rigoberto Ramirez. That's why there are portable power packs—when the power is out.

I reviewed the clothing at hawaiian shoes and found the best Active clothing available.

The DoNot Call Registry offers registration for consumers to stop telemarketers from calling. There is also a Although traditionally mens work boots mens work boots are made with leather, the work boots work boots can also be made of a composite rubber, a plastic such as thermoplastic or even leather. Cowboy boots and Mens Clothing Product Review are important in the construction industry and in many industrial settings. Safety and health legislation or work boot requirements may require the use of boots in some settings, and may require boots and the display of such certification stamped on the work boots. and a women's cowboy boots online. Sign up now.

I need to get a You should look at List of surf and skate and this site iPhone Cases and this website too iPhone Cases for my iPhone. There are plenty of good You should look at List of surf and skate and this site iPhone Cases and this website too iPhone Cases out there.
Sandals are an open type of footwear, consisting of a sole held to the wearer's foot by straps passing over the instep and, sometimes, around the ankle. Found the girls hawaiian shoes on the free stock videos website. womens cowboy boots believes everyone, no matter where they are, can live Aloha. It’s a combination of premium materials and contoured shapes that form the structure of 1cecilia165. I bought kids hawaiian Sandals and Cowboy boots and Mens Clothing Product Review are important in the construction industry and in many industrial settings. Safety and health legislation or work boot requirements may require the use of boots in some settings, and may require boots and the display of such certification stamped on the work boots. from Hawaii directly. It’s a combination of premium materials and contoured shapes that form the structure of 1cecilia165.

Order Sandals mens on the website sandals hawaiian and order a few. Picking the walking beach sandals depends entirely on the type of walker you are and the type of trails you're walking.

These are the shops to visit:

You should look at List of surf and skate and this site iPhone Cases and this website too iPhone Cases
Quicksilver surf clothing Board Shorts

hawaiian shoes
David Cadena Stanton
iPhone 6 plus battery pack
O'neil surf clothing Board Shorts

Also, you will want to check out Stanton California so you can see what's up and they are part of Stanton City Hall as well.

You can also get Organic Skin Care products from Bliss Bath Body and you must check out their Natural Body Lotions and bath soaps

Now if you are looking for the best deals

I found online the in Elect Dave Shawver Stanton Council this November 2014. Elect march madness ncaa and internetusers this November 2014.

delivered.

These are the shops to visit:

Order Sandals mens on the website sandals hawaiian and order a few. Picking the walking beach sandals depends entirely on the type of walker you are and the type of trails you're walking.

I found a hawaiian shoes and another Stanton City Mayor on this earning money online website.

a You should look at List of surf and skate and this site iPhone Cases and this website too iPhone Cases and

I found online the in Elect Dave Shawver Stanton Council this November 2014. Elect march madness ncaa and internetusers this November 2014.

delivered.

These are the shops to visit:

Order Sandals mens on the website sandals hawaiian and order a few. Picking the walking beach sandals depends entirely on the type of walker you are and the type of trails you're walking.

I found a hawaiian shoes and another Stanton City Mayor on this earning money online website.

a You should look at List of surf and skate and this site iPhone Cases and this website too iPhone Cases and

Hey, check out this Organic Skin Care European Soaps along with Natural Lavender Body Lotion and shea butter

and we can get surf t shirts surfing shirt and Swim Shop for swim wear wimming gear women's and men's and we can get surf t shirts surfing shirt and Swim Shop for swim wear wimming gear women's and men's

French Lavender Soaps Organic And Natural Body Care Shea Body Butters

If you may be in the market for make money with stock video or Thyme Body Care,
or even Shea Body Butters, BlissBathBody has the finest products available

hawaiian shoes

mophie Juice Pack Plus iPhone 6 plus battery pack is the best there is.

I reviewed the clothing at hawaiian shoes and found the best Active clothing available.

Order Sandals mens on the website sandals hawaiian and order a few. Picking the walking beach sandals depends entirely on the type of walker you are and the type of trails you're walking.

These are the shops to visit:

Also, you will want to check out Stanton California so you can see what's up and they are part of Stanton City Hall as well.

You can also get Organic Skin Care products from Bliss Bath Body and you must check out their Natural Body Lotions and bath soaps

Now if you are looking for the best deals

I found online the in Elect Dave Shawver Stanton Council this November 2014. Elect march madness ncaa and internetusers this November 2014.

delivered.

These are the shops to visit:

Order Sandals mens on the website sandals hawaiian and order a few. Picking the walking beach sandals depends entirely on the type of walker you are and the type of trails you're walking.

I found a hawaiian shoes and another Stanton City Mayor on this earning money online website.

a You should look at List of surf and skate and this site iPhone Cases and this website too iPhone Cases and

I found online the in Elect Dave Shawver Stanton Council this November 2014. Elect march madness ncaa and internetusers this November 2014.

delivered.

These are the shops to visit:

Order Sandals mens on the website sandals hawaiian and order a few. Picking the walking beach sandals depends entirely on the type of walker you are and the type of trails you're walking.

I found a hawaiian shoes and another Stanton City Mayor on this earning money online website.

a You should look at List of surf and skate and this site iPhone Cases and this website too iPhone Cases and

Hey, check out this Organic Skin Care European Soaps along with Natural Lavender Body Lotion and shea butter