Is 1255 Standard Pdf

[Custodio Groves]

Auniform method for calculating and measuring torque pulsations that occur during start-ing of synchronous motors is provided. Synchronous motors, as discussed in this guide, applies toall types of excited synchronous motors, including laminated or solid, salient or nonsalient ma-chines, as well as nonexcited synchronous-reluctance motors.

These standards have been replaced with a revised version of the standard, or by a compilation of the original active standard and all its existing amendments, corrigenda, and errata.

The UTF-8 encoding is the most appropriate encoding for interchange of Unicode, theuniversal coded character set. Therefore for new protocols and formats, as well asexisting formats deployed in new contexts, this specification requires (and defines) theUTF-8 encoding.

The other (legacy) encodings have been defined to some extent in the past. However,user agents have not always implemented them in the same way, have not always used thesame labels, and often differ in dealing with undefined and former proprietary areas ofencodings. This specification addresses those gaps so that new user agents do not have toreverse engineer encoding implementations and existing user agents can converge.

In particular, this specification defines all those encodings, their algorithms to gofrom bytes to scalar values and back, and their canonical names and identifying labels.This specification also defines an API to expose part of the encoding algorithms toJavaScript.

User agents have also significantly deviated from the labels listed in the IANA Character Sets registry.To stop spreading legacy encodings further, this specification is exhaustive about theaforementioned details and therefore has no need for the registry. In particular, thisspecification does not provide a mechanism for extending any aspect of encodings.

An I/O queue is a type of list with items of a particular type (i.e., bytes or scalar values). End-of-queue is a special item that can bepresent in I/O queues of any type and it signifies that there are no more items in the queue.

There are two ways to use an I/O queue: in immediate mode, to represent I/O data stored in memory, and in streaming mode, to represent data coming in from the network. Immediate queues have end-of-queue as their last item, whereas streaming queues need not have it, and so their read operation might block.

It is expected that streaming I/O queues will be created empty, and that new items will be pushed to it as data comes in from the network. When the underlying network stream closes, an end-of-queue item is to be pushed into the queue.

To restore an item otherthan end-of-queue to an I/O queue, perform the list prepend operation. To restore a list of items excluding end-of-queue to an I/O queue, insert thoseitems, in the given order, before the first item in the queue.

Each encoding has an associated decoder and most of them have anassociated encoder. Instances of decoders and encoders have a handler algorithm and might also have state. A handler algorithm takes an input I/O queue and an item, and returns finished, one or more items, error optionally with a code point, or continue.

Most legacy encodings make use of an index. An index is an ordered list of entries, each entry consisting of a pointer and acorresponding code point. Within an index pointers are unique and code points can beduplicated.

There is a non-normative visualization for each index other than index gb18030 ranges and index ISO-2022-JP katakana. index jis0208 also has an alternative Shift_JIS visualization. Additionally, there is visualization of the Basic Multilingual Plane coverage of each index other than index gb18030 ranges and index ISO-2022-JP katakana.

These hooks (as well as decode and encode) will block until the input I/O queue has been consumed in its entirety. In order to use the output tokens as they are pushed into the stream, callers are to invoke the hooks with an empty output I/O queue and read from it in parallel. Note that some care is needed when using UTF-8 decode without BOM or fail, as any error found during decoding will prevent the end-of-queue item from ever being pushed into the output I/O queue.

Standards are strongly discouraged from using decode, BOM sniff, and encode, except as needed for compatibility. Standards needing these legacy hooks will most likely also need to use get an encoding (to turn a label into an encoding) and get an output encoding (to turn an encoding into another encoding that is suitable to pass into encode).

For the extremely niche case of URL percent-encoding, custom encoder error handling is needed. The get an encoder and encode or fail algorithms are to be used for that. Other algorithms are not to be used directly.

For each of the rows in the table below, starting with the first one and going down, if BOM starts with the bytes given in the first column, then return the encoding given in the cell in the second column of that row. Otherwise, return null.

This is a legacy hook for URL percent-encoding. The caller will have to keep an encoder instance alive as the ISO-2022-JP encoder can be in two different states when returning an error. That also means that if the caller emits bytes to encode the error in some way, these have to be in the range 0x00 to 0x7F, inclusive, excluding 0x0E, 0x0F, 0x1B, 0x5C, and 0x7E. [URL]

The return value is either the number representing the code point that could not be encoded or null, if there was no error. When it returns non-null the caller will have to invoke it again, supplying the same encoder instance and a new output I/O queue.

This section uses terminology from Web IDL. Browser user agents must support this API. JavaScriptimplementations should support this API. Other user agents or programming languages are encouragedto use an API suitable to their needs, which might not be this one. [WEBIDL]

The following example uses the TextEncoder object to encode an array of strings into an ArrayBuffer. The result is a Uint8Array containing the number of strings (as a Uint32Array), followed by the length of the first string (as a Uint32Array), the UTF-8 encoded string data, the length of the second string (as a Uint32Array), the string data, and so on.

The following example decodes an ArrayBuffer containing data encoded in the format produced by the previous example, or an equivalent algorithm for encodings other than UTF-8, back into an array of strings.

Runs the UTF-8 encoder on source, stores the result of that operation into destination, and returns the progress made as an object wherein read is the number of converted code units of source and written is the number of bytes modified in destination.

The encodeInto() method can be used to encode a string into an existing ArrayBuffer object. Various details below are left as an exercise for the reader, but this demonstrates an approach one could take to use this method:

An encoding where each byte is either a single code point ornothing, is a single-byte encoding. Single-byte encodings share the decoder and encoder. Index single-byte,as referenced by the single-byte decoder and single-byte encoder, is defined by the following table, anddepends on the single-byte encoding in use. All but two single-byte encodings have aunique index.

Browsers are encouraged to not enable overriding the encoding of a resource. If such a feature isnonetheless present, browsers should not offer UTF-16BE/LE as an option, due to theaforementioned security issues. Browsers should also disable this feature if the resource wasdecoded using UTF-16BE/LE.

There have been a lot of people that have helped make encodings moreinteroperable over the years and thereby furthered the goals of thisstandard. Likewise many people have helped making this standard what it istoday.

Copyright WHATWG (Apple, Google, Mozilla, Microsoft). This work is licensed under a Creative Commons Attribution 4.0International License. To the extent portions of it are incorporated into source code, suchportions in the source code are licensed under the BSD 3-Clause License instead.

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