header-range-parser

Header • Range • Parser

Range header field parser. Fork of a̶b̶a̶n̶d̶o̶n̶e̶d̶ range-parser.

Installation

npm install header-range-parser

API

const {
  ERROR_INVALID_ARGUMENT,
  ERROR_STRING_IS_NOT_HEADER,
  ERROR_UNSATISFIABLE_RESULT,
  parseRange,
} = require("header-range-parser");

import {
  ERROR_INVALID_ARGUMENT,
  ERROR_STRING_IS_NOT_HEADER,
  ERROR_UNSATISFIABLE_RESULT,
  ResultInvalid,
  ResultUnsatisfiable,
  ResultWrongArgument,
  parseRange,
} from "header-range-parser";

parseRange(size, header, options)

import {
  Result, Ranges, parseRange, Options,
} from "header-range-parser";

declare function parseRange(
  size: number, header: string, options?: Options,
): Ranges | Result;

Parameter	Type	Description
size	number	Required. Size in bytes.
header	string	Required. String containing header.
options	object	Optional options: combine (bool), throwError (bool).

Parse the given header string where size is the size of the selected representation that is to be partitioned into sub-ranges. An array of sub-ranges will be returned or negative numbers indicating an error parsing.

• -1 or ERROR_UNSATISFIABLE_RESULT or ResultUnsatisfiable signals an unsatisfiable range

• -2 or ERROR_STRING_IS_NOT_HEADER or ResultInvalid signals a malformed header string

• -3 or ERROR_INVALID_ARGUMENT or ResultWrongArgument invalid parameters

// parse header from request
const subRanges = parseRange(
  size,
  request.headers.range,
);

// the type of the subranges
if (subRanges.type === "bytes") {
  // the ranges
  subRanges.forEach((range) => {
    // do something
    // with range.start
    // and range.end
  });
}

Options

These properties are accepted in the options object.

combine

Specifies if overlapping and adjacent sub-ranges should be combined, defaults to false.

When true, ranges will be combined and returned as if they were specified that way in the header.

throwError

Throw or suppress errors. Defaults to true.

parseRange(
  100,
  "bytes=50-55,0-10,5-10,56-60",
  {
    combine: true,
    throwError: false,
  });
//  [
//    { start: 0,  end: 10 },
//    { start: 50, end: 60 }
//  ]