49 строки
1.2 KiB
TypeScript
49 строки
1.2 KiB
TypeScript
// tslint:disable:max-line-length
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/**
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* Range for Service Operations.
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* @see https://docs.microsoft.com/en-us/rest/api/storageservices/specifying-the-range-header-for-file-service-operations
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*
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* @export
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* @interface IRange
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*/
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export interface IRange {
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/**
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* StartByte, larger than or equal 0.
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*
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* @type {string}
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* @memberof IRange
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*/
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offset: number;
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/**
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* Optional. Count of bytes, larger than 0.
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* If not provided, will return bytes from offset to the end.
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*
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* @type {string}
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* @memberof IRange
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*/
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count?: number;
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}
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/**
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* Generate a range string. For example:
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*
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* "bytes=255-" or "bytes=0-511"
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*
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* @export
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* @param {IRange} iRange
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* @returns {string}
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*/
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export function rangeToString(iRange: IRange): string {
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if (iRange.offset < 0) {
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throw new RangeError(`IRange.offset cannot be smaller than 0.`);
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}
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if (iRange.count && iRange.count <= 0) {
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throw new RangeError(
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`IRange.count must be larger than 0. Leave it undefined if you want a range from offset to the end.`
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);
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}
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return iRange.count
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? `bytes=${iRange.offset}-${iRange.offset + iRange.count - 1}`
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: `bytes=${iRange.offset}-`;
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}
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