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All rights reserved.\n// Licensed to the Readium Foundation under one or more contributor license agreements.\n// Use of this source code is governed by a BSD-style license\n// that can be found in the LICENSE file exposed on Github (readium) in the project repository.\n// ==LICENSE-END==\n\nexport interface IRange { begin: number; end: number; }\n\nexport function parseRangeHeader(rangeHeader: undefined | string | string[]): IRange[] {\n let ranges: IRange[] = [];\n\n if (!rangeHeader) {\n return ranges;\n }\n\n let rHeader: string[];\n if (rangeHeader instanceof Array) {\n rHeader = rangeHeader as string[];\n } else { // typeof rangeHeader === \"string\"\n rHeader = [rangeHeader] as string[];\n }\n\n rHeader.forEach((rh) => {\n const arr = parseRangeHeader_(rh);\n ranges = ranges.concat(arr);\n });\n\n return ranges;\n}\n\nfunction parseRangeHeader_(rangeHeader: string): IRange[] {\n const ranges: IRange[] = [];\n const iEqual = rangeHeader.indexOf(\"=\");\n if (iEqual <= 0) {\n return ranges;\n }\n // const rangeType = rangeHeader.substr(0, iEqual); // assumes \"bytes\"\n const rangesStr = rangeHeader.substr(iEqual + 1); // multi-ranges?\n const rangeStrArray = rangesStr.split(\",\");\n rangeStrArray.forEach((rangeStr) => {\n // can be \"-END\", \"BEGIN-\" or \"BEGIN-END\"\n const beginEndArray = rangeStr.split(\"-\");\n const beginStr = beginEndArray[0];\n const endStr = beginEndArray[1];\n let begin = -1;\n if (beginStr && beginStr.length) {\n begin = parseInt(beginStr, 10);\n }\n let end = -1;\n if (endStr && endStr.length) {\n end = parseInt(endStr, 10);\n }\n\n const rangeObj: IRange = { begin, end };\n ranges.push(rangeObj);\n });\n\n return ranges;\n}\n\nexport function combineRanges(ranges: IRange[]): IRange[] {\n\n const orderedRanges = ranges\n .map((range, index) => {\n return {\n begin: range.begin,\n end: range.end,\n index,\n };\n })\n .sort((a, b) => {\n return a.begin - b.begin;\n });\n\n let j = 0;\n let i = 1;\n for (j = 0, i = 1; i < orderedRanges.length; i++) {\n const orderedRange = orderedRanges[i];\n const currentRange = orderedRanges[j];\n\n if (orderedRange.begin > currentRange.end + 1) {\n orderedRanges[++j] = orderedRange;\n } else if (orderedRange.end > currentRange.end) {\n currentRange.end = orderedRange.end;\n currentRange.index = Math.min(currentRange.index, orderedRange.index);\n }\n }\n\n orderedRanges.length = j + 1;\n\n return orderedRanges\n .sort((a, b) => {\n return a.index - b.index;\n })\n .map((range) => {\n return {\n begin: range.begin,\n end: range.end,\n };\n });\n}\n"]} |