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Directory : /proc/1395/cwd/node_modules/get-orientation/
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Current File : /proc/1395/cwd/node_modules/get-orientation/browser.es5.js.map
{"version":3,"file":"browser.es5.js","sources":["base.ts","browser.ts"],"sourcesContent":["export enum Orientation {\n  TOP_LEFT = 1,         // Horizontal (Default)\n  TOP_RIGHT = 2,        // Mirror Horizontal\n  BOTTOM_RIGHT  = 3,    // Rotate 180\n  BOTTOM_LEFT = 4,      // Mirror vertical\n  LEFT_TOP = 5,         // Mirror horizontal and rotate 270 CW\n  RIGHT_TOP = 6,        // Rotate 90 CW\n  RIGHT_BOTTOM = 7,     // Mirror horizontal and rotate 90 CW\n  LEFT_BOTTOM = 8,      // Rotate 270 CW\n}\n","import { Orientation } from \"./base\";\n\nexport { Orientation };\n\nconst fileReaderMap = new WeakMap<Blob, FileReader>();\n\nexport async function getOrientation(input: ArrayBuffer | File | Blob) {\n  if (!(input instanceof ArrayBuffer || input instanceof Blob)) {\n    throw new TypeError(\"Unexpected input type\");\n  }\n\n  let offset = 0;\n  const totalBytes = getSize(input);\n\n  // Signature validation\n  {\n    const bufSignature = await readBytes(input, offset, 4);\n    offset += bufSignature.byteLength;\n\n    const signature = new DataView(bufSignature);\n    const head = signature.getUint16(0);\n    const tail = signature.getUint16(2);\n\n    // Check EXIF SOI first\n    if (head === 0xffd8) {\n      // This is EXIF structure. handle application markers\n      let bufMarker = bufSignature.slice(2);\n      do {\n        const marker = (new DataView(bufMarker)).getUint16(0);\n        if (marker === 0xffe1) { // APP1 Marker - EXIF, or Adobe XMP\n          // We must verify that marker segment to avoid conflict.\n          // Adobe XMP uses APP1 space too!\n          const bufSegmentHead = await readBytes(input, offset, 8);\n          const segmentHead = new DataView(bufSegmentHead);\n\n          const isEXIF = segmentHead.getUint16(2) === 0x4578\n            && segmentHead.getUint16(4) === 0x6966\n            && segmentHead.getUint16(6) === 0x0000;\n\n          if (isEXIF) {\n            offset += bufSegmentHead.byteLength;\n            break;\n          } else {\n            const segmentSize = segmentHead.getUint16(0);\n            offset += segmentSize;\n          }\n        } else if (0xffe0 <= marker && marker <= 0xffef) { // Other JPEG application markers\n          // e.g. APP0 Marker (JFIF), APP2 Marker (FlashFix Extension, ICC Color Profile), Photoshop IRB...\n          // @see http://www.ozhiker.com/electronics/pjmt/jpeg_info/app_segments.html\n\n          // Just skip. we don't need them\n          const bufSegmentSize = await readBytes(input, offset, 2);\n          offset += bufSegmentSize.byteLength;\n\n          const segmentSize = (new DataView(bufSegmentSize)).getUint16(0);\n          const remainingBytes = segmentSize - 2;\n          offset += remainingBytes;\n        } else { // If any other JPEG marker segment was found, skip entire bytes.\n          // Please refer Table B.1 – Marker code assignments from\n          // https://www.w3.org/Graphics/JPEG/itu-t81.pdf\n          return Orientation.TOP_LEFT;\n        }\n\n        bufMarker = await readBytes(input, offset, 2);\n        offset += bufMarker.byteLength;\n      } while (offset < totalBytes);\n    } else if ((head === 0x4949 && tail === 0x2a00) || (head === 0x4d4d && tail === 0x002a)) {\n      // yeah this is TIFF header\n      // reset offset cursor.\n      offset = 0;\n    } else { // This stream is not a JPEG file. Skip.\n      return Orientation.TOP_LEFT;\n    }\n  }\n\n  const bufTIFFHeader = await readBytes(input, offset, 8);\n\n  const tiffHeader = new DataView(bufTIFFHeader);\n  const isLittleEndian = tiffHeader.getUint16(0) === 0x4949;\n  const ifdOffset = tiffHeader.getUint32(4, isLittleEndian);\n\n  // move cursor to IFD block\n  offset += ifdOffset;\n\n  const bufFieldCount = await readBytes(input, offset, 2);\n  offset += bufFieldCount.byteLength;\n\n  let fieldCount = (new DataView(bufFieldCount)).getUint16(0, isLittleEndian);\n  while (fieldCount-- > 0) {\n    const bufField = await readBytes(input, offset, 12);\n    offset += bufField.byteLength;\n    const field = new DataView(bufField);\n\n    const tagId = field.getUint16(0, isLittleEndian);\n    if (tagId === 0x112) { // Orientation Tag\n      const value = (new DataView(bufField.slice(8, 12))).getUint16(0, isLittleEndian);\n\n      if (1 <= value && value <= 8) {\n        return value as Orientation;\n      } else {\n        throw new Error(\"Unexpected Orientation Value\");\n      }\n    }\n  }\n\n  return Orientation.TOP_LEFT;\n}\n\nfunction readBytes(input: Blob | ArrayBuffer, offset: number, size: number): Promise<ArrayBuffer> {\n  if (input instanceof Blob) {\n    return new Promise<ArrayBuffer>((resolve, reject) => {\n      let reader = fileReaderMap.get(input)!;\n\n      if (!reader) {\n        reader = new FileReader();\n        fileReaderMap.set(input, reader);\n      }\n\n      reader.onerror = (e) => {\n        reader.onerror = null;\n        reader.onload = null;\n        reject(e);\n      };\n\n      reader.onload = () => {\n        reader.onerror = null;\n        reader.onload = null;\n\n        resolve(reader.result as ArrayBuffer);\n      };\n\n      reader.readAsArrayBuffer(\n        input.slice(offset, offset + size),\n      );\n    });\n  }\n\n  return Promise.resolve(input.slice(offset, offset + size));\n}\n\nfunction getSize(input: Blob | ArrayBuffer) {\n  return input instanceof Blob 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