{"version":3,"file":"js-binary-schema-parser-814ef804.js","sources":["../../../node_modules/js-binary-schema-parser/src/index.js","../../../node_modules/js-binary-schema-parser/src/parsers/uint8.js","../../../node_modules/js-binary-schema-parser/src/schemas/gif.js"],"sourcesContent":["export const parse = (stream, schema, result = {}, parent = result) => {\r\n  if (Array.isArray(schema)) {\r\n    schema.forEach(partSchema => parse(stream, partSchema, result, parent))\r\n  } else if (typeof schema === 'function') {\r\n    schema(stream, result, parent, parse)\r\n  } else {\r\n    const key = Object.keys(schema)[0]\r\n    if (Array.isArray(schema[key])) {\r\n      parent[key] = {}\r\n      parse(stream, schema[key], result, parent[key])\r\n    } else {\r\n      parent[key] = schema[key](stream, result, parent, parse)\r\n    }\r\n  }\r\n  return result\r\n}\r\n\r\nexport const conditional = (schema, conditionFunc) => (\r\n  stream,\r\n  result,\r\n  parent,\r\n  parse\r\n) => {\r\n  if (conditionFunc(stream, result, parent)) {\r\n    parse(stream, schema, result, parent)\r\n  }\r\n}\r\n\r\nexport const loop = (schema, continueFunc) => (\r\n  stream,\r\n  result,\r\n  parent,\r\n  parse\r\n) => {\r\n  const arr = []\r\n  let lastStreamPos = stream.pos;\r\n  while (continueFunc(stream, result, parent)) {\r\n    const newParent = {}\r\n    parse(stream, schema, result, newParent)\r\n    // cases when whole file is parsed but no termination is there and stream position is not getting updated as well\r\n    // it falls into infinite recursion, null check to avoid the same\r\n    if(stream.pos === lastStreamPos) {\r\n      break\r\n    }\r\n    lastStreamPos = stream.pos\r\n    arr.push(newParent)\r\n  }\r\n  return arr\r\n}\r\n","// Default stream and parsers for Uint8TypedArray data type\r\n\r\nexport const buildStream = uint8Data => ({\r\n  data: uint8Data,\r\n  pos: 0\r\n})\r\n\r\nexport const readByte = () => stream => {\r\n  return stream.data[stream.pos++]\r\n}\r\n\r\nexport const peekByte = (offset = 0) => stream => {\r\n  return stream.data[stream.pos + offset]\r\n}\r\n\r\nexport const readBytes = length => stream => {\r\n  return stream.data.subarray(stream.pos, (stream.pos += length))\r\n}\r\n\r\nexport const peekBytes = length => stream => {\r\n  return stream.data.subarray(stream.pos, stream.pos + length)\r\n}\r\n\r\nexport const readString = length => stream => {\r\n  return Array.from(readBytes(length)(stream))\r\n    .map(value => String.fromCharCode(value))\r\n    .join('')\r\n}\r\n\r\nexport const readUnsigned = littleEndian => stream => {\r\n  const bytes = readBytes(2)(stream)\r\n  return littleEndian ? (bytes[1] << 8) + bytes[0] : (bytes[0] << 8) + bytes[1]\r\n}\r\n\r\nexport const readArray = (byteSize, totalOrFunc) => (\r\n  stream,\r\n  result,\r\n  parent\r\n) => {\r\n  const total =\r\n    typeof totalOrFunc === 'function'\r\n      ? totalOrFunc(stream, result, parent)\r\n      : totalOrFunc\r\n\r\n  const parser = readBytes(byteSize)\r\n  const arr = new Array(total)\r\n  for (var i = 0; i < total; i++) {\r\n    arr[i] = parser(stream)\r\n  }\r\n  return arr\r\n}\r\n\r\nconst subBitsTotal = (bits, startIndex, length) => {\r\n  var result = 0\r\n  for (var i = 0; i < length; i++) {\r\n    result += bits[startIndex + i] && 2 ** (length - i - 1)\r\n  }\r\n  return result\r\n}\r\n\r\nexport const readBits = schema => stream => {\r\n  const byte = readByte()(stream)\r\n  // convert the byte to bit array\r\n  const bits = new Array(8)\r\n  for (var i = 0; i < 8; i++) {\r\n    bits[7 - i] = !!(byte & (1 << i))\r\n  }\r\n  // convert the bit array to values based on the schema\r\n  return Object.keys(schema).reduce((res, key) => {\r\n    const def = schema[key]\r\n    if (def.length) {\r\n      res[key] = subBitsTotal(bits, def.index, def.length)\r\n    } else {\r\n      res[key] = bits[def.index]\r\n    }\r\n    return res\r\n  }, {})\r\n}\r\n","import { conditional, loop } from '../'\r\nimport {\r\n  readByte,\r\n  peekByte,\r\n  readBytes,\r\n  peekBytes,\r\n  readString,\r\n  readUnsigned,\r\n  readArray,\r\n  readBits,\r\n} from '../parsers/uint8'\r\n\r\n// a set of 0x00 terminated subblocks\r\nvar subBlocksSchema = {\r\n  blocks: (stream) => {\r\n    const terminator = 0x00\r\n    const chunks = []\r\n    const streamSize = stream.data.length\r\n    var total = 0\r\n    for (\r\n      var size = readByte()(stream);\r\n      size !== terminator;\r\n      size = readByte()(stream)\r\n    ) {\r\n      // size becomes undefined for some case when file is corrupted and  terminator is not proper \r\n      // null check to avoid recursion\r\n      if(!size) break;\r\n      // catch corrupted files with no terminator\r\n      if (stream.pos + size >= streamSize) {\r\n        const availableSize = streamSize - stream.pos\r\n        chunks.push(readBytes(availableSize)(stream))\r\n        total += availableSize\r\n        break\r\n      }\r\n      chunks.push(readBytes(size)(stream))\r\n      total += size\r\n    }\r\n    const result = new Uint8Array(total)\r\n    var offset = 0\r\n    for (var i = 0; i < chunks.length; i++) {\r\n      result.set(chunks[i], offset)\r\n      offset += chunks[i].length\r\n    }\r\n    return result\r\n  },\r\n}\r\n\r\n// global control extension\r\nconst gceSchema = conditional(\r\n  {\r\n    gce: [\r\n      { codes: readBytes(2) },\r\n      { byteSize: readByte() },\r\n      {\r\n        extras: readBits({\r\n          future: { index: 0, length: 3 },\r\n          disposal: { index: 3, length: 3 },\r\n          userInput: { index: 6 },\r\n          transparentColorGiven: { index: 7 },\r\n        }),\r\n      },\r\n      { delay: readUnsigned(true) },\r\n      { transparentColorIndex: readByte() },\r\n      { terminator: readByte() },\r\n    ],\r\n  },\r\n  (stream) => {\r\n    var codes = peekBytes(2)(stream)\r\n    return codes[0] === 0x21 && codes[1] === 0xf9\r\n  }\r\n)\r\n\r\n// image pipeline block\r\nconst imageSchema = conditional(\r\n  {\r\n    image: [\r\n      { code: readByte() },\r\n      {\r\n        descriptor: [\r\n          { left: readUnsigned(true) },\r\n          { top: readUnsigned(true) },\r\n          { width: readUnsigned(true) },\r\n          { height: readUnsigned(true) },\r\n          {\r\n            lct: readBits({\r\n              exists: { index: 0 },\r\n              interlaced: { index: 1 },\r\n              sort: { index: 2 },\r\n              future: { index: 3, length: 2 },\r\n              size: { index: 5, length: 3 },\r\n            }),\r\n          },\r\n        ],\r\n      },\r\n      conditional(\r\n        {\r\n          lct: readArray(3, (stream, result, parent) => {\r\n            return Math.pow(2, parent.descriptor.lct.size + 1)\r\n          }),\r\n        },\r\n        (stream, result, parent) => {\r\n          return parent.descriptor.lct.exists\r\n        }\r\n      ),\r\n      { data: [{ minCodeSize: readByte() }, subBlocksSchema] },\r\n    ],\r\n  },\r\n  (stream) => {\r\n    return peekByte()(stream) === 0x2c\r\n  }\r\n)\r\n\r\n// plain text block\r\nconst textSchema = conditional(\r\n  {\r\n    text: [\r\n      { codes: readBytes(2) },\r\n      { blockSize: readByte() },\r\n      {\r\n        preData: (stream, result, parent) =>\r\n          readBytes(parent.text.blockSize)(stream),\r\n      },\r\n      subBlocksSchema,\r\n    ],\r\n  },\r\n  (stream) => {\r\n    var codes = peekBytes(2)(stream)\r\n    return codes[0] === 0x21 && codes[1] === 0x01\r\n  }\r\n)\r\n\r\n// application block\r\nconst applicationSchema = conditional(\r\n  {\r\n    application: [\r\n      { codes: readBytes(2) },\r\n      { blockSize: readByte() },\r\n      { id: (stream, result, parent) => readString(parent.blockSize)(stream) },\r\n      subBlocksSchema,\r\n    ],\r\n  },\r\n  (stream) => {\r\n    var codes = peekBytes(2)(stream)\r\n    return codes[0] === 0x21 && codes[1] === 0xff\r\n  }\r\n)\r\n\r\n// comment block\r\nconst commentSchema = conditional(\r\n  {\r\n    comment: [{ codes: readBytes(2) }, subBlocksSchema],\r\n  },\r\n  (stream) => {\r\n    var codes = peekBytes(2)(stream)\r\n    return codes[0] === 0x21 && codes[1] === 0xfe\r\n  }\r\n)\r\n\r\nconst schema = [\r\n  { header: [{ signature: readString(3) }, { version: readString(3) }] },\r\n  {\r\n    lsd: [\r\n      { width: readUnsigned(true) },\r\n      { height: readUnsigned(true) },\r\n      {\r\n        gct: readBits({\r\n          exists: { index: 0 },\r\n          resolution: { index: 1, length: 3 },\r\n          sort: { index: 4 },\r\n          size: { index: 5, length: 3 },\r\n        }),\r\n      },\r\n      { backgroundColorIndex: readByte() },\r\n      { pixelAspectRatio: readByte() },\r\n    ],\r\n  },\r\n  conditional(\r\n    {\r\n      gct: readArray(3, (stream, result) =>\r\n        Math.pow(2, result.lsd.gct.size + 1)\r\n      ),\r\n    },\r\n    (stream, result) => result.lsd.gct.exists\r\n  ),\r\n  // content frames\r\n  {\r\n    frames: loop(\r\n      [gceSchema, applicationSchema, commentSchema, imageSchema, textSchema],\r\n      (stream) => {\r\n        var nextCode = peekByte()(stream)\r\n        // rather than check for a terminator, we should check for the existence\r\n        // of an ext or image block to avoid infinite loops\r\n        //var terminator = 0x3B;\r\n        //return nextCode !== terminator;\r\n        return nextCode === 0x21 || nextCode === 0x2c\r\n      }\r\n    ),\r\n  },\r\n]\r\n\r\nexport default 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