diff --git a/README.md b/README.md
index 4e397e9..3749c8b 100644
--- a/README.md
+++ b/README.md
@@ -169,7 +169,7 @@ You can extend support for other compression codecs using the `compressors` opti
 import { parquetRead } from 'hyparquet'
 import { gunzipSync } from 'zlib'
 
-parquetRead({ file, compressors: {
+await parquetRead({ file, compressors: {
   GZIP: (input, output) => output.set(gunzipSync(input)), // add gzip support
 }})
 ```
@@ -199,7 +199,7 @@ To use hysnappy for faster parsing of large parquet files, override the `SNAPPY`
 import { parquetRead } from 'hyparquet'
 import { snappyUncompressor } from 'hysnappy'
 
-parquetRead({ file, compressors: {
+await parquetRead({ file, compressors: {
   SNAPPY: snappyUncompressor(),
 }})
 ```
diff --git a/src/byteStreamSplit.js b/src/byteStreamSplit.js
new file mode 100644
index 0000000..c308fce
--- /dev/null
+++ b/src/byteStreamSplit.js
@@ -0,0 +1,14 @@
+/**
+ * @param {import('./types.d.ts').DataReader} reader
+ * @param {number} nValues
+ * @param {Float32Array | Float64Array} output
+ */
+export function byteStreamSplit(reader, nValues, output) {
+  const byteWidth = output instanceof Float32Array ? 4 : 8
+  const bytes = new Uint8Array(output.buffer)
+  for (let b = 0; b < byteWidth; b++) {
+    for (let i = 0; i < nValues; i++) {
+      bytes[i * byteWidth + b] = reader.view.getUint8(reader.offset++)
+    }
+  }
+}
diff --git a/src/column.js b/src/column.js
index 408a17b..c79542f 100644
--- a/src/column.js
+++ b/src/column.js
@@ -143,8 +143,7 @@ function dereferenceDictionary(dictionary, dataPage) {
  * @param {ColumnMetaData} columnMetadata
  * @returns {number} byte offset
  */
-export function getColumnOffset(columnMetadata) {
-  const { dictionary_page_offset, data_page_offset } = columnMetadata
+export function getColumnOffset({ dictionary_page_offset, data_page_offset }) {
   let columnOffset = dictionary_page_offset
   if (dictionary_page_offset === undefined || data_page_offset < dictionary_page_offset) {
     columnOffset = data_page_offset
@@ -160,7 +159,7 @@ export function getColumnOffset(columnMetadata) {
  * @returns {Uint8Array}
  */
 export function decompressPage(compressedBytes, uncompressed_page_size, codec, compressors) {
-  /** @type {Uint8Array | undefined} */
+  /** @type {Uint8Array} */
   let page
   const customDecompressor = compressors?.[codec]
   if (codec === 'UNCOMPRESSED') {
diff --git a/src/datapage.js b/src/datapage.js
index a3b99f9..eaa197c 100644
--- a/src/datapage.js
+++ b/src/datapage.js
@@ -1,3 +1,4 @@
+import { byteStreamSplit } from './byteStreamSplit.js'
 import { readRleBitPackedHybrid, widthFromMaxInt } from './encoding.js'
 import { readPlain } from './plain.js'
 import { getMaxDefinitionLevel, getMaxRepetitionLevel, isRequired } from './schema.js'
@@ -16,11 +17,11 @@ import { getMaxDefinitionLevel, getMaxRepetitionLevel, isRequired } from './sche
  * @param {ColumnMetaData} columnMetadata
  * @returns {DataPage} definition levels, repetition levels, and array of values
  */
-export function readDataPage(bytes, daph, schemaPath, columnMetadata) {
+export function readDataPage(bytes, daph, schemaPath, { type }) {
   const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength)
   const reader = { view, offset: 0 }
   /** @type {DecodedArray} */
-  let dataPage = []
+  let dataPage
 
   // repetition and definition levels
   const repetitionLevels = readRepetitionLevels(reader, daph, schemaPath)
@@ -30,26 +31,25 @@ export function readDataPage(bytes, daph, schemaPath, columnMetadata) {
   const nValues = daph.num_values - numNulls
   if (daph.encoding === 'PLAIN') {
     const { type_length } = schemaPath[schemaPath.length - 1].element
-    dataPage = readPlain(reader, columnMetadata.type, nValues, type_length)
+    dataPage = readPlain(reader, type, nValues, type_length)
   } else if (
     daph.encoding === 'PLAIN_DICTIONARY' ||
     daph.encoding === 'RLE_DICTIONARY' ||
     daph.encoding === 'RLE'
   ) {
-    // bit width is stored as single byte
-    let bitWidth = 1
     // TODO: RLE encoding uses bitWidth = schemaElement.type_length
-    if (columnMetadata.type !== 'BOOLEAN') {
-      bitWidth = view.getUint8(reader.offset)
-      reader.offset++
-    }
+    const bitWidth = type === 'BOOLEAN' ? 1 : view.getUint8(reader.offset++)
     if (bitWidth) {
       dataPage = new Array(nValues)
       readRleBitPackedHybrid(reader, bitWidth, view.byteLength - reader.offset, dataPage)
     } else {
-      // nval zeros
-      dataPage = new Array(nValues).fill(0)
+      dataPage = new Uint8Array(nValues) // nValue zeroes
     }
+  } else if (daph.encoding === 'BYTE_STREAM_SPLIT') {
+    if (type === 'FLOAT') dataPage = new Float32Array(nValues)
+    else if (type === 'DOUBLE') dataPage = new Float64Array(nValues)
+    else throw new Error(`parquet byte_stream_split unsupported type: ${type}`)
+    byteStreamSplit(reader, nValues, dataPage)
   } else {
     throw new Error(`parquet unsupported encoding: ${daph.encoding}`)
   }
diff --git a/src/datapageV2.js b/src/datapageV2.js
index c7fcaa6..33bcea9 100644
--- a/src/datapageV2.js
+++ b/src/datapageV2.js
@@ -1,3 +1,4 @@
+import { byteStreamSplit } from './byteStreamSplit.js'
 import { decompressPage } from './column.js'
 import { deltaBinaryUnpack, deltaByteArray, deltaLengthByteArray } from './delta.js'
 import { readRleBitPackedHybrid, widthFromMaxInt } from './encoding.js'
@@ -22,7 +23,7 @@ import { getMaxDefinitionLevel, getMaxRepetitionLevel } from './schema.js'
 export function readDataPageV2(compressedBytes, ph, schemaPath, columnMetadata, compressors) {
   const view = new DataView(compressedBytes.buffer, compressedBytes.byteOffset, compressedBytes.byteLength)
   const reader = { view, offset: 0 }
-
+  const { codec, type } = columnMetadata
   const daph2 = ph.data_page_header_v2
   if (!daph2) throw new Error('parquet data page header v2 is undefined')
 
@@ -38,9 +39,7 @@ export function readDataPageV2(compressedBytes, ph, schemaPath, columnMetadata,
   const uncompressedPageSize = ph.uncompressed_page_size - daph2.definition_levels_byte_length - daph2.repetition_levels_byte_length
 
   let page = compressedBytes.subarray(reader.offset)
-  if (daph2.is_compressed && columnMetadata.codec !== 'UNCOMPRESSED') {
-    page = decompressPage(page, uncompressedPageSize, columnMetadata.codec, compressors)
-  }
+  page = decompressPage(page, uncompressedPageSize, codec, compressors)
   const pageView = new DataView(page.buffer, page.byteOffset, page.byteLength)
   const pageReader = { view: pageView, offset: 0 }
 
@@ -50,7 +49,7 @@ export function readDataPageV2(compressedBytes, ph, schemaPath, columnMetadata,
   const nValues = daph2.num_values - daph2.num_nulls
   if (daph2.encoding === 'PLAIN') {
     const { type_length } = schemaPath[schemaPath.length - 1].element
-    dataPage = readPlain(pageReader, columnMetadata.type, nValues, type_length)
+    dataPage = readPlain(pageReader, type, nValues, type_length)
   } else if (daph2.encoding === 'RLE') {
     pageReader.offset = 4
     dataPage = new Array(nValues)
@@ -64,7 +63,7 @@ export function readDataPageV2(compressedBytes, ph, schemaPath, columnMetadata,
     dataPage = new Array(nValues)
     readRleBitPackedHybrid(pageReader, bitWidth, uncompressedPageSize, dataPage)
   } else if (daph2.encoding === 'DELTA_BINARY_PACKED') {
-    const int32 = columnMetadata.type === 'INT32'
+    const int32 = type === 'INT32'
     dataPage = int32 ? new Int32Array(nValues) : new BigInt64Array(nValues)
     deltaBinaryUnpack(pageReader, nValues, dataPage)
   } else if (daph2.encoding === 'DELTA_LENGTH_BYTE_ARRAY') {
@@ -73,6 +72,11 @@ export function readDataPageV2(compressedBytes, ph, schemaPath, columnMetadata,
   } else if (daph2.encoding === 'DELTA_BYTE_ARRAY') {
     dataPage = new Array(nValues)
     deltaByteArray(pageReader, nValues, dataPage)
+  } else if (daph2.encoding === 'BYTE_STREAM_SPLIT') {
+    if (type === 'FLOAT') dataPage = new Float32Array(nValues)
+    else if (type === 'DOUBLE') dataPage = new Float64Array(nValues)
+    else throw new Error(`parquet byte_stream_split unsupported type: ${type}`)
+    byteStreamSplit(pageReader, nValues, dataPage)
   } else {
     throw new Error(`parquet unsupported encoding: ${daph2.encoding}`)
   }
diff --git a/src/encoding.js b/src/encoding.js
index 67c1ee8..4fdad0f 100644
--- a/src/encoding.js
+++ b/src/encoding.js
@@ -24,22 +24,20 @@ export function widthFromMaxInt(value) {
  */
 export function readRleBitPackedHybrid(reader, width, length, values) {
   if (!length) {
-    length = reader.view.getInt32(reader.offset, true)
+    length = reader.view.getUint32(reader.offset, true)
     reader.offset += 4
-    if (length < 0) throw new Error(`parquet invalid rle/bitpack length ${length}`)
   }
   let seen = 0
-  const startOffset = reader.offset
-  while (reader.offset - startOffset < length && seen < values.length) {
+  while (seen < values.length) {
     const header = readVarInt(reader)
-    if ((header & 1) === 0) {
+    if (header & 1) {
+      // bit-packed
+      seen = readBitPacked(reader, header, width, values, seen)
+    } else {
       // rle
       const count = header >>> 1
       readRle(reader, count, width, values, seen)
       seen += count
-    } else {
-      // bit-packed
-      seen = readBitPacked(reader, header, width, values, seen)
     }
   }
 }
diff --git a/test/encoding.test.js b/test/encoding.test.js
index 01e62f0..d05b3db 100644
--- a/test/encoding.test.js
+++ b/test/encoding.test.js
@@ -98,17 +98,6 @@ describe('readRleBitPackedHybrid', () => {
     expect(() => readRleBitPackedHybrid(reader, 1, 3, values))
       .toThrow('parquet bitpack offset 1 out of range')
   })
-
-  it('throws for negative implicit length', () => {
-    const buffer = new ArrayBuffer(4)
-    const view = new DataView(buffer)
-    view.setInt32(0, -1, true) // negative length
-    const reader = { view, offset: 0 }
-
-    const values = new Array(3)
-    expect(() => readRleBitPackedHybrid(reader, 1, 0, values))
-      .toThrow('parquet invalid rle/bitpack length -1')
-  })
 })
 
 describe('widthFromMaxInt', () => {
diff --git a/test/files/byte_stream_split.zstd.json b/test/files/byte_stream_split.zstd.json
new file mode 100644
index 0000000..fb7155d
--- /dev/null
+++ b/test/files/byte_stream_split.zstd.json
@@ -0,0 +1,302 @@
+[
+  [1.764052391052246, -1.3065268517353166],
+  [0.40015721321105957, 1.658130679618188],
+  [0.978738009929657, -0.11816404512856976],
+  [2.2408931255340576, -0.6801782039968504],
+  [1.8675580024719238, 0.6663830820319143],
+  [-0.9772778749465942, -0.4607197873885533],
+  [0.9500884413719177, -1.3342584714027534],
+  [-0.15135720372200012, -1.3467175057975553],
+  [-0.10321885347366333, 0.6937731526901325],
+  [0.4105985164642334, -0.1595734381462669],
+  [0.14404356479644775, -0.13370155966843916],
+  [1.4542734622955322, 1.0777438059762627],
+  [0.7610377073287964, -1.1268258087567435],
+  [0.12167501449584961, -0.7306777528648248],
+  [0.44386324286460876, -0.38487980918127546],
+  [0.3336743414402008, 0.094351589317074],
+  [1.4940791130065918, -0.042171451290578935],
+  [-0.2051582634449005, -0.2868871923899076],
+  [0.3130677044391632, -0.0616264020956474],
+  [-0.8540957570075989, -0.10730527629117469],
+  [-2.5529897212982178, -0.7196043885517929],
+  [0.653618574142456, -0.8129929885540773],
+  [0.8644362092018127, 0.2745163577239395],
+  [-0.7421650290489197, -0.8909150829955279],
+  [2.269754648208618, -1.1573552591908536],
+  [-1.4543657302856445, -0.3122922511256933],
+  [0.04575851559638977, -0.1576670161638159],
+  [-0.18718385696411133, 2.2567234972982093],
+  [1.5327792167663574, -0.7047002758562337],
+  [1.4693588018417358, 0.9432607249694948],
+  [0.154947429895401, 0.7471883342046318],
+  [0.37816253304481506, -1.188944955203736],
+  [-0.8877857327461243, 0.7732529774025997],
+  [-1.980796456336975, -1.1838806401933177],
+  [-0.34791216254234314, -2.659172237996741],
+  [0.15634897351264954, 0.6063195243593807],
+  [1.2302906513214111, -1.7558905834377194],
+  [1.202379822731018, 0.45093446180591484],
+  [-0.38732680678367615, -0.6840108977372166],
+  [-0.302302747964859, 1.6595507961898721],
+  [-1.0485529899597168, 1.068509399316009],
+  [-1.420017957687378, -0.45338580385138766],
+  [-1.7062702178955078, -0.6878376110286823],
+  [1.950775384902954, -1.2140774030941206],
+  [-0.5096521973609924, -0.4409226322925914],
+  [-0.4380742907524109, -0.2803554951845091],
+  [-1.2527953386306763, -0.3646935443916854],
+  [0.7774903774261475, 0.15670385527236397],
+  [-1.6138978004455566, 0.5785214977288784],
+  [-0.21274028718471527, 0.349654456993174],
+  [-0.8954665660858154, -0.764143923906443],
+  [0.38690251111984253, -1.4377914738015785],
+  [-0.5108051300048828, 1.3645318481024713],
+  [-1.18063223361969, -0.6894491845499376],
+  [-0.02818222902715206, -0.6522935999350191],
+  [0.4283318817615509, -0.5211893123011109],
+  [0.06651721894741058, -1.8430695501566485],
+  [0.30247190594673157, -0.4779740040404867],
+  [-0.6343221068382263, -0.47965581400794766],
+  [-0.3627411723136902, 0.6203582983435125],
+  [-0.6724604368209839, 0.698457149107336],
+  [-0.35955315828323364, 0.00377088908626934],
+  [-0.8131462931632996, 0.9318483741143037],
+  [-1.7262825965881348, 0.339964983801262],
+  [0.17742614448070526, -0.01568211160255477],
+  [-0.4017809331417084, 0.16092816829822298],
+  [-1.630198359489441, -0.19065349358139935],
+  [0.46278226375579834, -0.3948495140334503],
+  [-0.9072983860969543, -0.26773353689396645],
+  [0.05194539576768875, -1.1280113314700069],
+  [0.7290905714035034, 0.280441705316296],
+  [0.12898291647434235, -0.9931236109295807],
+  [1.1394007205963135, 0.8416312640736364],
+  [-1.234825849533081, -0.24945858016094885],
+  [0.4023416340351105, 0.04949498165009074],
+  [-0.6848101019859314, 0.49383677628095635],
+  [-0.8707971572875977, 0.6433144650629279],
+  [-0.5788496732711792, -1.5706234086334527],
+  [-0.3115525245666504, -0.20690367616397173],
+  [0.056165341287851334, 0.8801789120807822],
+  [-1.1651498079299927, -1.6981058194322545],
+  [0.9008265137672424, 0.3872804753950634],
+  [0.4656624495983124, -2.2555642294021894],
+  [-1.5362436771392822, -1.0225068436356035],
+  [1.4882521629333496, 0.0386305518401881],
+  [1.895889163017273, -1.6567151023219537],
+  [1.1787796020507812, -0.9855107376841507],
+  [-0.1799248307943344, -1.4718350074635869],
+  [-1.0707526206970215, 1.6481349322075596],
+  [1.0544517040252686, 0.16422775548733395],
+  [-0.4031769335269928, 0.5672902778526694],
+  [1.222445011138916, -0.2226751005151545],
+  [0.2082749754190445, -0.35343174875719907],
+  [0.9766390323638916, -1.6164741886510325],
+  [0.3563663959503174, -0.2918373627478628],
+  [0.7065731883049011, -0.7614922118116233],
+  [0.01050002034753561, 0.8579239242923363],
+  [1.7858705520629883, 1.1411018666575734],
+  [0.12691208720207214, 1.4665787155741776],
+  [0.4019893705844879, 0.852551939461232],
+  [1.8831506967544556, -0.5986539369229861],
+  [-1.3477590084075928, -1.1158969859603944],
+  [-1.2704850435256958, 0.7666631816450861],
+  [0.969396710395813, 0.3562928174722889],
+  [-1.1731233596801758, -1.7685384506770307],
+  [1.9436211585998535, 0.35548179274376907],
+  [-0.4136189818382263, 0.8145198224878663],
+  [-0.747454822063446, 0.058925589181629955],
+  [1.922942042350769, -0.18505367100934153],
+  [1.4805147647857666, -0.8076484876163557],
+  [1.8675589561462402, -1.4465346995633879],
+  [0.9060446619987488, 0.8002979493400275],
+  [-0.8612256646156311, -0.3091144447717088],
+  [1.910064935684204, -0.23346666154369272],
+  [-0.26800337433815, 1.7327211869191332],
+  [0.8024563789367676, 0.6845011068591904],
+  [0.9472519755363464, 0.3708250012811021],
+  [-0.15501008927822113, 0.14206180518723566],
+  [0.6140793561935425, 1.5199948607657727],
+  [0.922206699848175, 1.7195893074161945],
+  [0.37642553448677063, 0.9295051114795281],
+  [-1.0994007587432861, 0.5822245913979243],
+  [0.29823818802833557, -2.0946030712061448],
+  [1.3263858556747437, 0.12372191423350658],
+  [-0.694567859172821, -0.130106954193704],
+  [-0.14963454008102417, 0.09395322938556872],
+  [-0.4351535439491272, 0.9430460873225178],
+  [1.8492637872695923, -2.7396771671895563],
+  [0.6722947359085083, -0.5693120534701851],
+  [0.40746182203292847, 0.26990435494076137],
+  [-0.7699160575866699, -0.4668455460527625],
+  [0.5392491817474365, -1.4169061131262595],
+  [-0.6743326783180237, 0.8689634868967954],
+  [0.0318305566906929, 0.27687190584612803],
+  [-0.6358460783958435, -0.9711045704444846],
+  [0.676433265209198, 0.3148172045158238],
+  [0.5765908360481262, 0.8215857120497958],
+  [-0.20829875767230988, 0.005292646299360854],
+  [0.39600670337677, 0.8005648034309968],
+  [-1.0930615663528442, 0.07826017516166135],
+  [-1.4912575483322144, -0.39522898265435435],
+  [0.43939170241355896, -1.159420516399913],
+  [0.16667349636554718, -0.08593076697161273],
+  [0.6350314617156982, 0.19429293804577166],
+  [2.3831448554992676, 0.8758327615873309],
+  [0.9444794654846191, -0.11510746848722672],
+  [-0.9128222465515137, 0.4574156062209908],
+  [1.117016315460205, -0.9646120137337284],
+  [-1.31590735912323, -0.7826291558275251],
+  [-0.46158459782600403, -0.11038929902688775],
+  [-0.06824160367250443, -1.0546284639850139],
+  [1.7133426666259766, 0.8202478373246812],
+  [-0.7447548508644104, 0.4631303293186071],
+  [-0.8264385461807251, 0.2790957643924534],
+  [-0.09845252335071564, 0.33890412521594454],
+  [-0.6634783148765564, 2.0210435614847975],
+  [1.1266359090805054, -0.46886418796679563],
+  [-1.0799314975738525, -2.201441285500558],
+  [-1.1474686861038208, 0.1993001968964652],
+  [-0.43782004714012146, -0.050603540961665895],
+  [-0.49803245067596436, -0.5175190425104033],
+  [1.9295320510864258, -0.9788298593587699],
+  [0.9494208097457886, -0.43918952180214793],
+  [0.08755124360322952, 0.18133842921782128],
+  [-1.225435495376587, -0.5028167006425383],
+  [0.8443629741668701, 2.4124536795437486],
+  [-1.0002152919769287, -0.960504381633148],
+  [-1.5447710752487183, -0.7931173627076716],
+  [1.1880297660827637, -2.2886200400145285],
+  [0.31694260239601135, 0.251484415021537],
+  [0.9208588004112244, -2.01640662779976],
+  [0.31872764229774475, -0.5394546333745014],
+  [0.8568305969238281, -0.27567053456055696],
+  [-0.6510255932807922, -0.7097279658468882],
+  [-1.034242868423462, 1.738872677454511],
+  [0.6815944910049438, 0.9943943913154989],
+  [-0.8034096360206604, 1.3191368763015756],
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diff --git a/test/files/byte_stream_split.zstd.metadata.json b/test/files/byte_stream_split.zstd.metadata.json
new file mode 100644
index 0000000..48df755
--- /dev/null
+++ b/test/files/byte_stream_split.zstd.metadata.json
@@ -0,0 +1,104 @@
+{
+  "version": 2,
+  "schema": [
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+      "name": "schema",
+      "num_children": 2
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+      "repetition_type": "OPTIONAL",
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+      "name": "f64"
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+  "row_groups": [
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+}
diff --git a/test/files/byte_stream_split.zstd.parquet b/test/files/byte_stream_split.zstd.parquet
new file mode 100644
index 0000000..631d492
Binary files /dev/null and b/test/files/byte_stream_split.zstd.parquet differ