diff --git a/src/common/cpp_essentials/base_extentions/qr_formatinformation.rs b/src/common/cpp_essentials/base_extentions/qr_formatinformation.rs
index 414cfa2..15001e6 100644
--- a/src/common/cpp_essentials/base_extentions/qr_formatinformation.rs
+++ b/src/common/cpp_essentials/base_extentions/qr_formatinformation.rs
@@ -24,7 +24,7 @@ impl FormatInformation {
     pub fn DecodeMQR(formatInfoBits: u32) -> Self {
         todo!()
         // // We don't use the additional masking (with 0x4445) to work around potentially non complying MicroQRCode encoders
-        // auto fi = FindBestFormatInfo(0, FORMAT_INFO_DECODE_LOOKUP_MICRO, {formatInfoBits, MirrorBits(formatInfoBits)});
+        // let fi = FindBestFormatInfo(0, FORMAT_INFO_DECODE_LOOKUP_MICRO, {formatInfoBits, MirrorBits(formatInfoBits)});
 
         // constexpr uint8_t BITS_TO_VERSION[] = {1, 2, 2, 3, 3, 4, 4, 4};
 
@@ -37,6 +37,30 @@ impl FormatInformation {
         // return fi;
     }
 
+    pub fn MirrorBits(bits: u32) -> u32 {
+        todo!()
+        // return BitHacks::Reverse(bits) >> 17;
+    }
+
+    pub fn FindBestFormatInfo(mask: u32, lookup: [(u32, u32); 32], bits: &[u32]) -> Self {
+        todo!()
+        // FormatInformation fi;
+
+        // // Some QR codes apparently do not apply the XOR mask. Try without and with additional masking.
+        // for (auto mask : {0, mask})
+        // 	for (int bitsIndex = 0; bitsIndex < Size(bits); ++bitsIndex)
+        // 		for (const auto& [pattern, index] : lookup) {
+        // 			// Find the int in lookup with fewest bits differing
+        // 			if (int hammingDist = BitHacks::CountBitsSet((bits[bitsIndex] ^ mask) ^ pattern); hammingDist < fi.hammingDistance) {
+        // 				fi.index = index;
+        // 				fi.hammingDistance = hammingDist;
+        // 				fi.bitsIndex = bitsIndex;
+        // 			}
+        // 		}
+
+        // return fi;
+    }
+
     pub fn isValid(&self) -> bool {
         todo!()
     }
diff --git a/src/qrcode/cpp_port/bitmatrix_parser.rs b/src/qrcode/cpp_port/bitmatrix_parser.rs
index 2eafb77..275c75d 100644
--- a/src/qrcode/cpp_port/bitmatrix_parser.rs
+++ b/src/qrcode/cpp_port/bitmatrix_parser.rs
@@ -10,7 +10,7 @@ use crate::{
     Exceptions,
 };
 
-use super::detector::AppendBit;
+use super::{data_mask::GetDataMaskBit, detector::AppendBit};
 
 pub fn getBit(bitMatrix: &BitMatrix, x: u32, y: u32, mirrored: Option<bool>) -> bool {
     let mirrored = mirrored.unwrap_or(false);
@@ -121,42 +121,54 @@ pub fn ReadQRCodewords(
     version: VersionRef,
     formatInfo: &FormatInformation,
 ) -> Result<Vec<u8>> {
-    todo!()
-    // BitMatrix functionPattern = version.buildFunctionPattern();
+    let functionPattern: BitMatrix = version.buildFunctionPattern()?;
 
-    // ByteArray result;
-    // result.reserve(version.totalCodewords());
-    // uint8_t currentByte = 0;
-    // bool readingUp = true;
-    // int bitsRead = 0;
-    // int dimension = bitMatrix.height();
-    // // Read columns in pairs, from right to left
-    // for (int x = dimension - 1; x > 0; x -= 2) {
-    // 	// Skip whole column with vertical timing pattern.
-    // 	if (x == 6)
-    // 		x--;
-    // 	// Read alternatingly from bottom to top then top to bottom
-    // 	for (int row = 0; row < dimension; row++) {
-    // 		int y = readingUp ? dimension - 1 - row : row;
-    // 		for (int col = 0; col < 2; col++) {
-    // 			int xx = x - col;
-    // 			// Ignore bits covered by the function pattern
-    // 			if (!functionPattern.get(xx, y)) {
-    // 				// Read a bit
-    // 				AppendBit(currentByte,
-    // 						  GetDataMaskBit(formatInfo.dataMask, xx, y) != getBit(bitMatrix, xx, y, formatInfo.isMirrored));
-    // 				// If we've made a whole byte, save it off
-    // 				if (++bitsRead % 8 == 0)
-    // 					result.push_back(std::exchange(currentByte, 0));
-    // 			}
-    // 		}
-    // 	}
-    // 	readingUp = !readingUp; // switch directions
-    // }
-    // if (Size(result) != version.totalCodewords())
-    // 	return {};
+    let mut result = Vec::new();
+    result.reserve(version.getTotalCodewords() as usize);
+    let mut currentByte = 0;
+    let mut readingUp = true;
+    let mut bitsRead = 0;
+    let dimension = bitMatrix.height();
+    // Read columns in pairs, from right to left
+    let mut x = dimension - 1;
+    while x > 0 {
+        // for (int x = dimension - 1; x > 0; x -= 2) {
+        // Skip whole column with vertical timing pattern.
+        if (x == 6) {
+            x -= 1;
+        }
+        // Read alternatingly from bottom to top then top to bottom
+        for row in 0..dimension {
+            // for (int row = 0; row < dimension; row++) {
+            let y = if readingUp { dimension - 1 - row } else { row };
+            for col in 0..2 {
+                // for (int col = 0; col < 2; col++) {
+                let xx = x - col;
+                // Ignore bits covered by the function pattern
+                if (!functionPattern.get(xx, y)) {
+                    // Read a bit
+                    AppendBit(
+                        &mut currentByte,
+                        GetDataMaskBit(formatInfo.data_mask as u32, xx, y, None)
+                            != getBit(bitMatrix, xx, y, Some(formatInfo.isMirrored)),
+                    );
+                    // If we've made a whole byte, save it off
+                    bitsRead += 1;
+                    if (bitsRead % 8 == 0) {
+                        result.push(std::mem::take(&mut currentByte));
+                    }
+                }
+            }
+        }
+        readingUp = !readingUp; // switch directions
 
-    // return result;
+        x -= 2;
+    }
+    if ((result.len()) != version.getTotalCodewords() as usize) {
+        return Err(Exceptions::FORMAT);
+    }
+
+    Ok(result.iter().copied().map(|x| x as u8).collect())
 }
 
 pub fn ReadMQRCodewords(
diff --git a/src/qrcode/cpp_port/data_mask.rs b/src/qrcode/cpp_port/data_mask.rs
new file mode 100644
index 0000000..1db71c3
--- /dev/null
+++ b/src/qrcode/cpp_port/data_mask.rs
@@ -0,0 +1,47 @@
+/*
+* Copyright 2016 Nu-book Inc.
+* Copyright 2016 ZXing authors
+*/
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::common::BitMatrix;
+
+/**
+* <p>Encapsulates data masks for the data bits in a QR  and micro QR code, per ISO 18004:2006 6.8.</p>
+*
+* <p>Note that the diagram in section 6.8.1 is misleading since it indicates that i is column position
+* and j is row position. In fact, as the text says, i is row position and j is column position.</p>
+*/
+
+pub fn GetDataMaskBit(maskIndex: u32, x: u32, y: u32, isMicro: Option<bool>) -> bool {
+    let isMicro = isMicro.unwrap_or(false);
+    todo!()
+    // if (isMicro) {
+    // 	if (maskIndex < 0 || maskIndex >= 4)
+    // 		throw std::invalid_argument("QRCode maskIndex out of range");
+    // 	maskIndex = std::array{1, 4, 6, 7}[maskIndex]; // map from MQR to QR indices
+    // }
+
+    // switch (maskIndex) {
+    // case 0: return (y + x) % 2 == 0;
+    // case 1: return y % 2 == 0;
+    // case 2: return x % 3 == 0;
+    // case 3: return (y + x) % 3 == 0;
+    // case 4: return ((y / 2) + (x / 3)) % 2 == 0;
+    // case 5: return (y * x) % 6 == 0;
+    // case 6: return ((y * x) % 6) < 3;
+    // case 7: return (y + x + ((y * x) % 3)) % 2 == 0;
+    // }
+
+    // throw std::invalid_argument("QRCode maskIndex out of range");
+}
+
+pub fn GetMaskedBit(
+    bits: &BitMatrix,
+    x: u32,
+    y: u32,
+    maskIndex: u32,
+    isMicro: Option<bool>,
+) -> bool {
+    return GetDataMaskBit(maskIndex, x, y, isMicro) != bits.get(x, y);
+}
diff --git a/src/qrcode/cpp_port/mod.rs b/src/qrcode/cpp_port/mod.rs
index 464babf..2893c1b 100644
--- a/src/qrcode/cpp_port/mod.rs
+++ b/src/qrcode/cpp_port/mod.rs
@@ -1,3 +1,4 @@
+mod data_mask;
 pub mod decoder;
 pub mod detector;