From 3890bba0d5e0462582a6077830bec5856e393b63 Mon Sep 17 00:00:00 2001
From: Wes Garland <wes@kingsds.network>
Date: Tue, 1 Mar 2022 15:47:15 -0500
Subject: [PATCH 1/3] Fix precision bug in parseFloat affecting select(DOUBLE)
 in prepared statements

---
 lib/packets/packet.js | 41 +++++++----------------------------------
 1 file changed, 7 insertions(+), 34 deletions(-)

diff --git a/lib/packets/packet.js b/lib/packets/packet.js
index ccf3a8458c..69250e7c1b 100644
--- a/lib/packets/packet.js
+++ b/lib/packets/packet.js
@@ -645,44 +645,17 @@ class Packet {
     return new Date(`${str}${timezone}`);
   }
 
-  parseFloat(len) {
-    if (len === null) {
-      return null;
-    }
-    let result = 0;
+  parseFloat(len)
+  {
+    const start = this.offset;
     const end = this.offset + len;
-    let factor = 1;
-    let pastDot = false;
-    let charCode = 0;
+    this.offset += len;
+
     if (len === 0) {
       return 0; // TODO: assert? exception?
     }
-    if (this.buffer[this.offset] === minus) {
-      this.offset++;
-      factor = -1;
-    }
-    if (this.buffer[this.offset] === plus) {
-      this.offset++; // just ignore
-    }
-    while (this.offset < end) {
-      charCode = this.buffer[this.offset];
-      if (charCode === dot) {
-        pastDot = true;
-        this.offset++;
-      } else if (charCode === exponent || charCode === exponentCapital) {
-        this.offset++;
-        const exponentValue = this.parseInt(end - this.offset);
-        return (result / factor) * Math.pow(10, exponentValue);
-      } else {
-        result *= 10;
-        result += this.buffer[this.offset] - 48;
-        this.offset++;
-        if (pastDot) {
-          factor = factor * 10;
-        }
-      }
-    }
-    return result / factor;
+    
+    return parseFloat(this.buffer.slice(start, end).toString('ascii'));
   }
 
   parseLengthCodedIntNoBigCheck() {

From 8669cc6aa7b643d0c322a5efec55e7f34824e5ed Mon Sep 17 00:00:00 2001
From: Wes Garland <wes@kingsds.network>
Date: Tue, 1 Mar 2022 15:54:00 -0500
Subject: [PATCH 2/3] packet.js - style nit to minimize diff

---
 lib/packets/packet.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/packets/packet.js b/lib/packets/packet.js
index 69250e7c1b..f9ee70e7d9 100644
--- a/lib/packets/packet.js
+++ b/lib/packets/packet.js
@@ -645,8 +645,7 @@ class Packet {
     return new Date(`${str}${timezone}`);
   }
 
-  parseFloat(len)
-  {
+  parseFloat(len) {
     const start = this.offset;
     const end = this.offset + len;
     this.offset += len;

From f4698d277d349393e78d40e5d5bcffb0ccf4bc3b Mon Sep 17 00:00:00 2001
From: Wes Garland <wes@kingsds.network>
Date: Tue, 1 Mar 2022 20:55:30 -0500
Subject: [PATCH 3/3] packet.js parseFloat - eliminate unnecessary
 Buffer.slice()

---
 lib/packets/packet.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/packets/packet.js b/lib/packets/packet.js
index f9ee70e7d9..e3c3a562d1 100644
--- a/lib/packets/packet.js
+++ b/lib/packets/packet.js
@@ -653,8 +653,8 @@ class Packet {
     if (len === 0) {
       return 0; // TODO: assert? exception?
     }
-    
-    return parseFloat(this.buffer.slice(start, end).toString('ascii'));
+
+    return parseFloat(this.buffer.toString('ascii', start, end));
   }
 
   parseLengthCodedIntNoBigCheck() {