From c82a6dc39b17e7b5b9e509bcde37e6881049c8a1 Mon Sep 17 00:00:00 2001
From: Matt Nadareski <mnadareski@outlook.com>
Date: Sun, 5 Jan 2025 23:39:00 -0500
Subject: [PATCH] Add stream GetStandardHashes variant

---
 SabreTools.Hashing.Test/HashToolTests.cs | 15 ++++++++++++++-
 SabreTools.Hashing/HashTool.cs           | 23 +++++++++++++++++++++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/SabreTools.Hashing.Test/HashToolTests.cs b/SabreTools.Hashing.Test/HashToolTests.cs
index b0ad137..44baa0e 100644
--- a/SabreTools.Hashing.Test/HashToolTests.cs
+++ b/SabreTools.Hashing.Test/HashToolTests.cs
@@ -32,7 +32,7 @@ namespace SabreTools.Hashing.Test
         }
 
         [Fact]
-        public void GetStandardHashesTest()
+        public void GetStandardHashesFileTest()
         {
             bool gotHashes = HashTool.GetStandardHashes(_hashFilePath, out long actualSize, out string? crc32, out string? md5, out string? sha1);
 
@@ -43,6 +43,19 @@ namespace SabreTools.Hashing.Test
             TestHelper.ValidateHash(HashType.SHA1, sha1);
         }
 
+        [Fact]
+        public void GetStandardHashesStreamTest()
+        {
+            var fileStream = File.OpenRead(_hashFilePath);
+            bool gotHashes = HashTool.GetStandardHashes(fileStream, out long actualSize, out string? crc32, out string? md5, out string? sha1);
+
+            Assert.True(gotHashes);
+            TestHelper.ValidateSize(actualSize);
+            TestHelper.ValidateHash(HashType.CRC32, crc32);
+            TestHelper.ValidateHash(HashType.MD5, md5);
+            TestHelper.ValidateHash(HashType.SHA1, sha1);
+        }
+
         [Fact]
         public void GetFileHashesParallelTest()
         {
diff --git a/SabreTools.Hashing/HashTool.cs b/SabreTools.Hashing/HashTool.cs
index 8f917c2..f94f640 100644
--- a/SabreTools.Hashing/HashTool.cs
+++ b/SabreTools.Hashing/HashTool.cs
@@ -35,6 +35,29 @@ namespace SabreTools.Hashing
             return true;
         }
 
+        /// <summary>
+        /// Get CRC-32, MD5, and SHA-1 hashes from an input stream
+        /// </summary>
+        /// <param name="stream">Input stream</param>
+        /// <returns>True if hashing was successful, false otherwise</returns>
+        public static bool GetStandardHashes(Stream stream, out long size, out string? crc32, out string? md5, out string? sha1)
+        {
+            // Set all initial values
+            crc32 = null; md5 = null; sha1 = null;
+
+            // Get all file hashes
+            HashType[] standardHashTypes = [HashType.CRC32, HashType.MD5, HashType.SHA1];
+            var fileHashes = GetStreamHashesAndSize(stream, standardHashTypes, out size);
+            if (fileHashes == null)
+                return false;
+
+            // Assign the file hashes and return
+            crc32 = fileHashes[HashType.CRC32];
+            md5 = fileHashes[HashType.MD5];
+            sha1 = fileHashes[HashType.SHA1];
+            return true;
+        }
+
         #region File Hashes Without Size
 
         /// <summary>