diff --git a/lib/fingerprints.js b/lib/fingerprints.js
index 716ed5a0e5..066f179399 100644
--- a/lib/fingerprints.js
+++ b/lib/fingerprints.js
@@ -36,9 +36,9 @@ function computeFirstMod() {
  * the hashes of the lines near the end of the file.
  *
  * @param callback function that is called with the line number (1-based) and hash for every line
- * @param input The file's contents
+ * @param filepath The path to the file to hash
  */
-function hash(callback, input) {
+async function hash(callback, filepath) {
     // A rolling view in to the input
     const window = Array(BLOCK_SIZE).fill(0);
     // If the character in the window is the start of a new line
@@ -82,12 +82,11 @@ function hash(callback, input) {
     // as we go. Once we reach a point in the window again then we've processed
     // BLOCK_SIZE characters and if the last character at this point in the window
     // was the start of a line then we should output the hash for that line.
-    for (let i = 0, len = input.length; i <= len; i++) {
-        let current = i === len ? 65535 : input.charCodeAt(i);
+    const processCharacter = function (current) {
         // skip tabs, spaces, and line feeds that come directly after a carriage return
         if (current === space || current === tab || (prevCR && current === lf)) {
             prevCR = false;
-            continue;
+            return;
         }
         // replace CR with LF
         if (current === cr) {
@@ -109,7 +108,18 @@ function hash(callback, input) {
             lineStart = true;
         }
         updateHash(current);
-    }
+    };
+    await new Promise((fulfill) => {
+        const readStream = fs.createReadStream(filepath, "utf8");
+        readStream.on("close", fulfill);
+        readStream.on("end", () => {
+            processCharacter(65535);
+        });
+        readStream.on("data", (data) => {
+            for (let i = 0; i < data.length; ++i)
+                processCharacter(data.charCodeAt(i));
+        });
+    });
     // Flush the remaining lines
     for (let i = 0; i < BLOCK_SIZE; i++) {
         if (lineNumbers[index] !== -1) {
@@ -206,8 +216,8 @@ function resolveUriToFile(location, artifacts, checkoutPath, logger) {
 exports.resolveUriToFile = resolveUriToFile;
 // Compute fingerprints for results in the given sarif file
 // and return an updated sarif file contents.
-function addFingerprints(sarifContents, checkoutPath, logger) {
-    var _a, _b;
+async function addFingerprints(sarifContents, checkoutPath, logger) {
+    var _a, _b, _c, _d, _e;
     const sarif = JSON.parse(sarifContents);
     // Gather together results for the same file and construct
     // callbacks to accept hashes for that file and update the location
@@ -222,6 +232,11 @@ function addFingerprints(sarifContents, checkoutPath, logger) {
                 logger.debug(`Unable to compute fingerprint for invalid location: ${JSON.stringify(primaryLocation)}`);
                 continue;
             }
+            if (typeof ((_e = (_d = (_c = primaryLocation) === null || _c === void 0 ? void 0 : _c.physicalLocation) === null || _d === void 0 ? void 0 : _d.region) === null || _e === void 0 ? void 0 : _e.startLine) ===
+                "undefined") {
+                // Locations without a line number are unlikely to be source files
+                continue;
+            }
             const filepath = resolveUriToFile(primaryLocation.physicalLocation.artifactLocation, artifacts, checkoutPath, logger);
             if (!filepath) {
                 continue;
@@ -240,8 +255,7 @@ function addFingerprints(sarifContents, checkoutPath, logger) {
                 c(lineNumber, hashValue);
             }
         };
-        const fileContents = fs.readFileSync(filepath).toString();
-        hash(teeCallback, fileContents);
+        await hash(teeCallback, filepath);
     }
     return JSON.stringify(sarif);
 }
diff --git a/lib/fingerprints.js.map b/lib/fingerprints.js.map
index 11d46ebd11..4c6bffa4e1 100644
--- a/lib/fingerprints.js.map
+++ b/lib/fingerprints.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"fingerprints.js","sourceRoot":"","sources":["../src/fingerprints.ts"],"names":[],"mappings":";;;;;;;;;;;;AAAA,uCAAyB;AAEzB,gDAAwB;AAIxB,MAAM,GAAG,GAAG,IAAI,CAAC,UAAU,CAAC,CAAC,CAAC,CAAC;AAC/B,MAAM,KAAK,GAAG,GAAG,CAAC,UAAU,CAAC,CAAC,CAAC,CAAC;AAChC,MAAM,EAAE,GAAG,IAAI,CAAC,UAAU,CAAC,CAAC,CAAC,CAAC;AAC9B,MAAM,EAAE,GAAG,IAAI,CAAC,UAAU,CAAC,CAAC,CAAC,CAAC;AAC9B,MAAM,UAAU,GAAG,GAAG,CAAC;AACvB,MAAM,GAAG,GAAG,cAAI,CAAC,OAAO,CAAC,EAAE,CAAC,CAAC,CAAC,IAAI;AAElC,8CAA8C;AAC9C,SAAS,eAAe;IACtB,IAAI,QAAQ,GAAG,cAAI,CAAC,GAAG,CAAC,CAAC,IAAI;IAC7B,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,UAAU,EAAE,CAAC,EAAE,EAAE;QACnC,QAAQ,GAAG,QAAQ,CAAC,QAAQ,CAAC,GAAG,CAAC,CAAC;KACnC;IACD,OAAO,QAAQ,CAAC;AAClB,CAAC;AAMD;;;;;;;;;;;GAWG;AACI,KAAK,UAAU,IAAI,CAAC,QAAsB,EAAE,QAAgB;IACjE,iCAAiC;IACjC,MAAM,MAAM,GAAG,KAAK,CAAC,UAAU,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC;IAEzC,4DAA4D;IAC5D,sDAAsD;IACtD,wDAAwD;IACxD,MAAM,WAAW,GAAG,KAAK,CAAC,UAAU,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC,CAAC;IAE/C,4DAA4D;IAC5D,IAAI,OAAO,GAAG,cAAI,CAAC,IAAI,CAAC;IACxB,MAAM,QAAQ,GAAG,eAAe,EAAE,CAAC;IAEnC,qFAAqF;IACrF,IAAI,KAAK,GAAG,CAAC,CAAC;IACd,8EAA8E;IAC9E,IAAI,UAAU,GAAG,CAAC,CAAC;IACnB,2DAA2D;IAC3D,IAAI,SAAS,GAAG,IAAI,CAAC;IACrB,oDAAoD;IACpD,IAAI,MAAM,GAAG,KAAK,CAAC;IACnB,wDAAwD;IACxD,0CAA0C;IAC1C,MAAM,UAAU,GAAoC,EAAE,CAAC;IAEvD,mEAAmE;IACnE,MAAM,UAAU,GAAG;QACjB,MAAM,SAAS,GAAG,OAAO,CAAC,UAAU,EAAE,CAAC,QAAQ,CAAC,EAAE,CAAC,CAAC;QACpD,IAAI,CAAC,UAAU,CAAC,SAAS,CAAC,EAAE;YAC1B,UAAU,CAAC,SAAS,CAAC,GAAG,CAAC,CAAC;SAC3B;QACD,UAAU,CAAC,SAAS,CAAC,EAAE,CAAC;QACxB,QAAQ,CAAC,WAAW,CAAC,KAAK,CAAC,EAAE,GAAG,SAAS,IAAI,UAAU,CAAC,SAAS,CAAC,EAAE,CAAC,CAAC;QACtE,WAAW,CAAC,KAAK,CAAC,GAAG,CAAC,CAAC,CAAC;IAC1B,CAAC,CAAC;IAEF,sEAAsE;IACtE,MAAM,UAAU,GAAG,UAAU,OAAe;QAC1C,MAAM,KAAK,GAAG,MAAM,CAAC,KAAK,CAAC,CAAC;QAC5B,MAAM,CAAC,KAAK,CAAC,GAAG,OAAO,CAAC;QACxB,OAAO,GAAG,GAAG,CAAC,QAAQ,CAAC,OAAO,CAAC;aAC5B,GAAG,CAAC,cAAI,CAAC,OAAO,CAAC,OAAO,CAAC,CAAC;aAC1B,QAAQ,CAAC,QAAQ,CAAC,QAAQ,CAAC,cAAI,CAAC,OAAO,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC;QAEpD,KAAK,GAAG,CAAC,KAAK,GAAG,CAAC,CAAC,GAAG,UAAU,CAAC;IACnC,CAAC,CAAC;IAEF,gFAAgF;IAChF,2EAA2E;IAC3E,8EAA8E;IAC9E,wEAAwE;IACxE,MAAM,gBAAgB,GAAG,UAAU,OAAe;QAChD,+EAA+E;QAC/E,IAAI,OAAO,KAAK,KAAK,IAAI,OAAO,KAAK,GAAG,IAAI,CAAC,MAAM,IAAI,OAAO,KAAK,EAAE,CAAC,EAAE;YACtE,MAAM,GAAG,KAAK,CAAC;YACf,OAAO;SACR;QACD,qBAAqB;QACrB,IAAI,OAAO,KAAK,EAAE,EAAE;YAClB,OAAO,GAAG,EAAE,CAAC;YACb,MAAM,GAAG,IAAI,CAAC;SACf;aAAM;YACL,MAAM,GAAG,KAAK,CAAC;SAChB;QACD,IAAI,WAAW,CAAC,KAAK,CAAC,KAAK,CAAC,CAAC,EAAE;YAC7B,UAAU,EAAE,CAAC;SACd;QACD,IAAI,SAAS,EAAE;YACb,SAAS,GAAG,KAAK,CAAC;YAClB,UAAU,EAAE,CAAC;YACb,WAAW,CAAC,KAAK,CAAC,GAAG,UAAU,CAAC;SACjC;QACD,IAAI,OAAO,KAAK,EAAE,EAAE;YAClB,SAAS,GAAG,IAAI,CAAC;SAClB;QACD,UAAU,CAAC,OAAO,CAAC,CAAC;IACtB,CAAC,CAAC;IAEF,MAAM,IAAI,OAAO,CAAC,CAAC,OAAO,EAAE,EAAE;QAC5B,MAAM,UAAU,GAAG,EAAE,CAAC,gBAAgB,CAAC,QAAQ,EAAE,MAAM,CAAC,CAAC;QACzD,UAAU,CAAC,EAAE,CAAC,OAAO,EAAE,OAAO,CAAC,CAAC;QAChC,UAAU,CAAC,EAAE,CAAC,KAAK,EAAE,GAAG,EAAE;YACxB,gBAAgB,CAAC,KAAK,CAAC,CAAC;QAC1B,CAAC,CAAC,CAAC;QACH,UAAU,CAAC,EAAE,CAAC,MAAM,EAAE,CAAC,IAAI,EAAE,EAAE;YAC7B,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,IAAI,CAAC,MAAM,EAAE,EAAE,CAAC;gBAClC,gBAAgB,CAAC,IAAI,CAAC,UAAU,CAAC,CAAC,CAAC,CAAC,CAAC;QACzC,CAAC,CAAC,CAAC;IACL,CAAC,CAAC,CAAC;IAEH,4BAA4B;IAC5B,KAAK,IAAI,CAAC,GAAG,CAAC,EAAE,CAAC,GAAG,UAAU,EAAE,CAAC,EAAE,EAAE;QACnC,IAAI,WAAW,CAAC,KAAK,CAAC,KAAK,CAAC,CAAC,EAAE;YAC7B,UAAU,EAAE,CAAC;SACd;QACD,UAAU,CAAC,CAAC,CAAC,CAAC;KACf;AACH,CAAC;AAjGD,oBAiGC;AAED,2EAA2E;AAC3E,uFAAuF;AACvF,SAAS,sBAAsB,CAC7B,MAAW,EACX,QAAa,EACb,MAAc;;IAEd,IAAI,iBAAiB,eAAG,QAAQ,CAAC,gBAAgB,0CAAE,MAAM,0CAAE,SAAS,CAAC;IACrE,IAAI,iBAAiB,KAAK,SAAS,EAAE;QACnC,0EAA0E;QAC1E,8EAA8E;QAC9E,gDAAgD;QAChD,iBAAiB,GAAG,CAAC,CAAC;KACvB;IACD,OAAO,UAAU,UAAkB,EAAE,SAAiB;QACpD,gDAAgD;QAChD,IAAI,iBAAiB,KAAK,UAAU,EAAE;YACpC,OAAO;SACR;QAED,IAAI,CAAC,MAAM,CAAC,mBAAmB,EAAE;YAC/B,MAAM,CAAC,mBAAmB,GAAG,EAAE,CAAC;SACjC;QACD,MAAM,mBAAmB,GACvB,MAAM,CAAC,mBAAmB,CAAC,uBAAuB,CAAC;QAErD,0DAA0D;QAC1D,2CAA2C;QAC3C,IAAI,CAAC,mBAAmB,EAAE;YACxB,MAAM,CAAC,mBAAmB,CAAC,uBAAuB,GAAG,SAAS,CAAC;SAChE;aAAM,IAAI,mBAAmB,KAAK,SAAS,EAAE;YAC5C,MAAM,CAAC,OAAO,CACZ,6BAA6B,SAAS,aAAa,QAAQ,CAAC,gBAAgB,CAAC,gBAAgB,CAAC,GAAG,SAAS,UAAU,uDAAuD,mBAAmB,EAAE,CACjM,CAAC;SACH;IACH,CAAC,CAAC;AACJ,CAAC;AAED,iEAAiE;AACjE,qCAAqC;AACrC,gEAAgE;AAChE,6CAA6C;AAC7C,SAAgB,gBAAgB,CAC9B,QAAa,EACb,SAAgB,EAChB,YAAoB,EACpB,MAAc;IAEd,sCAAsC;IACtC,IAAI,CAAC,QAAQ,CAAC,GAAG,IAAI,QAAQ,CAAC,KAAK,KAAK,SAAS,EAAE;QACjD,IACE,OAAO,QAAQ,CAAC,KAAK,KAAK,QAAQ;YAClC,QAAQ,CAAC,KAAK,GAAG,CAAC;YAClB,QAAQ,CAAC,KAAK,IAAI,SAAS,CAAC,MAAM;YAClC,OAAO,SAAS,CAAC,QAAQ,CAAC,KAAK,CAAC,CAAC,QAAQ,KAAK,QAAQ,EACtD;YACA,MAAM,CAAC,KAAK,CAAC,+BAA+B,QAAQ,CAAC,KAAK,cAAc,CAAC,CAAC;YAC1E,OAAO,SAAS,CAAC;SAClB;QACD,QAAQ,GAAG,SAAS,CAAC,QAAQ,CAAC,KAAK,CAAC,CAAC,QAAQ,CAAC;KAC/C;IAED,yBAAyB;IACzB,IAAI,OAAO,QAAQ,CAAC,GAAG,KAAK,QAAQ,EAAE;QACpC,MAAM,CAAC,KAAK,CAAC,6BAA6B,QAAQ,CAAC,GAAG,cAAc,CAAC,CAAC;QACtE,OAAO,SAAS,CAAC;KAClB;IACD,IAAI,GAAG,GAAG,kBAAkB,CAAC,QAAQ,CAAC,GAAG,CAAC,CAAC;IAE3C,iEAAiE;IACjE,MAAM,aAAa,GAAG,SAAS,CAAC;IAChC,IAAI,GAAG,CAAC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\ No newline at end of file
diff --git a/lib/fingerprints.test.js b/lib/fingerprints.test.js
index 6d27f59397..8ae6bcf979 100644
--- a/lib/fingerprints.test.js
+++ b/lib/fingerprints.test.js
@@ -16,28 +16,33 @@ const ava_1 = __importDefault(require("ava"));
 const fingerprints = __importStar(require("./fingerprints"));
 const logging_1 = require("./logging");
 const testing_utils_1 = require("./testing-utils");
+const util = __importStar(require("./util"));
 testing_utils_1.setupTests(ava_1.default);
-function testHash(t, input, expectedHashes) {
-    let index = 0;
-    const callback = function (lineNumber, hash) {
-        t.is(lineNumber, index + 1);
-        t.is(hash, expectedHashes[index]);
-        index++;
-    };
-    fingerprints.hash(callback, input);
-    t.is(index, input.split(/\r\n|\r|\n/).length);
+async function testHash(t, input, expectedHashes) {
+    await util.withTmpDir(async (tmpDir) => {
+        const tmpFile = path.resolve(tmpDir, "testfile");
+        fs.writeFileSync(tmpFile, input);
+        let index = 0;
+        const callback = function (lineNumber, hash) {
+            t.is(lineNumber, index + 1);
+            t.is(hash, expectedHashes[index]);
+            index++;
+        };
+        await fingerprints.hash(callback, tmpFile);
+        t.is(index, input.split(/\r\n|\r|\n/).length);
+    });
 }
-ava_1.default("hash", (t) => {
+ava_1.default("hash", async (t) => {
     // Try empty file
-    testHash(t, "", ["c129715d7a2bc9a3:1"]);
+    await testHash(t, "", ["c129715d7a2bc9a3:1"]);
     // Try various combinations of newline characters
-    testHash(t, " a\nb\n  \t\tc\n d", [
+    await testHash(t, " a\nb\n  \t\tc\n d", [
         "271789c17abda88f:1",
         "54703d4cd895b18:1",
         "180aee12dab6264:1",
         "a23a3dc5e078b07b:1",
     ]);
-    testHash(t, " hello; \t\nworld!!!\n\n\n  \t\tGreetings\n End", [
+    await testHash(t, " hello; \t\nworld!!!\n\n\n  \t\tGreetings\n End", [
         "8b7cf3e952e7aeb2:1",
         "b1ae1287ec4718d9:1",
         "bff680108adb0fcc:1",
@@ -45,7 +50,7 @@ ava_1.default("hash", (t) => {
         "b86d3392aea1be30:1",
         "e6ceba753e1a442:1",
     ]);
-    testHash(t, " hello; \t\nworld!!!\n\n\n  \t\tGreetings\n End\n", [
+    await testHash(t, " hello; \t\nworld!!!\n\n\n  \t\tGreetings\n End\n", [
         "e9496ae3ebfced30:1",
         "fb7c023a8b9ccb3f:1",
         "ce8ba1a563dcdaca:1",
@@ -54,7 +59,7 @@ ava_1.default("hash", (t) => {
         "c8e28b0b4002a3a0:1",
         "c129715d7a2bc9a3:1",
     ]);
-    testHash(t, " hello; \t\nworld!!!\r\r\r  \t\tGreetings\r End\r", [
+    await testHash(t, " hello; \t\nworld!!!\r\r\r  \t\tGreetings\r End\r", [
         "e9496ae3ebfced30:1",
         "fb7c023a8b9ccb3f:1",
         "ce8ba1a563dcdaca:1",
@@ -63,7 +68,7 @@ ava_1.default("hash", (t) => {
         "c8e28b0b4002a3a0:1",
         "c129715d7a2bc9a3:1",
     ]);
-    testHash(t, " hello; \t\r\nworld!!!\r\n\r\n\r\n  \t\tGreetings\r\n End\r\n", [
+    await testHash(t, " hello; \t\r\nworld!!!\r\n\r\n\r\n  \t\tGreetings\r\n End\r\n", [
         "e9496ae3ebfced30:1",
         "fb7c023a8b9ccb3f:1",
         "ce8ba1a563dcdaca:1",
@@ -72,7 +77,7 @@ ava_1.default("hash", (t) => {
         "c8e28b0b4002a3a0:1",
         "c129715d7a2bc9a3:1",
     ]);
-    testHash(t, " hello; \t\nworld!!!\r\n\n\r  \t\tGreetings\r End\r\n", [
+    await testHash(t, " hello; \t\nworld!!!\r\n\n\r  \t\tGreetings\r End\r\n", [
         "e9496ae3ebfced30:1",
         "fb7c023a8b9ccb3f:1",
         "ce8ba1a563dcdaca:1",
@@ -82,7 +87,7 @@ ava_1.default("hash", (t) => {
         "c129715d7a2bc9a3:1",
     ]);
     // Try repeating line that will generate identical hashes
-    testHash(t, "Lorem ipsum dolor sit amet.\n".repeat(10), [
+    await testHash(t, "Lorem ipsum dolor sit amet.\n".repeat(10), [
         "a7f2ff13bc495cf2:1",
         "a7f2ff13bc495cf2:2",
         "a7f2ff13bc495cf2:3",
@@ -95,7 +100,7 @@ ava_1.default("hash", (t) => {
         "cc97dc7b1d7d8f7b:1",
         "c129715d7a2bc9a3:1",
     ]);
-    testHash(t, "x = 2\nx = 1\nprint(x)\nx = 3\nprint(x)\nx = 4\nprint(x)\n", [
+    await testHash(t, "x = 2\nx = 1\nprint(x)\nx = 3\nprint(x)\nx = 4\nprint(x)\n", [
         "e54938cc54b302f1:1",
         "bb609acbe9138d60:1",
         "1131fd5871777f34:1",
@@ -150,7 +155,7 @@ ava_1.default("resolveUriToFile", (t) => {
     t.is(testResolveUriToFile(dirpath, undefined, []), undefined);
     t.is(testResolveUriToFile(`file://${dirpath}`, undefined, []), undefined);
 });
-ava_1.default("addFingerprints", (t) => {
+ava_1.default("addFingerprints", async (t) => {
     // Run an end-to-end test on a test file
     let input = fs
         .readFileSync(`${__dirname}/../src/testdata/fingerprinting.input.sarif`)
@@ -163,9 +168,9 @@ ava_1.default("addFingerprints", (t) => {
     expected = JSON.stringify(JSON.parse(expected));
     // The URIs in the SARIF files resolve to files in the testdata directory
     const checkoutPath = path.normalize(`${__dirname}/../src/testdata`);
-    t.deepEqual(fingerprints.addFingerprints(input, checkoutPath, logging_1.getRunnerLogger(true)), expected);
+    t.deepEqual(await fingerprints.addFingerprints(input, checkoutPath, logging_1.getRunnerLogger(true)), expected);
 });
-ava_1.default("missingRegions", (t) => {
+ava_1.default("missingRegions", async (t) => {
     // Run an end-to-end test on a test file
     let input = fs
         .readFileSync(`${__dirname}/../src/testdata/fingerprinting2.input.sarif`)
@@ -178,6 +183,6 @@ ava_1.default("missingRegions", (t) => {
     expected = JSON.stringify(JSON.parse(expected));
     // The URIs in the SARIF files resolve to files in the testdata directory
     const checkoutPath = path.normalize(`${__dirname}/../src/testdata`);
-    t.deepEqual(fingerprints.addFingerprints(input, checkoutPath, logging_1.getRunnerLogger(true)), expected);
+    t.deepEqual(await fingerprints.addFingerprints(input, checkoutPath, logging_1.getRunnerLogger(true)), expected);
 });
 //# sourceMappingURL=fingerprints.test.js.map
\ No newline at end of file
diff --git a/lib/fingerprints.test.js.map b/lib/fingerprints.test.js.map
index b3433dcb6a..c7597c20ec 100644
--- a/lib/fingerprints.test.js.map
+++ b/lib/fingerprints.test.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"fingerprints.test.js","sourceRoot":"","sources":["../src/fingerprints.test.ts"],"names":[],"mappings":";;;;;;;;;;;;AAAA,uCAAyB;AACzB,2CAA6B;AAG7B,8CAAuB;AAEvB,6DAA+C;AAC/C,uCAA4C;AAC5C,mDAA6C;AAC7C,6CAA+B;AAE/B,0BAAU,CAAC,aAAI,CAAC,CAAC;AAEjB,KAAK,UAAU,QAAQ,CACrB,CAAiB,EACjB,KAAa,EACb,cAAwB;IAExB,MAAM,IAAI,CAAC,UAAU,CAAC,KAAK,EAAE,MAAM,EAAE,EAAE;QACrC,MAAM,OAAO,GAAG,IAAI,CAAC,OAAO,CAAC,MAAM,EAAE,UAAU,CAAC,CAAC;QACjD,EAAE,CAAC,aAAa,CAAC,OAAO,EAAE,KAAK,CAAC,CAAC;QACjC,IAAI,KAAK,GAAG,CAAC,CAAC;QACd,MAAM,QAAQ,GAAG,UAAU,UAAkB,EAAE,IAAY;YACzD,CAAC,CAAC,EAAE,CAAC,UAAU,EAAE,KAAK,GAAG,CAAC,CAAC,CAAC;YAC5B,CAAC,CAAC,EAAE,CAAC,IAAI,EAAE,cAAc,CAAC,KAAK,CAAC,CAAC,CAAC;YAClC,KAAK,EAAE,CAAC;QACV,CAAC,CAAC;QACF,MAAM,YAAY,CAAC,IAAI,CAAC,QAAQ,EAAE,OAAO,CAAC,CAAC;QAC3C,CAAC,CAAC,EAAE,CAAC,KAAK,EAAE,KAAK,CAAC,KAAK,CAAC,YAAY,CAAC,CAAC,MAAM,CAAC,CAAC;IAChD,CAAC,CAAC,CAAC;AACL,CAAC;AAED,aAAI,CAAC,MAAM,EAAE,KAAK,EAAE,CAAiB,EAAE,EAAE;IACvC,iBAAiB;IACjB,MAAM,QAAQ,CAAC,CAAC,EAAE,EAAE,EAAE,CAAC,oBAAoB,CAAC,CAAC,CAAC;IAE9C,iDAAiD;IACjD,MAAM,QAAQ,CAAC,CAAC,EAAE,oBAAoB,EAAE;QACtC,oBAAoB;QACpB,mBAAmB;QACnB,mBAAmB;QACnB,oBAAoB;KACrB,CAAC,CAAC;IACH,MAAM,QAAQ,CAAC,CAAC,EAAE,iDAAiD,EAAE;QACnE,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,mBAAmB;KACpB,CAAC,CAAC;IACH,MAAM,QAAQ,CAAC,CAAC,EAAE,mDAAmD,EAAE;QACrE,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;KACrB,CAAC,CAAC;IACH,MAAM,QAAQ,CAAC,CAAC,EAAE,mDAAmD,EAAE;QACrE,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;KACrB,CAAC,CAAC;IACH,MAAM,QAAQ,CACZ,CAAC,EACD,+DAA+D,EAC/D;QACE,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;KACrB,CACF,CAAC;IACF,MAAM,QAAQ,CAAC,CAAC,EAAE,uDAAuD,EAAE;QACzE,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;KACrB,CAAC,CAAC;IAEH,yDAAyD;IACzD,MAAM,QAAQ,CAAC,CAAC,EAAE,+BAA+B,CAAC,MAAM,CAAC,EAAE,CAAC,EAAE;QAC5D,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;KACrB,CAAC,CAAC;IAEH,MAAM,QAAQ,CACZ,CAAC,EACD,4DAA4D,EAC5D;QACE,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,oBAAoB;QACpB,mBAAmB;QACnB,oBAAoB;KACrB,CACF,CAAC;AACJ,CAAC,CAAC,CAAC;AAEH,SAAS,oBAAoB,CAAC,GAAQ,EAAE,KAAU,EAAE,aAAoB;IACtE,MAAM,QAAQ,GAAG,EAAE,GAAG,EAAE,KAAK,EAAE,CAAC;IAChC,MAAM,SAAS,GAAG,aAAa,CAAC,GAAG,CAAC,CAAC,WAAW,EAAE,EAAE,CAAC,CAAC;QACpD,QAAQ,EAAE,EAAE,GAAG,EAAE,WAAW,EAAE;KAC/B,CAAC,CAAC,CAAC;IACJ,OAAO,YAAY,CAAC,gBAAgB,CAClC,QAAQ,EACR,SAAS,EACT,OAAO,CAAC,GAAG,EAAE,EACb,yBAAe,CAAC,IAAI,CAAC,CACtB,CAAC;AACJ,CAAC;AAED,aAAI,CAAC,kBAAkB,EAAE,CAAC,CAAC,EAAE,EAAE;IAC7B,wFAAwF;IACxF,oFAAoF;IACpF,qFAAqF;IACrF,uDAAuD;IACvD,MAAM,GAAG,GAAG,OAAO,CAAC,GAAG,EAAE,CAAC;IAC1B,MAAM,QAAQ,GAAG,UAAU,CAAC;IAC5B,CAAC,CAAC,IAAI,CAAC,QAAQ,CAAC,UAAU,CAAC,GAAG,GAAG,GAAG,CAAC,CAAC,CAAC;IACvC,MAAM,gBAAgB,GAAG,QAAQ,CAAC,SAAS,CAAC,GAAG,CAAC,MAAM,GAAG,CAAC,CAAC,CAAC;IAE5D,gCAAgC;IAChC,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,QAAQ,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,QAAQ,CAAC,CAAC;IAC9D,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,UAAU,QAAQ,EAAE,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,QAAQ,CAAC,CAAC;IAE1E,mCAAmC;IACnC,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,gBAAgB,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,QAAQ,CAAC,CAAC;IACtE,CAAC,CAAC,EAAE,CACF,oBAAoB,CAAC,UAAU,gBAAgB,EAAE,EAAE,SAAS,EAAE,EAAE,CAAC,EACjE,QAAQ,CACT,CAAC;IAEF,oDAAoD;IACpD,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,iBAAiB,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,SAAS,CAAC,CAAC;IACxE,CAAC,CAAC,EAAE,CACF,oBAAoB,CAAC,wBAAwB,EAAE,SAAS,EAAE,EAAE,CAAC,EAC7D,SAAS,CACV,CAAC;IAEF,8BAA8B;IAC9B,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,WAAW,QAAQ,EAAE,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,SAAS,CAAC,CAAC;IAC5E,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,SAAS,QAAQ,EAAE,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,SAAS,CAAC,CAAC;IAE1E,6BAA6B;IAC7B,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,CAAC,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,SAAS,CAAC,CAAC;IACxD,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,SAAS,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,SAAS,CAAC,CAAC;IAEhE,mCAAmC;IACnC,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,GAAG,QAAQ,GAAG,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,SAAS,CAAC,CAAC;IAErE,oBAAoB;IACpB,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,SAAS,EAAE,CAAC,EAAE,CAAC,QAAQ,CAAC,CAAC,EAAE,QAAQ,CAAC,CAAC;IAC/D,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,SAAS,EAAE,CAAC,EAAE,CAAC,KAAK,EAAE,QAAQ,CAAC,CAAC,EAAE,QAAQ,CAAC,CAAC;IAEtE,gCAAgC;IAChC,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,SAAS,EAAE,CAAC,EAAE,CAAC,QAAQ,CAAC,CAAC,EAAE,SAAS,CAAC,CAAC;IAChE,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,SAAS,EAAE,GAAG,EAAE,CAAC,QAAQ,CAAC,CAAC,EAAE,SAAS,CAAC,CAAC;IAElE,4BAA4B;IAC5B,MAAM,OAAO,GAAG,SAAS,CAAC;IAC1B,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,OAAO,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,SAAS,CAAC,CAAC;IAC9D,CAAC,CAAC,EAAE,CAAC,oBAAoB,CAAC,UAAU,OAAO,EAAE,EAAE,SAAS,EAAE,EAAE,CAAC,EAAE,SAAS,CAAC,CAAC;AAC5E,CAAC,CAAC,CAAC;AAEH,aAAI,CAAC,iBAAiB,EAAE,KAAK,EAAE,CAAC,EAAE,EAAE;IAClC,wCAAwC;IACxC,IAAI,KAAK,GAAG,EAAE;SACX,YAAY,CAAC,GAAG,SAAS,6CAA6C,CAAC;SACvE,QAAQ,EAAE,CAAC;IACd,IAAI,QAAQ,GAAG,EAAE;SACd,YAAY,CAAC,GAAG,SAAS,gDAAgD,CAAC;SAC1E,QAAQ,EAAE,CAAC;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\ No newline at end of file
diff --git a/lib/upload-lib.js b/lib/upload-lib.js
index 1d971c6c44..77189aa5e6 100644
--- a/lib/upload-lib.js
+++ b/lib/upload-lib.js
@@ -243,7 +243,7 @@ async function uploadFiles(sarifFiles, repositoryNwo, commitOid, ref, analysisKe
         validateSarifFileSchema(file, logger);
     }
     let sarifPayload = combineSarifFiles(sarifFiles);
-    sarifPayload = fingerprints.addFingerprints(sarifPayload, checkoutPath, logger);
+    sarifPayload = await fingerprints.addFingerprints(sarifPayload, checkoutPath, logger);
     sarifPayload = populateRunAutomationDetails(sarifPayload, category, analysisKey, environment);
     const zippedSarif = zlib_1.default.gzipSync(sarifPayload).toString("base64");
     const checkoutURI = file_url_1.default(checkoutPath);
diff --git a/lib/upload-lib.js.map b/lib/upload-lib.js.map
index ad0ce01453..0f154e1edd 100644
--- a/lib/upload-lib.js.map
+++ b/lib/upload-lib.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/fingerprints.test.ts b/src/fingerprints.test.ts
index 137d9ae0a7..88b97c45f6 100644
--- a/src/fingerprints.test.ts
+++ b/src/fingerprints.test.ts
@@ -7,32 +7,41 @@ import test from "ava";
 import * as fingerprints from "./fingerprints";
 import { getRunnerLogger } from "./logging";
 import { setupTests } from "./testing-utils";
+import * as util from "./util";
 
 setupTests(test);
 
-function testHash(t: ava.Assertions, input: string, expectedHashes: string[]) {
-  let index = 0;
-  const callback = function (lineNumber: number, hash: string) {
-    t.is(lineNumber, index + 1);
-    t.is(hash, expectedHashes[index]);
-    index++;
-  };
-  fingerprints.hash(callback, input);
-  t.is(index, input.split(/\r\n|\r|\n/).length);
+async function testHash(
+  t: ava.Assertions,
+  input: string,
+  expectedHashes: string[]
+) {
+  await util.withTmpDir(async (tmpDir) => {
+    const tmpFile = path.resolve(tmpDir, "testfile");
+    fs.writeFileSync(tmpFile, input);
+    let index = 0;
+    const callback = function (lineNumber: number, hash: string) {
+      t.is(lineNumber, index + 1);
+      t.is(hash, expectedHashes[index]);
+      index++;
+    };
+    await fingerprints.hash(callback, tmpFile);
+    t.is(index, input.split(/\r\n|\r|\n/).length);
+  });
 }
 
-test("hash", (t: ava.Assertions) => {
+test("hash", async (t: ava.Assertions) => {
   // Try empty file
-  testHash(t, "", ["c129715d7a2bc9a3:1"]);
+  await testHash(t, "", ["c129715d7a2bc9a3:1"]);
 
   // Try various combinations of newline characters
-  testHash(t, " a\nb\n  \t\tc\n d", [
+  await testHash(t, " a\nb\n  \t\tc\n d", [
     "271789c17abda88f:1",
     "54703d4cd895b18:1",
     "180aee12dab6264:1",
     "a23a3dc5e078b07b:1",
   ]);
-  testHash(t, " hello; \t\nworld!!!\n\n\n  \t\tGreetings\n End", [
+  await testHash(t, " hello; \t\nworld!!!\n\n\n  \t\tGreetings\n End", [
     "8b7cf3e952e7aeb2:1",
     "b1ae1287ec4718d9:1",
     "bff680108adb0fcc:1",
@@ -40,7 +49,7 @@ test("hash", (t: ava.Assertions) => {
     "b86d3392aea1be30:1",
     "e6ceba753e1a442:1",
   ]);
-  testHash(t, " hello; \t\nworld!!!\n\n\n  \t\tGreetings\n End\n", [
+  await testHash(t, " hello; \t\nworld!!!\n\n\n  \t\tGreetings\n End\n", [
     "e9496ae3ebfced30:1",
     "fb7c023a8b9ccb3f:1",
     "ce8ba1a563dcdaca:1",
@@ -49,7 +58,7 @@ test("hash", (t: ava.Assertions) => {
     "c8e28b0b4002a3a0:1",
     "c129715d7a2bc9a3:1",
   ]);
-  testHash(t, " hello; \t\nworld!!!\r\r\r  \t\tGreetings\r End\r", [
+  await testHash(t, " hello; \t\nworld!!!\r\r\r  \t\tGreetings\r End\r", [
     "e9496ae3ebfced30:1",
     "fb7c023a8b9ccb3f:1",
     "ce8ba1a563dcdaca:1",
@@ -58,16 +67,20 @@ test("hash", (t: ava.Assertions) => {
     "c8e28b0b4002a3a0:1",
     "c129715d7a2bc9a3:1",
   ]);
-  testHash(t, " hello; \t\r\nworld!!!\r\n\r\n\r\n  \t\tGreetings\r\n End\r\n", [
-    "e9496ae3ebfced30:1",
-    "fb7c023a8b9ccb3f:1",
-    "ce8ba1a563dcdaca:1",
-    "e20e36e16fcb0cc8:1",
-    "b3edc88f2938467e:1",
-    "c8e28b0b4002a3a0:1",
-    "c129715d7a2bc9a3:1",
-  ]);
-  testHash(t, " hello; \t\nworld!!!\r\n\n\r  \t\tGreetings\r End\r\n", [
+  await testHash(
+    t,
+    " hello; \t\r\nworld!!!\r\n\r\n\r\n  \t\tGreetings\r\n End\r\n",
+    [
+      "e9496ae3ebfced30:1",
+      "fb7c023a8b9ccb3f:1",
+      "ce8ba1a563dcdaca:1",
+      "e20e36e16fcb0cc8:1",
+      "b3edc88f2938467e:1",
+      "c8e28b0b4002a3a0:1",
+      "c129715d7a2bc9a3:1",
+    ]
+  );
+  await testHash(t, " hello; \t\nworld!!!\r\n\n\r  \t\tGreetings\r End\r\n", [
     "e9496ae3ebfced30:1",
     "fb7c023a8b9ccb3f:1",
     "ce8ba1a563dcdaca:1",
@@ -78,7 +91,7 @@ test("hash", (t: ava.Assertions) => {
   ]);
 
   // Try repeating line that will generate identical hashes
-  testHash(t, "Lorem ipsum dolor sit amet.\n".repeat(10), [
+  await testHash(t, "Lorem ipsum dolor sit amet.\n".repeat(10), [
     "a7f2ff13bc495cf2:1",
     "a7f2ff13bc495cf2:2",
     "a7f2ff13bc495cf2:3",
@@ -92,16 +105,20 @@ test("hash", (t: ava.Assertions) => {
     "c129715d7a2bc9a3:1",
   ]);
 
-  testHash(t, "x = 2\nx = 1\nprint(x)\nx = 3\nprint(x)\nx = 4\nprint(x)\n", [
-    "e54938cc54b302f1:1",
-    "bb609acbe9138d60:1",
-    "1131fd5871777f34:1",
-    "5c482a0f8b35ea28:1",
-    "54517377da7028d2:1",
-    "2c644846cb18d53e:1",
-    "f1b89f20de0d133:1",
-    "c129715d7a2bc9a3:1",
-  ]);
+  await testHash(
+    t,
+    "x = 2\nx = 1\nprint(x)\nx = 3\nprint(x)\nx = 4\nprint(x)\n",
+    [
+      "e54938cc54b302f1:1",
+      "bb609acbe9138d60:1",
+      "1131fd5871777f34:1",
+      "5c482a0f8b35ea28:1",
+      "54517377da7028d2:1",
+      "2c644846cb18d53e:1",
+      "f1b89f20de0d133:1",
+      "c129715d7a2bc9a3:1",
+    ]
+  );
 });
 
 function testResolveUriToFile(uri: any, index: any, artifactsURIs: any[]) {
@@ -170,7 +187,7 @@ test("resolveUriToFile", (t) => {
   t.is(testResolveUriToFile(`file://${dirpath}`, undefined, []), undefined);
 });
 
-test("addFingerprints", (t) => {
+test("addFingerprints", async (t) => {
   // Run an end-to-end test on a test file
   let input = fs
     .readFileSync(`${__dirname}/../src/testdata/fingerprinting.input.sarif`)
@@ -187,12 +204,16 @@ test("addFingerprints", (t) => {
   const checkoutPath = path.normalize(`${__dirname}/../src/testdata`);
 
   t.deepEqual(
-    fingerprints.addFingerprints(input, checkoutPath, getRunnerLogger(true)),
+    await fingerprints.addFingerprints(
+      input,
+      checkoutPath,
+      getRunnerLogger(true)
+    ),
     expected
   );
 });
 
-test("missingRegions", (t) => {
+test("missingRegions", async (t) => {
   // Run an end-to-end test on a test file
   let input = fs
     .readFileSync(`${__dirname}/../src/testdata/fingerprinting2.input.sarif`)
@@ -209,7 +230,11 @@ test("missingRegions", (t) => {
   const checkoutPath = path.normalize(`${__dirname}/../src/testdata`);
 
   t.deepEqual(
-    fingerprints.addFingerprints(input, checkoutPath, getRunnerLogger(true)),
+    await fingerprints.addFingerprints(
+      input,
+      checkoutPath,
+      getRunnerLogger(true)
+    ),
     expected
   );
 });
diff --git a/src/fingerprints.ts b/src/fingerprints.ts
index 30ed0c44e1..dea3f96223 100644
--- a/src/fingerprints.ts
+++ b/src/fingerprints.ts
@@ -34,9 +34,9 @@ type hashCallback = (lineNumber: number, hash: string) => void;
  * the hashes of the lines near the end of the file.
  *
  * @param callback function that is called with the line number (1-based) and hash for every line
- * @param input The file's contents
+ * @param filepath The path to the file to hash
  */
-export function hash(callback: hashCallback, input: string) {
+export async function hash(callback: hashCallback, filepath: string) {
   // A rolling view in to the input
   const window = Array(BLOCK_SIZE).fill(0);
 
@@ -87,12 +87,11 @@ export function hash(callback: hashCallback, input: string) {
   // as we go. Once we reach a point in the window again then we've processed
   // BLOCK_SIZE characters and if the last character at this point in the window
   // was the start of a line then we should output the hash for that line.
-  for (let i = 0, len = input.length; i <= len; i++) {
-    let current = i === len ? 65535 : input.charCodeAt(i);
+  const processCharacter = function (current: number) {
     // skip tabs, spaces, and line feeds that come directly after a carriage return
     if (current === space || current === tab || (prevCR && current === lf)) {
       prevCR = false;
-      continue;
+      return;
     }
     // replace CR with LF
     if (current === cr) {
@@ -113,7 +112,19 @@ export function hash(callback: hashCallback, input: string) {
       lineStart = true;
     }
     updateHash(current);
-  }
+  };
+
+  await new Promise((fulfill) => {
+    const readStream = fs.createReadStream(filepath, "utf8");
+    readStream.on("close", fulfill);
+    readStream.on("end", () => {
+      processCharacter(65535);
+    });
+    readStream.on("data", (data) => {
+      for (let i = 0; i < data.length; ++i)
+        processCharacter(data.charCodeAt(i));
+    });
+  });
 
   // Flush the remaining lines
   for (let i = 0; i < BLOCK_SIZE; i++) {
@@ -237,11 +248,11 @@ export function resolveUriToFile(
 
 // Compute fingerprints for results in the given sarif file
 // and return an updated sarif file contents.
-export function addFingerprints(
+export async function addFingerprints(
   sarifContents: string,
   checkoutPath: string,
   logger: Logger
-): string {
+): Promise<string> {
   const sarif = JSON.parse(sarifContents);
 
   // Gather together results for the same file and construct
@@ -263,6 +274,14 @@ export function addFingerprints(
         continue;
       }
 
+      if (
+        typeof primaryLocation?.physicalLocation?.region?.startLine ===
+        "undefined"
+      ) {
+        // Locations without a line number are unlikely to be source files
+        continue;
+      }
+
       const filepath = resolveUriToFile(
         primaryLocation.physicalLocation.artifactLocation,
         artifacts,
@@ -289,8 +308,7 @@ export function addFingerprints(
         c(lineNumber, hashValue);
       }
     };
-    const fileContents = fs.readFileSync(filepath).toString();
-    hash(teeCallback, fileContents);
+    await hash(teeCallback, filepath);
   }
 
   return JSON.stringify(sarif);
diff --git a/src/testdata/fingerprinting2.expected.sarif b/src/testdata/fingerprinting2.expected.sarif
index d9cd84c1b0..731fec1469 100644
--- a/src/testdata/fingerprinting2.expected.sarif
+++ b/src/testdata/fingerprinting2.expected.sarif
@@ -30,9 +30,7 @@
                     "message": {
                         "text": "This header file should contain a header guard to prevent multiple inclusion."
                     },
-                    "partialFingerprints": {
-                        "primaryLocationLineHash": "599c824c91d0f75e:1"
-                    },
+                    "partialFingerprints": {},
                     "ruleId": "cpp/missing-header-guard",
                     "ruleIndex": 0
                 }
diff --git a/src/upload-lib.ts b/src/upload-lib.ts
index 7fca8ff716..5bed83652d 100644
--- a/src/upload-lib.ts
+++ b/src/upload-lib.ts
@@ -356,7 +356,7 @@ async function uploadFiles(
   }
 
   let sarifPayload = combineSarifFiles(sarifFiles);
-  sarifPayload = fingerprints.addFingerprints(
+  sarifPayload = await fingerprints.addFingerprints(
     sarifPayload,
     checkoutPath,
     logger