fix(index): set correct "file size" if pdfInfo() passed a buffer (#427

)

src/index.js

@@ -439,9 +439,16 @@ class Poppler {
 				versionInfo
 			);
 
+			/**
+			 * Poppler does not set the "File size" metadata value if passed
+			 * a Buffer via stdin, so need to retrieve it from the Buffer
+			 */
+			let fileSize;
+
 			return new Promise((resolve, reject) => {
 				if (Buffer.isBuffer(file)) {
 					args.push("-");
+					fileSize = file.length;
 				} else {
 					args.push(file);
 				}
@@ -469,6 +476,13 @@ class Poppler {
 
 				child.on("close", async () => {
 					if (stdOut !== "") {
+						if (fileSize) {
+							stdOut = stdOut.replace(
+								/(File\s+size:\s+)0(\s+)bytes/,
+								`$1${fileSize}$2bytes`
+							);
+						}
+
 						if (options.printAsJson === true) {
 							/**
 							 * Thanks to @sainf for this solution

src/index.test.js

@@ -364,6 +364,21 @@ describe("Node-Poppler Module", () => {
 	});
 
 	describe("pdfInfo Function", () => {
+		const pdfInfoObject = {
+			tagged: "yes",
+			userProperties: "no",
+			suspects: "no",
+			form: "AcroForm",
+			javaScript: "no",
+			pages: "16",
+			encrypted: "no",
+			pageSize: "595.276 x 841.89 pts (A4)",
+			pageRot: "0",
+			fileSize: "583094 bytes",
+			optimized: "no",
+			pdfVersion: "1.3",
+		};
+
 		test("Should list info of PDF file", async () => {
 			const poppler = new Poppler(testBinaryPath);
 
@@ -379,20 +394,7 @@ describe("Node-Poppler Module", () => {
 				printAsJson: true,
 			});
 
-			expect(res).toMatchObject({
-				tagged: "yes",
-				userProperties: "no",
-				suspects: "no",
-				form: "AcroForm",
-				javaScript: "no",
-				pages: "16",
-				encrypted: "no",
-				pageSize: "595.276 x 841.89 pts (A4)",
-				pageRot: "0",
-				fileSize: "583094 bytes",
-				optimized: "no",
-				pdfVersion: "1.3",
-			});
+			expect(res).toMatchObject(pdfInfoObject);
 		});
 
 		test("Should list info of PDF file as Buffer", async () => {
@@ -404,6 +406,17 @@ describe("Node-Poppler Module", () => {
 			expect(res).toEqual(expect.stringContaining("Pages:"));
 		});
 
+		test("Should list info of PDF file as Buffer as a JSON object", async () => {
+			const poppler = new Poppler(testBinaryPath);
+			const attachmentFile = await fs.promises.readFile(file);
+
+			const res = await poppler.pdfInfo(attachmentFile, {
+				printAsJson: true,
+			});
+
+			expect(res).toMatchObject(pdfInfoObject);
+		});
+
 		test("Should return an Error object if file passed not PDF format", async () => {
 			const poppler = new Poppler(testBinaryPath);
 			const testTxtFile = `${testDirectory}test.txt`;