From de687d8bf7e9691c86642ff926f6fc3fb8486224 Mon Sep 17 00:00:00 2001
From: zboris12 <zboris12+zga@gmail.com>
Date: Sat, 10 Aug 2024 20:12:19 +0900
Subject: [PATCH] Fixed a bug of break line.

---
 README.md           |  6 ++++
 lib/zgapdfsigner.js | 78 +++++++++++++++++++++++++++++++++++++++++++--
 test.html           | 34 ++++++++++++++++----
 test4node.js        |  4 +--
 4 files changed, 111 insertions(+), 11 deletions(-)

diff --git a/README.md b/README.md
index 16ba4ed..fbb620d 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,10 @@ Just import the dependencies and this tool.
 <script src="https://unpkg.com/node-forge@1.3.1/dist/forge.min.js" type="text/javascript"></script>
 <script src="https://cdn.jsdelivr.net/npm/zgapdfsigner/dist/zgapdfsigner.min.js" type="text/javascript"></script>
 ```
+When using feature of drawing text, importing the fontkit library is necessary.
+```html
+<script src="https://unpkg.com/@pdf-lib/fontkit/dist/fontkit.umd.min.js" type="text/javascript"></script>
+```
 
 ### [Google Apps Script](https://developers.google.com/apps-script)
 Load the dependencies and this tool.
@@ -64,6 +68,8 @@ function setTimeout(func, sleep){
 var window = globalThis;
 // Load pdf-lib
 eval(UrlFetchApp.fetch("https://unpkg.com/pdf-lib@1.17.1/dist/pdf-lib.min.js").getContentText());
+// It is necessary for drawing text feature.
+eval(UrlFetchApp.fetch("https://unpkg.com/@pdf-lib/fontkit/dist/fontkit.umd.min.js").getContentText());
 // Load node-forge
 eval(UrlFetchApp.fetch("https://unpkg.com/node-forge@1.3.1/dist/forge.min.js").getContentText());
 // Load ZgaPdfSigner
diff --git a/lib/zgapdfsigner.js b/lib/zgapdfsigner.js
index 001344b..5c8386e 100644
--- a/lib/zgapdfsigner.js
+++ b/lib/zgapdfsigner.js
@@ -1275,7 +1275,7 @@ z.SignatureCreator = class{
 						/** @type {number} */
 						var j = sarr2[0] ? parseInt(sarr2[0], 10) : 0;
 						/** @type {number} */
-						var ed = sarr2[sarr2.length - 1] ? parseInt(sarr2[sarr2.length - 1], 10) : (pgcnt ? pgcnt -1 : j);
+						var ed = sarr2[sarr2.length - 1] ? parseInt(sarr2[sarr2.length - 1], 10) : (pgcnt ? pgcnt - 1 : j);
 						while(j <= ed){
 							this.pgidxs.push(j);
 							j++;
@@ -1721,7 +1721,18 @@ z.SignatureCreator = class{
 			}else{
 				/** @type {number} */
 				var width = computeWidthOfText(word);
-				if(currWidth + width > maxWidth){
+				if(width > maxWidth){
+					if(idx > 0){
+						lines.push(currLine);
+						currLine = "";
+						currWidth = 0;
+					}
+					/** @type {SplitLongWordResult} */
+					var slwr = this.splitLongWord(word, width, maxWidth, computeWidthOfText);
+					lines = lines.concat(slwr.words);
+					word = slwr.lastWord;
+					width = slwr.lastWidth;
+				}else if(currWidth + width > maxWidth){
 					lines.push(currLine);
 					currLine = "";
 					currWidth = 0;
@@ -1736,6 +1747,58 @@ z.SignatureCreator = class{
 		return lines;
 	}
 
+	/**
+	 * @private
+	 * @param {string} word
+	 * @param {number} wordWidth
+	 * @param {number} maxWidth
+	 * @param {function(string):number} computeWidthOfText
+	 * @return {SplitLongWordResult}
+	 */
+	splitLongWord(word, wordWidth, maxWidth, computeWidthOfText){
+		/** @type {Array<string>} */
+		var splited = [];
+		/** @type {number} */
+		var wordLen = word.length;
+		while(wordWidth > maxWidth){
+			/** @type {number} */
+			var maxIdx = Math.floor(wordLen * maxWidth / wordWidth) - 1;
+			/** @type {number} */
+			var w = computeWidthOfText(word.substring(0, maxIdx + 1));
+			if(w > maxWidth){
+				while(w > maxWidth){
+					maxIdx--;
+					w -= computeWidthOfText(word.charAt(maxIdx));
+				}
+				maxIdx++;
+			}else{
+				while(w < maxWidth){
+					maxIdx++;
+					if(maxIdx < wordLen){
+						/** @type {number} */
+						var w2 = w + computeWidthOfText(word.charAt(maxIdx));
+						if(w2 > maxWidth){
+							break;
+						}else{
+							w = w2;
+						}
+					}else{
+						break;
+					}
+				}
+			}
+			splited.push(word.substring(0, maxIdx));
+			word = word.substring(maxIdx);
+			wordLen -= maxIdx;
+			wordWidth -= w;
+		}
+		return {
+			words: splited,
+			lastWord: word,
+			lastWidth: wordWidth,
+		};
+	}
+
 	/**
 	 * @private
 	 * @param {DrawLinesOfTextOptions} opts
@@ -1771,10 +1834,21 @@ z.SignatureCreator = class{
 			newopts["y"] = w - x;
 			break;
 		}
+
 		return newopts;
 	}
 };
 
+/**
+ * @typedef
+ * {{
+ *    words: Array<string>,
+ *    lastWord: string,
+ *    lastWidth: number,
+ * }}
+ */
+var SplitLongWordResult;
+
 }
 
 //Only for nodejs Start//
diff --git a/test.html b/test.html
index e4fe26f..b3335e4 100644
--- a/test.html
+++ b/test.html
@@ -5,6 +5,7 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title> Test for ZgaPdfSigner </title>
 <script src="https://unpkg.com/pdf-lib@1.17.1/dist/pdf-lib.min.js" type="text/javascript"></script>
+<script src="https://unpkg.com/@pdf-lib/fontkit/dist/fontkit.umd.min.js" type="text/javascript"></script>
 <script src="https://unpkg.com/node-forge@1.3.1/dist/forge.min.js" type="text/javascript"></script>
 <script src="dist/zgapdfsigner.min.js" type="text/javascript"></script>
 <script type="text/javascript">
@@ -63,6 +64,10 @@
 	if(img){
 		imgType = getFilExt("img");
 	}
+	/** @type {string} */
+	var txt = document.getElementById("txt").value;
+	/** @type {ArrayBuffer} */
+	var font = await readFile("font");
 
 	/** @type {ArrayBuffer} */
 	var pubcert = await readFile("pubcert");
@@ -81,17 +86,30 @@
 			contact: document.getElementById("tContact").value,
 			debug: true,
 		};
-		if(img){
+		if(img || txt){
 			sopt.drawinf = {
 				area: {
 					x: 25, // left
 					y: 150, // top
-					w: 60,
-					h: 60,
+					w: txt ? undefined : 60,
+					h: txt ? undefined : 100,
 				},
-//				pageidx: 2,
-				imgData: img,
-				imgType: imgType,
+				pageidx: "-",
+				imgInfo: img ? {
+					imgData: img,
+					imgType: imgType,
+				} : undefined,
+				textInfo: txt ? {
+					text: txt,
+					fontData: font,
+					color: "f00",
+					size: 16,
+					align: 2,
+					wMax: 80,
+					yOffset: 10,
+					xOffset: 20,
+					noBreaks: "[あいうえおA-Za-z0-9]",
+				} : undefined,
 			};
 		}
 	}
@@ -145,7 +163,7 @@
 	});
 }
 function clearFiles(){
-	["fff","kkk","img","pubcert"].forEach((a_id) => {
+	["fff","kkk","img","font","pubcert"].forEach((a_id) => {
 		document.getElementById(a_id).value = "";
 	});
 }
@@ -187,6 +205,8 @@
 <label>certificate </label><input type="file" id="kkk" /><br />
 <label>passphrase </label><input type="password" id="pwd" /><br />
 <label>signature image </label><input type="file" id="img" /><br />
+<label>signature text </label><input type="text" id="txt" /><br />
+<label>text font </label><input type="file" id="font" /><br />
 <label>permission </label>
 <select id="sperm" onchange="changeSperm()">
 <option value="0">No DocMDP</option>
diff --git a/test4node.js b/test4node.js
index c9336fa..7e271bd 100644
--- a/test4node.js
+++ b/test4node.js
@@ -125,7 +125,7 @@ async function addtsa(pdfPath){
 	/** @type {Uint8Array} */
 	var u8dat = await ser.sign(pdf);
 	/** @type {string} */
-	var outPath = m_path.join(__dirname, workpath+"test_tsa.pdf");
+	var outPath = m_path.join(__dirname, workpath+"tsa_"+m_path.basename(pdfPath));
 	m_fs.writeFileSync(outPath, u8dat);
 	console.log("Output file: " + outPath);
 	return outPath;
@@ -159,7 +159,7 @@ async function main1(angle){
 	}
 
 	if(pfxPath){
-		await sign_protect(pdfPath, pfxPath, ps, 1, imgPath, "あいうえおか\r\n\nThis is a test of text!\n", fontPath);
+		await sign_protect(pdfPath, pfxPath, ps, 1, imgPath, "あいうえおあいうえおか\r\n\nThis is a test of text!\n", fontPath);
 		pdfPath = await sign_protect(pdfPath, pfxPath, ps, 2, undefined, "ありがとうご\r\n\nThis is an another test of text!\n", fontPath);
 		await addtsa(pdfPath);
 	}else{