V1_commit_RGC

SuiviREForamteur/node_modules/fast-png/lib-esm/helpers/text.js

@@ -0,0 +1,51 @@
+import { writeCrc } from './crc';
+// https://www.w3.org/TR/png/#11tEXt
+export const textChunkName = 'tEXt';
+const NULL = 0;
+const latin1Decoder = new TextDecoder('latin1');
+function validateKeyword(keyword) {
+    validateLatin1(keyword);
+    if (keyword.length === 0 || keyword.length > 79) {
+        throw new Error('keyword length must be between 1 and 79');
+    }
+}
+// eslint-disable-next-line no-control-regex
+const latin1Regex = /^[\u0000-\u00FF]*$/;
+function validateLatin1(text) {
+    if (!latin1Regex.test(text)) {
+        throw new Error('invalid latin1 text');
+    }
+}
+export function decodetEXt(text, buffer, length) {
+    const keyword = readKeyword(buffer);
+    text[keyword] = readLatin1(buffer, length - keyword.length - 1);
+}
+export function encodetEXt(buffer, keyword, text) {
+    validateKeyword(keyword);
+    validateLatin1(text);
+    const length = keyword.length + 1 /* NULL */ + text.length;
+    buffer.writeUint32(length);
+    buffer.writeChars(textChunkName);
+    buffer.writeChars(keyword);
+    buffer.writeByte(NULL);
+    buffer.writeChars(text);
+    writeCrc(buffer, length + 4);
+}
+// https://www.w3.org/TR/png/#11keywords
+export function readKeyword(buffer) {
+    buffer.mark();
+    while (buffer.readByte() !== NULL) {
+        /* advance */
+    }
+    const end = buffer.offset;
+    buffer.reset();
+    const keyword = latin1Decoder.decode(buffer.readBytes(end - buffer.offset - 1));
+    // NULL
+    buffer.skip(1);
+    validateKeyword(keyword);
+    return keyword;
+}
+export function readLatin1(buffer, length) {
+    return latin1Decoder.decode(buffer.readBytes(length));
+}
+//# sourceMappingURL=text.js.map