update:分包、对接个人练习

2026-07-09 17:53:29 +08:00
parent ac4d8dfb38
commit 82eedc3ab8
49 changed files with 911 additions and 181 deletions
@@ -0,0 +1,131 @@
+"use strict";
+
+var utf8 = exports;
+var replacementChar = "\ufffd";
+
+function utf8Read(buffer, start, end, fatal) {
+    var str = "";
+    for (var i = start; i < end;) {
+        var first = buffer[i++];
+        if (first <= 0x7F) {
+            str += String.fromCharCode(first);
+            continue;
+        }
+
+        var needed = 0;
+        var codePoint = 0;
+        var minCodePoint = 0;
+
+        if (first >= 0xC2 && first <= 0xDF) {
+            needed = 1;
+            codePoint = first & 0x1F;
+            minCodePoint = 0x80;
+        } else if (first >= 0xE0 && first <= 0xEF) {
+            needed = 2;
+            codePoint = first & 0x0F;
+            minCodePoint = 0x800;
+        } else if (first >= 0xF0 && first <= 0xF4) {
+            needed = 3;
+            codePoint = first & 0x07;
+            minCodePoint = 0x10000;
+        } else {
+            if (fatal) throw Error("invalid UTF-8 encoding");
+            str += replacementChar;
+            continue;
+        }
+
+        if (i + needed > end) {
+            if (fatal) throw Error("invalid UTF-8 encoding");
+            str += replacementChar;
+            break;
+        }
+
+        var valid = true;
+        for (var j = 0; j < needed; ++j) {
+            var next = buffer[i + j];
+            if ((next & 0xC0) !== 0x80) {
+                valid = false;
+                break;
+            }
+            codePoint = codePoint << 6 | next & 0x3F;
+        }
+
+        if (
+            !valid ||
+            codePoint < minCodePoint ||
+            codePoint > 0x10FFFF ||
+            codePoint >= 0xD800 && codePoint <= 0xDFFF
+        ) {
+            if (fatal) throw Error("invalid UTF-8 encoding");
+            str += replacementChar;
+            continue;
+        }
+
+        i += needed;
+        if (codePoint <= 0xFFFF) {
+            str += String.fromCharCode(codePoint);
+        } else {
+            codePoint -= 0x10000;
+            str += String.fromCharCode(0xD800 + (codePoint >> 10));
+            str += String.fromCharCode(0xDC00 + (codePoint & 0x3FF));
+        }
+    }
+    return str;
+}
+
+utf8.length = function utf8_length(string) {
+    var len = 0,
+        c = 0;
+    for (var i = 0; i < string.length; ++i) {
+        c = string.charCodeAt(i);
+        if (c < 128)
+            len += 1;
+        else if (c < 2048)
+            len += 2;
+        else if ((c & 0xFC00) === 0xD800 && (string.charCodeAt(i + 1) & 0xFC00) === 0xDC00) {
+            ++i;
+            len += 4;
+        } else
+            len += 3;
+    }
+    return len;
+};
+
+utf8.read = function utf8_read(buffer, start, end) {
+    if (end - start < 1)
+        return "";
+    return utf8Read(buffer, start, end, false);
+};
+
+utf8.readStrict = function utf8_read_strict(buffer, start, end) {
+    if (end - start < 1)
+        return "";
+    return utf8Read(buffer, start, end, true);
+};
+
+utf8.write = function utf8_write(string, buffer, offset) {
+    var start = offset,
+        c1,
+        c2;
+    for (var i = 0; i < string.length; ++i) {
+        c1 = string.charCodeAt(i);
+        if (c1 < 128) {
+            buffer[offset++] = c1;
+        } else if (c1 < 2048) {
+            buffer[offset++] = c1 >> 6 | 192;
+            buffer[offset++] = c1 & 63 | 128;
+        } else if ((c1 & 0xFC00) === 0xD800 && ((c2 = string.charCodeAt(i + 1)) & 0xFC00) === 0xDC00) {
+            c1 = 0x10000 + ((c1 & 0x03FF) << 10) + (c2 & 0x03FF);
+            ++i;
+            buffer[offset++] = c1 >> 18 | 240;
+            buffer[offset++] = c1 >> 12 & 63 | 128;
+            buffer[offset++] = c1 >> 6 & 63 | 128;
+            buffer[offset++] = c1 & 63 | 128;
+        } else {
+            buffer[offset++] = c1 >> 12 | 224;
+            buffer[offset++] = c1 >> 6 & 63 | 128;
+            buffer[offset++] = c1 & 63 | 128;
+        }
+    }
+    return offset - start;
+};