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authorGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
committerGravatar Piotr Russ <mail@pruss.it> 2020-11-16 00:10:28 +0100
commite06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch)
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Diffstat (limited to 'node_modules/@webassemblyjs/utf8/src/decoder.js')
-rw-r--r--node_modules/@webassemblyjs/utf8/src/decoder.js86
1 files changed, 86 insertions, 0 deletions
diff --git a/node_modules/@webassemblyjs/utf8/src/decoder.js b/node_modules/@webassemblyjs/utf8/src/decoder.js
new file mode 100644
index 0000000..227ba3a
--- /dev/null
+++ b/node_modules/@webassemblyjs/utf8/src/decoder.js
@@ -0,0 +1,86 @@
+function con(b) {
+ if ((b & 0xc0) === 0x80) {
+ return b & 0x3f;
+ } else {
+ throw new Error("invalid UTF-8 encoding");
+ }
+}
+
+function code(min, n) {
+ if (n < min || (0xd800 <= n && n < 0xe000) || n >= 0x10000) {
+ throw new Error("invalid UTF-8 encoding");
+ } else {
+ return n;
+ }
+}
+
+export function decode(bytes) {
+ return _decode(bytes)
+ .map(x => String.fromCharCode(x))
+ .join("");
+}
+
+function _decode(bytes) {
+ if (bytes.length === 0) {
+ return [];
+ }
+
+ /**
+ * 1 byte
+ */
+ {
+ const [b1, ...bs] = bytes;
+
+ if (b1 < 0x80) {
+ return [code(0x0, b1), ..._decode(bs)];
+ }
+
+ if (b1 < 0xc0) {
+ throw new Error("invalid UTF-8 encoding");
+ }
+ }
+
+ /**
+ * 2 bytes
+ */
+ {
+ const [b1, b2, ...bs] = bytes;
+
+ if (b1 < 0xe0) {
+ return [code(0x80, ((b1 & 0x1f) << 6) + con(b2)), ..._decode(bs)];
+ }
+ }
+
+ /**
+ * 3 bytes
+ */
+ {
+ const [b1, b2, b3, ...bs] = bytes;
+
+ if (b1 < 0xf0) {
+ return [
+ code(0x800, ((b1 & 0x0f) << 12) + (con(b2) << 6) + con(b3)),
+ ..._decode(bs)
+ ];
+ }
+ }
+
+ /**
+ * 4 bytes
+ */
+ {
+ const [b1, b2, b3, b4, ...bs] = bytes;
+
+ if (b1 < 0xf8) {
+ return [
+ code(
+ 0x10000,
+ ((((b1 & 0x07) << 18) + con(b2)) << 12) + (con(b3) << 6) + con(b4)
+ ),
+ ..._decode(bs)
+ ];
+ }
+ }
+
+ throw new Error("invalid UTF-8 encoding");
+}