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system/node_modules/ethers/lib.esm/utils/rlp-decode.js

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+//See: https://github.com/ethereum/wiki/wiki/RLP
+import { hexlify } from "./data.js";
+import { assert, assertArgument } from "./errors.js";
+import { getBytes } from "./data.js";
+function hexlifyByte(value) {
+    let result = value.toString(16);
+    while (result.length < 2) {
+        result = "0" + result;
+    }
+    return "0x" + result;
+}
+function unarrayifyInteger(data, offset, length) {
+    let result = 0;
+    for (let i = 0; i < length; i++) {
+        result = (result * 256) + data[offset + i];
+    }
+    return result;
+}
+function _decodeChildren(data, offset, childOffset, length) {
+    const result = [];
+    while (childOffset < offset + 1 + length) {
+        const decoded = _decode(data, childOffset);
+        result.push(decoded.result);
+        childOffset += decoded.consumed;
+        assert(childOffset <= offset + 1 + length, "child data too short", "BUFFER_OVERRUN", {
+            buffer: data, length, offset
+        });
+    }
+    return { consumed: (1 + length), result: result };
+}
+// returns { consumed: number, result: Object }
+function _decode(data, offset) {
+    assert(data.length !== 0, "data too short", "BUFFER_OVERRUN", {
+        buffer: data, length: 0, offset: 1
+    });
+    const checkOffset = (offset) => {
+        assert(offset <= data.length, "data short segment too short", "BUFFER_OVERRUN", {
+            buffer: data, length: data.length, offset
+        });
+    };
+    // Array with extra length prefix
+    if (data[offset] >= 0xf8) {
+        const lengthLength = data[offset] - 0xf7;
+        checkOffset(offset + 1 + lengthLength);
+        const length = unarrayifyInteger(data, offset + 1, lengthLength);
+        checkOffset(offset + 1 + lengthLength + length);
+        return _decodeChildren(data, offset, offset + 1 + lengthLength, lengthLength + length);
+    }
+    else if (data[offset] >= 0xc0) {
+        const length = data[offset] - 0xc0;
+        checkOffset(offset + 1 + length);
+        return _decodeChildren(data, offset, offset + 1, length);
+    }
+    else if (data[offset] >= 0xb8) {
+        const lengthLength = data[offset] - 0xb7;
+        checkOffset(offset + 1 + lengthLength);
+        const length = unarrayifyInteger(data, offset + 1, lengthLength);
+        checkOffset(offset + 1 + lengthLength + length);
+        const result = hexlify(data.slice(offset + 1 + lengthLength, offset + 1 + lengthLength + length));
+        return { consumed: (1 + lengthLength + length), result: result };
+    }
+    else if (data[offset] >= 0x80) {
+        const length = data[offset] - 0x80;
+        checkOffset(offset + 1 + length);
+        const result = hexlify(data.slice(offset + 1, offset + 1 + length));
+        return { consumed: (1 + length), result: result };
+    }
+    return { consumed: 1, result: hexlifyByte(data[offset]) };
+}
+/**
+ *  Decodes %%data%% into the structured data it represents.
+ */
+export function decodeRlp(_data) {
+    const data = getBytes(_data, "data");
+    const decoded = _decode(data, 0);
+    assertArgument(decoded.consumed === data.length, "unexpected junk after rlp payload", "data", _data);
+    return decoded.result;
+}
+//# sourceMappingURL=rlp-decode.js.map