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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)
tree55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/@webassemblyjs/leb128/esm
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-rw-r--r--node_modules/@webassemblyjs/leb128/esm/bits.js145
-rw-r--r--node_modules/@webassemblyjs/leb128/esm/bufs.js218
-rw-r--r--node_modules/@webassemblyjs/leb128/esm/index.js34
-rw-r--r--node_modules/@webassemblyjs/leb128/esm/leb.js316
4 files changed, 713 insertions, 0 deletions
diff --git a/node_modules/@webassemblyjs/leb128/esm/bits.js b/node_modules/@webassemblyjs/leb128/esm/bits.js
new file mode 100644
index 0000000..4c763cd
--- /dev/null
+++ b/node_modules/@webassemblyjs/leb128/esm/bits.js
@@ -0,0 +1,145 @@
+// Copyright 2012 The Obvious Corporation.
+
+/*
+ * bits: Bitwise buffer utilities. The utilities here treat a buffer
+ * as a little-endian bigint, so the lowest-order bit is bit #0 of
+ * `buffer[0]`, and the highest-order bit is bit #7 of
+ * `buffer[buffer.length - 1]`.
+ */
+
+/*
+ * Modules used
+ */
+"use strict";
+/*
+ * Exported bindings
+ */
+
+/**
+ * Extracts the given number of bits from the buffer at the indicated
+ * index, returning a simple number as the result. If bits are requested
+ * that aren't covered by the buffer, the `defaultBit` is used as their
+ * value.
+ *
+ * The `bitLength` must be no more than 32. The `defaultBit` if not
+ * specified is taken to be `0`.
+ */
+
+export function extract(buffer, bitIndex, bitLength, defaultBit) {
+ if (bitLength < 0 || bitLength > 32) {
+ throw new Error("Bad value for bitLength.");
+ }
+
+ if (defaultBit === undefined) {
+ defaultBit = 0;
+ } else if (defaultBit !== 0 && defaultBit !== 1) {
+ throw new Error("Bad value for defaultBit.");
+ }
+
+ var defaultByte = defaultBit * 0xff;
+ var result = 0; // All starts are inclusive. The {endByte, endBit} pair is exclusive, but
+ // if endBit !== 0, then endByte is inclusive.
+
+ var lastBit = bitIndex + bitLength;
+ var startByte = Math.floor(bitIndex / 8);
+ var startBit = bitIndex % 8;
+ var endByte = Math.floor(lastBit / 8);
+ var endBit = lastBit % 8;
+
+ if (endBit !== 0) {
+ // `(1 << endBit) - 1` is the mask of all bits up to but not including
+ // the endBit.
+ result = get(endByte) & (1 << endBit) - 1;
+ }
+
+ while (endByte > startByte) {
+ endByte--;
+ result = result << 8 | get(endByte);
+ }
+
+ result >>>= startBit;
+ return result;
+
+ function get(index) {
+ var result = buffer[index];
+ return result === undefined ? defaultByte : result;
+ }
+}
+/**
+ * Injects the given bits into the given buffer at the given index. Any
+ * bits in the value beyond the length to set are ignored.
+ */
+
+export function inject(buffer, bitIndex, bitLength, value) {
+ if (bitLength < 0 || bitLength > 32) {
+ throw new Error("Bad value for bitLength.");
+ }
+
+ var lastByte = Math.floor((bitIndex + bitLength - 1) / 8);
+
+ if (bitIndex < 0 || lastByte >= buffer.length) {
+ throw new Error("Index out of range.");
+ } // Just keeping it simple, until / unless profiling shows that this
+ // is a problem.
+
+
+ var atByte = Math.floor(bitIndex / 8);
+ var atBit = bitIndex % 8;
+
+ while (bitLength > 0) {
+ if (value & 1) {
+ buffer[atByte] |= 1 << atBit;
+ } else {
+ buffer[atByte] &= ~(1 << atBit);
+ }
+
+ value >>= 1;
+ bitLength--;
+ atBit = (atBit + 1) % 8;
+
+ if (atBit === 0) {
+ atByte++;
+ }
+ }
+}
+/**
+ * Gets the sign bit of the given buffer.
+ */
+
+export function getSign(buffer) {
+ return buffer[buffer.length - 1] >>> 7;
+}
+/**
+ * Gets the zero-based bit number of the highest-order bit with the
+ * given value in the given buffer.
+ *
+ * If the buffer consists entirely of the other bit value, then this returns
+ * `-1`.
+ */
+
+export function highOrder(bit, buffer) {
+ var length = buffer.length;
+ var fullyWrongByte = (bit ^ 1) * 0xff; // the other-bit extended to a full byte
+
+ while (length > 0 && buffer[length - 1] === fullyWrongByte) {
+ length--;
+ }
+
+ if (length === 0) {
+ // Degenerate case. The buffer consists entirely of ~bit.
+ return -1;
+ }
+
+ var byteToCheck = buffer[length - 1];
+ var result = length * 8 - 1;
+
+ for (var i = 7; i > 0; i--) {
+ if ((byteToCheck >> i & 1) === bit) {
+ break;
+ }
+
+ result--;
+ }
+
+ return result;
+} \ No newline at end of file
diff --git a/node_modules/@webassemblyjs/leb128/esm/bufs.js b/node_modules/@webassemblyjs/leb128/esm/bufs.js
new file mode 100644
index 0000000..7e2a2bf
--- /dev/null
+++ b/node_modules/@webassemblyjs/leb128/esm/bufs.js
@@ -0,0 +1,218 @@
+// Copyright 2012 The Obvious Corporation.
+
+/*
+ * bufs: Buffer utilities.
+ */
+
+/*
+ * Module variables
+ */
+
+/** Pool of buffers, where `bufPool[x].length === x`. */
+var bufPool = [];
+/** Maximum length of kept temporary buffers. */
+
+var TEMP_BUF_MAXIMUM_LENGTH = 20;
+/** Minimum exactly-representable 64-bit int. */
+
+var MIN_EXACT_INT64 = -0x8000000000000000;
+/** Maximum exactly-representable 64-bit int. */
+
+var MAX_EXACT_INT64 = 0x7ffffffffffffc00;
+/** Maximum exactly-representable 64-bit uint. */
+
+var MAX_EXACT_UINT64 = 0xfffffffffffff800;
+/**
+ * The int value consisting just of a 1 in bit #32 (that is, one more
+ * than the maximum 32-bit unsigned value).
+ */
+
+var BIT_32 = 0x100000000;
+/**
+ * The int value consisting just of a 1 in bit #64 (that is, one more
+ * than the maximum 64-bit unsigned value).
+ */
+
+var BIT_64 = 0x10000000000000000;
+/*
+ * Helper functions
+ */
+
+/**
+ * Masks off all but the lowest bit set of the given number.
+ */
+
+function lowestBit(num) {
+ return num & -num;
+}
+/**
+ * Gets whether trying to add the second number to the first is lossy
+ * (inexact). The first number is meant to be an accumulated result.
+ */
+
+
+function isLossyToAdd(accum, num) {
+ if (num === 0) {
+ return false;
+ }
+
+ var lowBit = lowestBit(num);
+ var added = accum + lowBit;
+
+ if (added === accum) {
+ return true;
+ }
+
+ if (added - lowBit !== accum) {
+ return true;
+ }
+
+ return false;
+}
+/*
+ * Exported functions
+ */
+
+/**
+ * Allocates a buffer of the given length, which is initialized
+ * with all zeroes. This returns a buffer from the pool if it is
+ * available, or a freshly-allocated buffer if not.
+ */
+
+
+export function alloc(length) {
+ var result = bufPool[length];
+
+ if (result) {
+ bufPool[length] = undefined;
+ } else {
+ result = new Buffer(length);
+ }
+
+ result.fill(0);
+ return result;
+}
+/**
+ * Releases a buffer back to the pool.
+ */
+
+export function free(buffer) {
+ var length = buffer.length;
+
+ if (length < TEMP_BUF_MAXIMUM_LENGTH) {
+ bufPool[length] = buffer;
+ }
+}
+/**
+ * Resizes a buffer, returning a new buffer. Returns the argument if
+ * the length wouldn't actually change. This function is only safe to
+ * use if the given buffer was allocated within this module (since
+ * otherwise the buffer might possibly be shared externally).
+ */
+
+export function resize(buffer, length) {
+ if (length === buffer.length) {
+ return buffer;
+ }
+
+ var newBuf = alloc(length);
+ buffer.copy(newBuf);
+ free(buffer);
+ return newBuf;
+}
+/**
+ * Reads an arbitrary signed int from a buffer.
+ */
+
+export function readInt(buffer) {
+ var length = buffer.length;
+ var positive = buffer[length - 1] < 0x80;
+ var result = positive ? 0 : -1;
+ var lossy = false; // Note: We can't use bit manipulation here, since that stops
+ // working if the result won't fit in a 32-bit int.
+
+ if (length < 7) {
+ // Common case which can't possibly be lossy (because the result has
+ // no more than 48 bits, and loss only happens with 54 or more).
+ for (var i = length - 1; i >= 0; i--) {
+ result = result * 0x100 + buffer[i];
+ }
+ } else {
+ for (var _i = length - 1; _i >= 0; _i--) {
+ var one = buffer[_i];
+ result *= 0x100;
+
+ if (isLossyToAdd(result, one)) {
+ lossy = true;
+ }
+
+ result += one;
+ }
+ }
+
+ return {
+ value: result,
+ lossy: lossy
+ };
+}
+/**
+ * Reads an arbitrary unsigned int from a buffer.
+ */
+
+export function readUInt(buffer) {
+ var length = buffer.length;
+ var result = 0;
+ var lossy = false; // Note: See above in re bit manipulation.
+
+ if (length < 7) {
+ // Common case which can't possibly be lossy (see above).
+ for (var i = length - 1; i >= 0; i--) {
+ result = result * 0x100 + buffer[i];
+ }
+ } else {
+ for (var _i2 = length - 1; _i2 >= 0; _i2--) {
+ var one = buffer[_i2];
+ result *= 0x100;
+
+ if (isLossyToAdd(result, one)) {
+ lossy = true;
+ }
+
+ result += one;
+ }
+ }
+
+ return {
+ value: result,
+ lossy: lossy
+ };
+}
+/**
+ * Writes a little-endian 64-bit signed int into a buffer.
+ */
+
+export function writeInt64(value, buffer) {
+ if (value < MIN_EXACT_INT64 || value > MAX_EXACT_INT64) {
+ throw new Error("Value out of range.");
+ }
+
+ if (value < 0) {
+ value += BIT_64;
+ }
+
+ writeUInt64(value, buffer);
+}
+/**
+ * Writes a little-endian 64-bit unsigned int into a buffer.
+ */
+
+export function writeUInt64(value, buffer) {
+ if (value < 0 || value > MAX_EXACT_UINT64) {
+ throw new Error("Value out of range.");
+ }
+
+ var lowWord = value % BIT_32;
+ var highWord = Math.floor(value / BIT_32);
+ buffer.writeUInt32LE(lowWord, 0);
+ buffer.writeUInt32LE(highWord, 4);
+} \ No newline at end of file
diff --git a/node_modules/@webassemblyjs/leb128/esm/index.js b/node_modules/@webassemblyjs/leb128/esm/index.js
new file mode 100644
index 0000000..7ee23fa
--- /dev/null
+++ b/node_modules/@webassemblyjs/leb128/esm/index.js
@@ -0,0 +1,34 @@
+import leb from "./leb";
+/**
+ * According to https://webassembly.github.io/spec/core/binary/values.html#binary-int
+ * max = ceil(32/7)
+ */
+
+export var MAX_NUMBER_OF_BYTE_U32 = 5;
+/**
+ * According to https://webassembly.github.io/spec/core/binary/values.html#binary-int
+ * max = ceil(64/7)
+ */
+
+export var MAX_NUMBER_OF_BYTE_U64 = 10;
+export function decodeInt64(encodedBuffer, index) {
+ return leb.decodeInt64(encodedBuffer, index);
+}
+export function decodeUInt64(encodedBuffer, index) {
+ return leb.decodeUInt64(encodedBuffer, index);
+}
+export function decodeInt32(encodedBuffer, index) {
+ return leb.decodeInt32(encodedBuffer, index);
+}
+export function decodeUInt32(encodedBuffer, index) {
+ return leb.decodeUInt32(encodedBuffer, index);
+}
+export function encodeU32(v) {
+ return leb.encodeUInt32(v);
+}
+export function encodeI32(v) {
+ return leb.encodeInt32(v);
+}
+export function encodeI64(v) {
+ return leb.encodeInt64(v);
+} \ No newline at end of file
diff --git a/node_modules/@webassemblyjs/leb128/esm/leb.js b/node_modules/@webassemblyjs/leb128/esm/leb.js
new file mode 100644
index 0000000..1b6ee09
--- /dev/null
+++ b/node_modules/@webassemblyjs/leb128/esm/leb.js
@@ -0,0 +1,316 @@
+// Copyright 2012 The Obvious Corporation.
+
+/*
+ * leb: LEB128 utilities.
+ */
+
+/*
+ * Modules used
+ */
+"use strict";
+
+import Long from "@xtuc/long";
+import * as bits from "./bits";
+import * as bufs from "./bufs";
+/*
+ * Module variables
+ */
+
+/** The minimum possible 32-bit signed int. */
+
+var MIN_INT32 = -0x80000000;
+/** The maximum possible 32-bit signed int. */
+
+var MAX_INT32 = 0x7fffffff;
+/** The maximum possible 32-bit unsigned int. */
+
+var MAX_UINT32 = 0xffffffff;
+/** The minimum possible 64-bit signed int. */
+// const MIN_INT64 = -0x8000000000000000;
+
+/**
+ * The maximum possible 64-bit signed int that is representable as a
+ * JavaScript number.
+ */
+// const MAX_INT64 = 0x7ffffffffffffc00;
+
+/**
+ * The maximum possible 64-bit unsigned int that is representable as a
+ * JavaScript number.
+ */
+// const MAX_UINT64 = 0xfffffffffffff800;
+
+/*
+ * Helper functions
+ */
+
+/**
+ * Determines the number of bits required to encode the number
+ * represented in the given buffer as a signed value. The buffer is
+ * taken to represent a signed number in little-endian form.
+ *
+ * The number of bits to encode is the (zero-based) bit number of the
+ * highest-order non-sign-matching bit, plus two. For example:
+ *
+ * 11111011 01110101
+ * high low
+ *
+ * The sign bit here is 1 (that is, it's a negative number). The highest
+ * bit number that doesn't match the sign is bit #10 (where the lowest-order
+ * bit is bit #0). So, we have to encode at least 12 bits total.
+ *
+ * As a special degenerate case, the numbers 0 and -1 each require just one bit.
+ */
+
+function signedBitCount(buffer) {
+ return bits.highOrder(bits.getSign(buffer) ^ 1, buffer) + 2;
+}
+/**
+ * Determines the number of bits required to encode the number
+ * represented in the given buffer as an unsigned value. The buffer is
+ * taken to represent an unsigned number in little-endian form.
+ *
+ * The number of bits to encode is the (zero-based) bit number of the
+ * highest-order 1 bit, plus one. For example:
+ *
+ * 00011000 01010011
+ * high low
+ *
+ * The highest-order 1 bit here is bit #12 (where the lowest-order bit
+ * is bit #0). So, we have to encode at least 13 bits total.
+ *
+ * As a special degenerate case, the number 0 requires 1 bit.
+ */
+
+
+function unsignedBitCount(buffer) {
+ var result = bits.highOrder(1, buffer) + 1;
+ return result ? result : 1;
+}
+/**
+ * Common encoder for both signed and unsigned ints. This takes a
+ * bigint-ish buffer, returning an LEB128-encoded buffer.
+ */
+
+
+function encodeBufferCommon(buffer, signed) {
+ var signBit;
+ var bitCount;
+
+ if (signed) {
+ signBit = bits.getSign(buffer);
+ bitCount = signedBitCount(buffer);
+ } else {
+ signBit = 0;
+ bitCount = unsignedBitCount(buffer);
+ }
+
+ var byteCount = Math.ceil(bitCount / 7);
+ var result = bufs.alloc(byteCount);
+
+ for (var i = 0; i < byteCount; i++) {
+ var payload = bits.extract(buffer, i * 7, 7, signBit);
+ result[i] = payload | 0x80;
+ } // Mask off the top bit of the last byte, to indicate the end of the
+ // encoding.
+
+
+ result[byteCount - 1] &= 0x7f;
+ return result;
+}
+/**
+ * Gets the byte-length of the value encoded in the given buffer at
+ * the given index.
+ */
+
+
+function encodedLength(encodedBuffer, index) {
+ var result = 0;
+
+ while (encodedBuffer[index + result] >= 0x80) {
+ result++;
+ }
+
+ result++; // to account for the last byte
+
+ if (index + result > encodedBuffer.length) {// FIXME(sven): seems to cause false positives
+ // throw new Error("integer representation too long");
+ }
+
+ return result;
+}
+/**
+ * Common decoder for both signed and unsigned ints. This takes an
+ * LEB128-encoded buffer, returning a bigint-ish buffer.
+ */
+
+
+function decodeBufferCommon(encodedBuffer, index, signed) {
+ index = index === undefined ? 0 : index;
+ var length = encodedLength(encodedBuffer, index);
+ var bitLength = length * 7;
+ var byteLength = Math.ceil(bitLength / 8);
+ var result = bufs.alloc(byteLength);
+ var outIndex = 0;
+
+ while (length > 0) {
+ bits.inject(result, outIndex, 7, encodedBuffer[index]);
+ outIndex += 7;
+ index++;
+ length--;
+ }
+
+ var signBit;
+ var signByte;
+
+ if (signed) {
+ // Sign-extend the last byte.
+ var lastByte = result[byteLength - 1];
+ var endBit = outIndex % 8;
+
+ if (endBit !== 0) {
+ var shift = 32 - endBit; // 32 because JS bit ops work on 32-bit ints.
+
+ lastByte = result[byteLength - 1] = lastByte << shift >> shift & 0xff;
+ }
+
+ signBit = lastByte >> 7;
+ signByte = signBit * 0xff;
+ } else {
+ signBit = 0;
+ signByte = 0;
+ } // Slice off any superfluous bytes, that is, ones that add no meaningful
+ // bits (because the value would be the same if they were removed).
+
+
+ while (byteLength > 1 && result[byteLength - 1] === signByte && (!signed || result[byteLength - 2] >> 7 === signBit)) {
+ byteLength--;
+ }
+
+ result = bufs.resize(result, byteLength);
+ return {
+ value: result,
+ nextIndex: index
+ };
+}
+/*
+ * Exported bindings
+ */
+
+
+function encodeIntBuffer(buffer) {
+ return encodeBufferCommon(buffer, true);
+}
+
+function decodeIntBuffer(encodedBuffer, index) {
+ return decodeBufferCommon(encodedBuffer, index, true);
+}
+
+function encodeInt32(num) {
+ var buf = bufs.alloc(4);
+ buf.writeInt32LE(num, 0);
+ var result = encodeIntBuffer(buf);
+ bufs.free(buf);
+ return result;
+}
+
+function decodeInt32(encodedBuffer, index) {
+ var result = decodeIntBuffer(encodedBuffer, index);
+ var parsed = bufs.readInt(result.value);
+ var value = parsed.value;
+ bufs.free(result.value);
+
+ if (value < MIN_INT32 || value > MAX_INT32) {
+ throw new Error("integer too large");
+ }
+
+ return {
+ value: value,
+ nextIndex: result.nextIndex
+ };
+}
+
+function encodeInt64(num) {
+ var buf = bufs.alloc(8);
+ bufs.writeInt64(num, buf);
+ var result = encodeIntBuffer(buf);
+ bufs.free(buf);
+ return result;
+}
+
+function decodeInt64(encodedBuffer, index) {
+ var result = decodeIntBuffer(encodedBuffer, index);
+ var value = Long.fromBytesLE(result.value, false);
+ bufs.free(result.value);
+ return {
+ value: value,
+ nextIndex: result.nextIndex,
+ lossy: false
+ };
+}
+
+function encodeUIntBuffer(buffer) {
+ return encodeBufferCommon(buffer, false);
+}
+
+function decodeUIntBuffer(encodedBuffer, index) {
+ return decodeBufferCommon(encodedBuffer, index, false);
+}
+
+function encodeUInt32(num) {
+ var buf = bufs.alloc(4);
+ buf.writeUInt32LE(num, 0);
+ var result = encodeUIntBuffer(buf);
+ bufs.free(buf);
+ return result;
+}
+
+function decodeUInt32(encodedBuffer, index) {
+ var result = decodeUIntBuffer(encodedBuffer, index);
+ var parsed = bufs.readUInt(result.value);
+ var value = parsed.value;
+ bufs.free(result.value);
+
+ if (value > MAX_UINT32) {
+ throw new Error("integer too large");
+ }
+
+ return {
+ value: value,
+ nextIndex: result.nextIndex
+ };
+}
+
+function encodeUInt64(num) {
+ var buf = bufs.alloc(8);
+ bufs.writeUInt64(num, buf);
+ var result = encodeUIntBuffer(buf);
+ bufs.free(buf);
+ return result;
+}
+
+function decodeUInt64(encodedBuffer, index) {
+ var result = decodeUIntBuffer(encodedBuffer, index);
+ var value = Long.fromBytesLE(result.value, true);
+ bufs.free(result.value);
+ return {
+ value: value,
+ nextIndex: result.nextIndex,
+ lossy: false
+ };
+}
+
+export default {
+ decodeInt32: decodeInt32,
+ decodeInt64: decodeInt64,
+ decodeIntBuffer: decodeIntBuffer,
+ decodeUInt32: decodeUInt32,
+ decodeUInt64: decodeUInt64,
+ decodeUIntBuffer: decodeUIntBuffer,
+ encodeInt32: encodeInt32,
+ encodeInt64: encodeInt64,
+ encodeIntBuffer: encodeIntBuffer,
+ encodeUInt32: encodeUInt32,
+ encodeUInt64: encodeUInt64,
+ encodeUIntBuffer: encodeUIntBuffer
+}; \ No newline at end of file