-var assert = require('assert');
-var SlowBuffer = require('./slow_buffer');
-
-exports.INSPECT_MAX_BYTES = 50;
-
-function coerce(length) {
- // Coerce length to a number (possibly NaN), round up
- // in case it's fractional (e.g. 123.456) then do a
- // double negate to coerce a NaN to 0. Easy, right?
- length = ~~Math.ceil(+length);
- return length < 0 ? 0 : length;
-}
+exports.Buffer = SlowBuffer;
+var Buffer = SlowBuffer;
-function toHex(n) {
- if (n < 16) return '0' + n.toString(16);
- return n.toString(16);
-}
-
-// Buffer
-
-function Buffer(subject, encoding, offset) {
- if (!(this instanceof Buffer)) {
- return new Buffer(subject, encoding, offset);
+function SlowBuffer(subject, encoding, offset) {
+ if (!(this instanceof SlowBuffer)) {
+ return new SlowBuffer(subject, encoding, offset);
}
var type;
// Are we slicing?
if (typeof offset === 'number') {
this.length = coerce(encoding);
- this.parent = subject;
this.offset = offset;
} else {
// Find the length
break;
case 'string':
- this.length = Buffer.byteLength(subject, encoding);
+ this.length = SlowBuffer.byteLength(subject, encoding);
break;
case 'object': // Assume object is an array
'array or string.');
}
- if (this.length > Buffer.poolSize) {
- // Big buffer, just alloc one.
- this.parent = new SlowBuffer(this.length);
- this.offset = 0;
-
- } else {
- // Small buffer.
- if (!pool || pool.length - pool.used < this.length) allocPool();
- this.parent = pool;
- this.offset = pool.used;
- pool.used += this.length;
- }
-
// Treat array-ish objects as a byte array.
if (isArrayIsh(subject)) {
for (var i = 0; i < this.length; i++) {
- if (subject instanceof Buffer) {
- this.parent[i + this.offset] = subject.readUInt8(i);
+ if (subject instanceof SlowBuffer) {
this[i] = subject.readUInt8(i);
}
else {
- this.parent[i + this.offset] = subject[i];
this[i] = subject[i];
}
}
} else if (type == 'string') {
// We are a string
this.length = this.write(subject, 0, encoding);
- for (var i = 0; i < this.length; i++) {
- this[i] = this.parent[i];
- }
}
}
-
}
-function isArrayIsh(subject) {
- return Array.isArray(subject) || Buffer.isBuffer(subject) ||
- subject && typeof subject === 'object' &&
- typeof subject.length === 'number';
+var assert = require('assert');
+
+exports.INSPECT_MAX_BYTES = 50;
+
+
+function toHex(n) {
+ if (n < 16) return '0' + n.toString(16);
+ return n.toString(16);
}
-exports.SlowBuffer = SlowBuffer;
-exports.Buffer = Buffer;
+function utf8ToBytes(str) {
+ var byteArray = [];
+ for (var i = 0; i < str.length; i++)
+ if (str.charCodeAt(i) <= 0x7F)
+ byteArray.push(str.charCodeAt(i));
+ else {
+ var h = encodeURIComponent(str.charAt(i)).substr(1).split('%');
+ for (var j = 0; j < h.length; j++)
+ byteArray.push(parseInt(h[j], 16));
+ }
+
+ return byteArray;
+}
-Buffer.poolSize = 8 * 1024;
-var pool;
+function asciiToBytes(str) {
+ var byteArray = []
+ for (var i = 0; i < str.length; i++ )
+ // Node's code seems to be doing this and not & 0x7F..
+ byteArray.push( str.charCodeAt(i) & 0xFF );
-function allocPool() {
- pool = new SlowBuffer(Buffer.poolSize);
- pool.used = 0;
+ return byteArray;
}
+function base64ToBytes(str) {
+ return require("base64-js").toByteArray(str);
+}
-// Static methods
-Buffer.isBuffer = function isBuffer(b) {
- return b instanceof Buffer || b instanceof SlowBuffer;
-};
+SlowBuffer.byteLength = function (str, encoding) {
+ switch (encoding || "utf8") {
+ case 'hex':
+ return str.length / 2;
-Buffer.concat = function (list, totalLength) {
- if (!Array.isArray(list)) {
- throw new Error("Usage: Buffer.concat(list, [totalLength])\n \
- list should be an Array.");
- }
+ case 'utf8':
+ case 'utf-8':
+ return utf8ToBytes(str).length;
- if (list.length === 0) {
- return new Buffer(0);
- } else if (list.length === 1) {
- return list[0];
- }
+ case 'ascii':
+ case 'binary':
+ return str.length;
- if (typeof totalLength !== 'number') {
- totalLength = 0;
- for (var i = 0; i < list.length; i++) {
- var buf = list[i];
- totalLength += buf.length;
- }
- }
+ case 'base64':
+ return base64ToBytes(str).length;
- var buffer = new Buffer(totalLength);
- var pos = 0;
- for (var i = 0; i < list.length; i++) {
- var buf = list[i];
- buf.copy(buffer, pos);
- pos += buf.length;
+ default:
+ throw new Error('Unknown encoding');
}
- return buffer;
};
-// Inspect
-Buffer.prototype.inspect = function inspect() {
- var out = [],
- len = this.length;
-
- for (var i = 0; i < len; i++) {
- out[i] = toHex(this.parent[i + this.offset]);
- if (i == exports.INSPECT_MAX_BYTES) {
- out[i + 1] = '...';
+function blitBuffer(src, dst, offset, length) {
+ var pos, i = 0;
+ while (i < length) {
+ if ((i+offset >= dst.length) || (i >= src.length))
break;
- }
+
+ dst[i + offset] = src[i];
+ i++;
}
+ return i;
+}
- return '<Buffer ' + out.join(' ') + '>';
+SlowBuffer.prototype.utf8Write = function (string, offset, length) {
+ var bytes, pos;
+ return SlowBuffer._charsWritten = blitBuffer(utf8ToBytes(string), this, offset, length);
};
-
-Buffer.prototype.get = function get(i) {
- if (i < 0 || i >= this.length) throw new Error('oob');
- return this.parent[this.offset + i];
+SlowBuffer.prototype.asciiWrite = function (string, offset, length) {
+ var bytes, pos;
+ return SlowBuffer._charsWritten = blitBuffer(asciiToBytes(string), this, offset, length);
};
+SlowBuffer.prototype.binaryWrite = SlowBuffer.prototype.asciiWrite;
-Buffer.prototype.set = function set(i, v) {
- if (i < 0 || i >= this.length) throw new Error('oob');
- return this.parent[this.offset + i] = v;
+SlowBuffer.prototype.base64Write = function (string, offset, length) {
+ var bytes, pos;
+ return SlowBuffer._charsWritten = blitBuffer(base64ToBytes(string), this, offset, length);
};
+SlowBuffer.prototype.base64Slice = function (start, end) {
+ var bytes = Array.prototype.slice.apply(this, arguments)
+ return require("base64-js").fromByteArray(bytes);
+}
-// write(string, offset = 0, length = buffer.length-offset, encoding = 'utf8')
-Buffer.prototype.write = function(string, offset, length, encoding) {
- // Support both (string, offset, length, encoding)
- // and the legacy (string, encoding, offset, length)
- if (isFinite(offset)) {
- if (!isFinite(length)) {
- encoding = length;
- length = undefined;
- }
- } else { // legacy
- var swap = encoding;
- encoding = offset;
- offset = length;
- length = swap;
+function decodeUtf8Char(str) {
+ try {
+ return decodeURIComponent(str);
+ } catch (err) {
+ return String.fromCharCode(0xFFFD); // UTF 8 invalid char
}
+}
- offset = +offset || 0;
- var remaining = this.length - offset;
- if (!length) {
- length = remaining;
- } else {
- length = +length;
- if (length > remaining) {
- length = remaining;
- }
+SlowBuffer.prototype.utf8Slice = function () {
+ var bytes = Array.prototype.slice.apply(this, arguments);
+ var res = "";
+ var tmp = "";
+ var i = 0;
+ while (i < bytes.length) {
+ if (bytes[i] <= 0x7F) {
+ res += decodeUtf8Char(tmp) + String.fromCharCode(bytes[i]);
+ tmp = "";
+ } else
+ tmp += "%" + bytes[i].toString(16);
+
+ i++;
}
- encoding = String(encoding || 'utf8').toLowerCase();
- var ret;
- switch (encoding) {
- case 'hex':
- ret = this.parent.hexWrite(string, this.offset + offset, length);
- break;
+ return res + decodeUtf8Char(tmp);
+}
- case 'utf8':
- case 'utf-8':
- ret = this.parent.utf8Write(string, this.offset + offset, length);
- break;
+SlowBuffer.prototype.asciiSlice = function () {
+ var bytes = Array.prototype.slice.apply(this, arguments);
+ var ret = "";
+ for (var i = 0; i < bytes.length; i++)
+ ret += String.fromCharCode(bytes[i]);
+ return ret;
+}
- case 'ascii':
- ret = this.parent.asciiWrite(string, this.offset + offset, length);
- break;
+SlowBuffer.prototype.binarySlice = SlowBuffer.prototype.asciiSlice;
- case 'binary':
- ret = this.parent.binaryWrite(string, this.offset + offset, length);
+SlowBuffer.prototype.inspect = function() {
+ var out = [],
+ len = this.length;
+ for (var i = 0; i < len; i++) {
+ out[i] = toHex(this[i]);
+ if (i == exports.INSPECT_MAX_BYTES) {
+ out[i + 1] = '...';
break;
+ }
+ }
+ return '<SlowBuffer ' + out.join(' ') + '>';
+};
- case 'base64':
- // Warning: maxLength not taken into account in base64Write
- ret = this.parent.base64Write(string, this.offset + offset, length);
- break;
- case 'ucs2':
- case 'ucs-2':
- ret = this.parent.ucs2Write(string, this.offset + offset, length);
- break;
+SlowBuffer.prototype.hexSlice = function(start, end) {
+ var len = this.length;
- default:
- throw new Error('Unknown encoding');
- }
-
- Buffer._charsWritten = SlowBuffer._charsWritten;
+ if (!start || start < 0) start = 0;
+ if (!end || end < 0 || end > len) end = len;
- return ret;
+ var out = '';
+ for (var i = start; i < end; i++) {
+ out += toHex(this[i]);
+ }
+ return out;
};
-// toString(encoding, start=0, end=buffer.length)
-Buffer.prototype.toString = function(encoding, start, end) {
+SlowBuffer.prototype.toString = function(encoding, start, end) {
encoding = String(encoding || 'utf8').toLowerCase();
+ start = +start || 0;
+ if (typeof end == 'undefined') end = this.length;
- if (typeof start == 'undefined' || start < 0) {
- start = 0;
- } else if (start > this.length) {
- start = this.length;
- }
-
- if (typeof end == 'undefined' || end > this.length) {
- end = this.length;
- } else if (end < 0) {
- end = 0;
+ // Fastpath empty strings
+ if (+end == start) {
+ return '';
}
- start = start + this.offset;
- end = end + this.offset;
-
switch (encoding) {
case 'hex':
- return this.parent.hexSlice(start, end);
+ return this.hexSlice(start, end);
case 'utf8':
case 'utf-8':
- return this.parent.utf8Slice(start, end);
+ return this.utf8Slice(start, end);
case 'ascii':
- return this.parent.asciiSlice(start, end);
+ return this.asciiSlice(start, end);
case 'binary':
- return this.parent.binarySlice(start, end);
+ return this.binarySlice(start, end);
case 'base64':
- return this.parent.base64Slice(start, end);
+ return this.base64Slice(start, end);
case 'ucs2':
case 'ucs-2':
- return this.parent.ucs2Slice(start, end);
+ return this.ucs2Slice(start, end);
default:
throw new Error('Unknown encoding');
};
-// byteLength
-Buffer.byteLength = SlowBuffer.byteLength;
-
-
-// fill(value, start=0, end=buffer.length)
-Buffer.prototype.fill = function fill(value, start, end) {
- value || (value = 0);
- start || (start = 0);
- end || (end = this.length);
-
- if (typeof value === 'string') {
- value = value.charCodeAt(0);
- }
- if (!(typeof value === 'number') || isNaN(value)) {
- throw new Error('value is not a number');
- }
-
- if (end < start) throw new Error('end < start');
-
- // Fill 0 bytes; we're done
- if (end === start) return 0;
- if (this.length == 0) return 0;
-
- if (start < 0 || start >= this.length) {
- throw new Error('start out of bounds');
- }
-
- if (end < 0 || end > this.length) {
- throw new Error('end out of bounds');
- }
-
- return this.parent.fill(value,
- start + this.offset,
- end + this.offset);
-};
-
-
-// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
-Buffer.prototype.copy = function(target, target_start, start, end) {
- var source = this;
- start || (start = 0);
- end || (end = this.length);
- target_start || (target_start = 0);
-
- if (end < start) throw new Error('sourceEnd < sourceStart');
-
- // Copy 0 bytes; we're done
- if (end === start) return 0;
- if (target.length == 0 || source.length == 0) return 0;
-
- if (target_start < 0 || target_start >= target.length) {
- throw new Error('targetStart out of bounds');
- }
-
- if (start < 0 || start >= source.length) {
- throw new Error('sourceStart out of bounds');
- }
-
- if (end < 0 || end > source.length) {
- throw new Error('sourceEnd out of bounds');
- }
-
- // Are we oob?
- if (end > this.length) {
- end = this.length;
- }
-
- if (target.length - target_start < end - start) {
- end = target.length - target_start + start;
- }
-
- return this.parent.copy(target.parent,
- target_start + target.offset,
- start + this.offset,
- end + this.offset);
-};
-
-
-// slice(start, end)
-Buffer.prototype.slice = function(start, end) {
- if (end === undefined) end = this.length;
- if (end > this.length) throw new Error('oob');
- if (start > end) throw new Error('oob');
-
- return new Buffer(this.parent, end - start, +start + this.offset);
-};
-
-
-// Legacy methods for backwards compatibility.
-
-Buffer.prototype.utf8Slice = function(start, end) {
- return this.toString('utf8', start, end);
-};
-
-Buffer.prototype.binarySlice = function(start, end) {
- return this.toString('binary', start, end);
-};
-
-Buffer.prototype.asciiSlice = function(start, end) {
- return this.toString('ascii', start, end);
-};
-
-Buffer.prototype.utf8Write = function(string, offset) {
- return this.write(string, offset, 'utf8');
-};
-
-Buffer.prototype.binaryWrite = function(string, offset) {
- return this.write(string, offset, 'binary');
-};
-
-Buffer.prototype.asciiWrite = function(string, offset) {
- return this.write(string, offset, 'ascii');
-};
-
-Buffer.prototype.readUInt8 = function(offset, noAssert) {
- var buffer = this;
-
- if (!noAssert) {
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset < buffer.length,
- 'Trying to read beyond buffer length');
- }
-
- if (offset >= buffer.length) return;
-
- return buffer.parent[buffer.offset + offset];
-};
-
-function readUInt16(buffer, offset, isBigEndian, noAssert) {
- var val = 0;
-
-
- if (!noAssert) {
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
-
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset + 1 < buffer.length,
- 'Trying to read beyond buffer length');
- }
-
- if (offset >= buffer.length) return 0;
-
- if (isBigEndian) {
- val = buffer.parent[buffer.offset + offset] << 8;
- if (offset + 1 < buffer.length) {
- val |= buffer.parent[buffer.offset + offset + 1];
- }
+SlowBuffer.prototype.hexWrite = function(string, offset, length) {
+ offset = +offset || 0;
+ var remaining = this.length - offset;
+ if (!length) {
+ length = remaining;
} else {
- val = buffer.parent[buffer.offset + offset];
- if (offset + 1 < buffer.length) {
- val |= buffer.parent[buffer.offset + offset + 1] << 8;
+ length = +length;
+ if (length > remaining) {
+ length = remaining;
}
}
- return val;
-}
-
-Buffer.prototype.readUInt16LE = function(offset, noAssert) {
- return readUInt16(this, offset, false, noAssert);
-};
-
-Buffer.prototype.readUInt16BE = function(offset, noAssert) {
- return readUInt16(this, offset, true, noAssert);
-};
-
-function readUInt32(buffer, offset, isBigEndian, noAssert) {
- var val = 0;
-
- if (!noAssert) {
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
-
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset + 3 < buffer.length,
- 'Trying to read beyond buffer length');
+ // must be an even number of digits
+ var strLen = string.length;
+ if (strLen % 2) {
+ throw new Error('Invalid hex string');
}
-
- if (offset >= buffer.length) return 0;
-
- if (isBigEndian) {
- if (offset + 1 < buffer.length)
- val = buffer.parent[buffer.offset + offset + 1] << 16;
- if (offset + 2 < buffer.length)
- val |= buffer.parent[buffer.offset + offset + 2] << 8;
- if (offset + 3 < buffer.length)
- val |= buffer.parent[buffer.offset + offset + 3];
- val = val + (buffer.parent[buffer.offset + offset] << 24 >>> 0);
- } else {
- if (offset + 2 < buffer.length)
- val = buffer.parent[buffer.offset + offset + 2] << 16;
- if (offset + 1 < buffer.length)
- val |= buffer.parent[buffer.offset + offset + 1] << 8;
- val |= buffer.parent[buffer.offset + offset];
- if (offset + 3 < buffer.length)
- val = val + (buffer.parent[buffer.offset + offset + 3] << 24 >>> 0);
+ if (length > strLen / 2) {
+ length = strLen / 2;
}
-
- return val;
-}
-
-Buffer.prototype.readUInt32LE = function(offset, noAssert) {
- return readUInt32(this, offset, false, noAssert);
-};
-
-Buffer.prototype.readUInt32BE = function(offset, noAssert) {
- return readUInt32(this, offset, true, noAssert);
-};
-
-
-/*
- * Signed integer types, yay team! A reminder on how two's complement actually
- * works. The first bit is the signed bit, i.e. tells us whether or not the
- * number should be positive or negative. If the two's complement value is
- * positive, then we're done, as it's equivalent to the unsigned representation.
- *
- * Now if the number is positive, you're pretty much done, you can just leverage
- * the unsigned translations and return those. Unfortunately, negative numbers
- * aren't quite that straightforward.
- *
- * At first glance, one might be inclined to use the traditional formula to
- * translate binary numbers between the positive and negative values in two's
- * complement. (Though it doesn't quite work for the most negative value)
- * Mainly:
- * - invert all the bits
- * - add one to the result
- *
- * Of course, this doesn't quite work in Javascript. Take for example the value
- * of -128. This could be represented in 16 bits (big-endian) as 0xff80. But of
- * course, Javascript will do the following:
- *
- * > ~0xff80
- * -65409
- *
- * Whoh there, Javascript, that's not quite right. But wait, according to
- * Javascript that's perfectly correct. When Javascript ends up seeing the
- * constant 0xff80, it has no notion that it is actually a signed number. It
- * assumes that we've input the unsigned value 0xff80. Thus, when it does the
- * binary negation, it casts it into a signed value, (positive 0xff80). Then
- * when you perform binary negation on that, it turns it into a negative number.
- *
- * Instead, we're going to have to use the following general formula, that works
- * in a rather Javascript friendly way. I'm glad we don't support this kind of
- * weird numbering scheme in the kernel.
- *
- * (BIT-MAX - (unsigned)val + 1) * -1
- *
- * The astute observer, may think that this doesn't make sense for 8-bit numbers
- * (really it isn't necessary for them). However, when you get 16-bit numbers,
- * you do. Let's go back to our prior example and see how this will look:
- *
- * (0xffff - 0xff80 + 1) * -1
- * (0x007f + 1) * -1
- * (0x0080) * -1
- */
-Buffer.prototype.readInt8 = function(offset, noAssert) {
- var buffer = this;
- var neg;
-
- if (!noAssert) {
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset < buffer.length,
- 'Trying to read beyond buffer length');
+ for (var i = 0; i < length; i++) {
+ var byte = parseInt(string.substr(i * 2, 2), 16);
+ if (isNaN(byte)) throw new Error('Invalid hex string');
+ this[offset + i] = byte;
}
-
- if (offset >= buffer.length) return;
-
- neg = buffer.parent[buffer.offset + offset] & 0x80;
- if (!neg) {
- return (buffer.parent[buffer.offset + offset]);
- }
-
- return ((0xff - buffer.parent[buffer.offset + offset] + 1) * -1);
+ SlowBuffer._charsWritten = i * 2;
+ return i;
};
-function readInt16(buffer, offset, isBigEndian, noAssert) {
- var neg, val;
-
- if (!noAssert) {
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset + 1 < buffer.length,
- 'Trying to read beyond buffer length');
+SlowBuffer.prototype.write = function(string, offset, length, encoding) {
+ // Support both (string, offset, length, encoding)
+ // and the legacy (string, encoding, offset, length)
+ if (isFinite(offset)) {
+ if (!isFinite(length)) {
+ encoding = length;
+ length = undefined;
+ }
+ } else { // legacy
+ var swap = encoding;
+ encoding = offset;
+ offset = length;
+ length = swap;
}
- val = readUInt16(buffer, offset, isBigEndian, noAssert);
- neg = val & 0x8000;
- if (!neg) {
- return val;
+ offset = +offset || 0;
+ var remaining = this.length - offset;
+ if (!length) {
+ length = remaining;
+ } else {
+ length = +length;
+ if (length > remaining) {
+ length = remaining;
+ }
}
+ encoding = String(encoding || 'utf8').toLowerCase();
- return (0xffff - val + 1) * -1;
-}
-
-Buffer.prototype.readInt16LE = function(offset, noAssert) {
- return readInt16(this, offset, false, noAssert);
-};
+ switch (encoding) {
+ case 'hex':
+ return this.hexWrite(string, offset, length);
-Buffer.prototype.readInt16BE = function(offset, noAssert) {
- return readInt16(this, offset, true, noAssert);
-};
+ case 'utf8':
+ case 'utf-8':
+ return this.utf8Write(string, offset, length);
-function readInt32(buffer, offset, isBigEndian, noAssert) {
- var neg, val;
+ case 'ascii':
+ return this.asciiWrite(string, offset, length);
- if (!noAssert) {
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
+ case 'binary':
+ return this.binaryWrite(string, offset, length);
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
+ case 'base64':
+ return this.base64Write(string, offset, length);
- assert.ok(offset + 3 < buffer.length,
- 'Trying to read beyond buffer length');
- }
+ case 'ucs2':
+ case 'ucs-2':
+ return this.ucs2Write(string, offset, length);
- val = readUInt32(buffer, offset, isBigEndian, noAssert);
- neg = val & 0x80000000;
- if (!neg) {
- return (val);
+ default:
+ throw new Error('Unknown encoding');
}
-
- return (0xffffffff - val + 1) * -1;
-}
-
-Buffer.prototype.readInt32LE = function(offset, noAssert) {
- return readInt32(this, offset, false, noAssert);
};
-Buffer.prototype.readInt32BE = function(offset, noAssert) {
- return readInt32(this, offset, true, noAssert);
-};
-function readFloat(buffer, offset, isBigEndian, noAssert) {
- if (!noAssert) {
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
+// slice(start, end)
+SlowBuffer.prototype.slice = function(start, end) {
+ if (end === undefined) end = this.length;
- assert.ok(offset + 3 < buffer.length,
- 'Trying to read beyond buffer length');
+ if (end > this.length) {
+ throw new Error('oob');
}
-
- return require('./buffer_ieee754').readIEEE754(buffer, offset, isBigEndian,
- 23, 4);
-}
-
-Buffer.prototype.readFloatLE = function(offset, noAssert) {
- return readFloat(this, offset, false, noAssert);
-};
-
-Buffer.prototype.readFloatBE = function(offset, noAssert) {
- return readFloat(this, offset, true, noAssert);
-};
-
-function readDouble(buffer, offset, isBigEndian, noAssert) {
- if (!noAssert) {
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
-
- assert.ok(offset + 7 < buffer.length,
- 'Trying to read beyond buffer length');
+ if (start > end) {
+ throw new Error('oob');
}
- return require('./buffer_ieee754').readIEEE754(buffer, offset, isBigEndian,
- 52, 8);
-}
-
-Buffer.prototype.readDoubleLE = function(offset, noAssert) {
- return readDouble(this, offset, false, noAssert);
-};
-
-Buffer.prototype.readDoubleBE = function(offset, noAssert) {
- return readDouble(this, offset, true, noAssert);
+ return new Buffer(this, end - start, +start);
};
-
-/*
- * We have to make sure that the value is a valid integer. This means that it is
- * non-negative. It has no fractional component and that it does not exceed the
- * maximum allowed value.
- *
- * value The number to check for validity
- *
- * max The maximum value
- */
-function verifuint(value, max) {
- assert.ok(typeof (value) == 'number',
- 'cannot write a non-number as a number');
-
- assert.ok(value >= 0,
- 'specified a negative value for writing an unsigned value');
-
- assert.ok(value <= max, 'value is larger than maximum value for type');
-
- assert.ok(Math.floor(value) === value, 'value has a fractional component');
-}
-
-Buffer.prototype.writeUInt8 = function(value, offset, noAssert) {
- var buffer = this;
-
- if (!noAssert) {
- assert.ok(value !== undefined && value !== null,
- 'missing value');
-
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset < buffer.length,
- 'trying to write beyond buffer length');
-
- verifuint(value, 0xff);
+SlowBuffer.prototype.copy = function(target, targetstart, sourcestart, sourceend) {
+ var temp = [];
+ for (var i=sourcestart; i<sourceend; i++) {
+ assert.ok(typeof this[i] !== 'undefined', "copying undefined buffer bytes!");
+ temp.push(this[i]);
}
- if (offset < buffer.length) {
- buffer.parent[buffer.offset + offset] = value;
+ for (var i=targetstart; i<targetstart+temp.length; i++) {
+ target[i] = temp[i-targetstart];
}
};
-function writeUInt16(buffer, value, offset, isBigEndian, noAssert) {
- if (!noAssert) {
- assert.ok(value !== undefined && value !== null,
- 'missing value');
-
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
-
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset + 1 < buffer.length,
- 'trying to write beyond buffer length');
-
- verifuint(value, 0xffff);
- }
-
- for (var i = 0; i < Math.min(buffer.length - offset, 2); i++) {
- buffer.parent[buffer.offset + offset + i] =
- (value & (0xff << (8 * (isBigEndian ? 1 - i : i)))) >>>
- (isBigEndian ? 1 - i : i) * 8;
+SlowBuffer.prototype.fill = function(value, start, end) {
+ if (end > this.length) {
+ throw new Error('oob');
}
-
-}
-
-Buffer.prototype.writeUInt16LE = function(value, offset, noAssert) {
- writeUInt16(this, value, offset, false, noAssert);
-};
-
-Buffer.prototype.writeUInt16BE = function(value, offset, noAssert) {
- writeUInt16(this, value, offset, true, noAssert);
-};
-
-function writeUInt32(buffer, value, offset, isBigEndian, noAssert) {
- if (!noAssert) {
- assert.ok(value !== undefined && value !== null,
- 'missing value');
-
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
-
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset + 3 < buffer.length,
- 'trying to write beyond buffer length');
-
- verifuint(value, 0xffffffff);
+ if (start > end) {
+ throw new Error('oob');
}
- for (var i = 0; i < Math.min(buffer.length - offset, 4); i++) {
- buffer.parent[buffer.offset + offset + i] =
- (value >>> (isBigEndian ? 3 - i : i) * 8) & 0xff;
+ for (var i = start; i < end; i++) {
+ this[i] = value;
}
}
-Buffer.prototype.writeUInt32LE = function(value, offset, noAssert) {
- writeUInt32(this, value, offset, false, noAssert);
-};
-
-Buffer.prototype.writeUInt32BE = function(value, offset, noAssert) {
- writeUInt32(this, value, offset, true, noAssert);
-};
-
-
-/*
- * We now move onto our friends in the signed number category. Unlike unsigned
- * numbers, we're going to have to worry a bit more about how we put values into
- * arrays. Since we are only worrying about signed 32-bit values, we're in
- * slightly better shape. Unfortunately, we really can't do our favorite binary
- * & in this system. It really seems to do the wrong thing. For example:
- *
- * > -32 & 0xff
- * 224
- *
- * What's happening above is really: 0xe0 & 0xff = 0xe0. However, the results of
- * this aren't treated as a signed number. Ultimately a bad thing.
- *
- * What we're going to want to do is basically create the unsigned equivalent of
- * our representation and pass that off to the wuint* functions. To do that
- * we're going to do the following:
- *
- * - if the value is positive
- * we can pass it directly off to the equivalent wuint
- * - if the value is negative
- * we do the following computation:
- * mb + val + 1, where
- * mb is the maximum unsigned value in that byte size
- * val is the Javascript negative integer
- *
- *
- * As a concrete value, take -128. In signed 16 bits this would be 0xff80. If
- * you do out the computations:
- *
- * 0xffff - 128 + 1
- * 0xffff - 127
- * 0xff80
- *
- * You can then encode this value as the signed version. This is really rather
- * hacky, but it should work and get the job done which is our goal here.
- */
-
-/*
- * A series of checks to make sure we actually have a signed 32-bit number
- */
-function verifsint(value, max, min) {
- assert.ok(typeof (value) == 'number',
- 'cannot write a non-number as a number');
-
- assert.ok(value <= max, 'value larger than maximum allowed value');
-
- assert.ok(value >= min, 'value smaller than minimum allowed value');
-
- assert.ok(Math.floor(value) === value, 'value has a fractional component');
-}
-
-function verifIEEE754(value, max, min) {
- assert.ok(typeof (value) == 'number',
- 'cannot write a non-number as a number');
-
- assert.ok(value <= max, 'value larger than maximum allowed value');
-
- assert.ok(value >= min, 'value smaller than minimum allowed value');
-}
-
-Buffer.prototype.writeInt8 = function(value, offset, noAssert) {
- var buffer = this;
-
- if (!noAssert) {
- assert.ok(value !== undefined && value !== null,
- 'missing value');
-
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset < buffer.length,
- 'Trying to write beyond buffer length');
-
- verifsint(value, 0x7f, -0x80);
- }
-
- if (value >= 0) {
- buffer.writeUInt8(value, offset, noAssert);
- } else {
- buffer.writeUInt8(0xff + value + 1, offset, noAssert);
- }
+// Static methods
+Buffer.isBuffer = function isBuffer(b) {
+ return b instanceof Buffer || b instanceof SlowBuffer;
};
-function writeInt16(buffer, value, offset, isBigEndian, noAssert) {
- if (!noAssert) {
- assert.ok(value !== undefined && value !== null,
- 'missing value');
-
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
-
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset + 1 < buffer.length,
- 'Trying to write beyond buffer length');
-
- verifsint(value, 0x7fff, -0x8000);
+Buffer.concat = function (list, totalLength) {
+ if (!Array.isArray(list)) {
+ throw new Error("Usage: Buffer.concat(list, [totalLength])\n \
+ list should be an Array.");
}
- if (value >= 0) {
- writeUInt16(buffer, value, offset, isBigEndian, noAssert);
- } else {
- writeUInt16(buffer, 0xffff + value + 1, offset, isBigEndian, noAssert);
+ if (list.length === 0) {
+ return new Buffer(0);
+ } else if (list.length === 1) {
+ return list[0];
}
-}
-
-Buffer.prototype.writeInt16LE = function(value, offset, noAssert) {
- writeInt16(this, value, offset, false, noAssert);
-};
-
-Buffer.prototype.writeInt16BE = function(value, offset, noAssert) {
- writeInt16(this, value, offset, true, noAssert);
-};
-function writeInt32(buffer, value, offset, isBigEndian, noAssert) {
- if (!noAssert) {
- assert.ok(value !== undefined && value !== null,
- 'missing value');
-
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
-
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset + 3 < buffer.length,
- 'Trying to write beyond buffer length');
-
- verifsint(value, 0x7fffffff, -0x80000000);
+ if (typeof totalLength !== 'number') {
+ totalLength = 0;
+ for (var i = 0; i < list.length; i++) {
+ var buf = list[i];
+ totalLength += buf.length;
+ }
}
- if (value >= 0) {
- writeUInt32(buffer, value, offset, isBigEndian, noAssert);
- } else {
- writeUInt32(buffer, 0xffffffff + value + 1, offset, isBigEndian, noAssert);
+ var buffer = new Buffer(totalLength);
+ var pos = 0;
+ for (var i = 0; i < list.length; i++) {
+ var buf = list[i];
+ buf.copy(buffer, pos);
+ pos += buf.length;
}
-}
-
-Buffer.prototype.writeInt32LE = function(value, offset, noAssert) {
- writeInt32(this, value, offset, false, noAssert);
-};
-
-Buffer.prototype.writeInt32BE = function(value, offset, noAssert) {
- writeInt32(this, value, offset, true, noAssert);
+ return buffer;
};
-function writeFloat(buffer, value, offset, isBigEndian, noAssert) {
- if (!noAssert) {
- assert.ok(value !== undefined && value !== null,
- 'missing value');
-
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
-
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset + 3 < buffer.length,
- 'Trying to write beyond buffer length');
-
- verifIEEE754(value, 3.4028234663852886e+38, -3.4028234663852886e+38);
- }
+// helpers
- require('./buffer_ieee754').writeIEEE754(buffer, value, offset, isBigEndian,
- 23, 4);
+function coerce(length) {
+ // Coerce length to a number (possibly NaN), round up
+ // in case it's fractional (e.g. 123.456) then do a
+ // double negate to coerce a NaN to 0. Easy, right?
+ length = ~~Math.ceil(+length);
+ return length < 0 ? 0 : length;
}
-Buffer.prototype.writeFloatLE = function(value, offset, noAssert) {
- writeFloat(this, value, offset, false, noAssert);
-};
-
-Buffer.prototype.writeFloatBE = function(value, offset, noAssert) {
- writeFloat(this, value, offset, true, noAssert);
-};
-
-function writeDouble(buffer, value, offset, isBigEndian, noAssert) {
- if (!noAssert) {
- assert.ok(value !== undefined && value !== null,
- 'missing value');
-
- assert.ok(typeof (isBigEndian) === 'boolean',
- 'missing or invalid endian');
-
- assert.ok(offset !== undefined && offset !== null,
- 'missing offset');
-
- assert.ok(offset + 7 < buffer.length,
- 'Trying to write beyond buffer length');
-
- verifIEEE754(value, 1.7976931348623157E+308, -1.7976931348623157E+308);
- }
-
- require('./buffer_ieee754').writeIEEE754(buffer, value, offset, isBigEndian,
- 52, 8);
+function isArrayIsh(subject) {
+ return Array.isArray(subject) || Buffer.isBuffer(subject) ||
+ subject && typeof subject === 'object' &&
+ typeof subject.length === 'number';
}
-
-Buffer.prototype.writeDoubleLE = function(value, offset, noAssert) {
- writeDouble(this, value, offset, false, noAssert);
-};
-
-Buffer.prototype.writeDoubleBE = function(value, offset, noAssert) {
- writeDouble(this, value, offset, true, noAssert);
-};
-
-SlowBuffer.prototype.readUInt8 = Buffer.prototype.readUInt8;
-SlowBuffer.prototype.readUInt16LE = Buffer.prototype.readUInt16LE;
-SlowBuffer.prototype.readUInt16BE = Buffer.prototype.readUInt16BE;
-SlowBuffer.prototype.readUInt32LE = Buffer.prototype.readUInt32LE;
-SlowBuffer.prototype.readUInt32BE = Buffer.prototype.readUInt32BE;
-SlowBuffer.prototype.readInt8 = Buffer.prototype.readInt8;
-SlowBuffer.prototype.readInt16LE = Buffer.prototype.readInt16LE;
-SlowBuffer.prototype.readInt16BE = Buffer.prototype.readInt16BE;
-SlowBuffer.prototype.readInt32LE = Buffer.prototype.readInt32LE;
-SlowBuffer.prototype.readInt32BE = Buffer.prototype.readInt32BE;
-SlowBuffer.prototype.readFloatLE = Buffer.prototype.readFloatLE;
-SlowBuffer.prototype.readFloatBE = Buffer.prototype.readFloatBE;
-SlowBuffer.prototype.readDoubleLE = Buffer.prototype.readDoubleLE;
-SlowBuffer.prototype.readDoubleBE = Buffer.prototype.readDoubleBE;
-SlowBuffer.prototype.writeUInt8 = Buffer.prototype.writeUInt8;
-SlowBuffer.prototype.writeUInt16LE = Buffer.prototype.writeUInt16LE;
-SlowBuffer.prototype.writeUInt16BE = Buffer.prototype.writeUInt16BE;
-SlowBuffer.prototype.writeUInt32LE = Buffer.prototype.writeUInt32LE;
-SlowBuffer.prototype.writeUInt32BE = Buffer.prototype.writeUInt32BE;
-SlowBuffer.prototype.writeInt8 = Buffer.prototype.writeInt8;
-SlowBuffer.prototype.writeInt16LE = Buffer.prototype.writeInt16LE;
-SlowBuffer.prototype.writeInt16BE = Buffer.prototype.writeInt16BE;
-SlowBuffer.prototype.writeInt32LE = Buffer.prototype.writeInt32LE;
-SlowBuffer.prototype.writeInt32BE = Buffer.prototype.writeInt32BE;
-SlowBuffer.prototype.writeFloatLE = Buffer.prototype.writeFloatLE;
-SlowBuffer.prototype.writeFloatBE = Buffer.prototype.writeFloatBE;
-SlowBuffer.prototype.writeDoubleLE = Buffer.prototype.writeDoubleLE;
-SlowBuffer.prototype.writeDoubleBE = Buffer.prototype.writeDoubleBE;
--- /dev/null
+var assert = require('assert');
+var SlowBuffer = require('./slow_buffer');
+
+exports.INSPECT_MAX_BYTES = 50;
+
+function coerce(length) {
+ // Coerce length to a number (possibly NaN), round up
+ // in case it's fractional (e.g. 123.456) then do a
+ // double negate to coerce a NaN to 0. Easy, right?
+ length = ~~Math.ceil(+length);
+ return length < 0 ? 0 : length;
+}
+
+function toHex(n) {
+ if (n < 16) return '0' + n.toString(16);
+ return n.toString(16);
+}
+
+// Buffer
+
+function Buffer(subject, encoding, offset) {
+ if (!(this instanceof Buffer)) {
+ return new Buffer(subject, encoding, offset);
+ }
+
+ var type;
+
+ // Are we slicing?
+ if (typeof offset === 'number') {
+ this.length = coerce(encoding);
+ this.parent = subject;
+ this.offset = offset;
+ } else {
+ // Find the length
+ switch (type = typeof subject) {
+ case 'number':
+ this.length = coerce(subject);
+ break;
+
+ case 'string':
+ this.length = Buffer.byteLength(subject, encoding);
+ break;
+
+ case 'object': // Assume object is an array
+ this.length = coerce(subject.length);
+ break;
+
+ default:
+ throw new Error('First argument needs to be a number, ' +
+ 'array or string.');
+ }
+
+ if (this.length > Buffer.poolSize) {
+ // Big buffer, just alloc one.
+ this.parent = new SlowBuffer(this.length);
+ this.offset = 0;
+
+ } else {
+ // Small buffer.
+ if (!pool || pool.length - pool.used < this.length) allocPool();
+ this.parent = pool;
+ this.offset = pool.used;
+ pool.used += this.length;
+ }
+
+ // Treat array-ish objects as a byte array.
+ if (isArrayIsh(subject)) {
+ for (var i = 0; i < this.length; i++) {
+ if (subject instanceof Buffer) {
+ this.parent[i + this.offset] = subject.readUInt8(i);
+ this[i] = subject.readUInt8(i);
+ }
+ else {
+ this.parent[i + this.offset] = subject[i];
+ this[i] = subject[i];
+ }
+ }
+ } else if (type == 'string') {
+ // We are a string
+ this.length = this.write(subject, 0, encoding);
+ for (var i = 0; i < this.length; i++) {
+ this[i] = this.parent[i];
+ }
+ }
+ }
+
+}
+
+function isArrayIsh(subject) {
+ return Array.isArray(subject) || Buffer.isBuffer(subject) ||
+ subject && typeof subject === 'object' &&
+ typeof subject.length === 'number';
+}
+
+exports.SlowBuffer = SlowBuffer;
+exports.Buffer = Buffer;
+
+Buffer.poolSize = 8 * 1024;
+var pool;
+
+function allocPool() {
+ pool = new SlowBuffer(Buffer.poolSize);
+ pool.used = 0;
+}
+
+
+// Static methods
+Buffer.isBuffer = function isBuffer(b) {
+ return b instanceof Buffer || b instanceof SlowBuffer;
+};
+
+Buffer.concat = function (list, totalLength) {
+ if (!Array.isArray(list)) {
+ throw new Error("Usage: Buffer.concat(list, [totalLength])\n \
+ list should be an Array.");
+ }
+
+ if (list.length === 0) {
+ return new Buffer(0);
+ } else if (list.length === 1) {
+ return list[0];
+ }
+
+ if (typeof totalLength !== 'number') {
+ totalLength = 0;
+ for (var i = 0; i < list.length; i++) {
+ var buf = list[i];
+ totalLength += buf.length;
+ }
+ }
+
+ var buffer = new Buffer(totalLength);
+ var pos = 0;
+ for (var i = 0; i < list.length; i++) {
+ var buf = list[i];
+ buf.copy(buffer, pos);
+ pos += buf.length;
+ }
+ return buffer;
+};
+
+// Inspect
+Buffer.prototype.inspect = function inspect() {
+ var out = [],
+ len = this.length;
+
+ for (var i = 0; i < len; i++) {
+ out[i] = toHex(this.parent[i + this.offset]);
+ if (i == exports.INSPECT_MAX_BYTES) {
+ out[i + 1] = '...';
+ break;
+ }
+ }
+
+ return '<Buffer ' + out.join(' ') + '>';
+};
+
+
+Buffer.prototype.get = function get(i) {
+ if (i < 0 || i >= this.length) throw new Error('oob');
+ return this.parent[this.offset + i];
+};
+
+
+Buffer.prototype.set = function set(i, v) {
+ if (i < 0 || i >= this.length) throw new Error('oob');
+ return this.parent[this.offset + i] = v;
+};
+
+
+// write(string, offset = 0, length = buffer.length-offset, encoding = 'utf8')
+Buffer.prototype.write = function(string, offset, length, encoding) {
+ // Support both (string, offset, length, encoding)
+ // and the legacy (string, encoding, offset, length)
+ if (isFinite(offset)) {
+ if (!isFinite(length)) {
+ encoding = length;
+ length = undefined;
+ }
+ } else { // legacy
+ var swap = encoding;
+ encoding = offset;
+ offset = length;
+ length = swap;
+ }
+
+ offset = +offset || 0;
+ var remaining = this.length - offset;
+ if (!length) {
+ length = remaining;
+ } else {
+ length = +length;
+ if (length > remaining) {
+ length = remaining;
+ }
+ }
+ encoding = String(encoding || 'utf8').toLowerCase();
+
+ var ret;
+ switch (encoding) {
+ case 'hex':
+ ret = this.parent.hexWrite(string, this.offset + offset, length);
+ break;
+
+ case 'utf8':
+ case 'utf-8':
+ ret = this.parent.utf8Write(string, this.offset + offset, length);
+ break;
+
+ case 'ascii':
+ ret = this.parent.asciiWrite(string, this.offset + offset, length);
+ break;
+
+ case 'binary':
+ ret = this.parent.binaryWrite(string, this.offset + offset, length);
+ break;
+
+ case 'base64':
+ // Warning: maxLength not taken into account in base64Write
+ ret = this.parent.base64Write(string, this.offset + offset, length);
+ break;
+
+ case 'ucs2':
+ case 'ucs-2':
+ ret = this.parent.ucs2Write(string, this.offset + offset, length);
+ break;
+
+ default:
+ throw new Error('Unknown encoding');
+ }
+
+ Buffer._charsWritten = SlowBuffer._charsWritten;
+
+ return ret;
+};
+
+
+// toString(encoding, start=0, end=buffer.length)
+Buffer.prototype.toString = function(encoding, start, end) {
+ encoding = String(encoding || 'utf8').toLowerCase();
+
+ if (typeof start == 'undefined' || start < 0) {
+ start = 0;
+ } else if (start > this.length) {
+ start = this.length;
+ }
+
+ if (typeof end == 'undefined' || end > this.length) {
+ end = this.length;
+ } else if (end < 0) {
+ end = 0;
+ }
+
+ start = start + this.offset;
+ end = end + this.offset;
+
+ switch (encoding) {
+ case 'hex':
+ return this.parent.hexSlice(start, end);
+
+ case 'utf8':
+ case 'utf-8':
+ return this.parent.utf8Slice(start, end);
+
+ case 'ascii':
+ return this.parent.asciiSlice(start, end);
+
+ case 'binary':
+ return this.parent.binarySlice(start, end);
+
+ case 'base64':
+ return this.parent.base64Slice(start, end);
+
+ case 'ucs2':
+ case 'ucs-2':
+ return this.parent.ucs2Slice(start, end);
+
+ default:
+ throw new Error('Unknown encoding');
+ }
+};
+
+
+// byteLength
+Buffer.byteLength = SlowBuffer.byteLength;
+
+
+// fill(value, start=0, end=buffer.length)
+Buffer.prototype.fill = function fill(value, start, end) {
+ value || (value = 0);
+ start || (start = 0);
+ end || (end = this.length);
+
+ if (typeof value === 'string') {
+ value = value.charCodeAt(0);
+ }
+ if (!(typeof value === 'number') || isNaN(value)) {
+ throw new Error('value is not a number');
+ }
+
+ if (end < start) throw new Error('end < start');
+
+ // Fill 0 bytes; we're done
+ if (end === start) return 0;
+ if (this.length == 0) return 0;
+
+ if (start < 0 || start >= this.length) {
+ throw new Error('start out of bounds');
+ }
+
+ if (end < 0 || end > this.length) {
+ throw new Error('end out of bounds');
+ }
+
+ return this.parent.fill(value,
+ start + this.offset,
+ end + this.offset);
+};
+
+
+// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
+Buffer.prototype.copy = function(target, target_start, start, end) {
+ var source = this;
+ start || (start = 0);
+ end || (end = this.length);
+ target_start || (target_start = 0);
+
+ if (end < start) throw new Error('sourceEnd < sourceStart');
+
+ // Copy 0 bytes; we're done
+ if (end === start) return 0;
+ if (target.length == 0 || source.length == 0) return 0;
+
+ if (target_start < 0 || target_start >= target.length) {
+ throw new Error('targetStart out of bounds');
+ }
+
+ if (start < 0 || start >= source.length) {
+ throw new Error('sourceStart out of bounds');
+ }
+
+ if (end < 0 || end > source.length) {
+ throw new Error('sourceEnd out of bounds');
+ }
+
+ // Are we oob?
+ if (end > this.length) {
+ end = this.length;
+ }
+
+ if (target.length - target_start < end - start) {
+ end = target.length - target_start + start;
+ }
+
+ return this.parent.copy(target.parent,
+ target_start + target.offset,
+ start + this.offset,
+ end + this.offset);
+};
+
+
+// slice(start, end)
+Buffer.prototype.slice = function(start, end) {
+ if (end === undefined) end = this.length;
+ if (end > this.length) throw new Error('oob');
+ if (start > end) throw new Error('oob');
+
+ return new Buffer(this.parent, end - start, +start + this.offset);
+};
+
+
+// Legacy methods for backwards compatibility.
+
+Buffer.prototype.utf8Slice = function(start, end) {
+ return this.toString('utf8', start, end);
+};
+
+Buffer.prototype.binarySlice = function(start, end) {
+ return this.toString('binary', start, end);
+};
+
+Buffer.prototype.asciiSlice = function(start, end) {
+ return this.toString('ascii', start, end);
+};
+
+Buffer.prototype.utf8Write = function(string, offset) {
+ return this.write(string, offset, 'utf8');
+};
+
+Buffer.prototype.binaryWrite = function(string, offset) {
+ return this.write(string, offset, 'binary');
+};
+
+Buffer.prototype.asciiWrite = function(string, offset) {
+ return this.write(string, offset, 'ascii');
+};
+
+Buffer.prototype.readUInt8 = function(offset, noAssert) {
+ var buffer = this;
+
+ if (!noAssert) {
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset < buffer.length,
+ 'Trying to read beyond buffer length');
+ }
+
+ if (offset >= buffer.length) return;
+
+ return buffer.parent[buffer.offset + offset];
+};
+
+function readUInt16(buffer, offset, isBigEndian, noAssert) {
+ var val = 0;
+
+
+ if (!noAssert) {
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset + 1 < buffer.length,
+ 'Trying to read beyond buffer length');
+ }
+
+ if (offset >= buffer.length) return 0;
+
+ if (isBigEndian) {
+ val = buffer.parent[buffer.offset + offset] << 8;
+ if (offset + 1 < buffer.length) {
+ val |= buffer.parent[buffer.offset + offset + 1];
+ }
+ } else {
+ val = buffer.parent[buffer.offset + offset];
+ if (offset + 1 < buffer.length) {
+ val |= buffer.parent[buffer.offset + offset + 1] << 8;
+ }
+ }
+
+ return val;
+}
+
+Buffer.prototype.readUInt16LE = function(offset, noAssert) {
+ return readUInt16(this, offset, false, noAssert);
+};
+
+Buffer.prototype.readUInt16BE = function(offset, noAssert) {
+ return readUInt16(this, offset, true, noAssert);
+};
+
+function readUInt32(buffer, offset, isBigEndian, noAssert) {
+ var val = 0;
+
+ if (!noAssert) {
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset + 3 < buffer.length,
+ 'Trying to read beyond buffer length');
+ }
+
+ if (offset >= buffer.length) return 0;
+
+ if (isBigEndian) {
+ if (offset + 1 < buffer.length)
+ val = buffer.parent[buffer.offset + offset + 1] << 16;
+ if (offset + 2 < buffer.length)
+ val |= buffer.parent[buffer.offset + offset + 2] << 8;
+ if (offset + 3 < buffer.length)
+ val |= buffer.parent[buffer.offset + offset + 3];
+ val = val + (buffer.parent[buffer.offset + offset] << 24 >>> 0);
+ } else {
+ if (offset + 2 < buffer.length)
+ val = buffer.parent[buffer.offset + offset + 2] << 16;
+ if (offset + 1 < buffer.length)
+ val |= buffer.parent[buffer.offset + offset + 1] << 8;
+ val |= buffer.parent[buffer.offset + offset];
+ if (offset + 3 < buffer.length)
+ val = val + (buffer.parent[buffer.offset + offset + 3] << 24 >>> 0);
+ }
+
+ return val;
+}
+
+Buffer.prototype.readUInt32LE = function(offset, noAssert) {
+ return readUInt32(this, offset, false, noAssert);
+};
+
+Buffer.prototype.readUInt32BE = function(offset, noAssert) {
+ return readUInt32(this, offset, true, noAssert);
+};
+
+
+/*
+ * Signed integer types, yay team! A reminder on how two's complement actually
+ * works. The first bit is the signed bit, i.e. tells us whether or not the
+ * number should be positive or negative. If the two's complement value is
+ * positive, then we're done, as it's equivalent to the unsigned representation.
+ *
+ * Now if the number is positive, you're pretty much done, you can just leverage
+ * the unsigned translations and return those. Unfortunately, negative numbers
+ * aren't quite that straightforward.
+ *
+ * At first glance, one might be inclined to use the traditional formula to
+ * translate binary numbers between the positive and negative values in two's
+ * complement. (Though it doesn't quite work for the most negative value)
+ * Mainly:
+ * - invert all the bits
+ * - add one to the result
+ *
+ * Of course, this doesn't quite work in Javascript. Take for example the value
+ * of -128. This could be represented in 16 bits (big-endian) as 0xff80. But of
+ * course, Javascript will do the following:
+ *
+ * > ~0xff80
+ * -65409
+ *
+ * Whoh there, Javascript, that's not quite right. But wait, according to
+ * Javascript that's perfectly correct. When Javascript ends up seeing the
+ * constant 0xff80, it has no notion that it is actually a signed number. It
+ * assumes that we've input the unsigned value 0xff80. Thus, when it does the
+ * binary negation, it casts it into a signed value, (positive 0xff80). Then
+ * when you perform binary negation on that, it turns it into a negative number.
+ *
+ * Instead, we're going to have to use the following general formula, that works
+ * in a rather Javascript friendly way. I'm glad we don't support this kind of
+ * weird numbering scheme in the kernel.
+ *
+ * (BIT-MAX - (unsigned)val + 1) * -1
+ *
+ * The astute observer, may think that this doesn't make sense for 8-bit numbers
+ * (really it isn't necessary for them). However, when you get 16-bit numbers,
+ * you do. Let's go back to our prior example and see how this will look:
+ *
+ * (0xffff - 0xff80 + 1) * -1
+ * (0x007f + 1) * -1
+ * (0x0080) * -1
+ */
+Buffer.prototype.readInt8 = function(offset, noAssert) {
+ var buffer = this;
+ var neg;
+
+ if (!noAssert) {
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset < buffer.length,
+ 'Trying to read beyond buffer length');
+ }
+
+ if (offset >= buffer.length) return;
+
+ neg = buffer.parent[buffer.offset + offset] & 0x80;
+ if (!neg) {
+ return (buffer.parent[buffer.offset + offset]);
+ }
+
+ return ((0xff - buffer.parent[buffer.offset + offset] + 1) * -1);
+};
+
+function readInt16(buffer, offset, isBigEndian, noAssert) {
+ var neg, val;
+
+ if (!noAssert) {
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset + 1 < buffer.length,
+ 'Trying to read beyond buffer length');
+ }
+
+ val = readUInt16(buffer, offset, isBigEndian, noAssert);
+ neg = val & 0x8000;
+ if (!neg) {
+ return val;
+ }
+
+ return (0xffff - val + 1) * -1;
+}
+
+Buffer.prototype.readInt16LE = function(offset, noAssert) {
+ return readInt16(this, offset, false, noAssert);
+};
+
+Buffer.prototype.readInt16BE = function(offset, noAssert) {
+ return readInt16(this, offset, true, noAssert);
+};
+
+function readInt32(buffer, offset, isBigEndian, noAssert) {
+ var neg, val;
+
+ if (!noAssert) {
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset + 3 < buffer.length,
+ 'Trying to read beyond buffer length');
+ }
+
+ val = readUInt32(buffer, offset, isBigEndian, noAssert);
+ neg = val & 0x80000000;
+ if (!neg) {
+ return (val);
+ }
+
+ return (0xffffffff - val + 1) * -1;
+}
+
+Buffer.prototype.readInt32LE = function(offset, noAssert) {
+ return readInt32(this, offset, false, noAssert);
+};
+
+Buffer.prototype.readInt32BE = function(offset, noAssert) {
+ return readInt32(this, offset, true, noAssert);
+};
+
+function readFloat(buffer, offset, isBigEndian, noAssert) {
+ if (!noAssert) {
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset + 3 < buffer.length,
+ 'Trying to read beyond buffer length');
+ }
+
+ return require('./buffer_ieee754').readIEEE754(buffer, offset, isBigEndian,
+ 23, 4);
+}
+
+Buffer.prototype.readFloatLE = function(offset, noAssert) {
+ return readFloat(this, offset, false, noAssert);
+};
+
+Buffer.prototype.readFloatBE = function(offset, noAssert) {
+ return readFloat(this, offset, true, noAssert);
+};
+
+function readDouble(buffer, offset, isBigEndian, noAssert) {
+ if (!noAssert) {
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset + 7 < buffer.length,
+ 'Trying to read beyond buffer length');
+ }
+
+ return require('./buffer_ieee754').readIEEE754(buffer, offset, isBigEndian,
+ 52, 8);
+}
+
+Buffer.prototype.readDoubleLE = function(offset, noAssert) {
+ return readDouble(this, offset, false, noAssert);
+};
+
+Buffer.prototype.readDoubleBE = function(offset, noAssert) {
+ return readDouble(this, offset, true, noAssert);
+};
+
+
+/*
+ * We have to make sure that the value is a valid integer. This means that it is
+ * non-negative. It has no fractional component and that it does not exceed the
+ * maximum allowed value.
+ *
+ * value The number to check for validity
+ *
+ * max The maximum value
+ */
+function verifuint(value, max) {
+ assert.ok(typeof (value) == 'number',
+ 'cannot write a non-number as a number');
+
+ assert.ok(value >= 0,
+ 'specified a negative value for writing an unsigned value');
+
+ assert.ok(value <= max, 'value is larger than maximum value for type');
+
+ assert.ok(Math.floor(value) === value, 'value has a fractional component');
+}
+
+Buffer.prototype.writeUInt8 = function(value, offset, noAssert) {
+ var buffer = this;
+
+ if (!noAssert) {
+ assert.ok(value !== undefined && value !== null,
+ 'missing value');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset < buffer.length,
+ 'trying to write beyond buffer length');
+
+ verifuint(value, 0xff);
+ }
+
+ if (offset < buffer.length) {
+ buffer.parent[buffer.offset + offset] = value;
+ }
+};
+
+function writeUInt16(buffer, value, offset, isBigEndian, noAssert) {
+ if (!noAssert) {
+ assert.ok(value !== undefined && value !== null,
+ 'missing value');
+
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset + 1 < buffer.length,
+ 'trying to write beyond buffer length');
+
+ verifuint(value, 0xffff);
+ }
+
+ for (var i = 0; i < Math.min(buffer.length - offset, 2); i++) {
+ buffer.parent[buffer.offset + offset + i] =
+ (value & (0xff << (8 * (isBigEndian ? 1 - i : i)))) >>>
+ (isBigEndian ? 1 - i : i) * 8;
+ }
+
+}
+
+Buffer.prototype.writeUInt16LE = function(value, offset, noAssert) {
+ writeUInt16(this, value, offset, false, noAssert);
+};
+
+Buffer.prototype.writeUInt16BE = function(value, offset, noAssert) {
+ writeUInt16(this, value, offset, true, noAssert);
+};
+
+function writeUInt32(buffer, value, offset, isBigEndian, noAssert) {
+ if (!noAssert) {
+ assert.ok(value !== undefined && value !== null,
+ 'missing value');
+
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset + 3 < buffer.length,
+ 'trying to write beyond buffer length');
+
+ verifuint(value, 0xffffffff);
+ }
+
+ for (var i = 0; i < Math.min(buffer.length - offset, 4); i++) {
+ buffer.parent[buffer.offset + offset + i] =
+ (value >>> (isBigEndian ? 3 - i : i) * 8) & 0xff;
+ }
+}
+
+Buffer.prototype.writeUInt32LE = function(value, offset, noAssert) {
+ writeUInt32(this, value, offset, false, noAssert);
+};
+
+Buffer.prototype.writeUInt32BE = function(value, offset, noAssert) {
+ writeUInt32(this, value, offset, true, noAssert);
+};
+
+
+/*
+ * We now move onto our friends in the signed number category. Unlike unsigned
+ * numbers, we're going to have to worry a bit more about how we put values into
+ * arrays. Since we are only worrying about signed 32-bit values, we're in
+ * slightly better shape. Unfortunately, we really can't do our favorite binary
+ * & in this system. It really seems to do the wrong thing. For example:
+ *
+ * > -32 & 0xff
+ * 224
+ *
+ * What's happening above is really: 0xe0 & 0xff = 0xe0. However, the results of
+ * this aren't treated as a signed number. Ultimately a bad thing.
+ *
+ * What we're going to want to do is basically create the unsigned equivalent of
+ * our representation and pass that off to the wuint* functions. To do that
+ * we're going to do the following:
+ *
+ * - if the value is positive
+ * we can pass it directly off to the equivalent wuint
+ * - if the value is negative
+ * we do the following computation:
+ * mb + val + 1, where
+ * mb is the maximum unsigned value in that byte size
+ * val is the Javascript negative integer
+ *
+ *
+ * As a concrete value, take -128. In signed 16 bits this would be 0xff80. If
+ * you do out the computations:
+ *
+ * 0xffff - 128 + 1
+ * 0xffff - 127
+ * 0xff80
+ *
+ * You can then encode this value as the signed version. This is really rather
+ * hacky, but it should work and get the job done which is our goal here.
+ */
+
+/*
+ * A series of checks to make sure we actually have a signed 32-bit number
+ */
+function verifsint(value, max, min) {
+ assert.ok(typeof (value) == 'number',
+ 'cannot write a non-number as a number');
+
+ assert.ok(value <= max, 'value larger than maximum allowed value');
+
+ assert.ok(value >= min, 'value smaller than minimum allowed value');
+
+ assert.ok(Math.floor(value) === value, 'value has a fractional component');
+}
+
+function verifIEEE754(value, max, min) {
+ assert.ok(typeof (value) == 'number',
+ 'cannot write a non-number as a number');
+
+ assert.ok(value <= max, 'value larger than maximum allowed value');
+
+ assert.ok(value >= min, 'value smaller than minimum allowed value');
+}
+
+Buffer.prototype.writeInt8 = function(value, offset, noAssert) {
+ var buffer = this;
+
+ if (!noAssert) {
+ assert.ok(value !== undefined && value !== null,
+ 'missing value');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset < buffer.length,
+ 'Trying to write beyond buffer length');
+
+ verifsint(value, 0x7f, -0x80);
+ }
+
+ if (value >= 0) {
+ buffer.writeUInt8(value, offset, noAssert);
+ } else {
+ buffer.writeUInt8(0xff + value + 1, offset, noAssert);
+ }
+};
+
+function writeInt16(buffer, value, offset, isBigEndian, noAssert) {
+ if (!noAssert) {
+ assert.ok(value !== undefined && value !== null,
+ 'missing value');
+
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset + 1 < buffer.length,
+ 'Trying to write beyond buffer length');
+
+ verifsint(value, 0x7fff, -0x8000);
+ }
+
+ if (value >= 0) {
+ writeUInt16(buffer, value, offset, isBigEndian, noAssert);
+ } else {
+ writeUInt16(buffer, 0xffff + value + 1, offset, isBigEndian, noAssert);
+ }
+}
+
+Buffer.prototype.writeInt16LE = function(value, offset, noAssert) {
+ writeInt16(this, value, offset, false, noAssert);
+};
+
+Buffer.prototype.writeInt16BE = function(value, offset, noAssert) {
+ writeInt16(this, value, offset, true, noAssert);
+};
+
+function writeInt32(buffer, value, offset, isBigEndian, noAssert) {
+ if (!noAssert) {
+ assert.ok(value !== undefined && value !== null,
+ 'missing value');
+
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset + 3 < buffer.length,
+ 'Trying to write beyond buffer length');
+
+ verifsint(value, 0x7fffffff, -0x80000000);
+ }
+
+ if (value >= 0) {
+ writeUInt32(buffer, value, offset, isBigEndian, noAssert);
+ } else {
+ writeUInt32(buffer, 0xffffffff + value + 1, offset, isBigEndian, noAssert);
+ }
+}
+
+Buffer.prototype.writeInt32LE = function(value, offset, noAssert) {
+ writeInt32(this, value, offset, false, noAssert);
+};
+
+Buffer.prototype.writeInt32BE = function(value, offset, noAssert) {
+ writeInt32(this, value, offset, true, noAssert);
+};
+
+function writeFloat(buffer, value, offset, isBigEndian, noAssert) {
+ if (!noAssert) {
+ assert.ok(value !== undefined && value !== null,
+ 'missing value');
+
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset + 3 < buffer.length,
+ 'Trying to write beyond buffer length');
+
+ verifIEEE754(value, 3.4028234663852886e+38, -3.4028234663852886e+38);
+ }
+
+ require('./buffer_ieee754').writeIEEE754(buffer, value, offset, isBigEndian,
+ 23, 4);
+}
+
+Buffer.prototype.writeFloatLE = function(value, offset, noAssert) {
+ writeFloat(this, value, offset, false, noAssert);
+};
+
+Buffer.prototype.writeFloatBE = function(value, offset, noAssert) {
+ writeFloat(this, value, offset, true, noAssert);
+};
+
+function writeDouble(buffer, value, offset, isBigEndian, noAssert) {
+ if (!noAssert) {
+ assert.ok(value !== undefined && value !== null,
+ 'missing value');
+
+ assert.ok(typeof (isBigEndian) === 'boolean',
+ 'missing or invalid endian');
+
+ assert.ok(offset !== undefined && offset !== null,
+ 'missing offset');
+
+ assert.ok(offset + 7 < buffer.length,
+ 'Trying to write beyond buffer length');
+
+ verifIEEE754(value, 1.7976931348623157E+308, -1.7976931348623157E+308);
+ }
+
+ require('./buffer_ieee754').writeIEEE754(buffer, value, offset, isBigEndian,
+ 52, 8);
+}
+
+Buffer.prototype.writeDoubleLE = function(value, offset, noAssert) {
+ writeDouble(this, value, offset, false, noAssert);
+};
+
+Buffer.prototype.writeDoubleBE = function(value, offset, noAssert) {
+ writeDouble(this, value, offset, true, noAssert);
+};
+
+SlowBuffer.prototype.readUInt8 = Buffer.prototype.readUInt8;
+SlowBuffer.prototype.readUInt16LE = Buffer.prototype.readUInt16LE;
+SlowBuffer.prototype.readUInt16BE = Buffer.prototype.readUInt16BE;
+SlowBuffer.prototype.readUInt32LE = Buffer.prototype.readUInt32LE;
+SlowBuffer.prototype.readUInt32BE = Buffer.prototype.readUInt32BE;
+SlowBuffer.prototype.readInt8 = Buffer.prototype.readInt8;
+SlowBuffer.prototype.readInt16LE = Buffer.prototype.readInt16LE;
+SlowBuffer.prototype.readInt16BE = Buffer.prototype.readInt16BE;
+SlowBuffer.prototype.readInt32LE = Buffer.prototype.readInt32LE;
+SlowBuffer.prototype.readInt32BE = Buffer.prototype.readInt32BE;
+SlowBuffer.prototype.readFloatLE = Buffer.prototype.readFloatLE;
+SlowBuffer.prototype.readFloatBE = Buffer.prototype.readFloatBE;
+SlowBuffer.prototype.readDoubleLE = Buffer.prototype.readDoubleLE;
+SlowBuffer.prototype.readDoubleBE = Buffer.prototype.readDoubleBE;
+SlowBuffer.prototype.writeUInt8 = Buffer.prototype.writeUInt8;
+SlowBuffer.prototype.writeUInt16LE = Buffer.prototype.writeUInt16LE;
+SlowBuffer.prototype.writeUInt16BE = Buffer.prototype.writeUInt16BE;
+SlowBuffer.prototype.writeUInt32LE = Buffer.prototype.writeUInt32LE;
+SlowBuffer.prototype.writeUInt32BE = Buffer.prototype.writeUInt32BE;
+SlowBuffer.prototype.writeInt8 = Buffer.prototype.writeInt8;
+SlowBuffer.prototype.writeInt16LE = Buffer.prototype.writeInt16LE;
+SlowBuffer.prototype.writeInt16BE = Buffer.prototype.writeInt16BE;
+SlowBuffer.prototype.writeInt32LE = Buffer.prototype.writeInt32LE;
+SlowBuffer.prototype.writeInt32BE = Buffer.prototype.writeInt32BE;
+SlowBuffer.prototype.writeFloatLE = Buffer.prototype.writeFloatLE;
+SlowBuffer.prototype.writeFloatBE = Buffer.prototype.writeFloatBE;
+SlowBuffer.prototype.writeDoubleLE = Buffer.prototype.writeDoubleLE;
+SlowBuffer.prototype.writeDoubleBE = Buffer.prototype.writeDoubleBE;
projects / buffer.git / commitdiff