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358 lines (267 loc) · 8.06 KB
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var SlowBuffer = process.binding('buffer').SlowBuffer;
function toHex (n) {
if (n < 16) return "0" + n.toString(16);
return n.toString(16);
}
SlowBuffer.prototype.inspect = function () {
var out = [],
len = this.length;
for (var i = 0; i < len; i++) {
out[i] = toHex(this[i]);
}
return "<SlowBuffer " + out.join(" ") + ">";
};
SlowBuffer.prototype.toString = function (encoding, start, end) {
encoding = String(encoding || 'utf8').toLowerCase();
start = +start || 0;
if (typeof end == "undefined") end = this.length;
// Fastpath empty strings
if (+end == start) {
return '';
}
switch (encoding) {
case 'utf8':
case 'utf-8':
return this.utf8Slice(start, end);
case 'ascii':
return this.asciiSlice(start, end);
case 'binary':
return this.binarySlice(start, end);
case 'base64':
return this.base64Slice(start, end);
default:
throw new Error('Unknown encoding');
}
};
SlowBuffer.prototype.write = function (string, offset, encoding) {
// Support both (string, offset, encoding)
// and the legacy (string, encoding, offset)
if (!isFinite(offset)) {
var swap = encoding;
encoding = offset;
offset = swap;
}
offset = +offset || 0;
encoding = String(encoding || 'utf8').toLowerCase();
switch (encoding) {
case 'utf8':
case 'utf-8':
return this.utf8Write(string, offset);
case 'ascii':
return this.asciiWrite(string, offset);
case 'binary':
return this.binaryWrite(string, offset);
case 'base64':
return this.base64Write(string, offset);
default:
throw new Error('Unknown encoding');
}
};
// slice(start, end)
SlowBuffer.prototype.slice = function (start, end) {
if (end > this.length) {
throw new Error("oob");
}
if (start > end) {
throw new Error("oob");
}
return new Buffer(this, end - start, +start);
};
// 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 = encoding;
this.parent = subject;
this.offset = offset;
} else {
// Find the length
switch (type = typeof subject) {
case 'number':
this.length = subject;
break;
case 'string':
this.length = Buffer.byteLength(subject, encoding);
break;
case 'object': // Assume object is an array
this.length = subject.length;
break;
default:
throw new Error("First argument need to be an 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;
}
// Assume object is an array
if (Array.isArray(subject)) {
for (var i = 0; i < this.length; i++) {
this.parent[i + this.offset] = subject[i];
}
} else if (type == 'string') {
// We are a string
this.length = this.write(subject, 0, encoding);
}
}
SlowBuffer.makeFastBuffer(this.parent, this, this.offset, this.length);
}
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;
};
// 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]);
}
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, encoding = 'utf8')
Buffer.prototype.write = function write (string, offset, encoding) {
if (!isFinite(offset)) {
var swap = encoding;
encoding = offset;
offset = swap;
}
offset = +offset || 0;
encoding = String(encoding || 'utf8').toLowerCase();
// Make sure we are not going to overflow
var maxLength = this.length - offset;
var ret;
switch (encoding) {
case 'utf8':
case 'utf-8':
ret = this.parent.utf8Write(string, this.offset + offset, maxLength);
break;
case 'ascii':
ret = this.parent.asciiWrite(string, this.offset + offset, maxLength);
break;
case 'binary':
ret = this.parent.binaryWrite(string, this.offset + offset, maxLength);
break;
case 'base64':
// Warning: maxLength not taken into account in base64Write
ret = this.parent.base64Write(string, this.offset + offset, maxLength);
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 '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);
default:
throw new Error('Unknown encoding');
}
};
// byteLength
Buffer.byteLength = SlowBuffer.byteLength;
// copy(targetBuffer, targetStart, sourceStart, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, target_start, start, end) {
var source = this;
start || (start = 0);
end || (end = this.length);
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) 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");
};
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