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buffer reader.

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This commit is contained in:
Christopher Jeffrey 2016-03-25 15:48:44 -07:00
parent 62a7dba556
commit adb95e2a3a
1 changed files with 29 additions and 15 deletions
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44
lib/bcoin/reader.js
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@ -14,6 +14,10 @@ var assert = utils.assert;
function BufferReader(data, zeroCopy) { function BufferReader(data, zeroCopy) {
if (data instanceof BufferReader) if (data instanceof BufferReader)
return data; return data;
if (!(this instanceof BufferReader))
return new BufferReader(data, zeroCopy);
this.data = data; this.data = data;
this.offset = 0; this.offset = 0;
this.zeroCopy = zeroCopy; this.zeroCopy = zeroCopy;
@ -30,11 +34,8 @@ BufferReader.prototype.end = function end() {
var start = this.stack.pop(); var start = this.stack.pop();
var end = this.offset; var end = this.offset;
if (this.stack.length === 0) { if (this.stack.length === 0)
delete this.offset; this.destroy();
delete this.stack;
delete this.data;
}
return end - start; return end - start;
}; };
@ -47,11 +48,8 @@ BufferReader.prototype.endData = function endData() {
var size = end - start; var size = end - start;
var data = this.data; var data = this.data;
if (this.stack.length === 0) { if (this.stack.length === 0)
delete this.offset; this.destroy();
delete this.stack;
delete this.data;
}
if (size === data.length) if (size === data.length)
return data; return data;
@ -59,6 +57,12 @@ BufferReader.prototype.endData = function endData() {
return utils.slice(data, start, end); return utils.slice(data, start, end);
}; };
BufferReader.prototype.destroy = function destroy() {
delete this.offset;
delete this.stack;
delete this.data;
};
BufferReader.prototype.readU8 = function readU8() { BufferReader.prototype.readU8 = function readU8() {
assert(this.offset + 1 <= this.data.length); assert(this.offset + 1 <= this.data.length);
var ret = utils.readU8(this.data, this.offset); var ret = utils.readU8(this.data, this.offset);
@ -235,11 +239,6 @@ BufferReader.prototype.readNullString = function readNullString(enc) {
return ret; return ret;
}; };
BufferReader.prototype.left = function left() {
assert(this.offset <= this.data.length);
return this.data.length - this.offset;
};
BufferReader.prototype.readVarint = function readVarint() { BufferReader.prototype.readVarint = function readVarint() {
assert(this.offset + 1 <= this.data.length); assert(this.offset + 1 <= this.data.length);
var result = utils.readVarint(this.data, this.offset); var result = utils.readVarint(this.data, this.offset);
@ -249,6 +248,21 @@ BufferReader.prototype.readVarint = function readVarint() {
return result.r; return result.r;
}; };
BufferReader.prototype.left = function left() {
assert(this.offset <= this.data.length);
return this.data.length - this.offset;
};
BufferReader.prototype.getSize = function getSize() {
return this.data.length;
};
BufferReader.prototype.seek = function seek(off) {
assert(this.offset + off <= this.data.length);
this.offset += off;
return off;
};
/** /**
* Expose * Expose
*/ */