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var Buffer = require('buffer').Buffer;
function OffsetBuffer() {
this.offset = 0;
this.size = 0;
this.buffers = [];
}
module.exports = OffsetBuffer;
OffsetBuffer.prototype.isEmpty = function isEmpty() {
return this.size === 0;
};
OffsetBuffer.prototype.clone = function clone(size) {
var r = new OffsetBuffer();
r.offset = this.offset;
r.size = size;
r.buffers = this.buffers.slice();
return r;
};
OffsetBuffer.prototype.toChunks = function toChunks() {
if (this.size === 0)
return [];
// We are going to slice it anyway
if (this.offset !== 0) {
this.buffers[0] = this.buffers[0].slice(this.offset);
this.offset = 0;
}
var chunks = [ ];
var off = 0;
for (var i = 0; off <= this.size && i < this.buffers.length; i++) {
var buf = this.buffers[i];
off += buf.length;
// Slice off last buffer
if (off > this.size) {
buf = buf.slice(0, buf.length - (off - this.size));
this.buffers[i] = buf;
}
chunks.push(buf);
}
// If some buffers were skipped - trim length
if (i < this.buffers.length)
this.buffers.length = i;
return chunks;
};
OffsetBuffer.prototype.toString = function toString(enc) {
return this.toChunks().map(function(c) {
return c.toString(enc);
}).join('');
};
OffsetBuffer.prototype.use = function use(buf, off, n) {
this.buffers = [ buf ];
this.offset = off;
this.size = n;
};
OffsetBuffer.prototype.push = function push(data) {
// Ignore empty writes
if (data.length === 0)
return;
this.size += data.length;
this.buffers.push(data);
};
OffsetBuffer.prototype.has = function has(n) {
return this.size >= n;
};
OffsetBuffer.prototype.skip = function skip(n) {
if (this.size === 0)
return;
this.size -= n;
// Fast case, skip bytes in a first buffer
if (this.offset + n < this.buffers[0].length) {
this.offset += n;
return;
}
var left = n - (this.buffers[0].length - this.offset);
this.offset = 0;
for (var shift = 1; left > 0 && shift < this.buffers.length; shift++) {
var buf = this.buffers[shift];
if (buf.length > left) {
this.offset = left;
break;
}
left -= buf.length;
}
this.buffers = this.buffers.slice(shift);
};
OffsetBuffer.prototype.copy = function copy(target, targetOff, off, n) {
if (this.size === 0)
return;
if (off !== 0)
throw new Error('Unsupported offset in .copy()');
var toff = targetOff;
var first = this.buffers[0];
var toCopy = Math.min(n, first.length - this.offset);
first.copy(target, toff, this.offset, this.offset + toCopy);
toff += toCopy;
var left = n - toCopy;
for (var i = 1; left > 0 && i < this.buffers.length; i++) {
var buf = this.buffers[i];
var toCopy = Math.min(left, buf.length);
buf.copy(target, toff, 0, toCopy);
toff += toCopy;
left -= toCopy;
}
};
OffsetBuffer.prototype.take = function take(n) {
if (n === 0)
return new Buffer(0);
this.size -= n;
// Fast cases
var first = this.buffers[0].length - this.offset;
if (first === n) {
var r = this.buffers.shift();
if (this.offset !== 0) {
r = r.slice(this.offset);
this.offset = 0;
}
return r;
} else if (first > n) {
var r = this.buffers[0].slice(this.offset, this.offset + n);
this.offset += n;
return r;
}
// Allocate and fill buffer
var out = new Buffer(n);
var toOff = 0;
var startOff = this.offset;
for (var i = 0; toOff !== n && i < this.buffers.length; i++) {
var buf = this.buffers[i];
var toCopy = Math.min(buf.length - startOff, n - toOff);
buf.copy(out, toOff, startOff, startOff + toCopy);
if (startOff + toCopy < buf.length) {
this.offset = startOff + toCopy;
break;
} else {
toOff += toCopy;
startOff = 0;
}
}
this.buffers = this.buffers.slice(i);
if (this.buffers.length === 0)
this.offset = 0;
return out;
};
OffsetBuffer.prototype.peekUInt8 = function peekUInt8() {
return this.buffers[0][this.offset];
};
OffsetBuffer.prototype.readUInt8 = function readUInt8() {
this.size -= 1;
var first = this.buffers[0];
var r = first[this.offset];
if (++this.offset === first.length) {
this.offset = 0;
this.buffers.shift();
}
return r;
};
OffsetBuffer.prototype.readUInt16LE = function readUInt16LE() {
var first = this.buffers[0];
this.size -= 2;
var r;
var shift;
// Fast case - first buffer has all bytes
if (first.length - this.offset >= 2) {
r = first.readUInt16LE(this.offset);
shift = 0;
this.offset += 2;
// One byte here - one byte there
} else {
r = first[this.offset] | (this.buffers[1][0] << 8);
shift = 1;
this.offset = 1;
}
if (this.offset === this.buffers[shift].length) {
this.offset = 0;
shift++;
}
if (shift !== 0)
this.buffers = this.buffers.slice(shift);
return r;
};
OffsetBuffer.prototype.readUInt24LE = function readUInt24LE() {
var first = this.buffers[0];
var r;
var shift;
var firstHas = first.length - this.offset;
// Fast case - first buffer has all bytes
if (firstHas >= 3) {
r = first.readUInt16LE(this.offset) | (first[this.offset + 2] << 16);
shift = 0;
this.offset += 3;
// First buffer has 2 of 3 bytes
} else if (firstHas >= 2) {
r = first.readUInt16LE(this.offset) | (this.buffers[1][0] << 16);
shift = 1;
this.offset = 1;
// Slow case: First buffer has 1 of 3 bytes
} else {
r = first[this.offset];
this.offset = 0;
this.buffers.shift();
this.size -= 1;
r |= this.readUInt16LE() << 8;
return r;
}
this.size -= 3;
if (this.offset === this.buffers[shift].length) {
this.offset = 0;
shift++;
}
if (shift !== 0)
this.buffers = this.buffers.slice(shift);
return r;
};
OffsetBuffer.prototype.readUInt32LE = function readUInt32LE() {
var first = this.buffers[0];
var r;
var shift;
var firstHas = first.length - this.offset;
// Fast case - first buffer has all bytes
if (firstHas >= 4) {
r = first.readUInt32LE(this.offset);
shift = 0;
this.offset += 4;
// First buffer has 3 of 4 bytes
} else if (firstHas >= 3) {
r = (first.readUInt16LE(this.offset) |
(first[this.offset + 2] << 16)) +
(this.buffers[1][0] * 0x1000000);
shift = 1;
this.offset = 1;
// Slow case: First buffer has 2 of 4 bytes
} else if (firstHas >= 2) {
r = first.readUInt16LE(this.offset);
this.offset = 0;
this.buffers.shift();
this.size -= 2;
r += this.readUInt16LE() * 0x10000;
return r;
// Slow case: First buffer has 1 of 4 bytes
} else {
r = first[this.offset];
this.offset = 0;
this.buffers.shift();
this.size -= 1;
r += this.readUInt24LE() * 0x100;
return r;
}
this.size -= 4;
if (this.offset === this.buffers[shift].length) {
this.offset = 0;
shift++;
}
if (shift !== 0)
this.buffers = this.buffers.slice(shift);
return r;
};
OffsetBuffer.prototype.readUInt16BE = function readUInt16BE() {
var r = this.readUInt16LE();
return ((r & 0xff) << 8) | (r >> 8);
};
OffsetBuffer.prototype.readUInt24BE = function readUInt24BE() {
var r = this.readUInt24LE();
return ((r & 0xff) << 16) | (((r >> 8) & 0xff) << 8) | (r >> 16);
};
OffsetBuffer.prototype.readUInt32BE = function readUInt32BE() {
var r = this.readUInt32LE();
return (((r & 0xff) << 24) |
(((r >>> 8) & 0xff) << 16) |
(((r >>> 16) & 0xff) << 8) |
(r >>> 24)) >>> 0;
};
// Signed number APIs
function signedInt8(num) {
if (num >= 0x80)
return -(0xff ^ num) - 1;
else
return num;
}
OffsetBuffer.prototype.peekInt8 = function peekInt8() {
return signedInt8(this.peekUInt8());
};
OffsetBuffer.prototype.readInt8 = function readInt8() {
return signedInt8(this.readUInt8());
};
function signedInt16(num) {
if (num >= 0x8000)
return -(0xffff ^ num) - 1;
else
return num;
}
OffsetBuffer.prototype.readInt16BE = function readInt16BE() {
return signedInt16(this.readUInt16BE());
};
OffsetBuffer.prototype.readInt16LE = function readInt16LE() {
return signedInt16(this.readUInt16LE());
};
function signedInt24(num) {
if (num >= 0x800000)
return -(0xffffff ^ num) - 1;
else
return num;
}
OffsetBuffer.prototype.readInt24BE = function readInt24BE() {
return signedInt24(this.readUInt24BE());
};
OffsetBuffer.prototype.readInt24LE = function readInt24LE() {
return signedInt24(this.readUInt24LE());
};
function signedInt32(num) {
if (num >= 0x80000000)
return -(0xffffffff ^ num) - 1;
else
return num;
}
OffsetBuffer.prototype.readInt32BE = function readInt32BE() {
return signedInt32(this.readUInt32BE());
};
OffsetBuffer.prototype.readInt32LE = function readInt32LE() {
return signedInt32(this.readUInt32LE());
};