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| Current File : //proc/self/root/home/saurabh/.npm/_npx/249ca9fcd30c476a/node_modules/pngjs/lib/sync-reader.js |
'use strict';
var SyncReader = module.exports = function(buffer) {
this._buffer = buffer;
this._reads = [];
};
SyncReader.prototype.read = function(length, callback) {
this._reads.push({
length: Math.abs(length), // if length < 0 then at most this length
allowLess: length < 0,
func: callback
});
};
SyncReader.prototype.process = function() {
// as long as there is any data and read requests
while (this._reads.length > 0 && this._buffer.length) {
var read = this._reads[0];
if (this._buffer.length && (this._buffer.length >= read.length || read.allowLess)) {
// ok there is any data so that we can satisfy this request
this._reads.shift(); // == read
var buf = this._buffer;
this._buffer = buf.slice(read.length);
read.func.call(this, buf.slice(0, read.length));
}
else {
break;
}
}
if (this._reads.length > 0) {
return new Error('There are some read requests waitng on finished stream');
}
if (this._buffer.length > 0) {
return new Error('unrecognised content at end of stream');
}
};
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