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123 lines
3.3 KiB
JavaScript

var inherits = require('util').inherits,
EventEmitter = require('events').EventEmitter;
var PARSE_HEADER_NAME = 0,
PARSE_HEADER_VAL = 1,
PARSE_BODY = 2;
var CR = 13,
LF = 10,
COLON = 58,
SPACE = 32,
TAB = 9,
REGEXP_FOLD = /\r\n\s+/g;
var MIMEParser = module.exports = function() {
this._state = PARSE_HEADER_NAME;
this._hdrname = '';
this._hdrval = '';
this._sawCR = false;
this._sawLF = false;
this._needUnfold = false;
};
inherits(MIMEParser, EventEmitter);
MIMEParser.prototype.execute = function(b, start, end) {
if (this._state == PARSE_BODY) {
var chunk;
if ((start === undefined && end === undefined)
|| (start === 0 && end === b.length))
chunk = b;
else
chunk = b.slice(start, end);
return this.emit('data', chunk);
}
start || (start = 0);
end || (end = b.length);
var i = start, finished = false;
while (i < end) {
if (this._state === PARSE_HEADER_NAME) {
if (i > start)
start = i;
while (i < end) {
if (b[i] === COLON) {
this._state = PARSE_HEADER_VAL;
finished = true;
break;
}
++i;
}
if (this._state === PARSE_HEADER_NAME)
this._hdrname += b.toString('ascii', start, end);
else if (finished) {
this._hdrname += b.toString('ascii', start, (i < end ? i : end));
finished = false;
++i;
}
} else if (this._state === PARSE_HEADER_VAL) {
if (i > start)
start = i;
while (i < end) {
if (b[i] === CR) {
if (!(this._sawCR && this._sawLF)) {
this._sawCR = true;
this._sawLF = false;
}
} else if (b[i] === LF && this._sawCR) {
if (this._sawLF) {
this._state = PARSE_BODY;
this._sawCR = false;
this._sawLF = false;
finished = true;
break;
}
this._sawLF = true;
} else {
if (this._sawCR && this._sawLF) {
if (b[i] !== SPACE && b[i] !== TAB) {
this._state = PARSE_HEADER_NAME;
this._sawCR = false;
this._sawLF = false;
finished = true;
break;
} else {
this._needUnfold = true;
// unfold
/*this._hdrval += b.toString('ascii', start, (i < end ? i - 2 : end));
start = i;*/
}
}
this._sawCR = false;
}
++i;
}
if (this._state === PARSE_HEADER_VAL)
this._hdrval += b.toString('ascii', start, (i < end ? i : end));
else if (finished) {
this._hdrval += b.toString('ascii', start, (i < end ? i - 2 : end));
if (this._needUnfold)
this._hdrval = this._hdrval.replace(REGEXP_FOLD, ' ');
this.emit('header', this._hdrname, this._hdrval.trim());
this._hdrname = '';
this._hdrval = '';
this._needUnfold = false;
finished = false;
if (this._state === PARSE_BODY) {
if ((i + 1) < end)
this.emit('data', b.slice(i + 1, end));
return;
}
}
}
}
};
MIMEParser.prototype.finish = function() {
this._state = PARSE_HEADER_NAME;
this._hdrname = '';
this._hdrval = '';
this._sawCR = false;
this._sawLF = false;
this._needUnfold = false;
};