Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / MultipartContentParser.cs / 1 / MultipartContentParser.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * Multipart content parser. * * Copyright (c) 1998 Microsoft Corporation */ namespace System.Web { using System.Text; using System.Collections; using System.Globalization; using System.Web.Util; /* * Element of the multipart content */ internal sealed class MultipartContentElement { private String _name; private String _filename; private String _contentType; private HttpRawUploadedContent _data; private int _offset; private int _length; internal MultipartContentElement(String name, String filename, String contentType, HttpRawUploadedContent data, int offset, int length) { _name = name; _filename = filename; _contentType = contentType; _data = data; _offset = offset; _length = length; } internal bool IsFile { get { return(_filename != null);} } internal bool IsFormItem { get { return(_filename == null);} } internal String Name { get { return _name;} } internal HttpPostedFile GetAsPostedFile() { return new HttpPostedFile( _filename, _contentType, new HttpInputStream(_data, _offset, _length)); } internal String GetAsString(Encoding encoding) { if (_length > 0) { return encoding.GetString(_data.GetAsByteArray(_offset, _length)); } else { return String.Empty; } } } /* * Multipart content parser. Split content into elements. */ internal sealed class HttpMultipartContentTemplateParser { private HttpRawUploadedContent _data; private int _length; private int _pos; private ArrayList _elements = new ArrayList(); // currently parsed line private int _lineStart = -1; private int _lineLength = -1; // last boundary has extra -- private bool _lastBoundaryFound; // part separator private byte[] _boundary; // current header values private String _partName; private String _partFilename; private String _partContentType; // current part's content data private int _partDataStart = -1; private int _partDataLength = -1; // encoding private Encoding _encoding; private HttpMultipartContentTemplateParser(HttpRawUploadedContent data, int length, byte[] boundary, Encoding encoding) { _data = data; _length = length; _boundary = boundary; _encoding = encoding; } private bool AtEndOfData() { return(_pos >= _length || _lastBoundaryFound); } private bool GetNextLine() { int i = _pos; _lineStart = -1; while (i < _length) { if (_data[i] == 10) { // '\n' _lineStart = _pos; _lineLength = i - _pos; _pos = i+1; // ignore \r if (_lineLength > 0 && _data[i-1] == 13) _lineLength--; // line found break; } if (++i == _length) { // last line doesn't end with \n _lineStart = _pos; _lineLength = i - _pos; _pos = _length; } } return(_lineStart >= 0); } private String ExtractValueFromContentDispositionHeader(String l, int pos, String name) { String pattern = name + "=\""; int i1 = CultureInfo.InvariantCulture.CompareInfo.IndexOf(l, pattern, pos, CompareOptions.IgnoreCase); if (i1 < 0) return null; i1 += pattern.Length; int i2 = l.IndexOf('"', i1); if (i2 < 0) return null; if (i2 == i1) return String.Empty; return l.Substring(i1, i2-i1); } private void ParsePartHeaders() { _partName = null; _partFilename = null; _partContentType = null; while (GetNextLine()) { if (_lineLength == 0) break; // empty line signals end of headers // get line as String byte[] lineBytes = new byte[_lineLength]; _data.CopyBytes(_lineStart, lineBytes, 0, _lineLength); String line = _encoding.GetString(lineBytes); // parse into header and value int ic = line.IndexOf(':'); if (ic < 0) continue; // not a header // remeber header String header = line.Substring(0, ic); if (StringUtil.EqualsIgnoreCase(header, "Content-Disposition")) { // parse name and filename _partName = ExtractValueFromContentDispositionHeader(line, ic+1, "name"); _partFilename = ExtractValueFromContentDispositionHeader(line, ic+1, "filename"); } else if (StringUtil.EqualsIgnoreCase(header, "Content-Type")) { _partContentType = line.Substring(ic+1).Trim(); } } } private bool AtBoundaryLine() { // check for either regular or last boundary line length int len = _boundary.Length; if (_lineLength != len && _lineLength != len+2) return false; // match with boundary for (int i = 0; i < len; i++) { if (_data[_lineStart+i] != _boundary[i]) return false; } // regular boundary line? if (_lineLength == len) return true; // last boundary line? (has to end with "--") if (_data[_lineStart+len] != 45 || _data[_lineStart+len+1] != 45) return false; _lastBoundaryFound = true; // remember that it is last return true; } private void ParsePartData() { _partDataStart = _pos; _partDataLength = -1; while (GetNextLine()) { if (AtBoundaryLine()) { // calc length: adjust to exclude [\r]\n before the separator int iEnd = _lineStart - 1; if (_data[iEnd] == 10) // \n iEnd--; if (_data[iEnd] == 13) // \r iEnd--; _partDataLength = iEnd - _partDataStart + 1; break; } } } private void ParseIntoElementList() { // // Skip until first boundary // while (GetNextLine()) { if (AtBoundaryLine()) break; } if (AtEndOfData()) return; // // Parse the parts // do { // Parse current part's headers ParsePartHeaders(); if (AtEndOfData()) break; // cannot stop after headers // Parse current part's data ParsePartData(); if (_partDataLength == -1) break; // ending boundary not found // Remember the current part (if named) if (_partName != null) { _elements.Add(new MultipartContentElement( _partName, _partFilename, _partContentType, _data, _partDataStart, _partDataLength)); } } while (!AtEndOfData()); } /* * Static method to do the parsing */ internal static MultipartContentElement[] Parse(HttpRawUploadedContent data, int length, byte[] boundary, Encoding encoding) { HttpMultipartContentTemplateParser parser = new HttpMultipartContentTemplateParser(data, length, boundary, encoding); parser.ParseIntoElementList(); return (MultipartContentElement[])parser._elements.ToArray(typeof(MultipartContentElement)); } } }
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