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Annotation of OpenXM/src/cfep/MyDecoder.m, Revision 1.1

1.1     ! takayama    1: //
        !             2: //  MyDecoder.m
        !             3: //  cfep
        !             4: //
        !             5: //  Created by Nobuki Takayama on 06/01/29.
        !             6: //  Copyright 2006 OpenXM.org. All rights reserved.
        !             7: //
        !             8:
        !             9: #import "MyDecoder.h"
        !            10:
        !            11:
        !            12: @implementation MyDecoder
        !            13: -(void) dealloc {
        !            14:   if (data) {[data autorelease];  data=nil;}
        !            15:   [super dealloc];
        !            16: }
        !            17:
        !            18: -(NSString *)myDecoder: (int) c from: (id) myDocument {
        !            19:   Byte b[1];
        !            20:   NSString *s;
        !            21:   // NSLog(@"state=%d\n",state);
        !            22:   @synchronized(self) {
        !            23:     switch(state) {
        !            24:        case 0:
        !            25:          if (c == OX_PACKET_START)  {state = 1; channel=0;}
        !            26:          break;
        !            27:     case 1:
        !            28:          if (c == OX_DATA_CMO_DATA_START) {
        !            29:            size = 0; state = 2;
        !            30:          }else if ((c < '0') || (c > '9')) {
        !            31:            [self reportError: @"myDecoder: invalid channel.\n" to: myDocument];
        !            32:                [self reset]; return nil;
        !            33:          } else { channel = channel*10+c-'0'; }
        !            34:          break;
        !            35:        case 2:
        !            36:          if (c == OX_DATA_CMO_DATA_END_SIZE) {
        !            37:            state = 3;
        !            38:                if (size > MYDECODER_MAX) {
        !            39:                  [self reportError: @"myDecoder: too big size.\n" to: myDocument];
        !            40:                  [self reset];
        !            41:                  return nil;
        !            42:                }
        !            43:                data = [NSMutableData dataWithCapacity: (size+1)]; [data retain];
        !            44:          }else if ((c < '0') || (c > '9')) {
        !            45:            [self reportError: @"myDecoder: invalid size.\n" to: myDocument];
        !            46:                [self reset]; return nil;
        !            47:          } else { size = size*10+c-'0'; }
        !            48:          break;
        !            49:        case 3:
        !            50:          if (size <= 0) {
        !            51:            state = 4;
        !            52:                if (c != OX_DATA_CMO_DATA_END) {
        !            53:                  [self reportError: @"myDecoder: unexpected end of ox_data_cmo_data.\n" to: myDocument];
        !            54:                  [self reset];
        !            55:                  return nil;
        !            56:                }
        !            57:          }     else {
        !            58:         b[0] = c;
        !            59:            [data appendBytes: b length: 1];
        !            60:            size--;
        !            61:          }
        !            62:          break;
        !            63:        case 4:
        !            64:          if (c != OX_PACKET_END) {
        !            65:                  [self reportError: @"myDecoder: unexpected end of ox_packet.\n" to: myDocument];
        !            66:                  [self reset];
        !            67:                  return nil;
        !            68:          }else{
        !            69:            b[0] = 0; [data appendBytes: b length: 1];
        !            70:            s = [NSString stringWithCString: [data bytes] encoding: NSUTF8StringEncoding];
        !            71:                [self reset];
        !            72:                return s;
        !            73:          }
        !            74:          break;
        !            75:        default:
        !            76:          [self reportError: @"myDecoder: unknown state.\n" to: myDocument]; [self reset];
        !            77:          break;
        !            78:        }
        !            79:   }
        !            80:   return nil;
        !            81: }
        !            82:
        !            83: -(int) getChannel {
        !            84:   return channel;
        !            85: }
        !            86:
        !            87: -(void) reset {
        !            88:   @synchronized(self) {
        !            89:        state = 0;
        !            90:        // NSLog(@"data retainCount=%d\n",[data retainCount]);   // --> 2.
        !            91:        if (data) { [data autorelease]; data=nil;}
        !            92:   }
        !            93: }
        !            94:
        !            95: -(void) reportError: (NSString *) msg to: (id) myDocument {
        !            96:    [myDocument outputErrorString: msg];
        !            97:    NSLog(@"data=%@",data);
        !            98: }
        !            99:
        !           100:
        !           101: @end