How can I know the length of the image data section of a PSD file

I'm a C++ programmer developing a project to parse PSD files, and it's necessary to know whether there is a length field indicating the length of the image data in image data section of a PSD file, if not, how can I know the length?
Thank you.

Sorry I can't help, maybe there is some information in the SDK?
http://www.adobe.com/devnet/photoshop/sdk.html
Or someone might be able to help in this forum?
http://forums.adobe.com/community/photoshop/photoshop_sdk

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TYPES: begin of errmess,
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TABLES : t100.
DATA: BEGIN OF DD_VA01,
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DATA:IT_VA01     Like TABLE OF DD_VA01,
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     WA_VA01_F   Like LINE OF IT_VA01,
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data: zf1 type i,
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PERFORM get_input using 'C:\Documents and Settings\ic881592\Desktop\Daran_bdc_VA01-e.txt'.
SORT IT_VA01 BY AUART KUNNR BSTKD.
LOOP AT IT_VA01 INTO WA_VA01.
if WA_VA01_F-AUART <> WA_VA01-AUART OR
     WA_VA01_F-KUNNR <> WA_VA01-KUNNR OR
     WA_VA01_F-BSTKD <> WA_VA01-BSTKD.
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endif.
PERFORM create_bdc_item_data.
ENDLOOP.
PERFORM call_transaction.
PERFORM errorlog.
Procedures ***********************************************************
form get_input using w_fname.
CALL FUNCTION 'GUI_UPLOAD'
    EXPORTING
      FILENAME            = W_FNAME
      HAS_FIELD_SEPARATOR = '#'
    TABLES
      DATA_TAB            = IT_VA01.
endform.
form call_transaction.
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    CALL TRANSACTION 'VA01' USING IT_BDCDATA MODE 'A' messages into messtab.
    refresh it_bdcdata.
endform.
FORM set_header_flag.
       WA_VA01_F-AUART = WA_VA01-AUART.
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form create_bdc_header_data.
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     perform bdc_field       using 'KUAGV-KUNNR' WA_VA01-KUNNR.
     perform bdc_field       using 'VBKD-BSTKD' WA_VA01-BSTKD.
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     perform bdc_dynpro      using 'SAPMSSY0' '0120'.
     perform bdc_field       using 'BDC_CURSOR' '04/06'.
     perform bdc_field       using 'BDC_OKCODE' '=CHOO'.
     perform bdc_dynpro      using 'SAPMV45A' '4001'.
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     CONCATENATE 'RV45A-KWMENG(' zc1 ')' INTO FN.
     perform bdc_field       using 'BDC_CURSOR' FN.
     perform bdc_field       using FN WA_VA01-KWMENG.
     CONCATENATE 'KOMV-KBETR(' zc1 ')' INTO FN.
     perform bdc_field       using FN WA_VA01-KBETR.
     CONCATENATE 'RV45A-MABNR(' zc1 ')' INTO FN.
     perform bdc_field       using FN WA_VA01-MABNR.
     perform bdc_dynpro      using 'SAPMV45A' '4001'.
     PERFORM bdc_field       USING 'BDC_OKCODE' '=POAN'.
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LOOP AT MESSTAB .
    if MESSTAB-MSGNR = '311' or MESSTAB-MSGTYP = 'E'.
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                        into wa_errmess
                        WHERE SPRSL = MESSTAB-MSGSPRA
                          AND ARBGB = MESSTAB-MSGID
                          AND MSGNR = MESSTAB-MSGNR.
        IF SY-SUBRC = 0.
          err_message = wa_errmess-TEXT.
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            REPLACE '&2' WITH MESSTAB-MSGV2 INTO err_message.
            REPLACE '&3' WITH MESSTAB-MSGV3 INTO err_message.
            REPLACE '&4' WITH MESSTAB-MSGV4 INTO err_message.
          ELSE.
            REPLACE '&' WITH MESSTAB-MSGV1 INTO err_message.
            REPLACE '&' WITH MESSTAB-MSGV2 INTO err_message.
            REPLACE '&' WITH MESSTAB-MSGV3 INTO err_message.
            REPLACE '&' WITH MESSTAB-MSGV4 INTO err_message.
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          WRITE: / MESSTAB-MSGTYP, err_message .
        ELSE.
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    endif.
ENDLOOP.
endform. "errorlog
FORM BDC_DYNPRO USING PROGRAM DYNPRO.
WA_BDCDATA-PROGRAM = PROGRAM.
WA_BDCDATA-DYNPRO   = DYNPRO.
WA_BDCDATA-DYNBEGIN = 'X'.
APPEND WA_BDCDATA TO IT_BDCDATA.
CLEAR WA_BDCDATA.
ENDFORM.
FORM BDC_FIELD USING FNAM FVAL.
WA_BDCDATA-FNAM = FNAM.
WA_BDCDATA-FVAL = FVAL.
APPEND WA_BDCDATA TO IT_BDCDATA.
CLEAR WA_BDCDATA.
ENDFORM.
input file :
OR     2148     0001235     R-1162     8     17
OR     2148     0001235     R-1161     2     30
OR     2148     0001235     100-400     6     25
OR     2148     0001235     R-1162     4     12
OR     2148     0001236     R-1162     3     12
OR     2148     0001236     R-1161     2     30
OR     2148     0001236     100-400     1     25
OR     2148     0001236     R-1162     7     12
OR     2148     0001236     R-1161     8     30
OR     2148     0001236     100-400     10     25
OR     2148     0001235     R-1161     5     30
OR     2148     0001235     100-400     2     25
OR     2148     0001235     R-11621     3     12
OR     2148     0001235     R-1161     2     30
OR     2148     0001235     100-400     1     25
OR     2148     0001235     R-1162     7     12
OR     2148     0001235     R-1161     8     30
OR     2148     0001235     100-400     10     25
OR     2148     0001236     R-1162     8     17
OR     2148     0001236     R-1161     2     30
OR     2148     0001236     100-400     6     25
OR     2148     0001236     R-1162     4     12
OR     2148     0001236     R-1161     5     30
OR     2148     0001236     100-400     2     25

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