How to find length(in Bytes) of an Inputstream

Hi ,
I have a dynamic InputStream which is coming from a HTTPRequest .
My requirement is to read the data in stream more than once . If i read the data using read(), it will read the entire data and for the subsequent reading it is not allowing .
So, is there any way to read a stream more than once .
Is it possible to get the length(in Bytes) of an InputStream

rajeshreddyk wrote:
My requirement is to read the data in stream more than once . If i read the data using read(), it will read the entire data and for the subsequent reading it is not allowing .
So, is there any way to read a stream more than once .Store the data somewhere on your end, then re-read as often as you fancy.
PushbackInputStream may offer the desired functionality, IF you know the message size in advance (which you should, if it's HTTP). I'm not quite certain it should be used for very large streams, though.
Alternatively (and probably better), write all your data once to a BAOS, and re-read from it (using a BAIS).
Is it possible to get the length(in Bytes) of an InputStreamNo, not as such.
However, a specific protocol may stipulate that the message size should be written to the stream (as data), and thus the recieving end would know how much data there is to read.
In HTTP, this is handled with the Content-Length header parameter.

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DESCRIBE TABLE
Syntax
DESCRIBE TABLE itab [KIND knd] [LINES lin] [OCCURS n].
Extras:
1. ... KIND knd
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Notes
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Addition 1
... KIND knd
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... OCCURS n
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Example
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TYPE-POOLS sydes.
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Note
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Syntax
DESCRIBE FIELD dobj INTO td.
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In TYPES, the tree structure of the type belonging to f is displayed. The components of a node are stored in the table TYPES in a continuous manner. Beginning and end of the line area that represents the components are stored in TYPES-FROM and TYPES-TO. The reference to the superior node can be found in TYPES-BACK. If no superior resp. subordinate node exists, then this is marked by the value 0 (For the relevance of further components, refer to the following sections).
The names of components, types etc. are not stored directly in TYPES. Instead, the components TYPES-IDX_... hold an index in the name table NAMES. The value 0 indicates that there is no reference to the name table.
NAMES contains the possibly fragmented names in the component NAMES-NAME. If a name continues in the following line, this is indicated by an asterisk ('*') in the component NAMES-CONTINUE.
The type description table (TYPES) not only stores information about the tree structure but also further information about the type of f resp. its components. This includes especially all information that can be determined using the usual additions to DESCRIBE FIELD. In detail, TYPES contains the following columns:
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SYDES_CONTEXT-METHOD : METHOD-local type
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IDX_HELP_ID
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OUTPUT_LENGTH
Output length, corresponds to the addition OUTPUT-LENGTH at simple DESCRIBE
DECIMALS
Number of decimal digits, corresponds to the addition DECIMALS at simple DESCRIBE
TYPE
ABAP-Type, corresponds to the addition TYPE at simple DESCRIBE
TABLE_KIND
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Example
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PROGRAM DESCTEST.
TYPES: BEGIN OF name_struc,
         first TYPE c LENGTH 20,
         last   TYPE c LENGTH 20,
       END OF name_struc,
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         from       TYPE t,
         to         TYPE t,
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       phone_number TYPE n LENGTH 20,
       BEGIN OF employee_struc,
         id         LIKE sbook-customid,
         name       TYPE name_struc,
         BEGIN OF address,
           street TYPE c LENGTH 30,
           zipcode TYPE n LENGTH 4,
           place   TYPE c LENGTH 30,
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         salary_per_month TYPE p LENGTH 10 DECIMALS 3,
         absent           TYPE STANDARD TABLE OF absence_time_struc
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         phone            TYPE STANDARD TABLE OF phone_number
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You can determine the structure of the type EMPLOYEE_STRUC by collecting the type group SYDES as follows:
TYPE-POOLS: sydes.
DATA: employee TYPE employee_struc,
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DESCRIBE FIELD employee INTO td.
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    |FROM| TO |BACK|NAME|UTYP|EMSK|TYPE
|--||||||--
1 | 2 | 7 | 0 | 0 | 2 | 0 | v
2 | 0 | 0 | 1 | 6 | 0 | 4 | N
3 | 8 | 9 | 1 | 7 | 5 | 0 | u
4 | 10 | 12 | 1 | 8 | 0 | 0 | u
5 | 0 | 0 | 1 | 9 | 0 | 0 | P
6 | 13 | 13 | 1 | 11 | 0 | 0 | h
7 | 17 | 17 | 1 | 12 | 0 | 0 | h
8 | 0 | 0 | 3 | 13 | 0 | 0 | C
9 | 0 | 0 | 3 | 14 | 0 | 0 | C
10 | 0 | 0 | 4 | 15 | 0 | 0 | C
11 | 0 | 0 | 4 | 16 | 0 | 0 | N
12 | 0 | 0 | 4 | 17 | 0 | 0 | C
13 | 14 | 16 | 6 | 0 | 18 | 0 | u
14 | 0 | 0 | 13 | 20 | 0 | 0 | D
15 | 0 | 0 | 13 | 21 | 0 | 0 | T
16 | 0 | 0 | 13 | 22 | 0 | 0 | T
17 | 0 | 0 | 7 | 0 | 0 | 0 | N
Please note that the entries in rows 6 and 7 represent internal tables (ABAP-Type h). There is always an entry for the corresponding row type (rows 13 and 17) to an internal table.
The indices in the rows 5 to 7 refer to entries in the name table TD-NAMES. If you look, e.g., at row 3, you find the corresponding component name in TD-NAMES from row 7 (NAME) onward and the corresponding user type from row 5 (NAME_STRUC) onward.
In the name table TD-NAMES you find the following entries. Note that the names SALARY_PER_MONTH and ABSENCE_TIME_STRUC are stored in two parts:
    |CONTINUE|NAME                   |CONTINUE|NAME
|--|     -||--
1 |        |DESCTEST            12 |        |PHONE
2 |        |EMPLOYEE_STRUC      13 |        |FIRST
3 |        |SBOOK-CUSTOMID      14 |        |LAST
4 |        |==ALPHA             15 |        |STREET
5 |        |NAME_STRUC          16 |        |ZIPCODE
6 |        |ID                  17 |        |PLACE
7 |        |NAME                18 |   *    |ABSENCE_TIME_ST
8 |        |ADDRESS             19 |        |RUC
9 |   *    |SALARY_PER_MONT     20 |        |DAY
10 |        |H                   21 |        |FROM
11 |        |ABSENT              22 |        |TO

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