Documentation for filter parameters
------------------------------------

1. ASCII Hex encoder (PDF_STM_FILTER_AHEX_ENC)
--
The ascii encoder uses no parameters.

2. ASCII Hex decoder (PDF_STM_FILTER_AHEX_DEC)
--
The acsii decoder uses no parameters.


3. Run-Length encoder (PDF_STM_FILTER_RL_ENC)
--
The run-length encoder uses no parameters.

4. Run-Length decoder (PDF_STM_FILTER_RL_DEC)
--
The run-length decoder simpy uses the encoder, therefore it uses no parameters.


#########
NOTE:

Parameters specified in the ISO PDF document for the flate and lzw decoders are given below:
(Mentioned here separately, as the source does not seem to use all the parameters.)
All parameters are optional.

Param name		Type
=================	==================================
Predictor		integer
Colors			integer (Maybe used if Predictor > 1)
BitsPerComponent	integer (Maybe used if Predictor > 1)
Columns			integer (Maybe used if Predictor > 1)
EarlyChange		integer (LZW only)

#########

5. Flate (zlib) encoder (PDF_STM_FILTER_FLATE_ENC)
--
The flate encoder uses no parameters currently.

6. Flate (zlib) decoder (PDF_STM_FILTER_FLATE_DEC)
--
The flate decoder uses no parameters currently.

7. LZW encoder (PDF_STM_FILTER_LZW_ENC)
--
The LZW encoder uses the following optional parameters.

Param name		Type				Default Value
=================	=====================		==================
EarlyChange		pdf_char_t *			1

8. LZW decoder (PDF_STM_FILTER_LZW_DEC)
--
The LZW decoder uses the following optional parameters.

Param name		Type				Default Value
=================	=====================		==================
EarlyChange		pdf_char_t *			1


#########
NOTE:

Parameters specified for the jbig2 decoder in the iso pdf document.

Param name		Type				Default Value
=================	=====================		==================
JBIG2Globals		stream				N/A

#########

9. JBIG2 decoder (PDF_STM_FILTER_JBIG2_DEC)
--
The JBIG2 decoder uses the following optional parameters.

Param name		Type				Default Value
=================	=====================		==================
GlobalStreamsSize	pdf_size_t *			N/A
GlobalStreamsBuffer	pdf char t **			N/A

#########
NOTE:

The ISO pdf document does not discuss the aesv2 and v2 encoder/decoder in the filters section.
Although, there is a crypt filter mentioned which uses two parameters - Name & Type.

#########

10. AESV2 encoder (PDF_STM_FILTER_AESV2_ENC)
--
The AESV2 encoder uses the following mandatory parameters.

Param name		Type				Default Value
=================	=====================		==================
KeySize			pdf_size_t *			N/A
Key			pdf char t **			N/A

11. AESV2 decoder (PDF_STM_FILTER_AESV2_DEC)
--
The AESV2 decoder uses the following mandatory parameters.

Param name		Type				Default Value
=================	=====================		==================
KeySize			pdf_size_t *			N/A
Key			pdf char t **			N/A

12. V2 encoder (PDF_STM_FILTER_V2_ENC)
--
The V2 encoder uses the following mandatory parameters.

Param name		Type				Default Value
=================	=====================		==================
KeySize			pdf_size_t *			N/A
Key			pdf char t **			N/A

13. V2 decoder (PDF_STM_FILTER_V2_ENC)
The V2 decoder uses the following mandatory parameters.

Param name		Type				Default Value
=================	=====================		==================
KeySize			pdf_size_t *			N/A
Key			pdf char t **			N/A

14. MD5 encoder (PDF_STM_FILTER_MD5_ENC)
--
The md5 encoder uses no parameters.

15. A85 encoder
--
This encoder exists only in the source code and is not mentioned in the documentation.
Although it seems to be related to the ASCII85 filter mentioned in the ISO PDF document.