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Program Examples
There are a number of examples located in the samples directory of your OSS ASN.1 Tools for C++ software installation. The best ones to start with are the encode and decode examples from the samples/basic directory. These are simple applications that demonstrate basic OSS ASN.1 Tools operations, including how to
We stand with Ukraine
BCAS DEFINITIONS ::= BEGIN
CareerEntry ::= SEQUENCE {
from INTEGER (0..MAX),
to INTEGER (0..MAX) OPTIONAL, -- absence means 'till now'
team VisibleString (SIZE (1..256))
}
BBCard ::= SEQUENCE {
name VisibleString (SIZE (1..64)),
age INTEGER (1..128),
position VisibleString (SIZE (1..64)),
career SEQUENCE OF CareerEntry
}
END
Compile the ASN.1 specification above using the OSS ASN.1/C++ compiler:
asn1cpp bcas -ber
The following header file is generated:
/*************************************************************/
/* Copyright (C) 2015 OSS Nokalva, Inc. All rights reserved.*/
/*************************************************************/
/* THIS FILE IS PROPRIETARY MATERIAL OF OSS NOKALVA, INC.
* AND MAY BE USED ONLY BY DIRECT LICENSEES OF OSS NOKALVA, INC.
* THIS FILE MAY NOT BE DISTRIBUTED.
* THIS COPYRIGHT STATEMENT MAY NOT BE REMOVED. */
/* Generated for: Open Systems Solutions */
/* Abstract syntax: bcas */
/* Created: Wed Apr 15 13:52:04 2015 */
/* ASN.1/C++ compiler version: 6.1 */
/* Code generated for runtime version 6.1 or later */
/* Compiler operating system: Windows X64 */
/* Compiler machine type: AMD64 */
/* Target operating system: Windows X64 */
/* Target machine type: AMD64 */
/* C++ compiler options required: None */
/* ASN.1 compiler options and file names specified:
* -ber bcas
*/
#ifndef OSS_bcas
#define OSS_bcas
#include "oss.h"
#include "asn1.h"
/* Representation types */
class OSS_PUBLIC CareerEntry /* SEQUENCE */
{
public:
void * operator new(size_t size);
void operator delete(void *ptr);
typedef OSS_UINT32 from;
typedef OSS_UINT32 to;
typedef OssString team;
CareerEntry();
CareerEntry(const CareerEntry &);
CareerEntry(from, to, const team &);
CareerEntry(from, const team &);
CareerEntry & operator = (const CareerEntry &);
int operator == (const CareerEntry &) const;
int operator != (const CareerEntry &) const;
from & get_from();
from get_from() const;
void set_from(from);
to *get_to();
const to *get_to() const;
void set_to(to);
int to_is_present() const;
void omit_to();
team & get_team();
const team & get_team() const;
void set_team(const team &);
private:
OSS_UINT32 bit_mask;
from from_field;
to to_field;
team team_field;
};
class OSS_PUBLIC __seqof1 : public OssList /* SEQUENCE OF */
{
public:
typedef CareerEntry component;
__seqof1();
__seqof1(const __seqof1 &);
~__seqof1();
__seqof1 & operator = (const __seqof1 &);
int operator == (const __seqof1 &) const;
int operator != (const __seqof1 &) const;
component *at(OssIndex);
const component *at(OssIndex) const;
OssIndex prepend(const component & );
OssIndex prepend(__seqof1 *);
OssIndex insert_after(OssIndex, const component & );
OssIndex insert_after(OssIndex, __seqof1 *);
int remove_front();
int remove_after(OssIndex);
__seqof1 *extract_after(OssIndex, OssIndex);
};
class OSS_PUBLIC BBCard /* SEQUENCE */
{
public:
void * operator new(size_t size);
void operator delete(void *ptr);
typedef OssString name;
typedef OSS_UINT32 age;
typedef OssString position;
typedef __seqof1 career;
BBCard();
BBCard(const BBCard &);
BBCard(const name &, age, const position &, const career &);
BBCard & operator = (const BBCard &);
int operator == (const BBCard &) const;
int operator != (const BBCard &) const;
name & get_name();
const name & get_name() const;
void set_name(const name &);
age & get_age();
age get_age() const;
void set_age(age);
position & get_position();
const position & get_position() const;
void set_position(const position &);
career & get_career();
const career & get_career() const;
void set_career(const career &);
private:
name name_field;
age age_field;
position position_field;
career career_field;
};
/* Universal PDU class */
class OSS_PUBLIC bcas_PDU : public UniversalPDU {
public:
bcas_PDU();
void set_BBCard(BBCard &);
BBCard *get_BBCard() const;
#ifdef OSS_PREALLOCATED_BUFFER_DECODE_SUPPORTED
void set_const_BBCard(const BBCard &);
const BBCard *get_const_BBCard() const;
#endif
};
/* Specific PDU classes */
class OSS_PUBLIC BBCard_PDU : public ConcretePDU {
public:
BBCard_PDU();
void set_data(BBCard &);
BBCard *get_data() const;
#ifdef OSS_PREALLOCATED_BUFFER_DECODE_SUPPORTED
void set_const_data(const BBCard & d);
const BBCard *get_const_data() const;
#endif
protected:
OssTypeIndex get_index() const;
};
/* Control object class */
class OSS_PUBLIC bcas_Control : public OssControl {
public:
bcas_Control();
bcas_Control(const bcas_Control &);
};
#endif // OSS_bcas
NOTE: The predefined OSS_PREALLOCATED_BUFFER_DECODE_SUPPORTED macro reflects the current ASN.1/C++ runtime configuration; do not change it.
The ASN.1/C++ compiler also produces the bcas.cpp file that implements the methods declared in this header file and contains the encoder/decoder control table. The contents of this file are not listed here, but you can create and view it if you wish.
The following simple test program, basic/encode/encode.cpp, uses a header file similar to the one above for encoding:
/*************************************************************************/
/* Copyright (C) 2014 OSS Nokalva, Inc. All rights reserved. */
/*************************************************************************/
/* THIS FILE IS PROPRIETARY MATERIAL OF OSS NOKALVA, INC. */
/* AND MAY BE USED ONLY BY DIRECT LICENSEES OF OSS NOKALVA, INC. */
/* THIS FILE MAY NOT BE DISTRIBUTED. */
/* THIS COPYRIGHT STATEMENT MAY NOT BE REMOVED. */
/*************************************************************************/
/*
* FILE: @(#)encode.cpp 16.2 14/02/08
*/
/*
* Encodes a sample baseball card using BCAS (Baseball Card Abstract Syntax).
* with BER or PER (Basic or Packed Encoding Rules).
*/
#include "bcas.h" /* compiler-generated header file */
/*
* A class used to report ASN.1/C++ errors to the application. It is up to
* the application programmer to decide which class to use for this purpose.
* You may choose any different class (such as a descendant of the
* std::exception class). You may also throw integer codes without defining
* any class (however, we expect that most applications will use exception
* classes).
*/
class ASN1Exception {
private:
int code;
public:
ASN1Exception(int asn1_code);
ASN1Exception(const ASN1Exception & that);
int get_code() const;
};
ASN1Exception::ASN1Exception(int asn1_code)
{
code = asn1_code;
}
ASN1Exception::ASN1Exception(const ASN1Exception & that)
{
code = that.code;
}
int ASN1Exception::get_code() const
{
return code;
}
/*
* The ASN.1/C++ error reporting function.
*/
void throw_error(int code)
{
throw ASN1Exception(code);
}
/*
* A helper function to create an object to be encoded.
*/
static BBCard *newCard(const char *name, int age, const char *position,
int c_from, int c_to, const char *c_team);
/*
* A helper function to print error message and textual description of
* the code returned by any runtime API function.
*/
static int report_error(OssControl *ctl, const char *where, ASN1Exception &exc);
/*
* Creates and encodes a baseball card PDU.
*/
int main()
{
int code = 0; /* return code */
BBCard *card = NULL; /* pointer to undecoded data */
const char *where; /* current operation -
used to print error messages if needed */
/*
* Handle ASN.1/C++ runtime errors with C++ exceptions.
*/
asn1_set_error_handling(throw_error, TRUE);
where = "initialization";
try {
bcas_Control ctl; /* ASN.1/C++ control object */
try {
EncodedBuffer encodedData; /* encoded data */
BBCard_PDU pdu; /* coding container for a BBCard value */
ossEncodingRules encRule; /* default encoding rules */
where = "initial settings";
#ifdef RELAXED_MODE
/*
* Set relaxed mode.
*/
ctl.setEncodingFlags(NOCONSTRAIN | RELAXBER | RELAXPER);
ctl.setDecodingFlags(NOCONSTRAIN | RELAXBER | RELAXPER);
#endif
ctl.setEncodingFlags(ctl.getEncodingFlags() | DEBUGPDU);
ctl.setDecodingFlags(ctl.getDecodingFlags() | DEBUGPDU);
/*
* Get the encoding rule, which is set currently.
*/
encRule = ctl.getEncodingRules();
/*
* Create the instance of BBCard class to be encoded.
*/
printf("Creating the PDU object to be encoded...");
where = "creating sample object";
card = newCard("Casey", 32, "left field",
2000, 2005, "New York Yankees");
printf(" success\n\n");
/*
* Set the data to the coding container.
*/
pdu.set_data(*card);
/*
* Print the input to the encoder.
*/
printf("The input to the encoder...\n\n");
where = "printing";
pdu.print(ctl);
/*
* Encode the object.
*/
printf("\nThe encoder's trace messages (only for SOED)...\n\n");
where = "encoding";
pdu.encode(ctl, encodedData);
printf("\nPDU encoded successfully.\n");
/*
* Printing the encoded PDU.
*/
printf("\n%s-Encoded PDU...\n\n",
encRule == OSS_BER ? "BER": "PER");
where = "printing";
encodedData.print_hex(ctl);
} catch (ASN1Exception &exc) {
/*
* An error occurred during decoding.
*/
code = report_error(&ctl, where, exc);
}
} catch (ASN1Exception &exc) {
/*
* An error occurred during control object initialization.
*/
code = report_error(NULL, where, exc);
} catch (...) {
/*
* An unexpected exception is caught.
*/
printf("Unexpected exception caught.\n");
code = -1;
}
/*
* Delete the decoded data (if there are any).
*/
delete card;
/*
* The encoder's output buffer was automatically allocated.
* It should be deallocated by the encodedData's destructor,
* so we don't need to delete it explicitly.
*/
return code;
}
/*
* FUNCTION report_error() is a common interface for error handling.
*
* PARAMETERS
* ctl OSS control object (NULL if the error occurred during
* initialization)
* where the error origin
* exc the exception object
*
* RETURNS the value of the return code
*/
static int report_error(OssControl *ctl, const char *where, ASN1Exception &exc)
{
int code = exc.get_code();
const char *msg;
if (!code)
/* success */
return 0;
printf("\nAn error happened\n Error origin: %s\n Error code: %d\n",
where, code);
if (ctl) {
msg = ctl->getErrorMsg();
if (msg && *msg)
printf(" Error text: '%s'\n", msg);
}
return code;
}
/*
* FUNCTION newCard() creates a Baseball card representation object
* with given component values. Input string values are copied.
*
* PARAMETERS
* name, age, position, c_from, c_to, c_team
* specify the components of the object to be created
*
* RETURNS a pointer to the created object
*/
static BBCard *newCard(const char *name, int age, const char *position,
int c_from, int c_to, const char *c_team)
{
BBCard::career career;
/*
* OssString has a constructor with one const char * argument,
* so the implicit conversion takes place for name, position,
* and team here.
*/
CareerEntry entry(c_from, c_to, c_team);
career.prepend(entry);
return new BBCard(name, age, position, career);
}
Compile and link the generated code; follow the instructions in the samples/basic/encode/README.TXT file. Here is the full output of the executable file:
Creating the PDU object to be encoded... success
The input to the encoder...
value BBCard ::=
{
name "Casey",
age 32,
position "left field",
career
{
{
from 2000,
to 2005,
team "New York Yankees"
}
}
}
The encoder's trace messages (only for SOED)...
BBCard SEQUENCE: tag = [UNIVERSAL 16] constructed; length = 52
name VisibleString: tag = [UNIVERSAL 26] primitive; length = 5
"Casey"
age INTEGER: tag = [UNIVERSAL 2] primitive; length = 1
32
position VisibleString: tag = [UNIVERSAL 26] primitive; length = 10
"left field"
career SEQUENCE OF: tag = [UNIVERSAL 16] constructed; length = 28
CareerEntry SEQUENCE: tag = [UNIVERSAL 16] constructed; length = 26
from INTEGER: tag = [UNIVERSAL 2] primitive; length = 2
2000
to INTEGER: tag = [UNIVERSAL 2] primitive; length = 2
2005
team VisibleString: tag = [UNIVERSAL 26] primitive; length = 16
"New York Yankees"
PDU encoded successfully.
BER-Encoded PDU...
30341A05 43617365 79020120 1A0A6C65 66742066 69656C64 301C301A 020207D0
020207D5 1A104E65 7720596F 726B2059 616E6B65 6573
Similarly, the following test program from the basic/decode directory illustrates decoding:
/**************************************************************************/
/* Copyright (C) 2014 OSS Nokalva, Inc. All rights reserved. */
/**************************************************************************/
/* THIS FILE IS PROPRIETARY MATERIAL OF OSS NOKALVA, INC. */
/* AND MAY BE USED ONLY BY DIRECT LICENSEES OF OSS NOKALVA, INC. */
/* THIS FILE MAY NOT BE DISTRIBUTED. */
/* THIS COPYRIGHT STATEMENT MAY NOT BE REMOVED. */
/**************************************************************************/
/*
* FILE: @(#)decode.cpp 16.2 14/02/08
*/
/*
* Decodes BER and PER encoded baseball card using BCAS (Baseball Card
* Abstract Syntax).
*/
#include "bcas.h" /* compiler-generated header file */
/*
* Input encodings.
*/
int berDataLen = 54;
int perDataLen = 43;
unsigned char berEncodedData[] = {
0x30, 0x34, 0x1A, 0x05, 0x43, 0x61, 0x73, 0x65, 0x79, 0x02,
0x01, 0x20, 0x1A, 0x0A, 0x6C, 0x65, 0x66, 0x74, 0x20, 0x66,
0x69, 0x65, 0x6C, 0x64, 0x30, 0x1C, 0x30, 0x1A, 0x02, 0x02,
0x07, 0xD0, 0x02, 0x02, 0x07, 0xD5, 0x1A, 0x10, 0x4E, 0x65,
0x77, 0x20, 0x59, 0x6F, 0x72, 0x6B, 0x20, 0x59, 0x61, 0x6E,
0x6B, 0x65, 0x65, 0x73
};
unsigned char perEncodedData[] = {
0x10, 0x43, 0x61, 0x73, 0x65, 0x79, 0x3E, 0x48, 0x6C, 0x65,
0x66, 0x74, 0x20, 0x66, 0x69, 0x65, 0x6C, 0x64, 0x01, 0x80,
0x02, 0x07, 0xD0, 0x02, 0x07, 0xD5, 0x0F, 0x4E, 0x65, 0x77,
0x20, 0x59, 0x6F, 0x72, 0x6B, 0x20, 0x59, 0x61, 0x6E, 0x6B,
0x65, 0x65, 0x73
};
/*
* A class used to report ASN.1/C++ errors to the application. It is up to
* the application programmer to decide which class to use for this purpose.
* You may choose any different class (such as a descendant of the
* std::exception class). You may also throw integer codes without defining
* any class (however, we expect that most applications will use exception
* classes).
*/
class ASN1Exception {
private:
int code;
public:
ASN1Exception(int asn1_code);
ASN1Exception(const ASN1Exception & that);
int get_code() const;
};
ASN1Exception::ASN1Exception(int asn1_code)
{
code = asn1_code;
}
ASN1Exception::ASN1Exception(const ASN1Exception & that)
{
code = that.code;
}
int ASN1Exception::get_code() const
{
return code;
}
/*
* The ASN.1/C++ error reporting function.
*/
void throw_error(int code)
{
throw ASN1Exception(code);
}
/*
* printCard() accesses components of the decoded data and prints them.
*/
static void printCard(BBCard *card);
/*
* A helper function to print error message and
* textual description of the code returned by any runtime API function.
*/
static int report_error(OssControl *ctl, const char *where, ASN1Exception &exc);
/* Decodes PER and BER encoded cards */
int main()
{
int code = 0; /* return code */
BBCard *cardPtr = NULL; /* pointer to decoded data */
/*
* Handle ASN.1/C++ runtime errors with C++ exceptions.
*/
asn1_set_error_handling(throw_error, TRUE);
try {
bcas_Control ctl; /* ASN.1/C++ control object */
try {
EncodedBuffer encodedData; /* encoded data */
BBCard_PDU pdu; /* coding container for a BBCard value */
int encRule; /* default encoding rules */
#ifdef RELAXED_MODE
/*
* Set relaxed mode.
*/
ctl.setEncodingFlags(NOCONSTRAIN | RELAXBER | RELAXPER);
ctl.setDecodingFlags(NOCONSTRAIN | RELAXBER | RELAXPER);
#endif
ctl.setEncodingFlags(ctl.getEncodingFlags() | DEBUGPDU);
ctl.setDecodingFlags(ctl.getDecodingFlags() | DEBUGPDU);
/*
* Do decoding. Note that API is the same for any encoding method.
* Get encoding rules which were specified on the ASN.1 compiler
* command line.
*/
encRule = ctl.getEncodingRules();
/*
* Set the decoder's input.
*/
if (encRule == OSS_BER) {
encodedData.set_buffer(berDataLen, (char *)berEncodedData);
} else if (encRule == OSS_PER_ALIGNED) {
encodedData.set_buffer(perDataLen, (char *)perEncodedData);
}
/*
* Print the encoded message.
*/
printf("Printing the %s-encoded PDU...\n\n",
encRule == OSS_BER ? "BER": "PER");
encodedData.print_hex(ctl);
/*
* Decode the encoded PDU whose encoding is in "encodedData".
* An exception will be thrown on any error.
*/
printf("\nThe decoder's trace messages (only for SOED)...\n\n");
pdu.decode(ctl, encodedData);
/*
* Read and print the decoded data.
*/
cardPtr = pdu.get_data();
printCard(cardPtr);
} catch (ASN1Exception &exc) {
/*
* An error occurred during decoding.
*/
code = report_error(&ctl, "decode", exc);
}
} catch (ASN1Exception &exc) {
/*
* An error occurred during control object initialization.
*/
code = report_error(NULL, "initialization", exc);
} catch (...) {
/*
* An unexpected exception is caught.
*/
printf("Unexpected exception caught.\n");
code = -1;
}
/*
* Delete the decoded data (if there are any).
*/
delete cardPtr;
return code;
}
/*
* FUNCTION report_error() is a common interface for error handling.
*
* PARAMETERS
* ctl OSS control object (NULL if the error occurred during
* initialization)
* where the error origin
* exc the exception object
*
* RETURNS the value of the return code
*/
static int report_error(OssControl *ctl, const char *where, ASN1Exception &exc)
{
int code = exc.get_code();
const char *msg;
if (!code)
/* success */
return 0;
printf("\nAn error happened\n Error origin: %s\n Error code: %d\n",
where, code);
if (ctl) {
msg = ctl->getErrorMsg();
if (msg && *msg)
printf(" Error text: '%s'\n", msg);
}
return code;
}
#define CURRENT_YEAR 2006
static void print_string(OssString &str);
/*
* FUNCTION printCard() prints contents of a Baseball card object in
* a human readable form. Besides that, it demonstrates how
* to access components of the decoded data. If you need no more
* than human readable printout of the decoded data, there is an
* easier way: it can be printed in the form of value notation
* using ASN1Handle::print() OSS ASN.1/C++ API method instead.
* PARAMETERS
* card the object to dump
*/
static void printCard(BBCard *card)
{
int count = 1;
BBCard::career *career;
OssIndex index;
printf("\nBaseball card\n-------------\n");
printf(" Name: ");
print_string(card->get_name());
printf("\n Age: %d\n", card->get_age());
printf(" Position: ");
print_string(card->get_position());
printf("\n");
career = &card->get_career();
index = career->first();
if (index != OSS_NOINDEX) {
printf(" Career:\n");
do {
CareerEntry *ce = career->at(index);
printf(" #%d: %d - %d: ",
count,
ce->get_from(),
ce->to_is_present() ?
*ce->get_to() :
CURRENT_YEAR);
print_string(ce->get_team());
printf("\n");
count++;
index = career->next(index);
} while (index != OSS_NOINDEX);
}
}
/*
* FUNCTION print_string() prints contents of an OssString object in
* a human readable form (this may be done simpler by using
* the standard std::string class but we avoid STL in the
* sample).
* PARAMETERS
* str the object to dump
*/
static void print_string(OssString &str)
{
const char *text = str.get_buffer();
if (text) {
for (unsigned int i = 0; i < str.length(); i++)
printf("%c", text[i]);
} else
printf("[unknown]");
}
Compile and link the generated code; follow the instructions in the samples/basic/decode/README.TXT file. Here is the full output of the executable file:
Printing the BER-encoded PDU...
30341A05 43617365 79020120 1A0A6C65 66742066 69656C64 301C301A 020207D0
020207D5 1A104E65 7720596F 726B2059 616E6B65 6573
The decoder's trace messages (only for SOED)...
BBCard SEQUENCE: tag = [UNIVERSAL 16] constructed; length = 52
name VisibleString: tag = [UNIVERSAL 26] primitive; length = 5
"Casey"
age INTEGER: tag = [UNIVERSAL 2] primitive; length = 1
32
position VisibleString: tag = [UNIVERSAL 26] primitive; length = 10
"left field"
career SEQUENCE OF: tag = [UNIVERSAL 16] constructed; length = 28
CareerEntry SEQUENCE: tag = [UNIVERSAL 16] constructed; length = 26
from INTEGER: tag = [UNIVERSAL 2] primitive; length = 2
2000
to INTEGER: tag = [UNIVERSAL 2] primitive; length = 2
2005
team VisibleString: tag = [UNIVERSAL 26] primitive; length = 16
"New York Yankees"
Baseball card
-------------
Name: Casey
Age: 32
Position: left field
Career:
#1: 2000 - 2005: New York Yankees
Following is an example using the OssZlibCompressor class. A more comprehensive and build-ready compression example is available in the samples/advanced/compression directory.
M DEFINITIONS ::= BEGIN S ::= IA5String s S ::= "Hello world! Hello world! Hello world! Hello world" -- the value above will be compressed at runtime END
asn1cpp sample -per -soed
Create a C++ source file with the following content:
#include "sample.h"
int main() {
sample_Control ctl;
int rc;
unsigned long flag = OSS_RELAXED | DEBUGPDU | AUTOMATIC_ENCDEC;
ctl.setEncodingRules(OSS_PER_ALIGNED);
ctl.setEncodingFlags(flag);
ctl.setDecodingFlags(flag);
// to use default compression level
OssCompressor *compressor = new OssZlibCompressor();
ctl.setCompressor(compressor);
S_PDU pdu;
S mydata(s);
EncodedBuffer eb;
pdu.set_data(mydata);
printf("Data to be encoded is: \n");
pdu.print(ctl);
// encode the data
rc = pdu.encode(ctl, eb);
if (rc) {
printf("Encoding Failed with code: %d \n", rc);
} else {
printf("Data is Encoded Successfully....\n\n");
ctl.printHex(eb.get_data(), eb.get_data_size());
}
printf("Now try to Decode the Encoded Data...\n\n");
rc = pdu.decode(ctl, eb);
if(rc) {
printf("FAILED Decoding the encoded Data.\n");
} else {
printf("\nDecoded the EncodedData successfully.\n\n");
pdu.print(ctl);
pdu.free_data(ctl);
}
delete compressor;
return rc;
}
Compile and link all the C++ source files using development tools appropriate for your target platform. Refer to samples/advanced/compression/makefile for details.
Sample Output: Data to be encoded is: value S ::= "Hello world! Hello world! Hello wor ..." Data is Encoded Successfully.... 3318789C 33F248CD C9C95728 CF2FCA49 5154208A 0300CA6E 11E6 Now try to Decode the Encoded Data... Decoded the EncodedData successfully. value S ::= "Hello world! Hello world! Hello wor ..."
↩Sample_Compression_Programs menu
Using a custom compressor is illustrated by the BookCompressor class (see usercomp.h and usercomp.cpp in the samples/advanced/compression directory). This program is the same as the previous example that uses the OssZlibCompressor class, with the following differences:
The BookCompressor interface is declared in usercomp.h:
#include "asn1.h"
class BookCompressor : virtual public OssCompressor {
public:
BookCompressor();
int compress(void *inbuf, size_t inlen, void *outbuf, size_t *outlen);
int decompress(void *inbuf, size_t inlen, void *outbuf, size_t *outlen);
size_t compress_estimate(void *inbuf, size_t inlen);
private:
unsigned char key;
};
The custom compressor methods are implemented in usercomp.cpp.
The custom class can be instantiated and used instead of OssZlibCompressor (see tbookusr.cpp):
OssCompressor *compressor = new BookCompressor; ctl.setCompressor(compressor);
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This documentation applies to release 7.3 and later of the OSS® ASN.1 Tools for C++.
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