Rexx/EEC Reference. Version 1.4. Copyright (C) 2017 Mark Hessling
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1 Rexx/EEC Reference Version 1.4 Copyright (C) 2017 Mark Hessling
2 Rexx/EEC Reference Table of Contents TABLE OF CONTENTS.1 1. RexxEEC/Introduction [ Modules ] RexxEEC/Constants [ Modules ].3 3. Functions/Encode-Decode [ Modules ] Encode-Decode/EECencode [ Functions ] Encode-Decode/EECdecode [ Functions ].5 4. Functions/Encrypt-Decrypt [ Modules ] Encrypt-Decrypt/EECencrypt [ Functions ] Encrypt-Decrypt/EECdecrypt [ Functions ] Functions/Compress-Decompress [ Modules ] Compress-Decompress/EECcompress [ Functions ] Compress-Decompress/EECdecompress [ Functions ]10 6. Functions/General [ Modules ] General/EECcrc [ Functions ] General/EECmd [ Functions ] General/EEChtdigest [ Functions ] General/EECsha [ Functions ] Functions/PackageManagement [ Modules ] PackageManagement/EECLoadFuncs [ Functions ] PackageManagement/EECdropfuncs [ Functions ] PackageManagement/EECvariable [ Functions ] PackageManagement/EECQueryFunction [ Functions ]..title i
3 1. RexxEEC/Introduction [ Modules ] [ Top ] [ Modules ] DESCRIPTION Rexx/EEC is an external function package that provides functions for Encrypting, Encoding and Compressing Rexx strings. The opposite functionality; Decrypting, Decoding and Decompressing is also provided by this function package. USAGE To make the external functions available add the following lines before: the first call to one of the functions in the package: Call RxFuncAdd 'EECLoadFuncs', 'rexxeec', 'EECLoadFuncs' Call EECLoadFuncs TODO BUGS add external bzip2 compression? speed up BlowFish by running BlowFish_Init once for each key provided there are some memory leaks PORTABILITY Rexx/EEC runs on Windows 9x/Me/NT/2k/XP, OS/ and on any Un*x platform Rexx/EEC lives at COPYRIGHT Rexx/EEC is Copyright(C) 2008 Mark Hessling <mark@rexx.org> The compression code in the "zlib" directory is Copyright (C) Jean-loup Gailly and Mark Adler. The encryption code in the "des" directory is Copyright (C) Eric Young. The encryption code in the "blowfish" directory is Copyright (C) 1997 Paul Kocher. 1. RexxEEC/Introduction [ Modules ] 1
4 2. RexxEEC/Constants [ Modules ] [ Top ] [ Modules ] Package Constants DESCRIPTION The following "constants" are defined when RexxEEC starts. By default, all constants are stored in an array with the stem preset to!rexxeec.! This can be changed by using the 'CONSTANTPREFIX' value of EECvariable(). If you use "Procedure" on your labels, you MUST "EXPOSE!REXXEEC." or the stem you set with EECvariable() will not be visible. To reference the constants defined below, you must prefix them. So the "constant" ENCRYPT_TYPES would be, by default, referenced in your code as!rexxeec.!encrypt_types. EECvariable ATTRIBUTES INTCODE - the error code from the last function call INTERRM - the error message from the last function call ENCRYPT_TYPES - a list of words identifying the valid encryption types COMPRESS_TYPES - a list of words identifying the valid compression types 2. RexxEEC/Constants [ Modules ] 2
5 3. Functions/Encode-Decode [ Modules ] [ Top ] [ Modules ] DESCRIPTION The following functions encode and decode a string to and from an encoded format. Encoding generally converts 8 bit characters into printable characters for electronic transmission. As a result the encoded string is longer than the raw string. USAGE EECencode and EECdecode are symmetrical. ie: EECdecode( EECencode( str ) ) == str NOTES For UUencoding the length of the original string must be stored with the encoded string as the decoding mechanism has no way of knowing the original length of the string. Rexx/EEC prepends 4 bytes to the beginning of the returned encoded string which contains the original length of the string Encode-Decode/EECencode [ Functions ] [ Top ] [ Encode-Decode ] [ Functions ] EECencode encstr = EECencode( Str[, Type] ) Encodes Str to one of: a 7-bit string a Base64 string Str - the Rexx string to be encoded. Type - Optional. The encoding mechanism to be used. 'UU' (the default) or 'BASE64' Str encoded or blank if an error. 3. Functions/Encode-Decode [ Modules ] 3
6 Rexx/EEC Reference EECdecode,!REXXEEC.!INTERRM str = 'This is my string.' encstr = eecencode( str ) Say 'UUencoded string is: encstr 3.2. Encode-Decode/EECdecode [ Functions ] [ Top ] [ Encode-Decode ] [ Functions ] EECdecode str = EECdecode( EncStr[, Type] ) Decodes EncStr from a UU or BASE64 string. EncStr - The encoded string to decode. Type - Optional. The encoding mechanism to be used. 'UU' (the default) or 'BASE64' EncStr decoded or blank if an error. EECencode,!REXXEEC.!INTERRM str = 'This is my string.' encstr = eecencode( str, 'BASE64' ) samestr = eecdecode( encstr, 'BASE64' ) If samestr \== str Then Say 'error encoding/decoding' 3.1. Encode-Decode/EECencode [ Functions ] 4
7 4. Functions/Encrypt-Decrypt [ Modules ] [ Top ] [ Modules ] DESCRIPTION The following functions encrypt and decrypt a string using a specified algorithm and key. They provide symmetrical encryption functionality. USAGE Provided the same algorithm and key are used: EECdecrypt( EECencrypt( str, 'mykey', 'DES' ), 'mykey', 'DES' ) == str NOTES All encryption algorithm encrypt data in chunks of various sizes. Any string not an exact multiple will have spaces appended before the encryption takes place. As a result of this behaviour it is not possible to decrypt a string to its original value without the appended spaces. To overcome this problem, the encryption mechanism in Rexx/EEC prepends 4 bytes to the beginning of the returned encrypted string which contains the original length of the string. This is used by the decryption function to return the exact length of the original string that was encrypted. The builtin DES encryption algorithm does not work on 64bit machines Encrypt-Decrypt/EECencrypt [ Functions ] [ Top ] [ Encrypt-Decrypt ] [ Functions ] EECencrypt encstr = EECencrypt( Str, Key[, Type] ) Encrypts a Rexx string using the specified Key and encryption Type. Str - the Rexx string to be encrypted Key - the key to be used for encryption Type - Optional. DES, RIJNDAEL or BLOWFISH. BLOWFISH is default. 4. Functions/Encrypt-Decrypt [ Modules ] 5
8 The encrypted string. If an error occurs during encryption, the return value will be blank and an error available in the variable!rexxeec.!errmsg. EECdecrypt Rexx/EEC Reference encstr = eecencrypt( 'my secret data', 'mykey, 'DES' ) If encstr = '' Then Say 'Error encrypting'!rexxeec.!interrm 4.2. Encrypt-Decrypt/EECdecrypt [ Functions ] [ Top ] [ Encrypt-Decrypt ] [ Functions ] EECdecrypt str = EECdecrypt( EncStr, Key[, Type] ) Decrypts a Rexx string using the specified Key and encryption Type. EncStr - the Rexx string to be decrypted Key - the key to be used for decryption Type - Optional. DES, RIJNDAEL or BLOWFISH. BLOWFISH is default. The decrypted string. If an error occurs during decryption, the return value will be blank. EECencrypt str = eecdecrypt( '^^#((@#(', 'mykey' ) If str = '' Then Say 'Error decrypting'!rexxeec.!interrm 4.1. Encrypt-Decrypt/EECencrypt [ Functions ] 6
9 Rexx/EEC Reference 4.2. Encrypt-Decrypt/EECdecrypt [ Functions ] 7
10 5. Functions/Compress-Decompress [ Modules ] [ Top ] [ Modules ] DESCRIPTION The following functions compress and decompress a string using the specified algorithm. USAGE Provided the same algorithm is used: EECdecompress( EECdecompress( str ) ) == str NOTES For types prefixed vy "I-", the length of the original string must be stored with the compressed string as the decompression mechanism has no way of knowing the original length of the string. Rexx/EEC prepends 4 bytes to the beginning of the returned compressed string which contains the original length of the string. Types prefixed by "I-" are intended to be used by Rexx/EEC only. Strings compressed by type I-ZLIB or I-GZIP can only be decompressed by Rexx/EEC unless the 4 bytes prepending the compressed data is removed. Display the internal Rexx variable!rexxeec.!compress_types for the list of supported compression algorithms supported Compress-Decompress/EECcompress [ Functions ] [ Top ] [ Compress-Decompress ] [ Functions ] EECcompress cmpstr = EECcompress( Str[, Type] ) Compresses Str with the algorithm specified by Type. Str - the Rexx string to be compressed Type - Optional. I-ZLIB, I-GZIP. I-ZLIB is default. The compressed string. 5. Functions/Compress-Decompress [ Modules ] 8
11 Rexx/EEC Reference EECdecompress cmpstr = eeccompress( 'my big, fat data' ) If cmpstr = '' Then Say 'Error compressing'!rexxeec.!interrm 5.2. Compress-Decompress/EECdecompress [ Functions ] [ Top ] [ Compress-Decompress ] [ Functions ] EECdecompress str = EECdecompress( CmpStr[, Type] ) Decompresses CmpStr with the algorith specified by Type. CmpStr - the Rexx string to be decompressed Type - Optional. I-ZLIB, I-GZIP. I-ZLIB is default. The decompressed string. EECcompress str = eecdecompress( '*#*@', 'ZLIB' ) If str = '' Then Say 'Error decompressing'!rexxeec.!interrm 5.1. Compress-Decompress/EECcompress [ Functions ] 9
12 6. Functions/General [ Modules ] [ Top ] [ Modules ] DESCRIPTION The following functions are single direction algorithms that calculate various values General/EECcrc [ Functions ] [ Top ] [ General ] [ Functions ] EECcrc num = EECcrc( InStr[, Type[,Source]] ) Calculates the CRC for the supplied string or file specified by Type NOTES InStr - the Rexx string for which a CRC is to be calculated Type - Optional. See!REXXEEC.!CRC_TYPES for a full list. 16 is default. The calculated CRC. num = eeccrc( '*#*@', 16 ) Say 'CRC value is:' num 6.2. General/EECmd [ Functions ] [ Top ] [ General ] [ Functions ] 6. Functions/General [ Modules ] 10
13 Rexx/EEC Reference EECmd num = EECmd( InStr, Type[, Source] ) Calculates the Message Digest (MD) checksum for the supplied string or file InStr - the Rexx string or file for which an MD checksum is to be calculated Type - The Message Digest series. Currently only 5 is supported. Source - Optional. File or String. Default is String. The calculated MD. str = '*#*@' hash = eecmd( str, 5 ) Say 'MD value of string' str 'is:' hash filename = 'RexxEEC.tar.gz' hash = eecmd( filename, 5, 'File' ) Say 'MD value of file' filename 'is:' hash 6.3. General/EEChtdigest [ Functions ] [ Top ] [ General ] [ Functions ] EEChtdigest num = EEChtdigest( Action, Filename, Username, Realm[, Password] ) Provides similar functionality to the Apache htdigest command to manage passwords in a.htdigest file 6.2. General/EECmd [ Functions ] 11
14 Action - one of Add Change Delete indicating what action to carry out on the password entry Filename - the file to be manipulated Username - the user to manage Realm - the realm to which the user belongs Password - (optional) the password for the user. If not supplied the user will have to enter with keyboard 0 on success, any other value an error RFC2617 Rexx/EEC Reference rcode = eechtdigest( 'Add', '.htdigest', 'mark', 'rexx.org' ) -- user will be prompted to enter password using keyboard rcode = eechtdigest( 'Add', '.htdigest', 'mark', 'rexx.org', 'mypass' ) rcode = eechtdigest( 'C', '.htdigest', 'mark', 'rexx.org', 'newpass' ) 6.4. General/EECsha [ Functions ] [ Top ] [ General ] [ Functions ] EECsha num = EECsha( InStr[, Type[, Source]] ) Calculates the SHA1 hash for the supplied string or file InStr - the Rexx string or file for which a SHA1 hash is to be calculated Type - The SHA hash series. 1, or 256 Source - Optional. File or String. Default is String General/EEChtdigest [ Functions ] 12
15 The calculated SHA1 or SHA256 hash as a hex value. To get the "real" hash value call x2c() on the result from EECsha. Rexx/EEC Reference str = '*#*@' hash = eecsha( str ) Say 'SHA1 value (in hex) of string' str 'is:' hash filename = 'RexxEEC.tar.gz' hash = eecsha( filename, 1, 'File' ) Say 'SHA1 value (in hex) of file' filename 'is:' hash 6.4. General/EECsha [ Functions ] 13
16 7. Functions/PackageManagement [ Modules ] [ Top ] [ Modules ] DESCRIPTION These functions are common to most Rexx external function packages PackageManagement/EECLoadFuncs [ Functions ] [ Top ] [ PackageManagement ] [ Functions ] EECloadfuncs rcode = EECloadfuncs() Loads all other RexxEEC external functions None 0 in all cases EECdropfuncs 7.2. PackageManagement/EECdropfuncs [ Functions ] [ Top ] [ PackageManagement ] [ Functions ] EECdropfuncs 7. Functions/PackageManagement [ Modules ] 14
17 Rexx/EEC Reference rcode = EECdropfuncs(["UNLOAD"]) Cleans up RexxEEC environment and optionally will drop the external functions. UNLOAD - causes the external functions to be dropped. 0 in all cases EECloadfuncs 7.3. PackageManagement/EECvariable [ Functions ] [ Top ] [ PackageManagement ] [ Functions ] EECvariable rcode = EECvariable(Variable [,NewValue]) Get or set an internal RexxEEC variable. Variable - name of the variable to get or set. See NOTES for NewValue - the new value of "Variable", if the variable is settable When setting a variable, then 0 if success, any other value is an error When getting a variable, then the value of the variable is returned. NOTES The "Variable" argument can be one of: 7.2. PackageManagement/EECdropfuncs [ Functions ] 15
18 Rexx/EEC Reference DEBUG (settable) 0 - no debugging 1 - all Rexx variables set by RexxEEC are displayed as they are set 2 - all RexxEEC functions are traced on entry with argument values and on exit with the return value 4 - all internal RexxEEC functions are traced with their arguments (really only useful for developers) The values can be added together for a combination of the above details. DEBUGFILE (settable) Where any debugging output is written. By default this goes to the system's error stream; usually 'stderr'. CONSTANTPREFIX (settable) The variable name prefix for all RexxEEC constants. By default this is '!REXXEEC.!'. If you change this, it is useful to make the prefix result in stemmed variables; this makes it far easier to EXPOSE these constants. VERSION (readonly) The full version details of RexxEEC in the format: package version version_date Where: package - the string 'rexxeec' version - package version in n.n format; eg 1.0 version_date - date package was released in DATE('N') format Say 'We are running at debug level:' EECvariable( 'DEBUG' ) 7.4. PackageManagement/EECQueryFunction [ Functions ] [ Top ] [ PackageManagement ] [ Functions ] EECQueryFunction rcode = EECqueryfunction(FunctionName ResultArray[, Option]) Populates an array of all functions supplied by this package depending on Option FunctionName - the name of a function to query (no trailing period) ResultArray - the stem (trailing period) in which the list of functions is returned Option - one of 'R' (the default) for "registered" functions or 'A' for "available" functions 0 if successful or 1 if the FunctionName is not found 7.3. PackageManagement/EECvariable [ Functions ] 16
19 Rexx/EEC Reference NOTES To determine if a FunctionName can be executed in your code, pass the function name as the first argument, and 'R' as the second. If the function can be called the function returns 0, otherwise it returns PackageManagement/EECQueryFunction [ Functions ] 17
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