=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library v3.303+ TABLE OF CONTENTS stc.library/CrunchData * Not documented here.. Use CrunchDataTags() stc.library/DeCrunchData stc.library/AllocBuffer stc.library/FreeBuffer stc.library/QuickSort stc.library/AllocFileBuffer * Not documented here.. Use NewAllocFileBuffer() stc.library/FreeFileBuffer stc.library/LoadFileBuffer stc.library/ProcessHunks stc.library/SaveExec * Not documented here.. Use SaveExecTags() stc.library/LibDeCrunchPExec stc.library/CrunchDataTags stc.library/SaveExecTags stc.library/NewAllocFileBuffer stc.library/AllocMemBuffer stc.library/FileIs =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/DeCrunchData NAME DeCrunchData -- Decrunches data that was crunched with stc.library v2.0 -> 3.304 and upwards (S403 and S404) SYNOPSIS success = DeCrunchData( destination, source ) D0 -36 A0 A1 BOOL DeCrunchData( APTR destination, APTR source ); FUNCTION Decrunches stc.library crunched data (S403 and S404) from standard sourcefile to destination buffer. If both destination and source has separate memory regions there is no problem to decrunch data. If you need to save memory it's possible to decrunch over the source file. Take care you do the following: Decrunch memory buffer must be atleast file's original length + security length. You get both values from the beginning of the source file (the decrunch info header). Load source file to the beginning of the decrunch buffer and define destination address "security length" bytes ahead from the beginning of the decrunch buffer. Decrunch info header & decrunching: Every file crunched with stc.library v2.0+ has following header (16 bytes) at the beginning of the crunched data: "S404" or "S403".L ; cruncher version - string (four bytes) Security length.L ; overlap size - longword Original length.L ; decrunched length - longword Crunched length.L ; crunched length - longword . ; crunched data starts . . Security length is always 16 + something. There are also two control words at the end of crunched data. For historical reasons it's quite wierd. I'll explain it with a following picture: <<- Lower memory Higher memory ->> +------------ Crunched length ------------+ | | InfoHeader|......................LastWord|BitCounter|MaxBits ^ ^ ^ ^ | | | | Crunched data --+ | | | | | | Last crunched word --+ | | | | How many used bits there are in LastWord --+ | | Efficiency (not in S403) --+ If both crunched data and destination memory overlap there must be atleast 'Security length' distance between the start of the crunched data and the start of the destination memory: <<- Lower memory Higher memory ->> <<<-------------- Decrunching direction -------------- InfoHeader|......................LastWord|BitCounter|MaxBits ^ | |<------------ Destination memory starts here .... | | +-- SecLen ---+ | +---------------> Crunched data starts here.. INPUTS destination = pointer to the beginning of the memory you want to decrunch source = pointer to crunched data (must include the decrunch info header) RESULT success = TRUE if source was actually S403 or S404 crunched file FALSE if coulnd't find correct ID string SEE ALSO CrunchDataTags() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/AllocBuffer NAME AllocBuffer -- Alloc buffer for cruncher SYNOPSIS buffer AllocBuffer( version ) D0 -42 D0 BOOL AllocBuffer( ULONG version ); FUNCTION Allocates correct size of memory for cruncher's use. This buffer includes hash table and lookahead buffer. INPUTS version = current cruncher version. Use S404 at the moment. RESULT buffer = pointer to the buffer or NULL if allocation failed. SEE ALSO FreeBuffer(), CrunchDataTags() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/FreeBuffer NAME FreeBuffer -- Frees buffer allocated with AllocBuffer() SYNOPSIS FreeBuffer( buffer ) -48 A1 void FreeBuffer( APTR buffer ); FUNCTION Frees memory allocated with AllocBuffer(). INPUTS buffer = pointer to buffer SEE ALSO AllocBuffer() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/QuickSort NAME QuickSort -- Sort an array of numbers SYNOPSIS QuickSort( amount, array ) -54 D0 A0 void QuickSort( ULONG amount, ULONG *array ); FUNCTION Sorts an array of unsigned lonwords into ascending order. Uses fast quicksort algorithm. INPUTS amount = number of items in array array = pointer to the array of ULONGs NOTES This function uses recursion and may need a lot of stack space. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/FreeFileBuffer NAME FreeFileBuffer -- Frees memory allocated with AllocFileBuffer(), NewAllocFileBuffer() or AllocMemBuffer() SYNOPSIS FreeFileBuffer( filebuffer ) -66 A1 void FreeFileBuffer( APTR filebuffer ); FUNCTION Frees memory allocated with AllocFileBuffer(), NewAllocFileBuffer() or AllocMemBuffer(). INPUTS filebuffer = pointer buffer SEE ALSO AllocFileBuffer(), NewAllocFileBuffer(), AllocMemBuffer() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/LoadFileBuffer NAME LoadFileBuffer -- Load file into filebuffer SYNOPSIS length = LoadFileBuffer( filebuffer ) D0 -72 A0 ULONG LoadFileBuffer( APTR filebuffer ); FUNCTION Loads a file into buffer. Buffer must have been allocated with AllocFileBuffer() or NewAllocFileBuffer(). This function takes automatically care of placing data into correct place inside buffer (security length). INPUTS filebuffer = pointer to buffer allocated with AllocFilebuffer() or NewAllocFileBuffer() RESULT length = total bytes loaded or NULL if there was an error. In case of error read DOS errorcode from ErrorMsg. NOTES There are few hypotical cases when this function may return error without a reason. Firstly filebuffer includes information of the file to be loaded: file size, security length and name (path). If file size changes between NewAllocFileBuffer() and LoadFileBuffer() (some other task modifies the file) an error will be returned. This is because file won't stay locked after NewAllocFileBuffer(). If you use file names (paths) longer than 108 characters the name will be automatically truncated. So it's recommendent to change work directory instead just adding it to filename. BUGS Read also the note considering StcBase->ErrorMsg in include/libraries/stc.h. SEE ALSO AllocFileBuffer(), NewAllocFileBuffer() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/ProcessHunks NAME ProcessHunks -- Preprocess hunks of command file SYNOPSIS processedlength = ProcessHunks( length, filebuffer ) D0 -78 D0 A0 ULONG ProcessHunks( ULONG length, APTR filebuffer ); FUNCTION Converts hunks of command file to StoneCracker's own and much shorter form. Hunk_symbol, hunk_debug and hunk_ext will be removed and there's no way to get them back. Hunk preprocessor does the following for hunks: · All debug hunks generated by compiler are deleted (no way to get them back!). · There are no Hunk_ends · Hunk header info at the beginning of the file is modified to a shorter form: 1 longword = (total number of hunks)-1 (=n) n+1 longwords = hunksizes & memory type (as normally) · Hunk_code is converted to %01xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.L +-------- datasize>>2 -------+ · Hunk_data is converted to %11xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.L +-------- datasize>>2 -------+ · Hunk_bss is converted to %100000000000000000.W · Hunk_reloc start with %000000000000000000.W and then Repeat until (number of relocentries) = 0 1 word = number of relocentries (null if no relocs anymore) 1 word = relocate hunk number.. 1 longword = %bbbbbbbbxxxxxxxxxxxxxxxxxxxxxxxx.L ^ +----- First reloc ----+ | +--> Number of bytes to add to 'First reloc' 2 = 3 bytes per relocentry 4 or 6 = 2 bytes per relocentry 8 or 10 = 1 byte per relocentry ? = only one relocentry followed by (number of relocentries) %bbbbbbbb reloc- entries.. · End of processed hunks is %1111111111111111.W INPUTS length = size of file in filebuffer. filebuffer = buffer allocated with AllocFileBuffer() or NewAllocFileBuffer(). RESULT processedlength = size of the file after preprocessing or NULL if it's not possible to convert all hunks correctly. Read ErrorMsg for errorcode. Errorcodes are: phNOHEADER = file wasn't a command file. phNOMATCH = file is probably overlayed. Maximum number of hunks doesn't match to highest hunk. phUNIT = there was a hunk_unit. phNAME = there was a hunk_name (handled since v3.303) phREHEADER = there was hunk_header again. phOVERLAY = file is overlayed. phBREAK = file is overlayed. phHUNKID = unknown hunk ID. NOTE All command files _must_ be preprocessed if you want to decrunch them with stc.library's executable decrunchers. BUGS These are really not bugs but stc.library can't handle hunk_unit and new hunk types that came with Kickstart 2.0 and higher. Also it's not possible to preprocess overlayed files. Read also the note considering StcBase->ErrorMsg in include/libraries/stc.h. SEE ALSO AllocFileBuffer(), NewAllocFileBuffer(), LoadFileBuffer() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/LibDeCrunchPExec NAME LibDeCrunchPExec -- decrunches crunched command file SYNOPSIS LibDeCrunchPExec( hunk1, seglist ) -90 A3 A4 void LibDeCrunchPExec( APTR hunk1, APTR seglist ); FUNCTION Decrunches and relocates crunched command file. Function also takes care of hunk mess, memory managing and closing library. If decrunching succees decrunched program will be runned. Following assembly example (it's current library decruncher) shows how to use LibDeCrunchPExec(): * * First normal hunk stuff in front of command file.. * cnop 0,4 dc.l HUNK_HEADER ; It's command file dc.l 0 dc.l 2 ; Total number of hunks. dc.l 0 ; Lowest hunk dc.l 1 ; Highest hunk dc.l (ldH0End-ldH0Start)>>2 ; Size of the first code hunk ldH1MemSize: dc.l 0 ; Size of the second code hunk ; Code size + original file size + ; security length dc.l HUNK_CODE dc.l (ldH0End-ldH0Start)>>2 ; Size of the first code hunk * * Code of the first code hunk starts.. * ldH0Start: pea ldExit(pc) movem.l d0-a6,-(sp) lea ldH0Start-4(pc),a4 ; Address of this code hunk (seglist) move.l (a4),a3 add.l a3,a3 add.l a3,a3 ; Address of next code hunk jsr 18(a3) ; Call it.. 18 = 4 bytes of link ; to next hunk + 12 bytes of ; library name + 2 bytes to make ; code longword aligned.. movem.l (sp)+,d0-a6 ldExit: rts cnop 0,4 ldH0End: * * Hunk stuff in front of next hunk (segment) * dc.l HUNK_CODE ldH1DataSize: dc.l 0 ; Size of code & crunched data * * Code of the second code hunk & crunched data.. * ldH1Start: dc.b "stc.library",0,0,0 lea 4(a3),a1 ; Here we actually start.. moveq #STCVERSION,d0 ; = 3 move.l $04.w,a6 jsr _LVOOpenLibrary(a6) tst.l d0 bne.s ldCont rts ldCont: move.l d0,a6 jsr _LVOstcLibDeCrunchPExec(a6) ldH1End: ; Crunched data starts here. Jsr passes address of the data ; into the stack.. ; ; Library function takes care of closing library.. INPUTS hunk1 = pointer to next hunk in seglist seglist = pointer to program's segment list NOTE You really _must_ know what you are going to do because this function causes easily those red boxes. There can't more than two hunks in command file that includes this function and the example above is the only way how to use function correctly. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/CrunchDataTags NAME CrunchDataTags -- crunch data in buffer SYNOPSIS crunchedlength = CrunchDataTags( taglist ) D0 -96 A0 ULONG CrunchDataTags( struct TagItem * ); FUNCTION Crunches data in buffer with the latest algorithm or actually with the algorithm you defined with AllocBuffer() (both S403 and S404 algorithms default to S404). There are following tags for CrunchDataTags(): cdDESTINATION - you must give filebuffer as a destination. See AllocFileBuffer(), NewAllocFileBuffer(), AllocMemBuffer() and LoadFileBuffer(). cdLENGTH - size of file to be crunched. cdABORTFLAGS - there are three possibilities and only one of them can be used at once. If cdABORTFLAGS == cdAbortNIL there's no way to abort crunching process. If cdABORTFLAGS == cdAbortGADGET function expects to find valid pointer to a message structure in cdMSGPORT tag. This message port is checked every now and then if a gadget event has arrived. Note! The "abort gadget's" user data field must be NULL. If your message port gets gadget events from several gadgets take care that only "abort gadget's" user data field is NULL. If cdABORTFLAGS == cdAbortCTRLC ctrl-c signal is checked. This works only when your program is running under CLI without own window. cdOUTPUTFLAGS - there are three possibilities and only one of them can be used at once. If cdOUTPUTFLAGS == cdOutPutNIL then no output is done. If cdABORTFLAGS == cdOutPutWIN function expects to find valid pointer to your window's rastport in cdRASTPORT tag. Number of bytes still remaining is written into your window. Position must be defines with cdXPOS & cdYPOS tags. If cdOutPutFLAGS == cdOutPutCLI function expects to find file handle (use DOS Output() ) in cdRASTPORT tag. The counter is written into CLI. cdXPOS - define relative x position for crunch counter in your window. You need this tag only when cdOUTPUTFLAGS == cdOutPutWIN. cdYPOS - define relative y position for crunch counter in your window. You need this tag only when cdOUTPUTFLAGS == cdOutPutWIN. cdRASTPORT - pointer to your window's raster port. You need this tag only when cdOUTPUTFLAGS == cdOutPutWIN. If cdOUTPUTFLAGS == cdOutPutCLI this tag must be CLI's file handle (use DOS Output() ). cdMSGPORT - pointer to your window's message port. This tag is used and needed only when cdABORTFLAGS == cdAbortGADGET. cdDISTBITS - define cruncher's efficiency. There are five possibilities: cdDist1K = the worst efficiency but the fastest cdDist2K = . cdDist4K = . cdDist8K = . cdDist16K = the best efficiency but the slowest cdBUFFER - pointer to buffer you have allocated with AllocBuffer(). INPUTS taglist = pointer to your taglist (an array of longwords). The taglist must end with TAG_DONE. RESULT crunchedlength = new crunched length (includes 16 bytes of decrunch info header), NULL if crunching failed or -1L if user aborted crunching. (this value is always longword aligned) SEE ALSO DeCrunchData(), LoadFileBuffer(), AllocFileBuffer(), NewAllocFileBuffer(), AllocMemBuffer() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/SaveExecTags NAME SaveExecTags -- saves crunched file with decruncher SYNOPSIS savedlength = SaveExecTags( taglist ) D0 -102 A0 ULONG SaveExecTags( struct TagItem *taglist ); FUNCTION Saves crunched file with wanted decruncher or without decruncher. There are following tags for SaveExecTags(): sxSAVETYPE - define what kind of decruncher you want to attach to the crunched file. Stc.library v3.303 & v3.304 have six types: sxData = no decruncher, just crunched data sxPExec = normal decruncher for command files. All needed hunks, memory handling and relocation is included. Average speed. sxPExecLib = same as above but needs stc.library for decrunching. Fast & short decruncher! sxAbsNormal = normal decruncher for absolute files. One hunk and cache code. Average speed. sxAbsPlain = decruncher included but without hunks so it's not runable from CLI or workbench. No cache code. Average speed. sxAbsKillSystem = special decruncher for absolute files. One hunk, cache code, stack relocation, forces VBR (=vector base register) to zero and SR (=status register) is modified. Use only if you need to overdrive OS. Average speed. NOTE! Kill system decruncher returns processor type in A4 register. If A4 = $00000000 mc68000/010 is presented and if A4 = $ffffffff mc68020/030/040 is presented! sxFILENAME - pointer NULL terminated filename. sxDATABUFFER - pointer to filebuffer that was allocated with AllocFileBuffer() or NewAllocFileBuffer(). sxLENGTH - size of crunched file. CrunchDataTags() returns this value. sxLOAD - start address of absolute file. You need this with all absolute files. sxJUMP - run address of absolute file. You need this with all absolute files. sxDECR - memory location for decruncher code. You need this when sxSAVETYPE == sxAbsKillSystem. sxUSP - new memory location for user stackpointer. You need this when sxSAVETYPE == sxAbsKillSystem. sxSSP - new memory location for system stackpointer (=interrupt stackppointer). You need this when sxSAVETYPE == sxAbsKillSystem. sxSR - define status register. The value is loaded into SR just before running your code so flags won't change during decrunching. You need this when sxSAVETYPE == sxAbsKillSystem. INPUTS taglist = pointer to your taglist (an array of longwords). The taglist must end with TAG_DONE. RESULT savedlength = total bytes saved to the disk or NULL if an error occured. Read ErrorMsg for DOS errorcode. BUGS Read also the note considering StcBase->ErrorMsg in include/libraries/stc.h. SEE ALSO CrunchDataTags() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/NewAllocFileBuffer NAME NewAllocFileBuffer -- allocate memory for file SYNOPSIS filebuffer = NewAllocFileBUffer( securitylength, filename ) D0 -108 D0 A0 APTR NewAllocFileBuffer( ULONG securitylength, char *filename ); FUNCTION Allocates memory for file to be crunched. This is the only way to do it in future compatible way. Security length must be even value (prefer longword alignment). INPUTS securitylength = how many bytes source data and crunched data can overlap each other without confusing crunching or decrunching. filename = pointer to NULL terminated filename. In maximum 108 characters (including path if added). RESULT filebuffer = pointer to filebuffer that is used with many other functions or NULL if an error occured. In case of error if: ErrorMsg = NULL then there wasn't enough memory, ErrorMsg <> NULL it's the DOS errorcode. BUGS Read also the note considering StcBase->ErrorMsg in include/libraries/stc.h. SEE ALSO DeCrunchData(), LoadFileBuffer(), CrunchDataTags(), SaveExecTags() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/AllocMemBuffer NAME AllocMemBuffer -- allocate memory for misc data SYNOPSIS filebuffer = AllocMemBuffer( securitylength, memsize ) D0 -114 D0 D1 APTR AllocMemBuffer( ULONG securitylength, ULONG memsize ); FUNCTION Allocates memory for "filebuffer" in future compatible way but you can't use LoadFileBuffer() with this filebuffer pointer. This function makes it possible to crunch anykind of data, not just files. You must take care of placing data into correct place in filebuffer yourself. The data (..you want to crunch) must start "security length" distance ahead from the start of the filebuffer! Like in this assembly example: myseclen equ 4 ; security length we use in this example move.l stcbase,a6 moveq #myseclen,d0 move.l #10240,d1 ; we want 10Kb buffer move.l d1,d2 jsr _LVOAllocMemBuffer(a6) move.l d0,filebuffer ; did we get memory beq nomemory lea mydata,a0 ; start of data we want to crunch move.l d0,a1 * a1 = filebuffer * addq #myseclen,a1 * add security length * lsr #2,d2 subq #1,d2 ; how many longwords to move loop: move.l (a0)+,(a1)+ ; zwing! dbra d2,loop . . * * And now we can go on crunching the contents of the filebuffer with * CrunchDataTags() and then save it with SaveExecTags(). And when we * don't need the buffer anymore it can be freed with FreeFileBuffer(). * INPUTS securitylength = how many bytes source data and crunched data can overlap each other without confusing crunching or decrunching. memsize = size of the filebuffer. RESULT filebuffer = pointer to filebuffer or NULL if no memory. SEE ALSO FreeFileBuffer(), CrunchDataTags(), SaveExecTags() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= stc.library/FileIs NAME FileIs -- examine file if it's already crunched SYNOPSIS fileinfo = FileIs( filename ) D0 -120 A0 ULONG FileIs( char *filename ); FUNCTION Examines file if it's already crunched with any of stc.library v2.0+ cruncher. This function finds and separates all decrunchers and cruncher types used in stc.library v2.0+. Returned fileinfo has a bit complicated layout. The fileinfo is divided into two parts. Bits 31-24 include info about the file and bits 23-0 include additional info (bytes to skip or DOS errorcode). IAAA.L = fileinfo ^^-^ | \| | | | +-----> AAA, bits 23-0, additional info | | +--> I = %aabbcccc, bits 31-24 bits 31-30 %aa = filetype: isEXEC %10 = exec (command file) isDATA %01 = data (can't be runned) %11 = reserved %00 = DOS error occured during examing! bits 29-28 %bb = cruncher type: %00 = not crunched isS403 %10 = S403 isS404 %01 = S404 %11 = reserved bits 27-24 %cccc = decruncher type: %0000 = not crunched? (sxData?) isNPEXEC %0001 = exec, normal decruncher (sxPExec) isLPEXEC %0010 = exec, library decruncher (sxPExecLib) isNABS %0011 = absolute normal (sxAbsNormal) isPABS %0100 = absolute plain (sxPlain) isKABS %0101 = absolute kill system (sxKillSystem) rest are reserved.. If %aa = %00 (DOS error occured during examing) AAA, bits 23-0, include DOS errorcode. Otherwise AAA, bits 23-0, include the number of bytes from the beginning of the file to the "decrunch info header" (=size of decruncher). Here are some examples of bitcombinations for different files (bits 31-24): aabbcccc crunched absolute plain (S404): %01010100 aabbcccc normal command file: %10000000 aabbcccc crunched libexecutable (S404): %10010010 INPUTS filename = pointer to NULL terminated filename. RESULT fileinfo = info about the file or DOS errorcode. SEE ALSO SaveExecTags(), DeCrunchData() =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= MOVEQ #0,D0 RTS ; succesful exit..