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ExampleClient.c
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C/C++ Source or Header
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1999-08-09
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173 lines
#ifndef XADMASTER_EXAMPLE_C
#define XADMASTER_EXAMPLE_C
/* Programmheader
Name: Example.c
Main: xadmaster
Versionstring: $VER: Example.c 1.2 (29.06.1999)
Author: SDI
Distribution: Freeware
Description: Example disk or file archiver client
1.0 16.02.99 : first version
1.1 20.06.99 : some little corrections
1.2 29.06.99 : now uses master free stuff
*/
#include <proto/xadmaster.h>
#include <dos/dos.h>
#include "SDI_compiler.h"
#ifndef XADMASTERFILE
#define Example_Client FirstClient
#define NEXTCLIENT 0
UBYTE version[] = "$VER: Example 1.2 (29.06.1999)";
#endif
#define EXAMPLE_VERSION 1
#define EXAMPLE_REVISION 2
/* This is an empty example client! You should replace all "EXAMPLE"
texts with text related to your own client. */
/* NOTE: I normally use SAS-C. This compiler supports local base variables
for library calls, so all function calls to xadmaster.library can be done
using the argument passed in register A6.
If your compiler does not support that, insert a global base, rename the
argument of the functions to lower case xadmasterbase and add following
line in Example_GetInfo() function:
xadMasterBase = xadmasterbase;
xadMasterBase also has a pointer to DOSBase and SysBase, but normally this
should not be necessary, but it is useful for debug output in test versions.
*/
/* See the included example clients as well! */
ASM(BOOL) Example_RecogData(REG(d0, ULONG size), REG(a0, STRPTR data),
REG(a6, struct xadMasterBase *xadMasterBase))
{
if(/* do some checks here (headerID, header checksum, ...) */)
return 1; /* known file */
else
return 0; /* unknown file */
}
ASM(LONG) Example_GetInfo(REG(a0, struct xadArchiveInfo *ai),
REG(a6, struct xadMasterBase *xadMasterBase))
{
/* return an error code, as long as function is empty */
return XADERR_NOTSUPPORTED;
/* Always do this function first (after RecogData). Normally it's the
easiest one.
General style for file archivers:
-Allocate "xadAllocObject(XADOBJ_FILEINFO, ...., TAG_DONE)" the
xadFileInfo structure for every file and fill it's fields with
correct values (date, size, protection, crunched size, flags, ...).
-Add the allocated structure to a linked list, which is assigned to
ai->xai_FileInfo.
-If an error occurs set "ai->xai_Flags & XADAIF_FILECORRUPT" or
return the error if it is really serious. If there are already valid
entries in linked list, there cannot be that serious!
-Leave this function.
General style for disk archivers:
-Allocate "xadAllocObject(XADOBJ_DISKINFO, ...., TAG_DONE)" the
xadDiskInfo structure for every file and fill it's fields with
correct values (tracks, heads, flags, ...).
-Add the allocated structure to a linked list, which is assigned to
ai->xai_DiskInfo.
-If there are information texts, create a linked list with xadTextInfo
structures. These are allocated with xadAllocObjectA(XADOBJ_TEXTINFO, 0).
-If an error occurs set "ai->xai_Flags & XADAIF_FILECORRUPT" or
return the error if it is really serious. If there are already valid
entries in linked list, there cannot be that serious!
-Leave this function.
For nearly all archivers it is necessary to store current file position
(ai->xai_InPos), to be able to find the data in unarchive function.
Get data using "xadHookAccess(XADAC_READ, size, buf, ai)" and seek input
data using "xadHookAccess(XADAC_INPUTSEEK, size, 0, ai)".
*/
}
ASM(LONG) Example_UnArchive(REG(a0, struct xadArchiveInfo *ai),
REG(a6, struct xadMasterBase *xadMasterBase))
{
/* return an error code, as long as function is empty */
return XADERR_NOTSUPPORTED;
/*
-Either use ai->xai_CurDisk or ai->xai_CurFile and seek the input data
to the position required to access the archived data for the wanted entry:
"xadHookAccess(XADAC_INPUTSEEK, pos-ai->xai_InPos, 0, ai)".
-Extract the data using XADAC_READ for reads, XADAC_WRITE for storing data
or XADAC_COPY for copying the data directly.
- Leave the function either returning 0 or an errorcode, which occured.
*/
}
ASM(void) Example_Free(REG(a0, struct xadArchiveInfo *ai),
REG(a6, struct xadMasterBase *xadMasterBase))
{
/* This function needs to free all the stuff allocated in info or
unarchive function. It may be called multiple times, so clear freed
entries!
*/
/* The following example frees file and disk archive data. It assumes,
that disk archive information texts are allocated using xadAllocVec and all
the other stuff (file names, comments, ...) is allocated using the tags
of xadAllocObject function.
If you only do that stuff, then set the responding XADCF_FREE flags and
the master library does the stuff for you. In that case you do not even
need that function (remove it totally!).
In any other case you should modify that function to meet your special
requirements. Remember. The function should leave all fields cleared!
*/
struct xadFileInfo *fi, *fi2;
struct xadDiskInfo *di, *di2;
struct xadTextInfo *ti, *ti2;
for(fi = ai->xai_FileInfo; fi; fi = fi2)
{
fi2 = fi->xfi_Next;
xadFreeObjectA(fi, 0);
}
ai->xai_FileInfo = 0;
for(di = ai->xai_DiskInfo; di; di = di2)
{
di2 = di->xdi_Next;
for(ti = di->xdi_TextInfo; ti; ti = ti2)
{
ti2 = ti->xti_Next;
if(ti->xti_Text)
xadFreeObjectA(ti->xti_Text, 0);
xadFreeObjectA(ti, 0);
}
xadFreeObjectA(di, 0);
}
ai->xai_DiskInfo = 0;
}
/* You need to complete following structure! */
struct xadClient Example_Client = {
NEXTCLIENT, XADCLIENT_VERSION, 2, EXAMPLE_VERSION, EXAMPLE_REVISION,
/* Here the size the client really needs to detect the filetype must be
inserted */, /* XADCF_DISKARCHIVER and/or XADCF_FILEARCHIVER and some of
XADCF_FREEDISKINFO|XADCF_FREEFILEINFO|XADCF_FREETEXTINFO|XADCF_FREETEXTINFOTEXT */,
0 /* Type identifier. Normally should be zero */, "Example",
(BOOL (*)()) Example_RecogData, (LONG (*)()) Example_GetInfo,
(LONG (*)()) Example_UnArchive, /* 0 or (void (*)()) Example_Free */};
#endif /* XADASTER_EXAMPLE_C */