Tcl Source Code

    Tcl_Channel chan;		/* Reference to the channel itself. */
    Tcl_Channel parent;		/* The underlying source and sink of bytes. */
    int flags;			/* General flag bits, see below... */
    int mode;			/* Either the value TCL_ZLIB_STREAM_DEFLATE
				 * for compression on output, or
				 * TCL_ZLIB_STREAM_INFLATE for decompression
				 * on input. */
    int format;			/* What format of data is going on the wire.
				 * Needed so that the correct [fconfigure]
				 * options can be enabled. */
    z_stream inStream;		/* Structure used by zlib for decompression of
				 * input. */
    z_stream outStream;		/* Structure used by zlib for compression of
				 * output. */
    char *inBuffer, *outBuffer;	/* Working buffers. */
    int inAllocated, outAllocated;
				/* Sizes of working buffers. */

    Tcl_Obj *levelObj = NULL;
    const OptDescriptor compressionOpts[] = {
	{ "-dictionary", &compDictObj },
	{ "-level", &levelObj },
	{ NULL, NULL }
    };
    const OptDescriptor gzipOpts[] = {

	{ "-header", &gzipHeaderObj },
	{ "-level", &levelObj },
	{ NULL, NULL }
    };
    const OptDescriptor expansionOpts[] = {
	{ "-dictionary", &compDictObj },
	{ NULL, NULL }

	break;
    case FMT_GZIP:
	desc = gzipOpts;
	mode = TCL_ZLIB_STREAM_DEFLATE;
	format = TCL_ZLIB_FORMAT_GZIP;
	break;
    case FMT_GUNZIP:
	desc = expansionOpts; // FIXME - get header, not set compDict
	mode = TCL_ZLIB_STREAM_INFLATE;
	format = TCL_ZLIB_FORMAT_GZIP;
	break;
    default:
	Tcl_AppendResult(interp, "IMPOSSIBLE", NULL);
	return TCL_ERROR;
    }

	    break;
	case poDictionary:
	    if (++i > objc-1) {
		Tcl_AppendResult(interp,
			"value missing for -dictionary option", NULL);
		Tcl_SetErrorCode(interp, "TCL", "ZIP", "NOVAL", NULL);
		return TCL_ERROR;
	    }
	    if (format == TCL_ZLIB_FORMAT_GZIP) {
		Tcl_AppendResult(interp, "a compression dictionary may not "
			"be set in the gzip format", NULL);
		Tcl_SetErrorCode(interp, "TCL", "ZIP", "BADOPT", NULL);
		return TCL_ERROR;
	    }
	    compDictObj = objv[i];
	    break;
	}
    }

    if (ZlibStackChannelTransform(interp, mode, format, level, chan,

    const char *optionName,
    const char *value)
{
    ZlibChannelData *cd = instanceData;
    Tcl_DriverSetOptionProc *setOptionProc =
	    Tcl_ChannelSetOptionProc(Tcl_GetChannelType(cd->parent));
    static const char *chanOptions = "dictionary flush";
    static const char *gzipChanOptions = "flush";
    int haveFlushOpt = (cd->mode == TCL_ZLIB_STREAM_DEFLATE);

    if (optionName && (strcmp(optionName, "-dictionary") == 0)
	    && (cd->format != TCL_ZLIB_FORMAT_GZIP)) {
	Tcl_Obj *compDictObj;

	TclNewStringObj(compDictObj, value, strlen(value));
	Tcl_IncrRefCount(compDictObj);
	(void) Tcl_GetByteArrayFromObj(compDictObj, NULL);
	if (cd->compDictObj) {
	    TclDecrRefCount(cd->compDictObj);

		return TCL_ERROR;
	    }
	}
	return TCL_OK;
    }

    if (setOptionProc == NULL) {
	if (cd->format == TCL_ZLIB_FORMAT_GZIP) {
	    return Tcl_BadChannelOption(interp, optionName, gzipChanOptions);
	} else {
	    return Tcl_BadChannelOption(interp, optionName, chanOptions);
	}
    }

    return setOptionProc(Tcl_GetChannelInstanceData(cd->parent), interp,
	    optionName, value);
}

static int

	    Tcl_DStringAppendElement(dsPtr, buf);
	} else {
	    Tcl_DStringAppend(dsPtr, buf, -1);
	    return TCL_OK;
	}
    }

    if ((cd->format != TCL_ZLIB_FORMAT_GZIP) &&
	    (optionName == NULL || strcmp(optionName, "-dictionary") == 0)) {
	/*
	 * Embedded NUL bytes are ok; they'll be C080-encoded.
	 */

	if (optionName == NULL) {
	    Tcl_DStringAppendElement(dsPtr, "-dictionary");
	    if (cd->compDictObj) {

    if (mode != TCL_ZLIB_STREAM_DEFLATE && mode != TCL_ZLIB_STREAM_INFLATE) {
	Tcl_Panic("unknown mode: %d", mode);
    }

    memset(cd, 0, sizeof(ZlibChannelData));
    cd->mode = mode;
    cd->format = format;

    if (format == TCL_ZLIB_FORMAT_GZIP || format == TCL_ZLIB_FORMAT_AUTO) {
	if (mode == TCL_ZLIB_STREAM_DEFLATE) {
	    if (gzipHeaderDictPtr) {
		cd->flags |= OUT_HEADER;
		if (GenerateHeader(interp, gzipHeaderDictPtr, &cd->outHeader,
			NULL) != TCL_OK) {

    puts $fd "qwertyuiop"
    fconfigure $fd -flush sync
    puts $fd "qwertyuiop"
} -cleanup {
    catch {close $fd}
    removeFile $file
} -result {}
test zlib-8.5 {transformation and fconfigure} -setup {
    set file [makeFile {} test.z]
    set fd [open $file wb]
} -constraints zlib -body {
    list [fconfigure $fd] [zlib push compress $fd; fconfigure $fd] \
	[chan pop $fd; fconfigure $fd]
} -cleanup {
    catch {close $fd}
    removeFile $file
} -result {{-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf -checksum 1 -dictionary {}} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf}}
test zlib-8.6 {transformation and fconfigure} -setup {
    set file [makeFile {} test.gz]
    set fd [open $file wb]
} -constraints zlib -body {
    list [fconfigure $fd] [zlib push gzip $fd; fconfigure $fd] \
	[chan pop $fd; fconfigure $fd]
} -cleanup {
    catch {close $fd}
    removeFile $file
} -result {{-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf -checksum 0} {-blocking 1 -buffering full -buffersize 4096 -encoding binary -eofchar {} -translation lf}}

test zlib-9.1 "check fcopy with push" -constraints zlib -setup {
    set sfile [makeFile {} testsrc.gz]
    set file [makeFile {} test.gz]
    set f [open $sfile wb]
    puts -nonewline $f [zlib gzip [string repeat a 81920]]
    close $f