#include <assert.h>

/*
 * The following constants are used by GetFormatSpec to indicate various
 * special conditions in the parsing of a format specifier.
 */

#define BINARY_ALL -1		/* Use all elements in the argument. */
#define BINARY_NOCOUNT -2	/* No count was specified in format. */

/*
 * The following flags may be ORed together and returned by GetFormatSpec
 */

#define BINARY_SIGNED 0		/* Field to be read as signed data */
#define BINARY_UNSIGNED 1	/* Field to be read as unsigned data */

/*
 * Prototypes for local procedures defined in this file:
 */

static void		DupByteArrayInternalRep(Tcl_Obj *srcPtr,
			    Tcl_Obj *copyPtr);
static void		DupProperByteArrayInternalRep(Tcl_Obj *srcPtr,
			    Tcl_Obj *copyPtr);
static int		FormatNumber(Tcl_Interp *interp, int type,
			    Tcl_Obj *src, unsigned char **cursorPtr);
static void		FreeByteArrayInternalRep(Tcl_Obj *objPtr);
static void		FreeProperByteArrayInternalRep(Tcl_Obj *objPtr);
static int		GetFormatSpec(const char **formatPtr, char *cmdPtr,
			    int *countPtr, int *flagsPtr);
static Tcl_Obj *	ScanNumber(unsigned char *buffer, int type,
			    int flags, Tcl_HashTable **numberCachePtr);
static int		SetByteArrayFromAny(Tcl_Interp *interp,
			    Tcl_Obj *objPtr);
static void		UpdateStringOfByteArray(Tcl_Obj *listPtr);
static void		DeleteScanNumberCache(Tcl_HashTable *numberCachePtr);
static int		NeedReversing(int format);
static void		CopyNumber(const void *from, void *to,
			    unsigned length, int type);
/* Binary ensemble commands */
static int		BinaryFormatCmd(ClientData clientData,
			    Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);
static int		BinaryScanCmd(ClientData clientData,
			    Tcl_Interp *interp,
			    int objc, Tcl_Obj *const objv[]);

 * been retrofitted with the required "purity testing".  The set of values
 * able to pass the purity test can be increased via the introduction of
 * a "canonical" flag marker, but the only way the broken interface itself
 * can be discarded is to start over and define the Tcl_ObjType properly.
 * Bytearrays should simply be usable as bytearrays without a kabuki
 * dance of testing.
 *
 * The Tcl_ObjType "properByteArrayType" is (nearly) a correct
 * implementation of bytearrays.  Any Tcl value with the type
 * properByteArrayType can have its bytearray value fetched and
 * used with confidence that acting on that value is equivalent to
 * acting on the true Tcl string value.  This still implies a side
 * testing burden -- past mistakes will not let us avoid that
 * immediately, but it is at least a conventional test of type, and
 * can be implemented entirely by examining the objPtr fields, with

 * so that Tcl 9 will no longer have any trace of it.  Prescribing a
 * migration path will be the key element of that work.  The internal
 * changes now in place are the limit of what can be done short of
 * interface repair.  They provide a great expansion of the histories
 * over which bytearray values can be useful in the meanwhile.
 */

static const Tcl_ObjType properByteArrayType = {
    "bytearray",
    FreeProperByteArrayInternalRep,
    DupProperByteArrayInternalRep,
    UpdateStringOfByteArray,
    NULL
};

const Tcl_ObjType tclByteArrayType = {
    "bytearray",
    FreeByteArrayInternalRep,

				 * above. */
} ByteArray;

#define BYTEARRAY_SIZE(len) \
		((TclOffset(ByteArray, bytes) + (len)))
#define GET_BYTEARRAY(irPtr) ((ByteArray *) (irPtr)->twoPtrValue.ptr1)
#define SET_BYTEARRAY(irPtr, baPtr) \
		(irPtr)->twoPtrValue.ptr1 = (void *) (baPtr)

int
TclIsPureByteArray(
    Tcl_Obj * objPtr)
{
    return (NULL != Tcl_FetchIntRep(objPtr, &properByteArrayType));
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_NewByteArrayObj --
 *
 *	This procedure is creates a new ByteArray object and initializes it

    byteArrayPtr->allocated = length;

    if ((bytes != NULL) && (length > 0)) {
	memcpy(byteArrayPtr->bytes, bytes, length);
    }
    SET_BYTEARRAY(&ir, byteArrayPtr);

    Tcl_StoreIntRep(objPtr, &properByteArrayType, &ir);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_GetByteArrayFromObj --
 *

unsigned char *
Tcl_GetByteArrayFromObj(
    Tcl_Obj *objPtr,		/* The ByteArray object. */
    int *lengthPtr)		/* If non-NULL, filled with length of the
				 * array of bytes in the ByteArray object. */
{
    ByteArray *baPtr;
    const Tcl_ObjIntRep *irPtr = Tcl_FetchIntRep(objPtr, &properByteArrayType);

    if (irPtr == NULL) {
	irPtr = Tcl_FetchIntRep(objPtr, &tclByteArrayType);
	if (irPtr == NULL) {
	    SetByteArrayFromAny(NULL, objPtr);
	    irPtr = Tcl_FetchIntRep(objPtr, &properByteArrayType);
	    if (irPtr == NULL) {
		irPtr = Tcl_FetchIntRep(objPtr, &tclByteArrayType);
	    }
	}
    }
    baPtr = GET_BYTEARRAY(irPtr);

    if (lengthPtr != NULL) {
	*lengthPtr = baPtr->used;

    ByteArray *byteArrayPtr;
    Tcl_ObjIntRep *irPtr;

    if (Tcl_IsShared(objPtr)) {
	Tcl_Panic("%s called with shared object", "Tcl_SetByteArrayLength");
    }

    irPtr = Tcl_FetchIntRep(objPtr, &properByteArrayType);
    if (irPtr == NULL) {
	irPtr = Tcl_FetchIntRep(objPtr, &tclByteArrayType);
	if (irPtr == NULL) {
	    SetByteArrayFromAny(NULL, objPtr);
	    irPtr = Tcl_FetchIntRep(objPtr, &properByteArrayType);
	    if (irPtr == NULL) {
		irPtr = Tcl_FetchIntRep(objPtr, &tclByteArrayType);
	    }
	}
    }

    byteArrayPtr = GET_BYTEARRAY(irPtr);
    if (length > byteArrayPtr->allocated) {
	byteArrayPtr = Tcl_Realloc(byteArrayPtr, BYTEARRAY_SIZE(length));

    size_t length;
    int improper = 0;
    const char *src, *srcEnd;
    unsigned char *dst;
    ByteArray *byteArrayPtr;
    Tcl_ObjIntRep ir;

    if (Tcl_FetchIntRep(objPtr, &properByteArrayType)) {
	return TCL_OK;
    }
    if (Tcl_FetchIntRep(objPtr, &tclByteArrayType)) {
	return TCL_OK;
    }

    src = TclGetString(objPtr);
    length = objPtr->length;
    srcEnd = src + length;

    byteArrayPtr = Tcl_Alloc(BYTEARRAY_SIZE(length));
    for (dst = byteArrayPtr->bytes; src < srcEnd; ) {
	Tcl_UniChar ch = 0;
	src += TclUtfToUniChar(src, &ch);
	improper = improper || (ch > 255);
	*dst++ = UCHAR(ch);
    }

    byteArrayPtr->used = dst - byteArrayPtr->bytes;
    byteArrayPtr->allocated = length;

    SET_BYTEARRAY(&ir, byteArrayPtr);
    Tcl_StoreIntRep(objPtr,
	    improper ? &tclByteArrayType : &properByteArrayType, &ir);
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * FreeByteArrayInternalRep --

 *----------------------------------------------------------------------
 */

static void
FreeByteArrayInternalRep(
    Tcl_Obj *objPtr)		/* Object with internal rep to free. */
{
    Tcl_Free(GET_BYTEARRAY(Tcl_FetchIntRep(objPtr, &tclByteArrayType)));
}

static void
FreeProperByteArrayInternalRep(
    Tcl_Obj *objPtr)		/* Object with internal rep to free. */
{
    Tcl_Free(GET_BYTEARRAY(Tcl_FetchIntRep(objPtr, &properByteArrayType)));
}

/*
 *----------------------------------------------------------------------
 *
 * DupByteArrayInternalRep --
 *

    Tcl_Obj *srcPtr,		/* Object with internal rep to copy. */
    Tcl_Obj *copyPtr)		/* Object with internal rep to set. */
{
    size_t length;
    ByteArray *srcArrayPtr, *copyArrayPtr;
    Tcl_ObjIntRep ir;

    srcArrayPtr = GET_BYTEARRAY(Tcl_FetchIntRep(srcPtr, &tclByteArrayType));
    length = srcArrayPtr->used;

    copyArrayPtr = Tcl_Alloc(BYTEARRAY_SIZE(length));
    copyArrayPtr->used = length;
    copyArrayPtr->allocated = length;
    memcpy(copyArrayPtr->bytes, srcArrayPtr->bytes, length);

    SET_BYTEARRAY(&ir, copyArrayPtr);
    Tcl_StoreIntRep(copyPtr, &tclByteArrayType, &ir);
}

static void
DupProperByteArrayInternalRep(
    Tcl_Obj *srcPtr,		/* Object with internal rep to copy. */
    Tcl_Obj *copyPtr)		/* Object with internal rep to set. */
{
    size_t length;
    ByteArray *srcArrayPtr, *copyArrayPtr;
    Tcl_ObjIntRep ir;

    srcArrayPtr = GET_BYTEARRAY(Tcl_FetchIntRep(srcPtr, &properByteArrayType));
    length = srcArrayPtr->used;

    copyArrayPtr = Tcl_Alloc(BYTEARRAY_SIZE(length));
    copyArrayPtr->used = length;
    copyArrayPtr->allocated = length;
    memcpy(copyArrayPtr->bytes, srcArrayPtr->bytes, length);

    SET_BYTEARRAY(&ir, copyArrayPtr);
    Tcl_StoreIntRep(copyPtr, &properByteArrayType, &ir);
}

/*
 *----------------------------------------------------------------------
 *
 * UpdateStringOfByteArray --
 *

 */

static void
UpdateStringOfByteArray(
    Tcl_Obj *objPtr)		/* ByteArray object whose string rep to
				 * update. */
{
    const Tcl_ObjIntRep *irPtr = Tcl_FetchIntRep(objPtr, &properByteArrayType);
    ByteArray *byteArrayPtr = GET_BYTEARRAY(irPtr);
    unsigned char *src = byteArrayPtr->bytes;
    size_t i, length = byteArrayPtr->used;
    size_t size = length;

    /*
     * How much space will string rep need?

		"TclAppendBytesToByteArray");
    }
    if (len == 0) {
	/* Append zero bytes is a no-op. */
	return;
    }

    irPtr = Tcl_FetchIntRep(objPtr, &properByteArrayType);
    if (irPtr == NULL) {
	irPtr = Tcl_FetchIntRep(objPtr, &tclByteArrayType);
	if (irPtr == NULL) {
	    SetByteArrayFromAny(NULL, objPtr);
	    irPtr = Tcl_FetchIntRep(objPtr, &properByteArrayType);
	    if (irPtr == NULL) {
		irPtr = Tcl_FetchIntRep(objPtr, &tclByteArrayType);
	    }
	}
    }
    byteArrayPtr = GET_BYTEARRAY(irPtr);

    if (len > UINT_MAX - byteArrayPtr->used) {
	Tcl_Panic("max size for a Tcl value (%u bytes) exceeded", UINT_MAX);

    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    int arg;			/* Index of next argument to consume. */
    int value = 0;		/* Current integer value to be packed.
				 * Initialized to avoid compiler warning. */
    char cmd;			/* Current format character. */
    int count;			/* Count associated with current format
				 * character. */
    int flags;			/* Format field flags */
    const char *format;	/* Pointer to current position in format
				 * string. */
    Tcl_Obj *resultPtr = NULL;	/* Object holding result buffer. */
    unsigned char *buffer;	/* Start of result buffer. */
    unsigned char *cursor;	/* Current position within result buffer. */
    unsigned char *maxPos;	/* Greatest position within result buffer that
				 * cursor has visited.*/
    const char *errorString;
    const char *errorValue, *str;
    int offset, size, length;


    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "formatString ?arg ...?");
	return TCL_ERROR;
    }

    /*

	     * of bytes in a single argument.
	     */

	    if (arg >= objc) {
		goto badIndex;
	    }
	    if (count == BINARY_ALL) {
		TclGetByteArrayFromObj(objv[arg], &count);
	    } else if (count == BINARY_NOCOUNT) {
		count = 1;
	    }
	    arg++;
	    if (cmd == 'a' || cmd == 'A') {
		offset += count;
	    } else if (cmd == 'b' || cmd == 'B') {

			&listv) != TCL_OK) {
		    return TCL_ERROR;
		}
		arg++;

		if (count == BINARY_ALL) {
		    count = listc;
		} else if (count > listc) {
		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
			    "number of elements in list does not match count",
			    -1));
		    return TCL_ERROR;
		}
	    }
	    offset += count*size;

	    }
	    offset += count;
	    break;
	case 'X':
	    if (count == BINARY_NOCOUNT) {
		count = 1;
	    }
	    if ((count > offset) || (count == BINARY_ALL)) {
		count = offset;
	    }
	    if (offset > length) {
		length = offset;
	    }
	    offset -= count;
	    break;
	case '@':
	    if (offset > length) {
		length = offset;
	    }
	    if (count == BINARY_ALL) {
		offset = length;
	    } else if (count == BINARY_NOCOUNT) {
		goto badCount;
	    } else {
		offset = count;
	    }
	    break;
	default:
	    errorString = str;
	    goto badField;
	}
    }
    if (offset > length) {
	length = offset;
    }
    if (length == 0) {
	return TCL_OK;
    }

    /*
     * Prepare the result object by preallocating the caclulated number of
     * bytes and filling with nulls.
     */

    resultPtr = Tcl_NewObj();
    buffer = Tcl_SetByteArrayLength(resultPtr, length);
    memset(buffer, 0, (size_t) length);

    /*
     * Pack the data into the result object. Note that we can skip the
     * error checking during this pass, since we have already parsed the
     * string once.
     */

	    arg++;
	    if (count == BINARY_ALL) {
		count = length;
	    } else if (count == BINARY_NOCOUNT) {
		count = 1;
	    }
	    if (length >= count) {
		memcpy(cursor, bytes, (size_t) count);
	    } else {
		memcpy(cursor, bytes, (size_t) length);
		memset(cursor + length, pad, (size_t) (count - length));
	    }
	    cursor += count;
	    break;
	}
	case 'b':
	case 'B': {
	    unsigned char *last;

	    str = Tcl_GetStringFromObj(objv[arg], &length);
	    arg++;
	    if (count == BINARY_ALL) {
		count = length;
	    } else if (count == BINARY_NOCOUNT) {
		count = 1;
	    }
	    last = cursor + ((count + 7) / 8);
	    if (count > length) {
		count = length;
	    }
	    value = 0;
	    errorString = "binary";
	    if (cmd == 'B') {
		for (offset = 0; offset < count; offset++) {
		    value <<= 1;
		    if (str[offset] == '1') {
			value |= 1;
		    } else if (str[offset] != '0') {
			errorValue = str;
			Tcl_DecrRefCount(resultPtr);
			goto badValue;
		    }
		    if (((offset + 1) % 8) == 0) {
			*cursor++ = UCHAR(value);
			value = 0;
		    }
		}
	    } else {
		for (offset = 0; offset < count; offset++) {
		    value >>= 1;
		    if (str[offset] == '1') {
			value |= 128;
		    } else if (str[offset] != '0') {
			errorValue = str;
			Tcl_DecrRefCount(resultPtr);
			goto badValue;

	    break;
	}
	case 'h':
	case 'H': {
	    unsigned char *last;
	    int c;

	    str = Tcl_GetStringFromObj(objv[arg], &length);
	    arg++;
	    if (count == BINARY_ALL) {
		count = length;
	    } else if (count == BINARY_NOCOUNT) {
		count = 1;
	    }
	    last = cursor + ((count + 1) / 2);
	    if (count > length) {
		count = length;
	    }
	    value = 0;
	    errorString = "hexadecimal";
	    if (cmd == 'H') {
		for (offset = 0; offset < count; offset++) {
		    value <<= 4;
		    if (!isxdigit(UCHAR(str[offset]))) {     /* INTL: digit */
			errorValue = str;
			Tcl_DecrRefCount(resultPtr);
			goto badValue;
		    }
		    c = str[offset] - '0';
		    if (c > 9) {
			c += ('0' - 'A') + 10;
		    }
		    if (c > 16) {
			c += ('A' - 'a');
		    }
		    value |= (c & 0xf);
		    if (offset % 2) {
			*cursor++ = (char) value;
			value = 0;
		    }
		}
	    } else {
		for (offset = 0; offset < count; offset++) {
		    value >>= 4;

		    if (!isxdigit(UCHAR(str[offset]))) {     /* INTL: digit */
			errorValue = str;
			Tcl_DecrRefCount(resultPtr);
			goto badValue;
		    }

	    } else {
		TclListObjGetElements(interp, objv[arg], &listc, &listv);
		if (count == BINARY_ALL) {
		    count = listc;
		}
	    }
	    arg++;
	    for (i = 0; i < count; i++) {
		if (FormatNumber(interp, cmd, listv[i], &cursor)!=TCL_OK) {
		    Tcl_DecrRefCount(resultPtr);
		    return TCL_ERROR;
		}
	    }
	    break;
	}
	case 'x':
	    if (count == BINARY_NOCOUNT) {
		count = 1;
	    }
	    memset(cursor, 0, (size_t) count);
	    cursor += count;
	    break;
	case 'X':
	    if (cursor > maxPos) {
		maxPos = cursor;
	    }
	    if (count == BINARY_NOCOUNT) {
		count = 1;
	    }
	    if ((count == BINARY_ALL) || (count > (cursor - buffer))) {
		cursor = buffer;
	    } else {
		cursor -= count;
	    }
	    break;
	case '@':
	    if (cursor > maxPos) {

    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    int arg;			/* Index of next argument to consume. */
    int value = 0;		/* Current integer value to be packed.
				 * Initialized to avoid compiler warning. */
    char cmd;			/* Current format character. */
    int count;			/* Count associated with current format
				 * character. */
    int flags;			/* Format field flags */
    const char *format;	/* Pointer to current position in format
				 * string. */
    Tcl_Obj *resultPtr = NULL;	/* Object holding result buffer. */
    unsigned char *buffer;	/* Start of result buffer. */
    const char *errorString;
    const char *str;
    int offset, size, length;


    int i;
    Tcl_Obj *valuePtr, *elementPtr;
    Tcl_HashTable numberCacheHash;
    Tcl_HashTable *numberCachePtr;

    if (objc < 3) {

	    }
	    if (count == BINARY_ALL) {
		count = length - offset;
	    } else {
		if (count == BINARY_NOCOUNT) {
		    count = 1;
		}
		if (count > (length - offset)) {
		    goto done;
		}
	    }

	    src = buffer + offset;
	    size = count;

	    }
	    if (count == BINARY_ALL) {
		count = (length - offset) * 8;
	    } else {
		if (count == BINARY_NOCOUNT) {
		    count = 1;
		}
		if (count > (length - offset) * 8) {
		    goto done;
		}
	    }
	    src = buffer + offset;
	    valuePtr = Tcl_NewObj();
	    Tcl_SetObjLength(valuePtr, count);
	    dest = TclGetString(valuePtr);

	    if (cmd == 'b') {
		for (i = 0; i < count; i++) {
		    if (i % 8) {
			value >>= 1;
		    } else {
			value = *src++;
		    }
		    *dest++ = (char) ((value & 1) ? '1' : '0');
		}
	    } else {
		for (i = 0; i < count; i++) {
		    if (i % 8) {
			value <<= 1;
		    } else {
			value = *src++;
		    }
		    *dest++ = (char) ((value & 0x80) ? '1' : '0');
		}

	    }
	    src = buffer + offset;
	    valuePtr = Tcl_NewObj();
	    Tcl_SetObjLength(valuePtr, count);
	    dest = TclGetString(valuePtr);

	    if (cmd == 'h') {
		for (i = 0; i < count; i++) {
		    if (i % 2) {
			value >>= 4;
		    } else {
			value = *src++;
		    }
		    *dest++ = hexdigit[value & 0xf];
		}
	    } else {
		for (i = 0; i < count; i++) {
		    if (i % 2) {
			value <<= 4;
		    } else {
			value = *src++;
		    }
		    *dest++ = hexdigit[(value >> 4) & 0xf];
		}

	scanNumber:
	    if (arg >= objc) {
		DeleteScanNumberCache(numberCachePtr);
		goto badIndex;
	    }
	    if (count == BINARY_NOCOUNT) {
		if ((length - offset) < size) {
		    goto done;
		}
		valuePtr = ScanNumber(buffer+offset, cmd, flags,
			&numberCachePtr);
		offset += size;
	    } else {
		if (count == BINARY_ALL) {
		    count = (length - offset) / size;
		}
		if ((length - offset) < (count * size)) {
		    goto done;
		}
		valuePtr = Tcl_NewObj();
		src = buffer + offset;
		for (i = 0; i < count; i++) {
		    elementPtr = ScanNumber(src, cmd, flags, &numberCachePtr);
		    src += size;
		    Tcl_ListObjAppendElement(NULL, valuePtr, elementPtr);
		}
		offset += count * size;
	    }

	    resultPtr = Tcl_ObjSetVar2(interp, objv[arg], NULL, valuePtr,
		    TCL_LEAVE_ERR_MSG);
	    arg++;
	    if (resultPtr == NULL) {
		DeleteScanNumberCache(numberCachePtr);
		return TCL_ERROR;
	    }
	    break;
	}
	case 'x':
	    if (count == BINARY_NOCOUNT) {
		count = 1;
	    }
	    if ((count == BINARY_ALL) || (count > (length - offset))) {
		offset = length;
	    } else {
		offset += count;
	    }
	    break;
	case 'X':
	    if (count == BINARY_NOCOUNT) {
		count = 1;
	    }
	    if ((count == BINARY_ALL) || (count > offset)) {
		offset = 0;
	    } else {
		offset -= count;
	    }
	    break;
	case '@':
	    if (count == BINARY_NOCOUNT) {

 *----------------------------------------------------------------------
 */

static int
GetFormatSpec(
    const char **formatPtr,	/* Pointer to format string. */
    char *cmdPtr,		/* Pointer to location of command char. */
    int *countPtr,		/* Pointer to repeat count value. */
    int *flagsPtr)		/* Pointer to field flags */
{
    /*
     * Skip any leading blanks.
     */

    while (**formatPtr == ' ') {

 *----------------------------------------------------------------------
 */

static void
CopyNumber(
    const void *from,		/* source */
    void *to,			/* destination */
    unsigned length,		/* Number of bytes to copy */
    int type)			/* What type of thing are we copying? */
{
    switch (NeedReversing(type)) {
    case 0:
	memcpy(to, from, length);
	break;
    case 1: {

	/*
	 * Double-precision floating point values. Tcl_GetDoubleFromObj
	 * returns TCL_ERROR for NaN, but we can check by comparing the
	 * object's type pointer.
	 */

	if (Tcl_GetDoubleFromObj(interp, src, &dvalue) != TCL_OK) {
	    const Tcl_ObjIntRep *irPtr = Tcl_FetchIntRep(src, &tclDoubleType);
	    if (irPtr == NULL) {
		return TCL_ERROR;
	    }
	    dvalue = irPtr->doubleValue;
	}
	CopyNumber(&dvalue, *cursorPtr, sizeof(double), type);
	*cursorPtr += sizeof(double);
	return TCL_OK;

    case 'f':
    case 'r':
    case 'R':
	/*
	 * Single-precision floating point values. Tcl_GetDoubleFromObj
	 * returns TCL_ERROR for NaN, but we can check by comparing the
	 * object's type pointer.
	 */

	if (Tcl_GetDoubleFromObj(interp, src, &dvalue) != TCL_OK) {
	    const Tcl_ObjIntRep *irPtr = Tcl_FetchIntRep(src, &tclDoubleType);
	    if (irPtr == NULL) {
		return TCL_ERROR;
	    }
	    dvalue = irPtr->doubleValue;
	}

	/*

    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    Tcl_Obj *resultObj = NULL;
    unsigned char *data = NULL;
    unsigned char *cursor = NULL;
    int offset = 0, count = 0;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "data");
	return TCL_ERROR;
    }

    TclNewObj(resultObj);

    Tcl_Obj *const objv[])
{
    Tcl_Obj *resultObj;
    unsigned char *data, *cursor, *limit;
    int maxlen = 0;
    const char *wrapchar = "\n";
    size_t wrapcharlen = 1;
    int offset, i, index, size, outindex = 0, count = 0;

    enum {OPT_MAXLEN, OPT_WRAPCHAR };
    static const char *const optStrings[] = { "-maxlen", "-wrapchar", NULL };

    if (objc < 2 || objc%2 != 0) {
	Tcl_WrongNumArgs(interp, 1, objv,
		"?-maxlen len? ?-wrapchar char? data");
	return TCL_ERROR;

    ClientData clientData,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    Tcl_Obj *resultObj;
    unsigned char *data, *start, *cursor;
    int offset, count, rawLength, n, i, j, bits, index;
    int lineLength = 61;
    const unsigned char SingleNewline[] = { (unsigned char) '\n' };
    const unsigned char *wrapchar = SingleNewline;
    int wrapcharlen = sizeof(SingleNewline);
    enum { OPT_MAXLEN, OPT_WRAPCHAR };
    static const char *const optStrings[] = { "-maxlen", "-wrapchar", NULL };

    if (objc < 2 || objc%2 != 0) {
	Tcl_WrongNumArgs(interp, 1, objv,
		"?-maxlen len? ?-wrapchar char? data");
	return TCL_ERROR;