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-'\"
-'\" Copyright (c) 1997 Sun Microsystems, Inc.
-'\"
-'\" See the file "license.terms" for information on usage and redistribution
-'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
-'\"
-.TH Tcl_ByteArrayObj 3 8.1 Tcl "Tcl Library Procedures"
-.so man.macros
-.BS
-.SH NAME
-Tcl_NewByteArrayObj, Tcl_SetByteArrayObj, Tcl_GetByteArrayFromObj, Tcl_SetByteArrayLength \- manipulate Tcl values as a arrays of bytes
-.SH SYNOPSIS
-.nf
-\fB#include <tcl.h>\fR
-.sp
-Tcl_Obj *
-\fBTcl_NewByteArrayObj\fR(\fIbytes, length\fR)
-.sp
-void
-\fBTcl_SetByteArrayObj\fR(\fIobjPtr, bytes, length\fR)
-.sp
-unsigned char *
-\fBTcl_GetByteArrayFromObj\fR(\fIobjPtr, lengthPtr\fR)
-.sp
-unsigned char *
-\fBTcl_SetByteArrayLength\fR(\fIobjPtr, length\fR)
-.SH ARGUMENTS
-.AS "const unsigned char" *lengthPtr in/out
-.AP "const unsigned char" *bytes in
-The array of bytes used to initialize or set a byte-array value. May be NULL
-even if \fIlength\fR is non-zero.
-.AP int length in
-The length of the array of bytes.  It must be >= 0.
-.AP Tcl_Obj *objPtr in/out
-For \fBTcl_SetByteArrayObj\fR, this points to the value to be converted to
-byte-array type.  For \fBTcl_GetByteArrayFromObj\fR and
-\fBTcl_SetByteArrayLength\fR, this points to the value from which to get
-the byte-array value; if \fIobjPtr\fR does not already point to a byte-array
-value, it will be converted to one.
-.AP int *lengthPtr out
-If non-NULL, filled with the length of the array of bytes in the value.
-.BE
-
-.SH DESCRIPTION
-.PP
-These procedures are used to create, modify, and read Tcl byte-array values
-from C code.  Byte-array values are typically used to hold the
-results of binary IO operations or data structures created with the
-\fBbinary\fR command.  In Tcl, an array of bytes is not equivalent to a
-string.  Conceptually, a string is an array of Unicode characters, while a
-byte-array is an array of 8-bit quantities with no implicit meaning.
-Accessor functions are provided to get the string representation of a
-byte-array or to convert an arbitrary value to a byte-array.  Obtaining the
-string representation of a byte-array value (by calling
-\fBTcl_GetStringFromObj\fR) produces a properly formed UTF-8 sequence with a
-one-to-one mapping between the bytes in the internal representation and the
-UTF-8 characters in the string representation.
-.PP
-\fBTcl_NewByteArrayObj\fR and \fBTcl_SetByteArrayObj\fR will
-create a new value of byte-array type or modify an existing value to have a
-byte-array type.  Both of these procedures set the value's type to be
-byte-array and set the value's internal representation to a copy of the
-array of bytes given by \fIbytes\fR. \fBTcl_NewByteArrayObj\fR returns a
-pointer to a newly allocated value with a reference count of zero.
-\fBTcl_SetByteArrayObj\fR invalidates any old string representation and, if
-the value is not already a byte-array value, frees any old internal
-representation. If \fIbytes\fR is NULL then the new byte array contains
-arbitrary values.
-.PP
-\fBTcl_GetByteArrayFromObj\fR converts a Tcl value to byte-array type and
-returns a pointer to the value's new internal representation as an array of
-bytes.  The length of this array is stored in \fIlengthPtr\fR if
-\fIlengthPtr\fR is non-NULL.  The storage for the array of bytes is owned by
-the value and should not be freed.  The contents of the array may be
-modified by the caller only if the value is not shared and the caller
-invalidates the string representation.
-.PP
-\fBTcl_SetByteArrayLength\fR converts the Tcl value to byte-array type
-and changes the length of the value's internal representation as an
-array of bytes.  If \fIlength\fR is greater than the space currently
-allocated for the array, the array is reallocated to the new length; the
-newly allocated bytes at the end of the array have arbitrary values.  If
-\fIlength\fR is less than the space currently allocated for the array,
-the length of array is reduced to the new length.  The return value is a
-pointer to the value's new array of bytes.
-
-.SH "SEE ALSO"
-Tcl_GetStringFromObj, Tcl_NewObj, Tcl_IncrRefCount, Tcl_DecrRefCount
-
-.SH KEYWORDS
-value, binary data, byte array, utf, unicode, internationalization