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/* Implementation of TLStringStream class.
This file is part of TL, Tiggr's Library.
Written by Tiggr <tiggr@es.ele.tue.nl>
Copyright (C) 1995, 1996 Pieter J. Schoenmakers
TL is distributed WITHOUT ANY WARRANTY.
See the file LICENSE in the TL distribution for details.
$Id: TLStringStream.m,v 1.1 1998/01/08 16:12:00 tiggr Exp $ */
#import "tl/support.h"
#import "tl/TLStringStream.h"
#import "tl/TLString.h"
@implementation TLConstantStringStream
-close
{
next = len;
return (self);
} /* -close */
-(int) fileDescriptor
{
return (-1);
} /* -fileDescriptor */
-flushInput
{
return (self);
} /* -flushInput */
-(void) gcReference
{
MARK (string);
} /* -gcReference */
-initWithString: (id <TLString>) s
{
ASGN_IVAR (string, s);
len = [s length];
c_string = (void *) [s cString];
return (self);
} /* -initWithString: */
-(int) readByte
{
return (next == len ? TL_EOF : ((unsigned char *) c_string)[next++]);
} /* -readByte */
-(int) readBytes: (int) n intoBuffer: (char *) b
{
if (next + n > len)
n = len - next;
memcpy (b, c_string + next, n);
return (n);
} /* -readBytes:intoBuffer: */
-(int) _writeRange: (id <TLRange>) r toStream: (id <TLOutputStream>) s
{
int n, start = [r _start], length = [r length];
next = start;
if (start > len)
return 0;
if (start + length > len)
length = len - start;
n = [s writeBytes: length fromBuffer: c_string + start];
if (n > 0)
next += n;
return n;
} /* _writeRange:toStream: */
-(long) _seek: (long) new_offset from: (int) pos
{
switch (pos)
{
case TLSEEK_ABSOLUTE:
break;
case TLSEEK_FROM_END:
new_offset = len - new_offset;
break;
case TLSEEK_RELATIVE:
new_offset = next + new_offset;
if (new_offset >= 0)
break;
/* Fall through. */
default:
[self error: "bad TLSEEK %d (to %d)", pos, new_offset];
return -1;
}
next = new_offset;
return next;
} /* _seek:from: */
-streamp
{
return (self);
} /* -streamp */
-(long) _tell
{
return next;
} /* -_tell */
@end
@implementation TLMutableStringStream
-initWithString: (TLMutableString *) s
{
ASGN_IVAR (string, s);
return (self);
} /* -initWithString: */
/******************** TLStream ********************/
-close
{
id s = string;
string = nil;
return (s ? self : nil);
} /* -close */
-(int) fileDescriptor
{
return (-1);
} /* -fileDescriptor */
-streamp
{
return (self);
} /* -streamp */
/******************** TLOutputStream ********************/
-flushOutput
{
return (string && [string flushOutput] ? self : nil);
} /* -flushOutput */
-(int) writeByte: (char) c
{
if (!string)
return (TL_EOF);
return ([string appendCChar: c]);
} /* -writeByte */
-(int) writeBytes: (int) n fromBuffer: (const char *) b
{
if (!string)
return (-1);
[string appendCString: b length: n];
return (n);
} /* -writeBytes:fromBuffer: */
/******************** garbage collection ********************/
-(void) gcReference
{
MARK (string);
} /* -gcReference */
@end
@implementation TLStringStream
+(id <TLMutableStream>) mutableStreamWithString: (TLMutableString *) s
{
return ([(TLMutableStringStream *) [TLMutableStringStream gcAlloc]
initWithString: s]);
} /* -streamWithString: */
+(id <TLSeekableStream, TLInputStream>) streamWithString: (id <TLString>) s
{
return ([(TLConstantStringStream *) [TLConstantStringStream gcAlloc]
initWithString: s]);
} /* -streamWithString: */
@end
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