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#import "CSStreamHandle.h"
@implementation CSStreamHandle
-(id)initWithName:(NSString *)descname
{
return [self initWithName:descname length:CSHandleMaxLength];
}
-(id)initWithName:(NSString *)descname length:(off_t)length
{
if((self=[super initWithName:descname]))
{
streampos=0;
streamlength=length;
endofstream=NO;
needsreset=YES;
nextstreambyte=-1;
input=NULL;
}
return self;
}
-(id)initWithHandle:(CSHandle *)handle
{
return [self initWithHandle:handle length:CSHandleMaxLength bufferSize:4096];
}
-(id)initWithHandle:(CSHandle *)handle length:(off_t)length
{
return [self initWithHandle:handle length:length bufferSize:4096];
}
-(id)initWithHandle:(CSHandle *)handle bufferSize:(int)buffersize
{
return [self initWithHandle:handle length:CSHandleMaxLength bufferSize:buffersize];
}
-(id)initWithHandle:(CSHandle *)handle length:(off_t)length bufferSize:(int)buffersize;
{
if((self=[super initWithName:[handle name]]))
{
streampos=0;
streamlength=length;
endofstream=NO;
needsreset=YES;
nextstreambyte=-1;
input=CSInputBufferAlloc(handle,buffersize);
}
return self;
}
-(id)initAsCopyOf:(CSStreamHandle *)other
{
[self _raiseNotSupported:_cmd];
return nil;
}
-(void)dealloc
{
CSInputBufferFree(input);
[super dealloc];
}
-(off_t)fileSize { return streamlength; }
-(off_t)offsetInFile { return streampos; }
-(BOOL)atEndOfFile
{
if(needsreset) { [self resetStream]; needsreset=NO; }
if(endofstream) return YES;
if(streampos==streamlength) return YES;
if(nextstreambyte>=0) return NO;
uint8_t b[1];
@try
{
if([self streamAtMost:1 toBuffer:b]==1)
{
nextstreambyte=b[0];
return NO;
}
}
@catch(id e) {}
endofstream=YES;
return YES;
}
-(void)seekToFileOffset:(off_t)offs
{
if(![self _prepareStreamSeekTo:offs]) return;
if(offs<streampos)
{
streampos=0;
endofstream=NO;
//nextstreambyte=-1;
if(input) CSInputRestart(input);
[self resetStream];
}
if(offs==0) return;
[self readAndDiscardBytes:offs-streampos];
}
-(void)seekToEndOfFile { [self readAndDiscardAtMost:CSHandleMaxLength]; }
-(int)readAtMost:(int)num toBuffer:(void *)buffer
{
if(needsreset) { [self resetStream]; needsreset=NO; }
if(endofstream) return 0;
if(streampos+num>streamlength) num=streamlength-streampos;
if(!num) return 0;
int offs=0;
if(nextstreambyte>=0)
{
((uint8_t *)buffer)[0]=nextstreambyte;
streampos++;
nextstreambyte=-1;
offs=1;
if(num==1) return 1;
}
int actual=[self streamAtMost:num-offs toBuffer:((uint8_t *)buffer)+offs];
if(actual==0) endofstream=YES;
streampos+=actual;
return actual+offs;
}
-(void)resetStream {}
-(int)streamAtMost:(int)num toBuffer:(void *)buffer { return 0; }
-(void)endStream
{
endofstream=YES;
}
-(BOOL)_prepareStreamSeekTo:(off_t)offs
{
if(needsreset) { [self resetStream]; needsreset=NO; }
if(offs==streampos) return NO;
if(endofstream&&offs>streampos) [self _raiseEOF];
if(offs>streamlength) [self _raiseEOF];
if(nextstreambyte>=0)
{
nextstreambyte=-1;
streampos+=1;
if(offs==streampos) return NO;
}
return YES;
}
-(void)setStreamLength:(off_t)length { streamlength=length; }
-(void)setInputBuffer:(CSInputBuffer *)inputbuffer
{
CSInputBufferFree(input);
input=inputbuffer;
}
@end
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