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#import "XADWinZipWavPackHandle.h"
#import "XADException.h"
#define SamplesPerBuffer 4096
extern WavpackStreamReader inputreader;
@implementation XADWinZipWavPackHandle
-(id)initWithHandle:(CSHandle *)handle length:(off_t)length
{
if((self=[super initWithHandle:handle length:length]))
{
context=NULL;
buffer=NULL;
}
return self;
}
-(void)dealloc
{
if(context) WavpackCloseFile(context);
free(buffer);
[super dealloc];
}
-(void)resetBlockStream
{
if(context) { WavpackCloseFile(context); context=NULL; }
free(buffer); buffer=NULL;
char error[80];
context=WavpackOpenFileInputEx(&inputreader,input,NULL,error,OPEN_WRAPPER,0);
if(!context) [NSException raise:@"WavPackException" format:@"Error opening WavPack stream: %s",error];
int numchannels=WavpackGetNumChannels(context);
buffer=malloc(numchannels*SamplesPerBuffer*4);
header=YES;
}
-(int)produceBlockAtOffset:(off_t)pos
{
if(header)
{
header=NO;
headerlength=WavpackGetWrapperBytes(context);
[self setBlockPointer:WavpackGetWrapperData(context)];
return headerlength;
}
else
{
int numchannels=WavpackGetNumChannels(context);
int bytespersample=WavpackGetBytesPerSample(context);
int numsamples=WavpackUnpackSamples(context,(int32_t *)buffer,SamplesPerBuffer);
if(numsamples)
{
int32_t *expandedptr=(int32_t *)buffer;
uint8_t *compactptr=buffer;
switch(bytespersample)
{
case 1:
for(int i=0;i<numsamples*numchannels;i++)
{
int32_t value=*expandedptr++;
*compactptr++=(value+0x80)&0xff;
}
break;
case 2:
for(int i=0;i<numsamples*numchannels;i++)
{
int32_t value=*expandedptr++;
*compactptr++=value&0xff;
*compactptr++=(value>>8)&0xff;
}
break;
case 3:
for(int i=0;i<numsamples*numchannels;i++)
{
int32_t value=*expandedptr++;
*compactptr++=value&0xff;
*compactptr++=(value>>8)&0xff;
*compactptr++=(value>>16)&0xff;
}
break;
case 4:
for(int i=0;i<numsamples*numchannels;i++)
{
int32_t value=*expandedptr++;
*compactptr++=value&0xff;
*compactptr++=(value>>8)&0xff;
*compactptr++=(value>>16)&0xff;
*compactptr++=(value>>24)&0xff;
}
break;
}
[self setBlockPointer:buffer];
return numchannels*numsamples*bytespersample;
}
else
{
[self setBlockPointer:WavpackGetWrapperData(context)+headerlength];
[self endBlockStream];
return WavpackGetWrapperBytes(context)-headerlength;
}
}
}
@end
static int32_t ReadBytes(void *context,void *data,int32_t numbytes)
{
CSInputBuffer *input=context;
uint8_t *buffer=data;
for(int i=0;i<numbytes;i++)
{
if(CSInputAtEOF(input)) return i;
buffer[i]=CSInputNextByte(input);
}
return numbytes;
}
static uint32_t GetPos(void *context)
{
CSInputBuffer *input=context;
return CSInputBufferOffset(input);
}
static int SetPosAbs(void *context,uint32_t pos)
{
CSInputBuffer *input=context;
CSInputSeekToBufferOffset(input,pos);
return 0;
}
static int SetPosRel(void *context,int32_t delta,int mode)
{
CSInputBuffer *input=context;
switch(mode)
{
case SEEK_SET: CSInputSeekToBufferOffset(input,delta); break;
case SEEK_CUR: CSInputSeekToBufferOffset(input,CSInputBufferOffset(input)+delta); break;
case SEEK_END: [XADException raiseNotSupportedException]; break;
}
return 0;
}
static int PushBackByte(void *context,int c) { [XADException raiseNotSupportedException]; return EOF; }
static uint32_t GetLength(void *context) { return 0; }
static int CanSeek(void *context) { return 1; }
WavpackStreamReader inputreader=
{
.read_bytes=ReadBytes,
.get_pos=GetPos,
.set_pos_abs=SetPosAbs,
.set_pos_rel=SetPosRel,
.push_back_byte=PushBackByte,
.get_length=GetLength,
.can_seek=CanSeek,
.write_bytes=NULL,
};
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