static int
set_pos_rel_callback(void *id, int32_t delta, int mode)
{
assert(nullptr != id);
WavPackDecoder *decoder = static_cast<WavPackDecoder *>(id);
InputSource *inputSource = decoder->GetInputSource();
if(!inputSource->SupportsSeeking())
return -1;
// Adjust offset as required
SInt64 offset = delta;
switch(mode) {
case SEEK_SET:
// offset remains unchanged
break;
case SEEK_CUR:
offset += inputSource->GetOffset();
break;
case SEEK_END:
offset += inputSource->GetLength();
break;
}
return (!inputSource->SeekToOffset(offset));
}
static int
set_pos_abs_callback(void *id, uint32_t pos)
{
assert(nullptr != id);
WavPackDecoder *decoder = static_cast<WavPackDecoder *>(id);
return !decoder->GetInputSource()->SeekToOffset(pos);
}
static uint32_t
get_pos_callback(void *id)
{
assert(nullptr != id);
WavPackDecoder *decoder = static_cast<WavPackDecoder *>(id);
return static_cast<uint32_t>(decoder->GetInputSource()->GetOffset());
}
static int32_t
read_bytes_callback(void *id, void *data, int32_t bcount)
{
assert(nullptr != id);
WavPackDecoder *decoder = static_cast<WavPackDecoder *>(id);
return static_cast<int32_t>(decoder->GetInputSource()->Read(data, bcount));
}
static int
can_seek_callback(void *id)
{
assert(nullptr != id);
WavPackDecoder *decoder = static_cast<WavPackDecoder *>(id);
return static_cast<uint32_t>(decoder->GetInputSource()->SupportsSeeking());
}
static uint32_t
get_length_callback(void *id)
{
assert(NULL != id);
WavPackDecoder *decoder = static_cast<WavPackDecoder *>(id);
return static_cast<uint32_t>(decoder->GetInputSource()->GetLength());
}
// FIXME: How does one emulate ungetc when the data is non-seekable?
static int
push_back_byte_callback(void *id, int c)
{
assert(nullptr != id);
WavPackDecoder *decoder = static_cast<WavPackDecoder *>(id);
InputSource *inputSource = decoder->GetInputSource();
if(!inputSource->SupportsSeeking())
return EOF;
if(!inputSource->SeekToOffset(inputSource->GetOffset() - 1))
return EOF;
return c;
}
uint32_t wpd_get_length_shim(void *id)
{
WavPackDecoder* d = (WavPackDecoder*)id;
return d->getLength();
}
int wpd_push_back_byte_shim(void *id, int c)
{
WavPackDecoder* d = (WavPackDecoder*)id;
return d->pushBackByte(c);
}
uint32_t wpd_get_pos_shim(void *id)
{
WavPackDecoder* d = (WavPackDecoder*)id;
return d->getPos();
}
int32_t wpd_read_bytes_shim(void *id, void *data, int32_t bcount)
{
WavPackDecoder* d = (WavPackDecoder*)id;
return d->readBytes(data, bcount);
}