calls read() on the async reader via it's handle from the C side export imgproxyReaderRead
(handle C.uintptr_t, pointer unsafe.Pointer, size C.int64_t)
| 51 | // |
| 52 | //export imgproxyReaderRead |
| 53 | func imgproxyReaderRead(handle C.uintptr_t, pointer unsafe.Pointer, size C.int64_t) C.int64_t { |
| 54 | h := cgo.Handle(handle) |
| 55 | r, ok := h.Value().(io.ReadSeeker) |
| 56 | if !ok { |
| 57 | vipsError("imgproxyReaderRead", "invalid reader handle") |
| 58 | return -1 |
| 59 | } |
| 60 | |
| 61 | buf := unsafe.Slice((*byte)(pointer), size) |
| 62 | n, err := r.Read(buf) |
| 63 | if errors.Is(err, io.EOF) { |
| 64 | return 0 |
| 65 | } else if err != nil { |
| 66 | vipsError("imgproxyReaderRead", "error reading from imgproxy source: %v", err) |
| 67 | return -1 |
| 68 | } |
| 69 | |
| 70 | return C.int64_t(n) |
| 71 | } |