// Read reads data from a BLOB incrementally.
// (See http://sqlite.org/c3ref/blob_read.html)
func (r *BlobReader) Read(v []byte) (int, error) {
if len(v) == 0 {
return 0, nil
}
size, err := r.Size()
if err != nil {
return 0, err
}
if r.ReadOffset >= size {
return 0, io.EOF
}
if len(v) > (size - r.ReadOffset) {
v = v[0 : size-r.ReadOffset]
}
p := &v[0]
n := len(v)
rv := C.sqlite3_blob_read(r.bl, unsafe.Pointer(p), C.int(n), C.int(r.ReadOffset))
if rv != C.SQLITE_OK {
return 0, r.c.error(rv, "BlobReader.Read")
}
r.ReadOffset += n
return n, nil
}
// Read reads data from a BLOB incrementally.
// (See http://sqlite.org/c3ref/blob_read.html)
func (r *BlobReader) Read(v []byte) (int, error) {
if len(v) == 0 {
return 0, nil
}
size, err := r.Size()
if err != nil {
return 0, err
}
if r.offset >= size {
return 0, io.EOF
}
n := size - r.offset
if len(v) < int(n) {
n = int32(len(v))
}
p := &v[0]
rv := C.sqlite3_blob_read(r.bl, unsafe.Pointer(p), C.int(n), C.int(r.offset))
if rv != C.SQLITE_OK {
return 0, r.c.error(rv, "BlobReader.Read")
}
r.offset += n
return int(n), nil
}