paleolimbot commented on code in PR #585:
URL: https://github.com/apache/arrow-nanoarrow/pull/585#discussion_r1718638971
##########
src/nanoarrow/ipc/writer.c:
##########
@@ -329,3 +364,62 @@ ArrowErrorCode ArrowIpcWriterWriteArrayStream(struct
ArrowIpcWriter* writer,
ArrowArrayViewReset(&array_view);
return NANOARROW_OK;
}
+
+#define NANOARROW_IPC_FILE_PADDED_MAGIC "ARROW1\0"
+
+ArrowErrorCode ArrowIpcWriterStartFile(struct ArrowIpcWriter* writer,
+ struct ArrowError* error) {
+ NANOARROW_DCHECK(writer != NULL && writer->private_data != NULL);
+
+ struct ArrowIpcWriterPrivate* private =
+ (struct ArrowIpcWriterPrivate*)writer->private_data;
+
+ NANOARROW_DCHECK(!private->writing_file && private->bytes_written == 0);
+
+ struct ArrowBufferView magic = {
+ .data.data = NANOARROW_IPC_FILE_PADDED_MAGIC,
+ .size_bytes = sizeof(NANOARROW_IPC_FILE_PADDED_MAGIC),
+ };
+ NANOARROW_RETURN_NOT_OK(
+ ArrowIpcOutputStreamWrite(&private->output_stream, magic, error));
+
+ private->writing_file = 1;
+ private->bytes_written = magic.size_bytes;
+ return NANOARROW_OK;
+}
+
+ArrowErrorCode ArrowIpcWriterFinalizeFile(struct ArrowIpcWriter* writer,
+ struct ArrowError* error) {
+ NANOARROW_DCHECK(writer != NULL && writer->private_data != NULL);
+
+ struct ArrowIpcWriterPrivate* private =
+ (struct ArrowIpcWriterPrivate*)writer->private_data;
+
+ NANOARROW_DCHECK(private->writing_file);
+
+ NANOARROW_ASSERT_OK(ArrowBufferResize(&private->buffer, 0, 0));
+ NANOARROW_RETURN_NOT_OK(
+ ArrowIpcEncoderEncodeFooter(&private->encoder, &private->footer, error));
+ NANOARROW_RETURN_NOT_OK_WITH_ERROR(
+ ArrowIpcEncoderFinalizeBuffer(&private->encoder, /*encapsulate=*/0,
+ &private->buffer),
+ error);
+
+ _NANOARROW_CHECK_RANGE(private->buffer.size_bytes, 0, INT32_MAX);
+ int32_t size = (int32_t) private->buffer.size_bytes;
+ struct ArrowStringView magic =
ArrowCharView(NANOARROW_IPC_FILE_PADDED_MAGIC);
Review Comment:
I am fairly sure that this will only append 6 bytes to the end of the file
(and I think you want 8?)
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