bkietz commented on code in PR #598:
URL: https://github.com/apache/arrow-nanoarrow/pull/598#discussion_r1739299778
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src/nanoarrow/integration/ipc_integration.cc:
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@@ -166,35 +169,62 @@ struct MaterializedArrayStream {
// Footer).
File ipc_file;
NANOARROW_RETURN_NOT_OK(ipc_file.open(path, "rb", error));
- return FromIpcFile(ipc_file, error);
- }
+ auto bytes = ipc_file.read();
- ArrowErrorCode FromIpcFile(FILE* ipc_file, struct ArrowError* error) {
- char prefix[sizeof(NANOARROW_IPC_FILE_PADDED_MAGIC)] = {};
- if (fread(&prefix, 1, sizeof(prefix), ipc_file) < sizeof(prefix)) {
- ArrowErrorSet(error, "Expected file of more than %lu bytes, got %ld",
- sizeof(prefix), ftell(ipc_file));
+ auto min_size = sizeof(NANOARROW_IPC_FILE_PADDED_MAGIC) + sizeof(int32_t) +
+ strlen(NANOARROW_IPC_FILE_PADDED_MAGIC);
+ if (bytes.size() < min_size) {
+ ArrowErrorSet(error, "Expected file of more than %lu bytes, got %ld",
min_size,
+ bytes.size());
return EINVAL;
}
- if (memcmp(&prefix, NANOARROW_IPC_FILE_PADDED_MAGIC, sizeof(prefix)) != 0)
{
+ if (memcmp(bytes.data(), NANOARROW_IPC_FILE_PADDED_MAGIC,
+ sizeof(NANOARROW_IPC_FILE_PADDED_MAGIC)) != 0) {
ArrowErrorSet(error, "File did not begin with 'ARROW1\\0\\0'");
return EINVAL;
}
- nanoarrow::ipc::UniqueInputStream input_stream;
- NANOARROW_RETURN_NOT_OK_WITH_ERROR(
- ArrowIpcInputStreamInitFile(input_stream.get(), ipc_file,
- /*close_on_release=*/false),
- error);
+ nanoarrow::ipc::UniqueDecoder decoder;
+ NANOARROW_RETURN_NOT_OK_WITH_ERROR(ArrowIpcDecoderInit(decoder.get()),
error);
+ NANOARROW_RETURN_NOT_OK(ArrowIpcDecoderVerifyFooter(
+ decoder.get(), {{bytes.data()}, static_cast<int64_t>(bytes.size())},
error));
+ NANOARROW_RETURN_NOT_OK(ArrowIpcDecoderDecodeFooter(
+ decoder.get(), {{bytes.data()}, static_cast<int64_t>(bytes.size())},
error));
- nanoarrow::UniqueArrayStream array_stream;
NANOARROW_RETURN_NOT_OK_WITH_ERROR(
- ArrowIpcArrayStreamReaderInit(array_stream.get(), input_stream.get(),
- /*options=*/nullptr),
- error);
+ ArrowSchemaDeepCopy(&decoder->footer->schema, schema.get()), error);
+ NANOARROW_RETURN_NOT_OK(
+ ArrowIpcDecoderSetSchema(decoder.get(), &decoder->footer->schema,
error));
+ NANOARROW_RETURN_NOT_OK_WITH_ERROR(
+ ArrowIpcDecoderSetEndianness(decoder.get(), decoder->endianness),
error);
Review Comment:
Endianness is a flag in the IPC schema message, but not in ArrowSchema which
is what `decoder->footer->schema` is, so we need to set it up separately
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