static int file_read_header(avro_reader_t reader,
avro_schema_t * writers_schema, char *sync,
int synclen)
{
int rval;
avro_schema_t meta_schema;
avro_schema_t meta_values_schema;
avro_datum_t meta;
char magic[4];
avro_datum_t schema_bytes;
char *p;
int64_t len;
avro_schema_error_t schema_error;
check(rval, avro_read(reader, magic, sizeof(magic)));
if (magic[0] != 'O' || magic[1] != 'b' || magic[2] != 'j'
|| magic[3] != 1) {
return EILSEQ;
}
meta_values_schema = avro_schema_bytes();
meta_schema = avro_schema_map(meta_values_schema);
rval = avro_read_data(reader, meta_schema, NULL, &meta);
if (rval) {
return EILSEQ;
}
check(rval, avro_map_get(meta, "avro.schema", &schema_bytes));
avro_bytes_get(schema_bytes, &p, &len);
check(rval,
avro_schema_from_json(p, len, writers_schema, &schema_error));
avro_schema_decref(meta);
return avro_read(reader, sync, synclen);
}
static int
avro_datum_value_grab_bytes(const avro_value_iface_t *iface,
const void *vself, avro_wrapped_buffer_t *dest)
{
AVRO_UNUSED(iface);
const avro_datum_t self = (const avro_datum_t) vself;
check_param(EINVAL, self, "datum instance");
int rval;
char *bytes;
int64_t sz;
check(rval, avro_bytes_get(self, &bytes, &sz));
/* nothing clever, just make a copy */
return avro_wrapped_buffer_new_copy(dest, bytes, sz);
}
static int
avro_datum_value_get_bytes(const avro_value_iface_t *iface,
const void *vself, const void **buf, size_t *size)
{
AVRO_UNUSED(iface);
const avro_datum_t self = (const avro_datum_t) vself;
check_param(EINVAL, self, "datum instance");
int rval;
char *bytes;
int64_t sz;
check(rval, avro_bytes_get(self, &bytes, &sz));
if (buf != NULL) {
*buf = (const void *) bytes;
}
if (size != NULL) {
*size = sz;
}
return 0;
}
