From b433c66eb3318bfe8156aea4d161e96c040080d7 Mon Sep 17 00:00:00 2001
From: Mathis Rosenhauer <rosenhauer@dkrz.de>
Date: Mon, 3 Apr 2023 17:17:24 +0200
Subject: [PATCH] decode: seek to RSI
---
src/decode.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/src/decode.c b/src/decode.c
index ef89e36..efb08c2 100644
--- a/src/decode.c
+++ b/src/decode.c
@@ -825,3 +825,30 @@ int aec_buffer_decode(struct aec_stream *strm)
aec_decode_end(strm);
return status;
}
+
+int aec_buffer_seek(struct aec_stream *strm,
+ size_t byte_offset,
+ unsigned char bit_offset)
+{
+ struct internal_state *state = strm->state;
+
+ if (bit_offset > 7)
+ return AEC_CONF_ERROR;
+
+ if (strm->avail_in < byte_offset)
+ return AEC_MEM_ERROR;
+
+ strm->next_in += byte_offset;
+ strm->avail_in -= byte_offset;
+
+ if (bit_offset > 0) {
+ if (strm->avail_in < 1)
+ return AEC_MEM_ERROR;
+
+ state->acc = (uint64_t)strm->next_in[0];
+ state->bitp = 8 - bit_offset;
+ strm->next_in++;
+ strm->avail_in--;
+ }
+ return AEC_OK;
+}
--
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