[PATCH v3 09/19] midx: teach `nth_midxed_offset()` about incremental MIDXs

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In a similar fashion as in previous commits, teach the function
`nth_midxed_offset()` about incremental MIDXs.

The given object `pos` is used to find the containing MIDX, and
translated back into a MIDX-local position by assigning the return value
of `midx_for_object()` to it.

Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
 midx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/midx.c b/midx.c
index 83857cbd1e..346e58dec7 100644
--- a/midx.c
+++ b/midx.c
@@ -369,6 +369,8 @@ off_t nth_midxed_offset(struct multi_pack_index *m, uint32_t pos)
 	const unsigned char *offset_data;
 	uint32_t offset32;
 
+	pos = midx_for_object(&m, pos);
+
 	offset_data = m->chunk_object_offsets + (off_t)pos * MIDX_CHUNK_OFFSET_WIDTH;
 	offset32 = get_be32(offset_data + sizeof(uint32_t));
 
-- 
2.46.0.46.g406f326d27.dirty





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