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fix grif_file:find() offset sub error #6

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fix grif_file:find() offset sub error #6

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2 changes: 1 addition & 1 deletion lib/resty/mongol/gridfs_file.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -157,7 +157,7 @@ function gridfs_file_mt:read(size, offset)
r = self.chunk_col:find_one({files_id = self.files_id, n = n})
if not r then return nil, "read chunk failed" end
if size - rn < self.chunk_size then
bytes = bytes .. string.sub(r.data, 1, size - rn)
bytes = bytes .. string.sub(r.data, offset + 1, offset + size - rn)
rn = size
else
bytes = bytes .. r.data
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