Techniques to determine deltas of a target data structure against a source data structure. One technique includes obtaining directory level checksums and rolling checksums for a source set of code in a first data structure, obtaining directory level checksums and rolling checksums for a target set of code in a second data structure, comparing the directory level checksums and the rolling checksums obtained for the target set of code against the directory level checksums and the rolling checksums obtained for the source set of code, identifying a location of change data of the target set of code at directory level within the second data structure based on the comparison of the directory level checksums and the rolling checksums obtained for the target set of code against the directory level checksums and the rolling checksums obtained for the source set of code, and outputting the location of the change data.