Hi,
In the thread http://lurker.clamav.net/message/20111212.083121.71a17ccd.en.html I asked about memory usage when scanning a zip file.
I decided to have a look on how to change the behaviour and wrote a patch for it. I don't know if this patch is desirable or acceptable but I'm submitting it anyway.
Patch is against 0.97.3 but should apply cleanly on git master. To test the patch I tested 3 (large) files: *File 1* ZIP file of 477MB which contains 14 files. The largest file in the zip is a CAB file of 489MB. This CAB file contains: * 57079 files that are smaller than 1MB, * 112 files that are between 1MB and 10MB, * 9 files that are larger then 10 MB (the largest being 132MB) Original version: ----------- SCAN SUMMARY ----------- Known viruses: 1096211 Engine version: 0.97.3 Scanned directories: 0 Scanned files: 1 Infected files: 0 Data scanned: 990.25 MB Data read: 476.21 MB (ratio 2.08:1) Time: 103.864 sec (1 m 43 s) Patched version: ----------- SCAN SUMMARY ----------- Known viruses: 1096215 Engine version: 0.97.3 Scanned directories: 0 Scanned files: 1 Infected files: 0 Data scanned: 990.25 MB Data read: 476.21 MB (ratio 2.08:1) Time: 102.853 sec (1 m 42 s) *File 2* The CAB file extract out of the above zip file (489MB). This CAB file contains: * 57079 files that are smaller than 1MB, * 112 files that are between 1MB and 10MB, * 9 files that are larger then 10 MB (the largest being 132MB) Original version: ----------- SCAN SUMMARY ----------- Known viruses: 1096211 Engine version: 0.97.3 Scanned directories: 0 Scanned files: 1 Infected files: 0 Data scanned: 498.80 MB Data read: 489.75 MB (ratio 1.02:1) Time: 51.487 sec (0 m 51 s) Patched version: ----------- SCAN SUMMARY ----------- Known viruses: 1096215 Engine version: 0.97.3 Scanned directories: 0 Scanned files: 1 Infected files: 0 Data scanned: 498.80 MB Data read: 489.75 MB (ratio 1.02:1) Time: 51.564 sec (0 m 51 s) *File 3* Zip file of 401MB that contains 1 file, with random data, of 400 MB Original version: ----------- SCAN SUMMARY ----------- Known viruses: 1096220 Engine version: 0.97.3 Scanned directories: 0 Scanned files: 1 Infected files: 0 Data scanned: 804.19 MB Data read: 400.06 MB (ratio 2.01:1) Time: 81.984 sec (1 m 21 s) Patched version: ----------- SCAN SUMMARY ----------- Known viruses: 1096220 Engine version: 0.97.3 Scanned directories: 0 Scanned files: 1 Infected files: 0 Data scanned: 804.19 MB Data read: 400.06 MB (ratio 2.01:1) Time: 82.960 sec (1 m 22 s) Best regards, Bram
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