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Check for data integrity after download #2

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b70f45a
Added md5 hashes of the original files nad script to check it.
janfrancu Jun 2, 2025
9eda612
Added list of PNG files with zero size and thus improperly formed hea…
janfrancu Jun 2, 2025
de6313b
Added a list of corrupted files present in datasets.
janfrancu Jun 3, 2025
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56 changes: 56 additions & 0 deletions data/check_md5_from_csv.sh
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Original file line number Diff line number Diff line change
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#!/bin/bash

# Usage: ./check_md5_from_csv.sh checksums.csv /path/to/search
# Checksums obtained via Google Drive v3 API - see https://stackoverflow.com/a/49043352
# This script reads a CSV file with expected MD5 checksums and original filenames,
# searches for files in a specified directory, computes their MD5 checksums,
# and compares them against the expected values.
# It can handle filenames with optional '-XXX' suffixes before the extension, which
# is common when downloading directories from Google Drive.

CSV_FILE="$1"
SEARCH_DIR="$2"

if [[ ! -f "$CSV_FILE" || ! -d "$SEARCH_DIR" ]]; then
echo "Usage: $0 checksums.csv /path/to/search"
exit 1
fi

# Remove quotes from CSV (if any), skip header
tail -n +2 "$CSV_FILE" | sed 's/"//g' | while IFS=, read -r expected_md5 original_filename; do
# Build search pattern: original_filename plus optional '-XXX' before the extension
base_name="${original_filename%.*}" # e.g., imagenet_ai_0508_adm
extension="${original_filename##*.}" # e.g., z01

# Use glob pattern for find (literal * to match optional '-XXX')
search_pattern="${base_name}-*.$extension ${base_name}.$extension"

# Find files matching the pattern
matched_file=$(find "$SEARCH_DIR" -type f \( -name "${base_name}-*.$extension" -o -name "${base_name}.$extension" \) | head -n 1)

if [[ -z "$matched_file" ]]; then
echo "❌ File not found: $original_filename"
continue
fi

# Compute the md5sum
computed_md5=$(md5sum "$matched_file" | awk '{print $1}')

# Compare checksums
if [[ "$expected_md5" == "$computed_md5" ]]; then
# Check if filename differs
actual_filename=$(basename "$matched_file")
if [[ "$actual_filename" != "$original_filename" ]]; then
echo "✅ OK (but filename differs):"
echo " Expected: $original_filename"
echo " Found: $actual_filename"
else
echo "✅ OK: $original_filename"
fi
else
echo "❗ MISMATCH: $original_filename"
echo " Expected MD5: $expected_md5"
echo " Found MD5: $computed_md5"
echo " Actual file: $(basename "$matched_file")"
fi
done
209 changes: 209 additions & 0 deletions data/checksums.csv
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md5Checksum,originalFilename
"c874b43e46d2b545c552d149a94c6102","imagenet_ai_0508_adm.z05"
"b715e17b61c12a0781da83697dc27a64","imagenet_ai_0508_adm.z06"
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