Check the Integrity of a ZIP File — check

Tests the integrity of a ZIP file using the unzip -t system command. Verifies that the file exists, is non-empty, has a .zip extension, and passes the integrity check. Returns FALSE with a warning if the file is invalid or if unzip is unavailable.

Usage

check_zip(file = NULL, warning = TRUE)

Arguments

file: Character. Path to a ZIP file. Must be a single, non-empty string.
warning: Logical. If TRUE, issues a warning if the file does not exist, is empty, or fails the integrity check. Default is TRUE.

Value

Logical: TRUE if the file exists, is non-empty, and passes the integrity check; FALSE otherwise, accompanied by a warning explaining the failure.

Note

Requires the unzip system command.

Author

Ahmed El-Gabbas

Examples


# |||||||||||||||||||||||||||||||||||||||
# Create ZIP files
# |||||||||||||||||||||||||||||||||||||||

# valid ZIP file
temp_dir <- fs::path_temp("check_zip")
fs::dir_create(temp_dir)
temp_file <- fs::path(temp_dir, "test.txt")
writeLines("Hello, world!", temp_file)
zip_file <- fs::path(temp_dir, "valid.zip")
zip(zip_file, temp_file, flags = "-jq")

# invalid ZIP file (corrupted)
bad_zip <- fs::path(temp_dir, "invalid.zip")
writeLines("Not a ZIP file", bad_zip)

# empty ZIP file
empty_zip <- fs::path(temp_dir, "empty.zip")
fs::file_create(empty_zip)

# non-ZIP file
non_zip_file <- fs::path(temp_dir, "test.txt")
writeLines("Hello, world!", non_zip_file)

# |||||||||||||||||||||||||||||||||||||||
# Check ZIP files
# |||||||||||||||||||||||||||||||||||||||

check_zip(zip_file)                              # TRUE
#> [1] TRUE

check_zip(bad_zip)                               # FALSE, with warning
#> Warning: Not a valid ZIP file: /tmp/RtmphTiYIO/check_zip/invalid.zip
#> [1] FALSE
check_zip(bad_zip, warning = FALSE)              # FALSE, without warning
#> [1] FALSE

# non-existent file
check_zip("nonexistent.zip")                     # FALSE, with warning
#> Warning: File does not exist: /home/runner/work/ecokit/ecokit/docs/reference/nonexistent.zip
#> [1] FALSE
check_zip("nonexistent.zip", warning = FALSE)    # FALSE, without warning
#> [1] FALSE

check_zip(empty_zip)                             # FALSE, with warning
#> Warning: File is empty: /tmp/RtmphTiYIO/check_zip/empty.zip
#> [1] FALSE
check_zip(empty_zip, warning = FALSE)            # FALSE, without warning
#> [1] FALSE

check_zip(non_zip_file)                          # FALSE, with warning
#> Warning: Not a valid ZIP file: /tmp/RtmphTiYIO/check_zip/test.txt
#> [1] FALSE
check_zip(non_zip_file, warning = FALSE)         # FALSE, without warning
#> [1] FALSE

# clean up
fs::file_delete(c(zip_file, bad_zip, empty_zip, temp_file))
fs::dir_delete(temp_dir)