GDAL-VSI-SOZIP(1) GDAL GDAL-VSI-SOZIP(1)

gdal-vsi-sozip - SOZIP (Seek-Optimized ZIP) related commands.

Added in version 3.11.

The gdal vsi sozip utility can be used to:

  • create a SOZip (Seek-Optimized ZIP) file
  • append files to an existing ZIP/SOZip file
  • list the contents of a ZIP/SOZip file
  • validate a SOZip file
  • convert an existing Zip file into a SOZip optimized one

Usage: gdal vsi sozip <SUBCOMMAND> [OPTIONS]
where <SUBCOMMAND> is one of:
  - create:   Create a Seek-optimized ZIP (SOZIP) file.
  - list:     List content of a ZIP file, with SOZIP related information.
  - optimize: Create a Seek-optimized ZIP (SOZIP) file from a regular ZIP file.
  - validate: Validate a ZIP file, possibly using SOZIP optimization.
Common Options:
  -h, --help              Display help message and exit
  --json-usage            Display usage as JSON document and exit
  --config <KEY>=<VALUE>  Configuration option [may be repeated]

Adds one or several files to a new or existing zip file.

Usage: gdal vsi sozip create [OPTIONS] <INPUT> <OUTPUT>
Create a Seek-optimized ZIP (SOZIP) file.
Positional arguments:
  -i, --input <INPUT>                                          Input filenames [may be repeated] [required]
  -o, --output <OUTPUT>                                        Output ZIP filename [required]
Common Options:
  -h, --help                                                   Display help message and exit
  --json-usage                                                 Display usage as JSON document and exit
  --config <KEY>=<VALUE>                                       Configuration option [may be repeated]
  --progress                                                   Display progress bar
Options:
  --overwrite                                                  Whether overwriting existing output is allowed
  -r, --recursive                                              Travels the directory structure of the specified directories recursively
  -j, --junk-paths, --no-paths                                 Store just the name of a saved file, and do not store directory names
  --enable-sozip <ENABLE-SOZIP>                                Whether to automatically/systematically/never apply the SOZIP optimization. ENABLE-SOZIP=auto|yes|no (default: auto)
  --sozip-chunk-size <value in bytes or with K/M suffix>       Chunk size for a seek-optimized file (default: 32768)
  --sozip-min-file-size <value in bytes or with K/M/G suffix>  Minimum file size to decide if a file should be seek-optimized (default: 1 MB)
  --content-type <CONTENT-TYPE>                                Store the Content-Type of the file being added.
  -q, --quiet                                                  Quiet mode

Input filenames. Required. Several file names or directory names accepted.
Output ZIP filename. Required. Must have a .zip extension
Whether overwriting existing output is allowed.
Travels the directory structure of the specified directories recursively.
Store just the name of a saved file (junk the path), and do not store directory names. By default, sozip will store the full path (relative to the current directory).
In auto mode, a file is seek-optimized only if its size is above the value of --sozip-min-file-size. In yes mode, all input files will be seek-optimized. In no mode, no input files will be seek-optimized.
Chunk size for a seek-optimized file. Defaults to 32768 bytes. The value is specified in bytes, or K and M suffix (optionally preceded by a space) can be respectively used to specify a value in kilo-bytes or mega-bytes.
Minimum file size to decide if a file should be seek-optimized, in --enable-sozip=auto mode. Defaults to 1 MB byte. The value is specified in bytes, or K, M or G suffix (optionally preceded by a space) can be respectively used to specify a value in kilo-bytes, mega-bytes or giga-bytes.
Store the Content-Type for the file being added as a key-value pair in the extra field extension 'KV' (0x564b) dedicated to storing key-value pair metadata
Do not output any informative message (only errors).

The GDAL_NUM_THREADS configuration option can be set to ALL_CPUS or a integer value to specify the number of threads to use for SOZip-compressed files. Defaults to ALL_CPUS.

gdal vsi sozip create my.gpkg my.gpkg.zip

gdal vsi sozip create -r source_dir/ my.gpkg.zip

Create a new zip file from the content of an existing one, possibly applying SOZip optimization when relevant.

Usage: gdal vsi sozip optimize [OPTIONS] <INPUT> <OUTPUT>
Create a Seek-optimized ZIP (SOZIP) file from a regular ZIP file.
Positional arguments:
  -i, --input <INPUT>                                          Input ZIP filename [required]
  -o, --output <OUTPUT>                                        Output ZIP filename [required]
Common Options:
  -h, --help                                                   Display help message and exit
  --json-usage                                                 Display usage as JSON document and exit
  --config <KEY>=<VALUE>                                       Configuration option [may be repeated]
  --progress                                                   Display progress bar
Options:
  --overwrite                                                  Whether overwriting existing output is allowed
  --enable-sozip <ENABLE-SOZIP>                                Whether to automatically/systematically/never apply the SOZIP optimization. ENABLE-SOZIP=auto|yes|no (default: auto)
  --sozip-chunk-size <value in bytes or with K/M suffix>       Chunk size for a seek-optimized file (default: 32768)
  --sozip-min-file-size <value in bytes or with K/M/G suffix>  Minimum file size to decide if a file should be seek-optimized (default: 1 MB)
  -q, --quiet                                                  Quiet mode

Input ZIP filename. Required.
Output ZIP filename. Required. Must have a .zip extension
Whether overwriting existing output is allowed.
In auto mode, a file is seek-optimized only if its size is above the value of --sozip-chunk-size. In yes mode, all input files will be seek-optimized. In no mode, no input files will be seek-optimized.
Chunk size for a seek-optimized file. Defaults to 32768 bytes. The value is specified in bytes, or K and M suffix can be respectively used to specify a value in kilo-bytes or mega-bytes.
Minimum file size to decide if a file should be seek-optimized, in --enable-sozip=auto mode. Defaults to 1 MB byte. The value is specified in bytes, or K, M or G suffix can be respectively used to specify a value in kilo-bytes, mega-bytes or giga-bytes.
Do not output any informative message (only errors).

The GDAL_NUM_THREADS configuration option can be set to ALL_CPUS or a integer value to specify the number of threads to use for SOZip-compressed files. Defaults to ALL_CPUS.

gdal vsi sozip optimize in.zip sozip_optimized.zip

List the files contained in the zip file in an output similar to Info-ZIP unzip utility, but with the addition of a column indicating whether each file is seek-optimized.

Usage: gdal vsi sozip list [OPTIONS] <INPUT>
List content of a ZIP file, with SOZIP related information.
Positional arguments:
  -i, --input <INPUT>     Input ZIP filename [required]
Common Options:
  -h, --help              Display help message and exit
  --json-usage            Display usage as JSON document and exit
  --config <KEY>=<VALUE>  Configuration option [may be repeated]

Input ZIP filename. Required.

gdal vsi sozip list my.zip

Validates a SOZip file. Baseline ZIP validation is done in a light way, limited to being able to browse through ZIP records with the InfoZIP-based ZIP reader used by GDAL. But validation of the SOZip-specific aspects is done in a more thorougful way.

Usage: gdal vsi sozip list [OPTIONS] <INPUT>
List content of a ZIP file, with SOZIP related information.
Positional arguments:
  -i, --input <INPUT>     Input ZIP filename [required]
Common Options:
  -h, --help              Display help message and exit
  --json-usage            Display usage as JSON document and exit
  --config <KEY>=<VALUE>  Configuration option [may be repeated]

Input ZIP filename. Required.
Do not output any informative message (only errors).
Turn on verbose mode.

gdal vsi sozip validate my.zip

Even Rouault <even.rouault@spatialys.com>

1998-2025

May 6, 2025