| dbc2dbf {datazoom.amazonia} | R Documentation |
Decompress a DBC (compressed DBF) file
Description
This function allows you decompress a DBC file into its DBF counterpart. Please note that this is the file format used by the Brazilian Ministry of Health (DATASUS), and it is not related to the FoxPro or CANdb DBC file formats.
Usage
dbc2dbf(input.file, output.file)
Arguments
input.file |
The name of the DBC file (including extension) |
output.file |
The output file name (including extension) |
Details
DBC is the extension for compressed DBF files (from the 'XBASE' family of databases). This is a proprietary file format used by the brazilian government to make available public healthcare datasets (by it's agency called DATASUS).
It uses internally the PKWare's Data Compression Library (DCL) "implode" compression algorithm. When decompressed, it becomes a regular DBF file.
Value
Return TRUE if succeded, FALSE otherwise.
Author(s)
Daniela Petruzalek, daniela.petruzalek@gmail.com
Source
The internal C code for dbc2dbf is based on blast decompressor and blast-dbf (see References).
References
The PKWare ZIP file format documentation (contains the "implode" algorithm specification) available at https://support.pkware.com, current version https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT.
blast source code in C: https://github.com/madler/zlib/tree/master/contrib/blast
blast-dbf, DBC to DBF command-line decompression tool: https://github.com/eaglebh/blast-dbf
See Also
read.dbc
Examples
## Not run:
# Input file name
in.f <- system.file("files/sids.dbc", package = "read.dbc")
# Output file name
out.f <- tempfile(fileext = ".dbc")
# The call return logi = TRUE on success
if (dbc2dbf(input.file = in.f, output.file = out.f)) {
print("File decompressed!")
file.remove(out.f)
}
## End(Not run)