--- /dev/null
+! Copyright (C) 2018 John Benediktsson
+! See http://factorcode.org/license.txt for BSD license
+
+USING: accessors alien.c-types alien.endian alien.strings assocs
+calendar calendar.parser classes.struct combinators fry io
+io.binary io.encodings.8-bit io.encodings.ascii
+io.encodings.binary io.encodings.string io.files
+io.streams.byte-array kernel math math.parser namespaces
+sequences splitting strings ;
+
+IN: dbf
+
+SYMBOL: dbf-encoding
+
+CONSTANT: dbf-encodings H{
+ { 0x00 ascii }
+ { 0x01 cp437 }
+ { 0x02 cp850 }
+ { 0x03 windows-1252 }
+ { 0x04 mac-roman }
+ { 0x08 cp865 }
+ { 0x09 cp437 }
+ { 0x0A cp850 }
+ { 0x0B cp437 }
+ { 0x0D cp437 }
+ { 0x0E cp850 }
+ { 0x0F cp437 }
+ { 0x10 cp850 }
+ { 0x11 cp437 }
+ { 0x12 cp850 }
+ { 0x13 "cp932" }
+ { 0x14 cp850 }
+ { 0x15 cp437 }
+ { 0x16 cp850 }
+ { 0x17 cp865 }
+ { 0x18 cp437 }
+ { 0x19 cp437 }
+ { 0x1A cp850 }
+ { 0x1B cp437 }
+ { 0x1C cp863 }
+ { 0x1D cp850 }
+ { 0x1F cp852 }
+ { 0x22 cp852 }
+ { 0x23 cp852 }
+ { 0x24 cp860 }
+ { 0x25 cp850 }
+ { 0x26 cp866 }
+ { 0x37 cp850 }
+ { 0x40 cp852 }
+ { 0x4D "cp936" }
+ { 0x4E "cp949" }
+ { 0x4F "cp950" }
+ { 0x50 "cp874" }
+ { 0x57 windows-1252 }
+ { 0x58 windows-1252 }
+ { 0x59 windows-1252 }
+ { 0x64 cp852 }
+ { 0x65 cp866 }
+ { 0x66 cp865 }
+ { 0x67 cp861 }
+ { 0x68 f }
+ { 0x69 f }
+ { 0x6a "cp737" }
+ { 0x6b cp857 }
+ { 0x6c cp863 }
+ { 0x78 "cp950" }
+ { 0x79 "cp949" }
+ { 0x7a "cp936" }
+ { 0x7b "cp932" }
+ { 0x7c "cp874" }
+ { 0x7d windows-1255 }
+ { 0x7e windows-1256 }
+ { 0x86 "cp737" }
+ { 0x87 cp852 }
+ { 0x88 cp857 }
+ { 0x96 "mac-cyrillic" }
+ { 0x97 "mac-latin2" }
+ { 0x98 "mac-greek" }
+ { 0xc8 windows-1250 }
+ { 0xc9 windows-1251 }
+ { 0xca windows-1254 }
+ { 0xcb windows-1253 }
+ { 0xcc windows-1250 }
+}
+
+CONSTANT: dbf-file-types H{
+ { 0x02 "FoxBASE" }
+ { 0x03 "FoxBASE+/dBase III plus, no memo" }
+ { 0x04 "dBase IV, no memo" }
+ { 0x05 "dBase V, no memo" }
+ { 0x07 "Visual Objects 1.x" }
+ { 0x30 "Visual FoxPro" }
+ { 0x31 "Visual FoxPro, autoincrement enabled" }
+ { 0x32 "Visual FoxPro with field type Varchar or Varbinary" }
+ { 0x43 "dBase IV SQL table files, no memo" }
+ { 0x63 "dBase IV SQL system files, no memo" }
+ { 0x7b "dBase IV, with memo" }
+ { 0x83 "FoxBASE+/dBase III PLUS, with memo" }
+ { 0x87 "Visual Objects 1.x, with memo" }
+ { 0x8B "dBase IV with memo" }
+ { 0x8E "dBase IV with SQL table" }
+ { 0xCB "dBase IV SQL table files, with memo" }
+ { 0xE5 "HiPer-Six format with SMT memo file" }
+ { 0xF5 "FoxPro 2.x (or earlier) with memo" }
+ { 0xFB "FoxBASE" }
+}
+
+STRUCT: dbf-file-header
+ { file-type uint8_t }
+ { year uint8_t }
+ { month uint8_t }
+ { day uint8_t }
+ { #records uint32_t }
+ { header-length uint16_t }
+ { record-length uint16_t }
+ { reserved1 uint16_t }
+ { incomplete-transaction uint8_t }
+ { encryption-flag uint8_t }
+ { free-record-thread uint32_t }
+ { reserved2 uint32_t }
+ { reserved3 uint32_t }
+ { mdx-flag uint8_t }
+ { language-driver uint8_t }
+ { reserved4 uint16_t } ;
+
+: read-file-header ( -- file-header )
+ dbf-file-header read-struct ;
+
+CONSTANT: dbf-field-flags H{
+ { 0x01 "System Column (not visible to user)" }
+ { 0x02 "Column can store null values" }
+ { 0x04 "Binary column (for CHAR and MEMO only)" }
+ { 0x06 "(0x02+0x04) When a field is NULL and binary (Integer, Currency, and Character/Memo fields)" }
+ { 0x0C "Column is autoincrementing" }
+}
+
+STRUCT: dbf-field-header
+ { name uint8_t[11] }
+ { type uint8_t }
+ { address uint32_t }
+ { length uint8_t }
+ { #decimals uint8_t }
+ { reserved1 uint16_t }
+ { workarea-id uint8_t }
+ { reserved2 uint8_t }
+ { reserved3 uint8_t }
+ { set-fields-flag uint8_t }
+ { reserved4 uint8_t[7] }
+ { index-field-flag uint8_t } ;
+
+: read-field-headers ( -- field-headers )
+ [ read1 dup { CHAR: \r CHAR: \n f } member? not ] [
+ dbf-field-header heap-size 1 - read swap prefix
+ dbf-field-header memory>struct
+ ] produce nip ;
+
+: check-field-header ( field-header -- field-header )
+ dup type>> {
+ { CHAR: I [ dup length>> 4 assert= ] }
+ { CHAR: L [ dup length>> 1 assert= ] }
+ { CHAR: O [ dup length>> 8 assert= ] }
+ { CHAR: Y [ dup length>> 8 assert= ] }
+ { CHAR: D [ dup length>> 8 assert= ] }
+ { CHAR: T [ dup length>> 8 assert= ] }
+ { CHAR: M [ dup length>> 10 assert= ] }
+ [ drop ]
+ } case ;
+
+: check-record-length ( file-header field-headers -- )
+ [ record-length>> ] [ [ length>> ] map-sum ] bi* assert= ;
+
+DEFER: parse-field
+
+TUPLE: record deleted? values ;
+
+: read-records ( field-headers -- records )
+ [ read1 dup { 0x1a f } member? not ]
+ [
+ CHAR: * = over [
+ [ length>> read ]
+ [ type>> parse-field ] bi
+ ] map record boa
+ ] produce 2nip ;
+
+TUPLE: dbf file-header field-headers records ;
+
+: load-dbf ( path -- dbf )
+ binary [
+ read-file-header
+ read-field-headers
+ over header-length>> seek-absolute seek-input
+ over language-driver>> dbf-encodings at dbf-encoding [
+ dup read-records dbf boa
+ ] with-variable
+ ] with-file-reader ;
+
+: seek-record ( n file-header -- )
+ [ record-length>> * ] [ header-length>> ] bi +
+ seek-absolute seek-input ;
+
+: parse-string ( byte-array -- string )
+ [ " \0" member? ] trim-tail dbf-encoding get decode ;
+
+: parse-date ( byte-array -- date/f )
+ dup [ " \0" member? ] all? [ drop f ] [
+ binary [ (ymd>timestamp) ] with-byte-reader
+ ] if ;
+
+: parse-float ( byte-array -- n )
+ [ "\r\n\t *" member? ] trim string>number ;
+
+: parse-int ( byte-array -- n )
+ dup length 4 assert= le> ;
+
+: parse-short ( byte-array -- n )
+ dup length 2 assert= le> ;
+
+SYMBOL: unknown
+
+ERROR: illegal-logical value ;
+
+: parse-logical ( byte-array -- n )
+ first {
+ { [ dup "TtYy" member? ] [ drop t ] }
+ { [ dup "FfNn" member? ] [ drop f ] }
+ { [ dup "? " member? ] [ drop unknown ] }
+ [ illegal-logical ]
+ } cond ;
+
+: parse-numeric ( byte-array -- n )
+ [ "\r\n\t *" member? ] trim "," "." replace string>number ;
+
+: parse-double ( byte-array -- n )
+ dup length 8 assert= le> bits>double ;
+
+: parse-currency ( byte-array -- n )
+ dup length 8 assert= le> 10000 / ;
+
+: parse-timestamp ( byte-array -- timestamp )
+ [ -4713 1 1 <date> ] dip 4 cut [ le> ] bi@
+ [ days time+ ] [ milliseconds time+ ] bi* ;
+
+ERROR: unsupported-field-type type ;
+
+: parse-field ( byte-array type -- data )
+ {
+ { CHAR: \0 [ ] }
+ { CHAR: 2 [ parse-short ] }
+ { CHAR: 4 [ parse-int ] }
+ { CHAR: 8 [ parse-double ] }
+ { CHAR: C [ parse-string ] }
+ { CHAR: D [ parse-date ] }
+ { CHAR: F [ parse-float ] }
+ { CHAR: I [ parse-int ] }
+ { CHAR: L [ parse-logical ] }
+ { CHAR: N [ parse-numeric ] }
+ { CHAR: O [ parse-double ] }
+ { CHAR: V [ parse-string ] }
+ { CHAR: Y [ parse-currency ] }
+ { CHAR: @ [ parse-timestamp ] }
+ ! { CHAR: + [ parse-autoincrement ] }
+ ! { CHAR: M [ parse-memo ] }
+ ! { CHAR: T [ parse-datetime ] }
+ ! { CHAR: B [ parse-double? ] } ! (only on dbversion in [0x30, 0x31, 0x32])
+ ! { CHAR: G [ parse-general ] }
+ ! { CHAR: P [ parse-picture ] }
+ ! { CHAR: Q [ parse-varbinary ] }
+ [ unsupported-field-type ]
+ } case ;
+
+: dbase3-memo ( n path -- data )
+ binary [
+ 512 * seek-absolute seek-input
+ B{ } [
+ 512 read
+ dup [ B{ 0 0x1a } member? ] find drop
+ [ head f ] [ t ] if* [ append ] dip
+ ] loop
+ ] with-file-reader ;
+
+LE-STRUCT: db4-memo-header
+ { reserved uint } ! B{ 0xff 0xff 0x08 0x08 }
+ { length uint } ;
+
+: dbase4-memo ( n path -- data )
+ binary [
+ 512 * seek-absolute seek-input
+ db4-memo-header read-struct length>> read
+ ] with-file-reader ;
+
+BE-STRUCT: vfp-file-header
+ { nextblock uint }
+ { reserved1 ushort }
+ { blocksize ushort }
+ { reserved2 uchar[504] } ;
+
+BE-STRUCT: vfp-memo-header
+ { type uint }
+ { length uint } ;
+
+CONSTANT: vfp-memo-types H{
+ { 0x0 "picture memo" }
+ { 0x1 "text memo" }
+ { 0x2 "object memo" }
+}
+
+: vfp-memo ( n path -- data )
+ binary [
+ vfp-file-header read-struct blocksize>> *
+ seek-absolute seek-input
+ vfp-memo-header read-struct length>> read
+ ] with-file-reader ;
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