ref: a411870ee4640241e3c494367d922847da84f972
dir: purgatorio/appl/lib/palm.b
implement Palm;
#
# Copyright © 2001-2003 Vita Nuova Holdings Limited. All rights reserved.
#
# Based on ``Palm® File Format Specification'', Document Number 3008-004, 1 May 2001, by Palm Inc.
# Doc compression based on description by Paul Lucas, 18 August 1998
#
include "sys.m";
sys: Sys;
include "daytime.m";
daytime: Daytime;
include "palm.m";
# Exact value of "Jan 1, 1970 0:00:00 GMT" - "Jan 1, 1904 0:00:00 GMT"
Epochdelta: con 2082844800;
tzoff := 0;
init(): string
{
sys = load Sys Sys->PATH;
daytime = load Daytime Daytime->PATH;
if(daytime == nil)
return "can't load required module";
tzoff = daytime->local(0).tzoff;
return nil;
}
Record.new(id: int, attr: int, cat: int, size: int): ref Record
{
return ref Record(id, attr, cat, array[size] of byte);
}
Resource.new(name: int, id: int, size: int): ref Resource
{
return ref Resource(name, id, array[size] of byte);
}
Doc.open(m: Palmdb, file: ref Palmdb->PDB): (ref Doc, string)
{
info := m->file.db.stat();
if(info.dtype != "TEXt" || info.creator != "REAd")
return (nil, "not a Doc file: wrong type or creator");
r := m->file.read(0);
if(r == nil)
return (nil, sys->sprint("not a valid Doc file: %r"));
a := r.data;
if(len a < 16)
return (nil, sys->sprint("not a valid Doc file: bad length: %d", len a));
maxrec := m->file.db.nentries()-1;
d := ref Doc;
d.m = m;
d.file = file;
d.version = get2(a);
err := "unknown";
if(d.version != 1 && d.version != 2)
err = "unknown Docfile version";
# a[2:] is spare
d.length = get4(a[4:]);
d.nrec = get2(a[8:]);
if(maxrec >= 0 && d.nrec > maxrec){
d.nrec = maxrec;
err = "invalid record count";
}
d.recsize = get2(a[10:]);
d.position = get4(a[12:]);
return (d, sys->sprint("unexpected Doc file format: %s", err));
}
Doc.iscompressed(d: self ref Doc): int
{
return (d.version&7) == 2; # high-order bits are sometimes used, ignore them
}
Doc.read(doc: self ref Doc, index: int): (string, string)
{
m := doc.m;
DB, PDB: import m;
r := doc.file.read(index+1);
if(r == nil)
return (nil, sys->sprint("%r"));
(s, serr) := doc.unpacktext(r.data);
if(s == nil)
return (nil, serr);
return (s, nil);
}
Doc.unpacktext(doc: self ref Doc, a: array of byte): (string, string)
{
nb := len a;
s: string;
if(!doc.iscompressed()){
for(i := 0; i < nb; i++)
s[len s] = int a[i]; # assumes Latin-1
return (s, nil);
}
o := 0;
for(i := 0; i < nb;){
c := int a[i++];
if(c >= 9 && c <= 16r7F || c == 0)
s[o++] = c;
else if(c >= 1 && c <= 8){
if(i+c > nb)
return (nil, "missing data in record");
while(--c >= 0)
s[o++] = int a[i++];
}else if(c >= 16rC0 && c <= 16rFF){
s[o] = ' ';
s[o+1] = c & 16r7F;
o += 2;
}else{ # c >= 0x80 && c <= 16rBF
v := int a[i++];
m := ((c & 16r3F)<<5)|(v>>3);
n := (v&7) + 3;
if(m == 0 || m > o)
return (nil, sys->sprint("data is corrupt: m=%d n=%d o=%d", m, n, o));
for(; --n >= 0; o++)
s[o] = s[o-m];
}
}
return (s, nil);
}
Doc.textlength(doc: self ref Doc, a: array of byte): int
{
nb := len a;
if(!doc.iscompressed())
return nb;
o := 0;
for(i := 0; i < nb;){
c := int a[i++];
if(c >= 9 && c <= 16r7F || c == 0)
o++;
else if(c >= 1 && c <= 8){
if(i+c > nb)
return -1;
o += c;
i += c;
}else if(c >= 16rC0 && c <= 16rFF){
o += 2;
}else{ # c >= 0x80 && c <= 16rBF
v := int a[i++];
m := ((c & 16r3F)<<5)|(v>>3);
n := (v&7) + 3;
if(m == 0 || m > o)
return -1;
o += n;
}
}
return o;
}
id2s(i: int): string
{
if(i == 0)
return "";
return sys->sprint("%c%c%c%c", (i>>24)&16rFF, (i>>16)&16rFF, (i>>8)&16rFF, i&16rFF);
}
s2id(s: string): int
{
n := 0;
for(i := 0; i < 4; i++){
c := 0;
if(i < len s)
c = s[i] & 16rFF;
n = (n<<8) | c;
}
return n;
}
DBInfo.new(name: string, attr: int, dtype: string, version: int, creator: string): ref DBInfo
{
info := ref DBInfo;
info.name = name;
info.attr = attr;
info.version = version;
info.ctime = daytime->now();
info.mtime = daytime->now();
info.btime = 0;
info.modno = 0;
info.dtype = dtype;
info.creator = creator;
info.uidseed = 0;
info.index = 0;
return info;
}
Categories.new(labels: array of string): ref Categories
{
c := ref Categories;
c.renamed = 0;
c.lastuid = 0;
c.labels = array[16] of string;
c.uids = array[] of {0 to 15 => 0};
for(i := 0; i < len labels && i < 16; i++){
c.labels[i] = labels[i];
c.lastuid = 16r80 + i;
c.uids[i] = c.lastuid;
}
return c;
}
Categories.unpack(a: array of byte): ref Categories
{
if(len a < 16r114)
return nil; # doesn't match the structure
c := ref Categories;
c.renamed = get2(a);
c.labels = array[16] of string;
c.uids = array[16] of int;
j := 2;
for(i := 0; i < 16; i++){
c.labels[i] = latin1(a[j:j+16], 0);
j += 16;
c.uids[i] = int a[16r102+i];
}
c.lastuid = int a[16r112];
# one byte of padding is shown on p. 26, but
# two more are invariably used in practice
# before application specific data.
if(len a > 16r116)
c.appdata = a[16r116:];
return c;
}
Categories.pack(c: self ref Categories): array of byte
{
a := array[16r116 + len c.appdata] of byte;
put2(a, c.renamed);
j := 2;
for(i := 0; i < 16; i++){
puts(a[j:j+16], c.labels[i]);
j += 16;
a[16r102+i] = byte c.uids[i];
}
a[16r112] = byte c.lastuid;
a[16r113] = byte 0; # pad shown on p. 26
a[16r114] = byte 0; # extra two bytes of padding used in practice
a[16r115] = byte 0;
if(c.appdata != nil)
a[16r116:] = c.appdata;
return a;
}
Categories.mkidmap(c: self ref Categories): array of int
{
a := array[256] of {* => 0};
for(i := 0; i < len c.uids; i++)
a[c.uids[i]] = i;
return a;
}
#
# because PalmOS treats all times as local times, and doesn't associate
# them with time zones, we'll convert using local time on Plan 9 and Inferno
#
pilot2epoch(t: int): int
{
if(t == 0)
return 0; # we'll assume it's not set
return t - Epochdelta + tzoff;
}
epoch2pilot(t: int): int
{
if(t == 0)
return t;
return t - tzoff + Epochdelta;
}
#
# map Palm name to string, assuming iso-8859-1,
# but remap space and /
#
latin1(a: array of byte, remap: int): string
{
s := "";
for(i := 0; i < len a; i++){
c := int a[i];
if(c == 0)
break;
if(remap){
if(c == ' ')
c = 16r00A0; # unpaddable space
else if(c == '/')
c = 16r2215; # division /
}
s[len s] = c;
}
return s;
}
#
# map from Unicode to Palm name
#
filename(name: string): string
{
s := "";
for(i := 0; i < len name; i++){
c := name[i];
if(c == ' ')
c = 16r00A0; # unpaddable space
else if(c == '/')
c = 16r2215; # division solidus
s[len s] = c;
}
return s;
}
dbname(name: string): string
{
s := "";
for(i := 0; i < len name; i++){
c := name[i];
case c {
0 => c = ' '; # unlikely, but just in case
16r2215 => c = '/';
16r00A0 => c = ' ';
}
s[len s] = c;
}
return s;
}
#
# string conversion: can't use (string a) because
# the bytes are Latin1, not Unicode
#
gets(a: array of byte): string
{
s := "";
for(i := 0; i < len a; i++)
s[len s] = int a[i];
return s;
}
puts(a: array of byte, s: string)
{
for(i := 0; i < len a-1 && i < len s; i++)
a[i] = byte s[i];
for(; i < len a; i++)
a[i] = byte 0;
}
#
# big-endian packing
#
get4(p: array of byte): int
{
return (((((int p[0] << 8) | int p[1]) << 8) | int p[2]) << 8) | int p[3];
}
get3(p: array of byte): int
{
return (((int p[0] << 8) | int p[1]) << 8) | int p[2];
}
get2(p: array of byte): int
{
return (int p[0]<<8) | int p[1];
}
put4(p: array of byte, v: int)
{
p[0] = byte (v>>24);
p[1] = byte (v>>16);
p[2] = byte (v>>8);
p[3] = byte (v & 16rFF);
}
put3(p: array of byte, v: int)
{
p[0] = byte (v>>16);
p[1] = byte (v>>8);
p[2] = byte (v & 16rFF);
}
put2(p: array of byte, v: int)
{
p[0] = byte (v>>8);
p[1] = byte (v & 16rFF);
}
#
# DL protocol argument wrapping, based on conventions
# extracted from include/Core/System/DLCommon.h in SDK 5
#
# tiny arguments
# id: byte
# size: byte # excluding this header
# data: byte[]
#
# small arguments
# id: byte # with 16r80 flag
# pad: byte
# size: byte[2]
# data: byte[]
#
# long arguments
# id: byte # with 16r40 flag
# pad: byte
# size: byte[4]
# data: byte[]
# wrapper format flag in request/response argument ID
ShortWrap: con 16r80; # 2-byte count
LongWrap: con 16r40; # 4-byte count
Eshort: con "response shorter than expected";
#
# set the system error string
#
e(s: string): string
{
if(s != nil)
sys->werrstr(s);
return s;
}
argsize(args: array of (int, array of byte)): int
{
totnb := 0;
for(i := 0; i < len args; i++){
(nil, a) := args[i];
n := len a;
if(n > 65535)
totnb += 6; # long wrap
else if(n > 255)
totnb += 4; # short
else
totnb += 2; # tiny
totnb += n;
}
return totnb;
}
packargs(out: array of byte, args: array of (int, array of byte)): array of byte
{
for(i := 0; i < len args; i++){
(id, a) := args[i];
n := len a;
if(n > 65535){
out[0] = byte (LongWrap|ShortWrap|id);
out[1] = byte 0;
put4(out[2:], n);
out = out[6:];
}else if(n > 255){
out[0] = byte (ShortWrap|id);
out[1] = byte 0;
put2(out[2:], n);
out = out[4:];
}else{
out[0] = byte id;
out[1] = byte n;
out = out[2:];
}
out[0:] = a;
out = out[n:];
}
return out;
}
unpackargs(argc: int, reply: array of byte): (array of (int, array of byte), string)
{
replies := array[argc] of (int, array of byte);
o := 0;
for(i := 0; i < len replies; i++){
o = (o+1)&~1; # each argument starts at even offset
a := reply[o:];
if(len a < 2)
return (nil, e(Eshort));
rid := int a[0];
l: int;
if(rid & LongWrap){
if(len a < 6)
return (nil, e(Eshort));
l = get4(a[2:]);
a = a[6:];
o += 6;
}else if(rid & ShortWrap){
if(len a < 4)
return (nil, e(Eshort));
l = get2(a[2:]);
a = a[4:];
o += 4;
}else{
l = int a[1];
a = a[2:];
o += 2;
}
if(len a < l)
return (nil, e(Eshort));
replies[i] = (rid &~ 16rC0, a[0:l]);
o += l;
}
return (replies, nil);
}