raze-gles/polymer/eduke32/source/lunatic/fs.lua

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-- Virtual file system facilities for Lunatic
local ffi = require("ffi")
local C = ffi.C
local decl = require("lprivate").decl
local assert = assert
local error = error
local type = type
----------
decl[[
int32_t pathsearchmode;
typedef struct _CACHE1D_FIND_REC {
char *name;
int32_t type, source;
struct _CACHE1D_FIND_REC *next, *prev, *usera, *userb;
} CACHE1D_FIND_REC;
void klistfree(CACHE1D_FIND_REC *rec);
CACHE1D_FIND_REC *klistpath(const char *path, const char *mask, int32_t type);
]]
-- The API table
local fs = {}
local CACHE1D = ffi.new[[
struct {
static const int FIND_FILE = 1;
static const int FIND_DIR = 2;
static const int FIND_DRIVE = 4;
static const int FIND_NOCURDIR = 8;
static const int OPT_NOSTACK = 0x100;
// the lower the number, the higher the priority
static const int SOURCE_DRIVE = 0;
static const int SOURCE_CURDIR = 1;
static const int SOURCE_PATH = 2; // + path stack depth
static const int SOURCE_ZIP = 0x7ffffffe;
static const int SOURCE_GRP = 0x7fffffff;
}
]]
-- files = fs.listpath(path, mask)
-- TODO: filter by 'source' (path, zip and/or grp)
-- TODO: directories too, so that one can list them recursively, for example
function fs.listpath(path, mask)
if (type(path)~="string") then
-- TODO: maybe also allow nil
error("Invalid argument #1: must be a string", 2)
end
if (type(mask) ~= "string") then
error("Invalid argument #2: must be a string", 2)
end
-- Normalization, for portability's sake
if (path:find("\\")) then
error("Invalid argument #1: must not contain backslashes", 2)
end
if (mask:find("[\\/]")) then
error("Invalid argument #2: must not contain back or forward slashes", 2)
end
local opsm = C.pathsearchmode
C.pathsearchmode = 0
local rootrec = C.klistpath(path, mask, CACHE1D.FIND_FILE + CACHE1D.FIND_NOCURDIR)
C.pathsearchmode = opsm
if (rootrec == nil) then
-- XXX: may have failed hard or just no matching files
return {}
end
local files = {}
local rec = rootrec
while (rec ~= nil) do
assert(rec.name ~= nil)
files[#files+1] = ffi.string(rec.name)
rec = rec.next
end
C.klistfree(rootrec)
return files
end
return fs