//**********************************************************************
// nad_ctable_load()
//
// Load the data portion of a ctable formatted grid.
//**********************************************************************
public static bool nad_ctable_load(projCtx ctx, CTABLE ct, Stream fid)
{
try
{
fid.Seek(80 + 16 + 16 + 8 + 4, SeekOrigin.Begin); // 80+16+16+8+4 ?= sizeof(struct CTABLE)
// read all the actual shift values
int a_size = ct.lim.lam * ct.lim.phi;
ct.cvs = new LP[a_size];
BinaryReader br = new BinaryReader(fid);
for (int i = 0; i < a_size; i++)
{
ct.cvs[i].lam = br.ReadSingle();
ct.cvs[i].phi = br.ReadSingle();
}
}
catch
{
ct.cvs = null;
#if DEBUG
Console.Error.WriteLine("ctable loading failed on fread() - binary incompatible?");
#endif
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
return(true);
}
//**********************************************************************
// nad_init()
//
// Read a datum shift file in any of the supported binary formats.
//**********************************************************************
public static CTABLE nad_init(projCtx ctx, string name)
{
ctx.last_errno = 0;
// --------------------------------------------------------------------
// Open the file using the usual search rules.
// --------------------------------------------------------------------
Stream fid = Proj.pj_open_lib(ctx, name, FileAccess.Read);
if (fid == null)
{
return(null);
}
CTABLE ct = nad_ctable_init(ctx, fid);
if (ct != null)
{
if (!nad_ctable_load(ctx, ct, fid))
{
nad_free(ct);
ct = null;
}
}
fid.Close();
return(ct);
}
//**********************************************************************
// nad_free()
//
// Free a CTABLE grid shift structure produced by nad_init().
//**********************************************************************
public static void nad_free(CTABLE ct)
{
if (ct != null)
{
ct.cvs = null;
}
}
//**********************************************************************
// nad_ctable2_load()
//
// Load the data portion of a ctable2 formatted grid.
//**********************************************************************
public static bool nad_ctable2_load(projCtx ctx, CTABLE ct, Stream fid)
{
try
{
fid.Seek(160, SeekOrigin.Begin);
// read all the actual shift values
int a_size = ct.lim.lam * ct.lim.phi;
ct.cvs = new LP[a_size];
BinaryReader br = new BinaryReader(fid);
if (IS_LSB)
{
for (int i = 0; i < a_size; i++)
{
ct.cvs[i].lam = br.ReadSingle();
ct.cvs[i].phi = br.ReadSingle();
}
}
else
{
byte[] buf = br.ReadBytes(a_size * 8);
swap_words(buf, 0, 4, a_size * 2);
using (BinaryReader br2 = new BinaryReader(new MemoryStream(buf)))
{
for (int i = 0; i < a_size; i++)
{
ct.cvs[i].lam = br2.ReadSingle();
ct.cvs[i].phi = br2.ReadSingle();
}
}
}
return(true);
}
catch
{
ct.cvs = null;
#if DEBUG
Proj.pj_log(ctx, PJ_LOG.ERROR, "ctable2 loading failed on fread() - binary incompatible?");
#endif
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
}
//**********************************************************************
// nad_ctable_init()
//
// Read the header portion of a "ctable" format grid.
//**********************************************************************
public static CTABLE nad_ctable_init(projCtx ctx, Stream fid)
{
try
{
CTABLE ct = new CTABLE();
byte[] tmpID = new byte[80];
// read the table header
fid.Read(tmpID, 0, 80);
BinaryReader br = new BinaryReader(fid);
ct.ll.lam = br.ReadDouble();
ct.ll.phi = br.ReadDouble();
ct.del.lam = br.ReadDouble();
ct.del.phi = br.ReadDouble();
ct.lim.lam = br.ReadInt32();
ct.lim.phi = br.ReadInt32();
br.ReadInt32(); // FLP* cvs
// do some minimal validation to ensure the structure isn't corrupt
if (ct.lim.lam < 1 || ct.lim.lam > 100000 || ct.lim.phi < 1 || ct.lim.phi > 100000)
{
Proj.pj_ctx_set_errno(ctx, -38);
return(null);
}
ct.id = Encoding.ASCII.GetString(tmpID);
ct.id = ct.id.Trim(); // trim white space and newlines off id
ct.cvs = null;
return(ct);
}
catch
{
Proj.pj_ctx_set_errno(ctx, -38);
return(null);
}
}
//**********************************************************************
// nad_ctable2_init()
//
// Read the header portion of a "ctable2" format grid.
//**********************************************************************
public static CTABLE nad_ctable2_init(projCtx ctx, Stream fid)
{
try
{
CTABLE ct = new CTABLE();
byte[] header = new byte[160];
// read the table header
fid.Read(header, 0, 160);
if (!IS_LSB)
{
swap_words(header, 96, 8, 4);
swap_words(header, 128, 4, 2);
}
MemoryStream mem = new MemoryStream(header);
BinaryReader br = new BinaryReader(mem);
byte[] signature = new byte[16];
byte[] tmpID = new byte[80];
signature = br.ReadBytes(16);
string sig = Encoding.ASCII.GetString(signature);
if (sig.Substring(0, 9) != "CTABLE V2")
{
Proj.pj_log(ctx, PJ_LOG.ERROR, "ctable2 - wrong header!");
Proj.pj_ctx_set_errno(ctx, -38);
return(null);
}
// read the table header
tmpID = br.ReadBytes(80);
ct.ll.lam = br.ReadDouble();
ct.ll.phi = br.ReadDouble();
ct.del.lam = br.ReadDouble();
ct.del.phi = br.ReadDouble();
ct.lim.lam = br.ReadInt32();
ct.lim.phi = br.ReadInt32();
// do some minimal validation to ensure the structure isn't corrupt
if (ct.lim.lam < 1 || ct.lim.lam > 100000 || ct.lim.phi < 1 || ct.lim.phi > 100000)
{
Proj.pj_ctx_set_errno(ctx, -38);
return(null);
}
ct.id = Encoding.ASCII.GetString(tmpID);
ct.id = ct.id.Trim(); // trim white space and newlines off id
ct.cvs = null;
return(ct);
}
catch
{
Proj.pj_ctx_set_errno(ctx, -38);
return(null);
}
}
//**********************************************************************
// pj_gridinfo_init_gtx()
//
// Load a NOAA .gtx vertical datum shift file.
//**********************************************************************
static bool pj_gridinfo_init_gtx(projCtx ctx, FileStream fid, PJ_GRIDINFO gi)
{
byte[] header = new byte[40];
CTABLE ct;
double xorigin, yorigin, xstep, ystep;
int rows, columns;
// --------------------------------------------------------------------
// Read the header.
// --------------------------------------------------------------------
if (fid.Read(header, 0, 40) != 40)
{
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
// --------------------------------------------------------------------
// Regularize fields of interest and extract.
// --------------------------------------------------------------------
if (IS_LSB)
{
swap_words(header, 0, 8, 4);
swap_words(header, 32, 4, 2);
}
yorigin = BitConverter.ToDouble(header, 0);
xorigin = BitConverter.ToDouble(header, 8);
ystep = BitConverter.ToDouble(header, 16);
xstep = BitConverter.ToDouble(header, 24);
rows = BitConverter.ToInt32(header, 32);
columns = BitConverter.ToInt32(header, 36);
if (xorigin < -360 || xorigin > 360 ||
yorigin < -90 || yorigin > 90)
{
Console.WriteLine("gtx file header has invalid extents, corrupt?");
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
// --------------------------------------------------------------------
// Fill in CTABLE structure.
// --------------------------------------------------------------------
ct = new CTABLE();
ct.id = "GTX Vertical Grid Shift File";
ct.ll.lam = xorigin;
ct.ll.phi = yorigin;
ct.del.lam = xstep;
ct.del.phi = ystep;
ct.lim.lam = columns;
ct.lim.phi = rows;
// some GTX files come in 0-360 and we shift them back into the
// expected -180 to 180 range if possible. This does not solve
// problems with grids spanning the dateline.
if (ct.ll.lam >= 180.0)
{
ct.ll.lam -= 360.0;
}
#if !DEBUG
if (ct.ll.lam >= 0.0 && ct.ll.lam + ct.del.lam * ct.lim.lam > 180.0)
{
Console.Error.WriteLine("This GTX spans the dateline! This will cause problems.");
}
Console.Error.WriteLine("GTX {0}x{1}: LL=({2},{3}) UR=({4},{5})", ct.lim.lam, ct.lim.phi, ct.ll.lam, ct.ll.phi, ct.ll.lam + (columns - 1) * xstep, ct.ll.phi + (rows - 1) * ystep);
#endif
ct.ll.lam *= Proj.DEG_TO_RAD;
ct.ll.phi *= Proj.DEG_TO_RAD;
ct.del.lam *= Proj.DEG_TO_RAD;
ct.del.phi *= Proj.DEG_TO_RAD;
ct.cvs = null;
gi.ct = ct;
gi.grid_offset = 40;
gi.format = "gtx";
return(true);
}
//**********************************************************************
// pj_gridinfo_init()
//
// Open and parse header details from a datum gridshift file
// returning a list of PJ_GRIDINFOs for the grids in that
// file. This superceeds use of nad_init() for modern
// applications.
//**********************************************************************
public static PJ_GRIDINFO pj_gridinfo_init(projCtx ctx, string gridname)
{
Libc.errno = Proj.pj_errno = 0;
ctx.last_errno = 0;
// --------------------------------------------------------------------
// Initialize a GRIDINFO with stub info we would use if it
// cannot be loaded.
// --------------------------------------------------------------------
PJ_GRIDINFO gilist = new PJ_GRIDINFO();
gilist.gridname = gridname;
gilist.filename = null;
gilist.format = "missing";
gilist.grid_offset = 0;
gilist.ct = null;
gilist.next = null;
// --------------------------------------------------------------------
// Open the file using the usual search rules.
// --------------------------------------------------------------------
FileStream fp = Proj.pj_open_lib(ctx, gridname, FileAccess.Read);
if (fp == null)
{
Proj.pj_errno = Libc.errno;
ctx.last_errno = 0; // don't treat as a persistent error
return(gilist);
}
gilist.filename = gridname;
// --------------------------------------------------------------------
// Load a header, to determine the file type.
// --------------------------------------------------------------------
byte[] header = new byte[160];
try
{
if (fp.Read(header, 0, header.Length) != header.Length)
{
fp.Close();
header = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(gilist);
}
}
catch
{
fp.Close();
header = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(gilist);
}
fp.Seek(0, SeekOrigin.Begin);
// --------------------------------------------------------------------
// Determine file type.
// --------------------------------------------------------------------
if (Encoding.ASCII.GetString(header, 0, 6) == "HEADER" &&
Encoding.ASCII.GetString(header, 96, 6) == "W GRID" &&
Encoding.ASCII.GetString(header, 144, 16) == "TO NAD83 ")
{
pj_gridinfo_init_ntv1(ctx, fp, gilist);
}
else if (Encoding.ASCII.GetString(header, 0, 8) == "NUM_OREC" &&
Encoding.ASCII.GetString(header, 48, 7) == "GS_TYPE")
{
pj_gridinfo_init_ntv2(ctx, fp, gilist);
}
else if (gridname.Length > 4 && gridname.EndsWith("gtx", StringComparison.CurrentCultureIgnoreCase))
{
pj_gridinfo_init_gtx(ctx, fp, gilist);
}
else if (Encoding.ASCII.GetString(header, 0, 9) == "CTABLE V2")
{
CTABLE ct = nad_ctable2_init(ctx, fp);
gilist.format = "ctable2";
gilist.ct = ct;
Proj.pj_log(ctx, PJ_LOG.DEBUG_MAJOR, "Ctable2 {0} {1}x{2}: LL=({3},{4}) UR=({5},{6})",
ct.id, ct.lim.lam, ct.lim.phi, ct.ll.lam * Proj.RAD_TO_DEG, ct.ll.phi * Proj.RAD_TO_DEG,
(ct.ll.lam + (ct.lim.lam - 1) * ct.del.lam) * Proj.RAD_TO_DEG, (ct.ll.phi + (ct.lim.phi - 1) * ct.del.phi) * Proj.RAD_TO_DEG);
}
else
{
CTABLE ct = nad_ctable_init(ctx, fp);
if (ct == null)
{
Proj.pj_log(ctx, PJ_LOG.DEBUG_MAJOR, "CTABLE ct is NULL.");
}
else
{
gilist.format = "ctable";
gilist.ct = ct;
Proj.pj_log(ctx, PJ_LOG.DEBUG_MAJOR, "Ctable {0} {1}x{2}: LL=({3},{4}) UR=({5},{6})",
ct.id, ct.lim.lam, ct.lim.phi, ct.ll.lam * Proj.RAD_TO_DEG, ct.ll.phi * Proj.RAD_TO_DEG,
(ct.ll.lam + (ct.lim.lam - 1) * ct.del.lam) * Proj.RAD_TO_DEG, (ct.ll.phi + (ct.lim.phi - 1) * ct.del.phi) * Proj.RAD_TO_DEG);
}
}
fp.Close();
return(gilist);
}
//**********************************************************************
// pj_gridinfo_init_ntv2()
//
// Load a ntv2 (.gsb) file.
//**********************************************************************
static bool pj_gridinfo_init_ntv2(projCtx ctx, FileStream fid, PJ_GRIDINFO gilist)
{
byte[] header = new byte[11 * 16];
// --------------------------------------------------------------------
// Read the overview header.
// --------------------------------------------------------------------
try
{
if (fid.Read(header, 0, header.Length) != header.Length)
{
header = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
}
catch
{
header = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
// --------------------------------------------------------------------
// Byte swap interesting fields if needed.
// --------------------------------------------------------------------
if (!IS_LSB)
{
swap_words(header, 8, 4, 1);
swap_words(header, 8 + 16, 4, 1);
swap_words(header, 8 + 32, 4, 1);
swap_words(header, 8 + 7 * 16, 8, 1);
swap_words(header, 8 + 8 * 16, 8, 1);
swap_words(header, 8 + 9 * 16, 8, 1);
swap_words(header, 8 + 10 * 16, 8, 1);
}
// --------------------------------------------------------------------
// Get the subfile count out ... all we really use for now.
// --------------------------------------------------------------------
int num_subfiles = BitConverter.ToInt32(header, 8 + 32);
// ====================================================================
// Step through the subfiles, creating a PJ_GRIDINFO for each.
// ====================================================================
for (int subfile = 0; subfile < num_subfiles; subfile++)
{
// --------------------------------------------------------------------
// Read header.
// --------------------------------------------------------------------
try
{
if (fid.Read(header, 0, header.Length) != header.Length)
{
header = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
}
catch
{
header = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
if (Encoding.ASCII.GetString(header, 0, 8).StartsWith("SUB_NAME"))
{
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
// --------------------------------------------------------------------
// Byte swap interesting fields if needed.
// --------------------------------------------------------------------
if (!IS_LSB)
{
swap_words(header, 8 + 16 * 4, 8, 1);
swap_words(header, 8 + 16 * 5, 8, 1);
swap_words(header, 8 + 16 * 6, 8, 1);
swap_words(header, 8 + 16 * 7, 8, 1);
swap_words(header, +8 + 16 * 8, 8, 1);
swap_words(header, 8 + 16 * 9, 8, 1);
swap_words(header, 8 + 16 * 10, 4, 1);
}
// --------------------------------------------------------------------
// Initialize a corresponding "ct" structure.
// --------------------------------------------------------------------
CTABLE ct = new CTABLE();
ct.id = Encoding.ASCII.GetString(header, 8, 8);
ct.ll.lam = -BitConverter.ToDouble(header, 7 * 16 + 8); // W_LONG
ct.ll.phi = BitConverter.ToDouble(header, 4 * 16 + 8); // S_LAT
LP ur;
ur.lam = -BitConverter.ToDouble(header, 6 * 16 + 8); // E_LONG
ur.phi = BitConverter.ToDouble(header, 5 * 16 + 8); // N_LAT
ct.del.lam = BitConverter.ToDouble(header, 9 * 16 + 8);
ct.del.phi = BitConverter.ToDouble(header, 8 * 16 + 8);
ct.lim.lam = (int)(Math.Abs(ur.lam - ct.ll.lam) / ct.del.lam + 0.5) + 1;
ct.lim.phi = (int)(Math.Abs(ur.phi - ct.ll.phi) / ct.del.phi + 0.5) + 1;
#if DEBUG
Console.Error.WriteLine("NTv2 {0} {1}x{2}: LL=({3},{4}) UR=({5},{6})", ct.id,
ct.lim.lam, ct.lim.phi, ct.ll.lam / 3600.0, ct.ll.phi / 3600.0, ur.lam / 3600.0, ur.phi / 3600.0);
#endif
ct.ll.lam *= Proj.DEG_TO_RAD / 3600.0;
ct.ll.phi *= Proj.DEG_TO_RAD / 3600.0;
ct.del.lam *= Proj.DEG_TO_RAD / 3600.0;
ct.del.phi *= Proj.DEG_TO_RAD / 3600.0;
int gs_count = BitConverter.ToInt32(header, 8 + 16 * 10);
if (gs_count != ct.lim.lam * ct.lim.phi)
{
Console.Error.WriteLine("GS_COUNT({0}) does not match expected cells ({1}x{2}={3})",
gs_count, ct.lim.lam, ct.lim.phi, ct.lim.lam * ct.lim.phi);
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
ct.cvs = null;
PJ_GRIDINFO gi;
// --------------------------------------------------------------------
// Create a new gridinfo for this if we aren't processing the
// 1st subfile, and initialize our grid info.
// --------------------------------------------------------------------
if (subfile == 0)
{
gi = gilist;
}
else
{
gi = new PJ_GRIDINFO();
gi.gridname = gilist.gridname;
gi.filename = gilist.filename;
gi.next = null;
}
gi.ct = ct;
gi.format = "ntv2";
gi.grid_offset = fid.Position;
// --------------------------------------------------------------------
// Attach to the correct list or sublist.
// --------------------------------------------------------------------
if (Encoding.ASCII.GetString(header, 24, 4) == "NONE")
{
if (gi != gilist)
{
PJ_GRIDINFO lnk = gilist;
while (lnk.next != null)
{
lnk = lnk.next;
}
lnk.next = gi;
}
}
else
{
PJ_GRIDINFO gp = pj_gridinfo_parent(gilist, Encoding.ASCII.GetString(header, 24, 8));
if (gp == null)
{
#if DEBUG
Console.Error.WriteLine("pj_gridinfo_init_ntv2(): failed to find parent {0} for {1}.",
Encoding.ASCII.GetString(header, 24, 8), gi.ct.id);
#endif
PJ_GRIDINFO lnk = gilist;
while (lnk.next != null)
{
lnk = lnk.next;
}
lnk.next = gi;
}
else if (gp.child == null)
{
gp.child = gi;
}
else
{
PJ_GRIDINFO lnk = gp.child;
while (lnk.next != null)
{
lnk = lnk.next;
}
lnk.next = gi;
}
}
// --------------------------------------------------------------------
// Seek past the data.
// --------------------------------------------------------------------
fid.Seek(gs_count * 16, SeekOrigin.Current);
}
return(true);
}
//**********************************************************************
// pj_gridinfo_init_ntv1()
//
// Load an NTv1 style Canadian grid shift file.
//**********************************************************************
static bool pj_gridinfo_init_ntv1(projCtx ctx, FileStream fid, PJ_GRIDINFO gi)
{
byte[] header = new byte[176];
// --------------------------------------------------------------------
// Read the header.
// --------------------------------------------------------------------
try
{
if (fid.Read(header, 0, header.Length) != header.Length)
{
header = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
}
catch
{
header = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
// --------------------------------------------------------------------
// Regularize fields of interest.
// --------------------------------------------------------------------
if (IS_LSB)
{
swap_words(header, 8, 4, 1);
swap_words(header, 24, 8, 1);
swap_words(header, 40, 8, 1);
swap_words(header, 56, 8, 1);
swap_words(header, 72, 8, 1);
swap_words(header, 88, 8, 1);
swap_words(header, 104, 8, 1);
}
if (BitConverter.ToInt32(header, 8) != 12)
{
Console.Error.WriteLine("NTv1 grid shift file has wrong record count, corrupt?");
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
// --------------------------------------------------------------------
// Fill in CTABLE structure.
// --------------------------------------------------------------------
CTABLE ct = new CTABLE();
ct.id = "NTv1 Grid Shift File";
ct.ll.lam = -BitConverter.ToDouble(header, 72);
ct.ll.phi = BitConverter.ToDouble(header, 24);
LP ur;
ur.lam = -BitConverter.ToDouble(header, 56);
ur.phi = BitConverter.ToDouble(header, 40);
ct.del.lam = BitConverter.ToDouble(header, 104);
ct.del.phi = BitConverter.ToDouble(header, 88);
ct.lim.lam = (int)(Math.Abs(ur.lam - ct.ll.lam) / ct.del.lam + 0.5) + 1;
ct.lim.phi = (int)(Math.Abs(ur.phi - ct.ll.phi) / ct.del.phi + 0.5) + 1;
#if DEBUG
Console.Error.WriteLine("NTv1 {0}x{1}: LL=({2},{3}) UR=({4},{5})",
ct.lim.lam, ct.lim.phi, ct.ll.lam, ct.ll.phi, ur.lam, ur.phi);
#endif
ct.ll.lam *= Proj.DEG_TO_RAD;
ct.ll.phi *= Proj.DEG_TO_RAD;
ct.del.lam *= Proj.DEG_TO_RAD;
ct.del.phi *= Proj.DEG_TO_RAD;
ct.cvs = null;
gi.ct = ct;
gi.grid_offset = fid.Position;
gi.format = "ntv1";
return(true);
}
//**********************************************************************
// pj_gridinfo_load()
//
// This function is intended to implement delayed loading of
// the data contents of a grid file. The header and related
// stuff are loaded by pj_gridinfo_init().
//**********************************************************************
public static bool pj_gridinfo_load(projCtx ctx, PJ_GRIDINFO gi)
{
if (gi == null || gi.ct == null)
{
return(false);
}
lock (gridlock)
{
if (gi.ct.cvs != null)
{
return(true);
}
CTABLE ct_tmp = gi.ct.Clone();
// --------------------------------------------------------------------
// Original platform specific CTable format.
// --------------------------------------------------------------------
if (gi.format == "ctable")
{
FileStream fid = Proj.pj_open_lib(ctx, gi.filename, FileAccess.Read);
if (fid == null)
{
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
bool result = nad_ctable_load(ctx, ct_tmp, fid);
fid.Close();
gi.ct.cvs = ct_tmp.cvs;
return(result);
}
// --------------------------------------------------------------------
// CTable2 format.
// --------------------------------------------------------------------
else if (gi.format == "ctable2")
{
FileStream fid = Proj.pj_open_lib(ctx, gi.filename, FileAccess.Read);
if (fid == null)
{
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
bool result = nad_ctable2_load(ctx, ct_tmp, fid);
fid.Close();
gi.ct.cvs = ct_tmp.cvs;
return(result);
}
// --------------------------------------------------------------------
// NTv1 format.
// We process one line at a time. Note that the array storage
// direction (e-w) is different in the NTv1 file and what
// the CTABLE is supposed to have. The phi/lam are also
// reversed, and we have to be aware of byte swapping.
// --------------------------------------------------------------------
if (gi.format == "ntv1")
{
FileStream fid = Proj.pj_open_lib(ctx, gi.filename, FileAccess.Read);
if (fid == null)
{
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
fid.Seek(gi.grid_offset, SeekOrigin.Begin);
byte[] row_buf;
try
{
row_buf = new byte[gi.ct.lim.lam * 2 * sizeof(double)];
ct_tmp.cvs = new LP[gi.ct.lim.lam * gi.ct.lim.phi];
}
catch
{
row_buf = null;
ct_tmp.cvs = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
for (int row = 0; row < gi.ct.lim.phi; row++)
{
try
{
if (fid.Read(row_buf, 0, gi.ct.lim.lam * 2 * sizeof(double)) != gi.ct.lim.lam * 2 * sizeof(double))
{
row_buf = null;
ct_tmp.cvs = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
}
catch
{
row_buf = null;
ct_tmp.cvs = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
if (IS_LSB)
{
swap_words(row_buf, 8, gi.ct.lim.lam * 2);
}
// convert seconds to radians
int diff_seconds = 0;
for (int i = 0; i < gi.ct.lim.lam; i++)
{
int cvs = row * gi.ct.lim.lam + (gi.ct.lim.lam - i - 1);
ct_tmp.cvs[cvs].phi = BitConverter.ToDouble(row_buf, (diff_seconds++) * sizeof(double)) * ((Proj.PI / 180.0) / 3600.0);
ct_tmp.cvs[cvs].lam = BitConverter.ToDouble(row_buf, (diff_seconds++) * sizeof(double)) * ((Proj.PI / 180.0) / 3600.0);
}
}
row_buf = null;
fid.Close();
gi.ct.cvs = ct_tmp.cvs;
return(true);
}
// --------------------------------------------------------------------
// NTv2 format.
// We process one line at a time. Note that the array storage
// direction (e-w) is different in the NTv2 file and what
// the CTABLE is supposed to have. The phi/lam are also
// reversed, and we have to be aware of byte swapping.
// --------------------------------------------------------------------
if (gi.format == "ntv2")
{
#if DEBUG
Console.Error.WriteLine("NTv2 - loading grid " + gi.ct.id);
#endif
FileStream fid = Proj.pj_open_lib(ctx, gi.filename, FileAccess.Read);
if (fid == null)
{
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
fid.Seek(gi.grid_offset, SeekOrigin.Begin);
byte[] row_buf;
try
{
row_buf = new byte[gi.ct.lim.lam * 4 * sizeof(float)];
ct_tmp.cvs = new LP[gi.ct.lim.lam * gi.ct.lim.phi];
}
catch
{
row_buf = null;
ct_tmp.cvs = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
for (int row = 0; row < gi.ct.lim.phi; row++)
{
try
{
if (fid.Read(row_buf, 0, gi.ct.lim.lam * 4 * sizeof(float)) != gi.ct.lim.lam * 4 * sizeof(float))
{
row_buf = null;
ct_tmp.cvs = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
}
catch
{
row_buf = null;
ct_tmp.cvs = null;
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
if (!IS_LSB)
{
swap_words(row_buf, 4, gi.ct.lim.lam * 4);
}
// convert seconds to radians
int diff_seconds = 0;
for (int i = 0; i < gi.ct.lim.lam; i++)
{
int cvs = row * gi.ct.lim.lam + (gi.ct.lim.lam - i - 1);
ct_tmp.cvs[cvs].phi = BitConverter.ToSingle(row_buf, (diff_seconds++) * sizeof(float)) * ((Proj.PI / 180.0) / 3600.0);
ct_tmp.cvs[cvs].lam = BitConverter.ToSingle(row_buf, (diff_seconds++) * sizeof(float)) * ((Proj.PI / 180.0) / 3600.0);
diff_seconds += 2; // skip accuracy values
}
}
row_buf = null;
fid.Close();
gi.ct.cvs = ct_tmp.cvs;
return(true);
}
// --------------------------------------------------------------------
// GTX format.
// --------------------------------------------------------------------
if (gi.format == "gtx")
{
int words = gi.ct.lim.lam * gi.ct.lim.phi;
FileStream fid = Proj.pj_open_lib(ctx, gi.filename, FileAccess.Read);
if (fid == null)
{
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
fid.Seek(gi.grid_offset, SeekOrigin.Begin);
byte[] buf;
try
{
buf = new byte[words * sizeof(float)];
ct_tmp.cvs = new LP[words / 2];
}
catch
{
Proj.pj_ctx_set_errno(ctx, -38);
return(false);
}
try
{
if (fid.Read(buf, 0, words * sizeof(float)) != words * sizeof(float))
{
buf = null;
ct_tmp.cvs = null;
return(false);
}
}
catch
{
buf = null;
ct_tmp.cvs = null;
return(false);
}
if (IS_LSB)
{
swap_words(buf, 4, words);
}
for (int i = 0; i < words; i += 2)
{
ct_tmp.cvs[i / 2].phi = BitConverter.ToSingle(buf, i * sizeof(float));
ct_tmp.cvs[i / 2].lam = BitConverter.ToSingle(buf, (i + 1) * sizeof(float));
}
fid.Close();
gi.ct.cvs = ct_tmp.cvs;
return(true);
}
return(false);
} // lock(gridlock)
}
public static int pj_apply_vgridshift(PJ defn, string listname, ref PJ_GRIDINFO[] gridlist_p, ref int gridlist_count_p, bool inverse, int point_count, int point_offset, double[] x, double[] y, double[] z)
{
if (gridlist_p == null)
{
gridlist_p = pj_gridlist_from_nadgrids(Proj.pj_get_ctx(defn), Proj.pj_param_s(defn.ctx, defn.parameters, listname), out gridlist_count_p);
if (gridlist_p == null || gridlist_count_p == 0)
{
return(defn.ctx.last_errno);
}
}
if (gridlist_p == null || gridlist_count_p == 0)
{
Proj.pj_ctx_set_errno(defn.ctx, -38);
return(-38);
}
PJ_GRIDINFO[] tables = gridlist_p;
defn.ctx.last_errno = 0;
for (int i = 0; i < point_count; i++)
{
int io = i * point_offset;
double value = Libc.HUGE_VAL;
LP input;
input.phi = y[io];
input.lam = x[io];
// keep trying till we find a table that works
for (int itable = 0; itable < gridlist_count_p; itable++)
{
PJ_GRIDINFO gi = tables[itable];
CTABLE ct = gi.ct;
double grid_x, grid_y;
int grid_ix, grid_iy;
// skip tables that don't match our point at all.
if (ct.ll.phi > input.phi || ct.ll.lam > input.lam || ct.ll.phi + (ct.lim.phi - 1) * ct.del.phi < input.phi || ct.ll.lam + (ct.lim.lam - 1) * ct.del.lam < input.lam)
{
continue;
}
// If we have child nodes, check to see if any of them apply.
while (gi.child != null)
{
PJ_GRIDINFO child = gi.child;
for (; child != null; child = child.next)
{
CTABLE ct1 = child.ct;
if (ct1.ll.phi > input.phi || ct1.ll.lam > input.lam || ct1.ll.phi + (ct1.lim.phi - 1) * ct1.del.phi < input.phi || ct1.ll.lam + (ct1.lim.lam - 1) * ct1.del.lam < input.lam)
{
continue;
}
break;
}
// If we didn't find a child then nothing more to do,
if (child == null)
{
break;
}
// otherwise use the child, first checking it's children.
gi = child;
ct = child.ct;
}
// load the grid shift info if we don't have it.
if (ct.cvs == null && !pj_gridinfo_load(Proj.pj_get_ctx(defn), gi))
{
Proj.pj_ctx_set_errno(defn.ctx, -38);
return(-38);
}
// Interpolation a location within the grid
grid_x = (input.lam - ct.ll.lam) / ct.del.lam;
grid_y = (input.phi - ct.ll.phi) / ct.del.phi;
grid_ix = (int)Math.Floor(grid_x);
grid_iy = (int)Math.Floor(grid_y);
grid_x -= grid_ix;
grid_y -= grid_iy;
LP cvs1 = ct.cvs[(grid_ix + grid_iy * ct.lim.lam) / 2];
LP cvs2 = ct.cvs[(grid_ix + (grid_iy + 1) * ct.lim.lam) / 2];
value = cvs1.lam * (1.0 - grid_x) * (1.0 - grid_y) + cvs1.phi * grid_x * (1.0 - grid_y) +
cvs2.lam * (1.0 - grid_x) * grid_y + cvs2.phi * grid_x * grid_y;
if (Math.Abs(value + 88.8888) < 0.0001)
{
value = Libc.HUGE_VAL; // nodata?
}
else
{
if (inverse)
{
z[io] -= value;
}
else
{
z[io] += value;
}
}
if (value != Libc.HUGE_VAL)
{
if (debug_count_apply_vgridshift++ < 20)
{
Proj.pj_log(defn.ctx, PJ_LOG.DEBUG_MINOR, "pj_apply_gridshift(): used {0}", ct.id);
}
break;
}
}
if (value == Libc.HUGE_VAL)
{
Proj.pj_log(defn.ctx, PJ_LOG.DEBUG_MAJOR, "pj_apply_vgridshift(): failed to find a grid shift table for\n\t\t\tlocation ({0}dW,{1}dN)", x[io] * Proj.RAD_TO_DEG, y[io] * Proj.RAD_TO_DEG);
StringBuilder gridlist = new StringBuilder();
for (int itable = 0; itable < gridlist_count_p; itable++)
{
PJ_GRIDINFO gi = tables[itable];
if (itable == 0)
{
gridlist.AppendFormat(" tried: {0}", gi.gridname);
}
else
{
gridlist.AppendFormat(",{0}", gi.gridname);
}
}
Proj.pj_log(defn.ctx, PJ_LOG.DEBUG_MAJOR, "{0}", gridlist.ToString());
Proj.pj_ctx_set_errno(defn.ctx, (int)PJD_ERR.GRID_AREA);
return((int)PJD_ERR.GRID_AREA);
}
}
return(0);
}
// Determine nad table correction value
public static LP nad_intr(LP t, CTABLE ct)
{
LP val, frct;
ILP indx;
double m00, m10, m01, m11;
int f00, f10, f01, f11;
int index;
int @in;
t.lam /= ct.del.lam;
t.phi /= ct.del.phi;
indx.lam = (int)Math.Floor(t.lam);
indx.phi = (int)Math.Floor(t.phi);
frct.lam = t.lam - indx.lam;
frct.phi = t.phi - indx.phi;
val.lam = val.phi = Libc.HUGE_VAL;
if (indx.lam < 0)
{
if (indx.lam == -1 && frct.lam > 0.99999999999)
{
indx.lam++;
frct.lam = 0.0;
}
else
{
return(val);
}
}
else
{
@in = indx.lam + 1;
if (@in >= ct.lim.lam)
{
if (@in == ct.lim.lam && frct.lam < 1e-11)
{
indx.lam--;
frct.lam = 1.0;
}
else
{
return(val);
}
}
}
if (indx.phi < 0)
{
if (indx.phi == -1 && frct.phi > 0.99999999999)
{
indx.phi++;
frct.phi = 0.0;
}
else
{
return(val);
}
}
else
{
@in = indx.phi + 1;
if (@in >= ct.lim.phi)
{
if (@in == ct.lim.phi && frct.phi < 1e-11)
{
indx.phi--;
frct.phi = 1.0;
}
else
{
return(val);
}
}
}
index = indx.phi * ct.lim.lam + indx.lam;
f00 = index++;
f10 = index;
index += ct.lim.lam;
f11 = index--;
f01 = index;
m11 = m10 = frct.lam;
m00 = m01 = 1.0 - frct.lam;
m11 *= frct.phi;
m01 *= frct.phi;
frct.phi = 1.0 - frct.phi;
m00 *= frct.phi;
m10 *= frct.phi;
val.lam = m00 * ct.cvs[f00].lam + m10 * ct.cvs[f10].lam + m01 * ct.cvs[f01].lam + m11 * ct.cvs[f11].lam;
val.phi = m00 * ct.cvs[f00].phi + m10 * ct.cvs[f10].phi + m01 * ct.cvs[f01].phi + m11 * ct.cvs[f11].phi;
return(val);
}
static int debug_count_apply_gridshift_3 = 0; // TODO
public static int pj_apply_gridshift_3(projCtx ctx, PJ_GRIDINFO[] tables, int grid_count, bool inverse, int point_count, int point_offset, double[] x, double[] y, double[] z)
{
if (tables == null || grid_count == 0)
{
Proj.pj_ctx_set_errno(ctx, -38);
return(-38);
}
ctx.last_errno = 0;
for (int i = 0; i < point_count; i++)
{
long io = i * point_offset;
LP input, output;
int itable;
input.phi = y[io];
input.lam = x[io];
output.phi = Libc.HUGE_VAL;
output.lam = Libc.HUGE_VAL;
// keep trying till we find a table that works
for (itable = 0; itable < grid_count; itable++)
{
PJ_GRIDINFO gi = tables[itable];
CTABLE ct = gi.ct;
double epsilon = (Math.Abs(ct.del.phi) + Math.Abs(ct.del.lam)) / 10000.0;
// skip tables that don't match our point at all.
if (ct.ll.phi - epsilon > input.phi ||
ct.ll.lam - epsilon > input.lam ||
ct.ll.phi + (ct.lim.phi - 1) * ct.del.phi + epsilon < input.phi ||
ct.ll.lam + (ct.lim.lam - 1) * ct.del.lam + epsilon < input.lam)
{
continue;
}
// If we have child nodes, check to see if any of them apply.
while (gi.child != null)
{
PJ_GRIDINFO child = gi.child;
for (; child != null; child = child.next)
{
CTABLE ct1 = child.ct;
if (ct1.ll.phi - epsilon > input.phi ||
ct1.ll.lam - epsilon > input.lam ||
ct1.ll.phi + (ct1.lim.phi - 1) * ct1.del.phi + epsilon < input.phi ||
ct1.ll.lam + (ct1.lim.lam - 1) * ct1.del.lam + epsilon < input.lam)
{
continue;
}
break;
}
// If we didn't find a child then nothing more to do,
if (child == null)
{
break;
}
// otherwise use the child, first checking it's children.
gi = child;
ct = child.ct;
}
// load the grid shift info if we don't have it.
if (ct.cvs == null && !pj_gridinfo_load(ctx, gi))
{
Proj.pj_ctx_set_errno(ctx, -38);
return(-38);
}
output = nad_cvt(input, inverse, ct);
if (output.lam != Libc.HUGE_VAL)
{
if (debug_count_apply_gridshift_3++ < 20)
{
Proj.pj_log(ctx, PJ_LOG.DEBUG_MINOR, "pj_apply_gridshift(): used {0}", ct.id);
}
break;
}
}
if (output.lam == Libc.HUGE_VAL)
{
if (ctx.debug_level >= PJ_LOG.DEBUG_MAJOR)
{
Proj.pj_log(ctx, PJ_LOG.DEBUG_MAJOR, "pj_apply_gridshift(): failed to find a grid shift table for\n\t\t\tlocation ({0}dW,{1}dN)", x[io] * Proj.RAD_TO_DEG, y[io] * Proj.RAD_TO_DEG);
for (itable = 0; itable < grid_count; itable++)
{
PJ_GRIDINFO gi = tables[itable];
if (itable == 0)
{
Proj.pj_log(ctx, PJ_LOG.DEBUG_MAJOR, " tried: {0}", gi.gridname);
}
else
{
Proj.pj_log(ctx, PJ_LOG.DEBUG_MAJOR, ",{0}", gi.gridname);
}
}
}
// We don't actually have any machinery currently to set the
// following macro, so this is mostly kept here to make it clear
// how we ought to operate if we wanted to make it super clear
// that an error has occured when points are outside our available
// datum shift areas. But if this is on, we will find that "low
// value" points on the fringes of some datasets will completely
// fail causing lots of problems when it is more or less ok to
// just not apply a datum shift. So rather than deal with
// that we just fallback to no shift. (see also bug #45).
#if ERR_GRID_AREA_TRANSIENT_SEVERE
y[io] = Libc.HUGE_VAL;
x[io] = Libc.HUGE_VAL;
#else
// leave x/y unshifted.
#endif
}
else
{
y[io] = output.phi;
x[io] = output.lam;
}
}
return(0);
}
public static LP nad_cvt(LP @in, bool inverse, CTABLE ct)
{
const int MAX_TRY = 9;
if (@in.lam == Libc.HUGE_VAL)
{
return(@in);
}
// normalize input to ll origin
LP tb = @in;
tb.lam -= ct.ll.lam;
tb.phi -= ct.ll.phi;
tb.lam = Proj.adjlon(tb.lam - Proj.PI) + Proj.PI;
LP t = nad_intr(tb, ct);
if (inverse)
{
LP del, dif;
int i = MAX_TRY;
if (t.lam == Libc.HUGE_VAL)
{
return(t);
}
t.lam = tb.lam + t.lam;
t.phi = tb.phi - t.phi;
do
{
del = nad_intr(t, ct);
// This case used to return failure, but I have
// changed it to return the first order approximation
// of the inverse shift. This avoids cases where the
// grid shift *into* this grid came from another grid.
// While we aren't returning optimally correct results
// I feel a close result in this case is better than
// no result. NFW
// To demonstrate use -112.5839956 49.4914451 against
// the NTv2 grid shift file from Canada.
if (del.lam == Libc.HUGE_VAL)
{
#if DEBUG
Console.Error.WriteLine("Inverse grid shift iteration failed, presumably at grid edge.\nUsing first approximation.");
#endif
break;
}
t.lam -= dif.lam = t.lam - del.lam - tb.lam;
t.phi -= dif.phi = t.phi + del.phi - tb.phi;
} while((i--) != 0 && Math.Abs(dif.lam) > TOL12 && Math.Abs(dif.phi) > TOL12);
if (i < 0)
{
#if DEBUG
Console.Error.WriteLine("Inverse grid shift iterator failed to converge.");
#endif
t.lam = t.phi = Libc.HUGE_VAL;
return(t);
}
@in.lam = Proj.adjlon(t.lam + ct.ll.lam);
@in.phi = t.phi + ct.ll.phi;
}
else
{
if (t.lam == Libc.HUGE_VAL)
{
@in = t;
}
else
{
@in.lam -= t.lam;
@in.phi += t.phi;
}
}
return(@in);
}
