/
TermInfoReader.cs
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/
TermInfoReader.cs
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//
// System.TermInfoReader
//
// Authors:
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
//
// (C) 2005 Novell, Inc (http://www.novell.com)
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if MONO_FEATURE_CONSOLE
using System.IO;
using System.Text;
namespace System {
// This class reads data from a byte array or file containing the terminfo capabilities
// information for any given terminal. The maximum allowed size is 4096 (or
// 32768 for terminfo2) bytes.
//
// Terminfo database files are divided in the following sections:
//
// Header
// Terminal names
// Boolean capabilities
// Numeric capabilities
// Offset of string capabilities
// String capabilities
//
// The header is as follows:
//
// Magic number (0x11A/0432 or 0x21e/01036 for terminfo2)
// Terminal names size
// Boolean section size
// Numeric section size
// String offsets section size
// Strings size
//
// After the header, there's a NUL terminated string containing terminal names separated
// by the character '|'. The last one is the terminal description.
//
// The boolean capabilities section has bytes that are set to 1 if the capability is supported
// and 0 otherwise. If the index of a capability is greater than the section size, 0 is assumed.
//
// The numeric capabilities section holds 2-byte integers (4-byte integers for terminfo2) in
// little endian format. No negative values are allowed and the absence of a capability is marked
// as two 0xFF (four 0xFF for terminfo2).
//
// The string offsets section contains 2-byte integer offsets into the string capabilies section.
// If the capability is not supported, the index will be two 0xFF bytes.
//
// The string capabilities section contains NUL terminated strings starting at the offsets found
// in the previous section.
//
// Terminal capabilities indexes are found in /usr/include/term.h file and described in
// 'man 5 terminfo'.
//
class TermInfoReader {
int boolSize;
int numSize;
int strOffsets;
//string [] names; // Last one is the description
byte [] buffer;
int booleansOffset;
//string term;
int intOffset;
public TermInfoReader (string term, string filename)
{
using (FileStream st = File.OpenRead (filename)) {
long length = st.Length;
if (length > 4096)
throw new Exception ("File must be smaller than 4K");
buffer = new byte [(int) length];
if (st.Read (buffer, 0, buffer.Length) != buffer.Length)
throw new Exception ("Short read");
ReadHeader (buffer, ref booleansOffset);
ReadNames (buffer, ref booleansOffset);
}
}
public TermInfoReader (string term, byte [] buffer)
{
if (buffer == null)
throw new ArgumentNullException ("buffer");
this.buffer = buffer;
ReadHeader (buffer, ref booleansOffset);
ReadNames (buffer, ref booleansOffset);
}
// public string Term {
// get { return term; }
// }
void DetermineVersion (short magic)
{
if (magic == 0x11a)
intOffset = 2;
else if (magic == 0x21e)
intOffset = 4;
else
throw new Exception (String.Format ("Magic number is unexpected: {0}", magic));
}
void ReadHeader (byte [] buffer, ref int position)
{
short magic = GetInt16 (buffer, position);
position += 2;
DetermineVersion (magic);
/*nameSize =*/ GetInt16 (buffer, position);
position += 2;
boolSize = GetInt16 (buffer, position);
position += 2;
numSize = GetInt16 (buffer, position);
position += 2;
strOffsets = GetInt16 (buffer, position);
position += 2;
/*strSize =*/ GetInt16 (buffer, position);
position += 2;
}
void ReadNames (byte [] buffer, ref int position)
{
string prev = GetString (buffer, position);
position += prev.Length + 1;
//names = prev.Split ('|');
}
public bool Get (TermInfoBooleans boolean)
{
int x = (int) boolean;
if (x < 0 || boolean >= TermInfoBooleans.Last || x >= boolSize)
return false;
int offset = booleansOffset;
offset += (int) boolean;
return (buffer [offset] != 0);
}
public int Get (TermInfoNumbers number)
{
int x = (int) number;
if (x < 0 || number >= TermInfoNumbers.Last || x > numSize)
return -1;
int offset = booleansOffset + boolSize;
if ((offset % 2) == 1)
offset++;
offset += ((int) number) * intOffset;
return GetInt16 (buffer, offset);
}
public string Get (TermInfoStrings tstr)
{
int x = (int) tstr;
if (x < 0 || tstr >= TermInfoStrings.Last || x > strOffsets)
return null;
int offset = booleansOffset + boolSize;
if ((offset % 2) == 1)
offset++;
offset += numSize * intOffset;
int off2 = GetInt16 (buffer, offset + (int) tstr * 2);
if (off2 == -1)
return null;
return GetString (buffer, offset + strOffsets * 2 + off2);
}
public byte [] GetStringBytes (TermInfoStrings tstr)
{
int x = (int) tstr;
if (x < 0 || tstr >= TermInfoStrings.Last || x > strOffsets)
return null;
int offset = booleansOffset + boolSize;
if ((offset % 2) == 1)
offset++;
offset += numSize * intOffset;
int off2 = GetInt16 (buffer, offset + (int) tstr * 2);
if (off2 == -1)
return null;
return GetStringBytes (buffer, offset + strOffsets * 2 + off2);
}
short GetInt16 (byte [] buffer, int offset)
{
int uno = (int) buffer [offset];
int dos = (int) buffer [offset + 1];
if (uno == 255 && dos == 255)
return -1;
return (short) (uno + dos * 256);
}
string GetString (byte [] buffer, int offset)
{
int length = 0;
int off = offset;
while (buffer [off++] != 0)
length++;
return Encoding.ASCII.GetString (buffer, offset, length);
}
byte [] GetStringBytes (byte [] buffer, int offset)
{
int length = 0;
int off = offset;
while (buffer [off++] != 0)
length++;
byte [] result = new byte [length];
Buffer.InternalBlockCopy (buffer, offset, result, 0, length);
return result;
}
internal static string Escape (string s)
{
StringBuilder sb = new StringBuilder ();
for (int i = 0; i < s.Length; i++) {
char current = s [i];
if (Char.IsControl (current)) {
sb.AppendFormat ("\\x{0:X2}", (int) current);
} else {
sb.Append (current);
}
}
return sb.ToString ();
}
}
}
#endif