/* Conversion between ISO 8859-1 and IBM037.

   This module uses the Z900 variant of the Translate One To One
   instruction.
   Copyright (C) 1997-2014 Free Software Foundation, Inc.

   Author: Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
   Based on the work by Ulrich Drepper  <drepper@cygnus.com>, 1997.

   Thanks to Daniel Appich who covered the relevant performance work
   in his diploma thesis.

   This is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   This is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <dlfcn.h>
#include <stdint.h>

// conversion table from ISO-8859-1 to IBM037
static const unsigned char table_iso8859_1_to_cp037[256]
__attribute__ ((aligned (8))) =
{
  [0x00] = 0x00, [0x01] = 0x01, [0x02] = 0x02, [0x03] = 0x03,
  [0x04] = 0x37, [0x05] = 0x2D, [0x06] = 0x2E, [0x07] = 0x2F,
  [0x08] = 0x16, [0x09] = 0x05, [0x0A] = 0x25, [0x0B] = 0x0B,
  [0x0C] = 0x0C, [0x0D] = 0x0D, [0x0E] = 0x0E, [0x0F] = 0x0F,
  [0x10] = 0x10, [0x11] = 0x11, [0x12] = 0x12, [0x13] = 0x13,
  [0x14] = 0x3C, [0x15] = 0x3D, [0x16] = 0x32, [0x17] = 0x26,
  [0x18] = 0x18, [0x19] = 0x19, [0x1A] = 0x3F, [0x1B] = 0x27,
  [0x1C] = 0x1C, [0x1D] = 0x1D, [0x1E] = 0x1E, [0x1F] = 0x1F,
  [0x20] = 0x40, [0x21] = 0x5A, [0x22] = 0x7F, [0x23] = 0x7B,
  [0x24] = 0x5B, [0x25] = 0x6C, [0x26] = 0x50, [0x27] = 0x7D,
  [0x28] = 0x4D, [0x29] = 0x5D, [0x2A] = 0x5C, [0x2B] = 0x4E,
  [0x2C] = 0x6B, [0x2D] = 0x60, [0x2E] = 0x4B, [0x2F] = 0x61,
  [0x30] = 0xF0, [0x31] = 0xF1, [0x32] = 0xF2, [0x33] = 0xF3,
  [0x34] = 0xF4, [0x35] = 0xF5, [0x36] = 0xF6, [0x37] = 0xF7,
  [0x38] = 0xF8, [0x39] = 0xF9, [0x3A] = 0x7A, [0x3B] = 0x5E,
  [0x3C] = 0x4C, [0x3D] = 0x7E, [0x3E] = 0x6E, [0x3F] = 0x6F,
  [0x40] = 0x7C, [0x41] = 0xC1, [0x42] = 0xC2, [0x43] = 0xC3,
  [0x44] = 0xC4, [0x45] = 0xC5, [0x46] = 0xC6, [0x47] = 0xC7,
  [0x48] = 0xC8, [0x49] = 0xC9, [0x4A] = 0xD1, [0x4B] = 0xD2,
  [0x4C] = 0xD3, [0x4D] = 0xD4, [0x4E] = 0xD5, [0x4F] = 0xD6,
  [0x50] = 0xD7, [0x51] = 0xD8, [0x52] = 0xD9, [0x53] = 0xE2,
  [0x54] = 0xE3, [0x55] = 0xE4, [0x56] = 0xE5, [0x57] = 0xE6,
  [0x58] = 0xE7, [0x59] = 0xE8, [0x5A] = 0xE9, [0x5B] = 0xBA,
  [0x5C] = 0xE0, [0x5D] = 0xBB, [0x5E] = 0xB0, [0x5F] = 0x6D,
  [0x60] = 0x79, [0x61] = 0x81, [0x62] = 0x82, [0x63] = 0x83,
  [0x64] = 0x84, [0x65] = 0x85, [0x66] = 0x86, [0x67] = 0x87,
  [0x68] = 0x88, [0x69] = 0x89, [0x6A] = 0x91, [0x6B] = 0x92,
  [0x6C] = 0x93, [0x6D] = 0x94, [0x6E] = 0x95, [0x6F] = 0x96,
  [0x70] = 0x97, [0x71] = 0x98, [0x72] = 0x99, [0x73] = 0xA2,
  [0x74] = 0xA3, [0x75] = 0xA4, [0x76] = 0xA5, [0x77] = 0xA6,
  [0x78] = 0xA7, [0x79] = 0xA8, [0x7A] = 0xA9, [0x7B] = 0xC0,
  [0x7C] = 0x4F, [0x7D] = 0xD0, [0x7E] = 0xA1, [0x7F] = 0x07,
  [0x80] = 0x20, [0x81] = 0x21, [0x82] = 0x22, [0x83] = 0x23,
  [0x84] = 0x24, [0x85] = 0x15, [0x86] = 0x06, [0x87] = 0x17,
  [0x88] = 0x28, [0x89] = 0x29, [0x8A] = 0x2A, [0x8B] = 0x2B,
  [0x8C] = 0x2C, [0x8D] = 0x09, [0x8E] = 0x0A, [0x8F] = 0x1B,
  [0x90] = 0x30, [0x91] = 0x31, [0x92] = 0x1A, [0x93] = 0x33,
  [0x94] = 0x34, [0x95] = 0x35, [0x96] = 0x36, [0x97] = 0x08,
  [0x98] = 0x38, [0x99] = 0x39, [0x9A] = 0x3A, [0x9B] = 0x3B,
  [0x9C] = 0x04, [0x9D] = 0x14, [0x9E] = 0x3E, [0x9F] = 0xFF,
  [0xA0] = 0x41, [0xA1] = 0xAA, [0xA2] = 0x4A, [0xA3] = 0xB1,
  [0xA4] = 0x9F, [0xA5] = 0xB2, [0xA6] = 0x6A, [0xA7] = 0xB5,
  [0xA8] = 0xBD, [0xA9] = 0xB4, [0xAA] = 0x9A, [0xAB] = 0x8A,
  [0xAC] = 0x5F, [0xAD] = 0xCA, [0xAE] = 0xAF, [0xAF] = 0xBC,
  [0xB0] = 0x90, [0xB1] = 0x8F, [0xB2] = 0xEA, [0xB3] = 0xFA,
  [0xB4] = 0xBE, [0xB5] = 0xA0, [0xB6] = 0xB6, [0xB7] = 0xB3,
  [0xB8] = 0x9D, [0xB9] = 0xDA, [0xBA] = 0x9B, [0xBB] = 0x8B,
  [0xBC] = 0xB7, [0xBD] = 0xB8, [0xBE] = 0xB9, [0xBF] = 0xAB,
  [0xC0] = 0x64, [0xC1] = 0x65, [0xC2] = 0x62, [0xC3] = 0x66,
  [0xC4] = 0x63, [0xC5] = 0x67, [0xC6] = 0x9E, [0xC7] = 0x68,
  [0xC8] = 0x74, [0xC9] = 0x71, [0xCA] = 0x72, [0xCB] = 0x73,
  [0xCC] = 0x78, [0xCD] = 0x75, [0xCE] = 0x76, [0xCF] = 0x77,
  [0xD0] = 0xAC, [0xD1] = 0x69, [0xD2] = 0xED, [0xD3] = 0xEE,
  [0xD4] = 0xEB, [0xD5] = 0xEF, [0xD6] = 0xEC, [0xD7] = 0xBF,
  [0xD8] = 0x80, [0xD9] = 0xFD, [0xDA] = 0xFE, [0xDB] = 0xFB,
  [0xDC] = 0xFC, [0xDD] = 0xAD, [0xDE] = 0xAE, [0xDF] = 0x59,
  [0xE0] = 0x44, [0xE1] = 0x45, [0xE2] = 0x42, [0xE3] = 0x46,
  [0xE4] = 0x43, [0xE5] = 0x47, [0xE6] = 0x9C, [0xE7] = 0x48,
  [0xE8] = 0x54, [0xE9] = 0x51, [0xEA] = 0x52, [0xEB] = 0x53,
  [0xEC] = 0x58, [0xED] = 0x55, [0xEE] = 0x56, [0xEF] = 0x57,
  [0xF0] = 0x8C, [0xF1] = 0x49, [0xF2] = 0xCD, [0xF3] = 0xCE,
  [0xF4] = 0xCB, [0xF5] = 0xCF, [0xF6] = 0xCC, [0xF7] = 0xE1,
  [0xF8] = 0x70, [0xF9] = 0xDD, [0xFA] = 0xDE, [0xFB] = 0xDB,
  [0xFC] = 0xDC, [0xFD] = 0x8D, [0xFE] = 0x8E, [0xFF] = 0xDF
};

// conversion table from IBM037 to ISO-8859-1
static const unsigned char table_cp037_iso8859_1[256]
__attribute__ ((aligned (8))) =
{
  [0x00] = 0x00, [0x01] = 0x01, [0x02] = 0x02, [0x03] = 0x03,
  [0x04] = 0x9C, [0x05] = 0x09, [0x06] = 0x86, [0x07] = 0x7F,
  [0x08] = 0x97, [0x09] = 0x8D, [0x0A] = 0x8E, [0x0B] = 0x0B,
  [0x0C] = 0x0C, [0x0D] = 0x0D, [0x0E] = 0x0E, [0x0F] = 0x0F,
  [0x10] = 0x10, [0x11] = 0x11, [0x12] = 0x12, [0x13] = 0x13,
  [0x14] = 0x9D, [0x15] = 0x85, [0x16] = 0x08, [0x17] = 0x87,
  [0x18] = 0x18, [0x19] = 0x19, [0x1A] = 0x92, [0x1B] = 0x8F,
  [0x1C] = 0x1C, [0x1D] = 0x1D, [0x1E] = 0x1E, [0x1F] = 0x1F,
  [0x20] = 0x80, [0x21] = 0x81, [0x22] = 0x82, [0x23] = 0x83,
  [0x24] = 0x84, [0x25] = 0x0A, [0x26] = 0x17, [0x27] = 0x1B,
  [0x28] = 0x88, [0x29] = 0x89, [0x2A] = 0x8A, [0x2B] = 0x8B,
  [0x2C] = 0x8C, [0x2D] = 0x05, [0x2E] = 0x06, [0x2F] = 0x07,
  [0x30] = 0x90, [0x31] = 0x91, [0x32] = 0x16, [0x33] = 0x93,
  [0x34] = 0x94, [0x35] = 0x95, [0x36] = 0x96, [0x37] = 0x04,
  [0x38] = 0x98, [0x39] = 0x99, [0x3A] = 0x9A, [0x3B] = 0x9B,
  [0x3C] = 0x14, [0x3D] = 0x15, [0x3E] = 0x9E, [0x3F] = 0x1A,
  [0x40] = 0x20, [0x41] = 0xA0, [0x42] = 0xE2, [0x43] = 0xE4,
  [0x44] = 0xE0, [0x45] = 0xE1, [0x46] = 0xE3, [0x47] = 0xE5,
  [0x48] = 0xE7, [0x49] = 0xF1, [0x4A] = 0xA2, [0x4B] = 0x2E,
  [0x4C] = 0x3C, [0x4D] = 0x28, [0x4E] = 0x2B, [0x4F] = 0x7C,
  [0x50] = 0x26, [0x51] = 0xE9, [0x52] = 0xEA, [0x53] = 0xEB,
  [0x54] = 0xE8, [0x55] = 0xED, [0x56] = 0xEE, [0x57] = 0xEF,
  [0x58] = 0xEC, [0x59] = 0xDF, [0x5A] = 0x21, [0x5B] = 0x24,
  [0x5C] = 0x2A, [0x5D] = 0x29, [0x5E] = 0x3B, [0x5F] = 0xAC,
  [0x60] = 0x2D, [0x61] = 0x2F, [0x62] = 0xC2, [0x63] = 0xC4,
  [0x64] = 0xC0, [0x65] = 0xC1, [0x66] = 0xC3, [0x67] = 0xC5,
  [0x68] = 0xC7, [0x69] = 0xD1, [0x6A] = 0xA6, [0x6B] = 0x2C,
  [0x6C] = 0x25, [0x6D] = 0x5F, [0x6E] = 0x3E, [0x6F] = 0x3F,
  [0x70] = 0xF8, [0x71] = 0xC9, [0x72] = 0xCA, [0x73] = 0xCB,
  [0x74] = 0xC8, [0x75] = 0xCD, [0x76] = 0xCE, [0x77] = 0xCF,
  [0x78] = 0xCC, [0x79] = 0x60, [0x7A] = 0x3A, [0x7B] = 0x23,
  [0x7C] = 0x40, [0x7D] = 0x27, [0x7E] = 0x3D, [0x7F] = 0x22,
  [0x80] = 0xD8, [0x81] = 0x61, [0x82] = 0x62, [0x83] = 0x63,
  [0x84] = 0x64, [0x85] = 0x65, [0x86] = 0x66, [0x87] = 0x67,
  [0x88] = 0x68, [0x89] = 0x69, [0x8A] = 0xAB, [0x8B] = 0xBB,
  [0x8C] = 0xF0, [0x8D] = 0xFD, [0x8E] = 0xFE, [0x8F] = 0xB1,
  [0x90] = 0xB0, [0x91] = 0x6A, [0x92] = 0x6B, [0x93] = 0x6C,
  [0x94] = 0x6D, [0x95] = 0x6E, [0x96] = 0x6F, [0x97] = 0x70,
  [0x98] = 0x71, [0x99] = 0x72, [0x9A] = 0xAA, [0x9B] = 0xBA,
  [0x9C] = 0xE6, [0x9D] = 0xB8, [0x9E] = 0xC6, [0x9F] = 0xA4,
  [0xA0] = 0xB5, [0xA1] = 0x7E, [0xA2] = 0x73, [0xA3] = 0x74,
  [0xA4] = 0x75, [0xA5] = 0x76, [0xA6] = 0x77, [0xA7] = 0x78,
  [0xA8] = 0x79, [0xA9] = 0x7A, [0xAA] = 0xA1, [0xAB] = 0xBF,
  [0xAC] = 0xD0, [0xAD] = 0xDD, [0xAE] = 0xDE, [0xAF] = 0xAE,
  [0xB0] = 0x5E, [0xB1] = 0xA3, [0xB2] = 0xA5, [0xB3] = 0xB7,
  [0xB4] = 0xA9, [0xB5] = 0xA7, [0xB6] = 0xB6, [0xB7] = 0xBC,
  [0xB8] = 0xBD, [0xB9] = 0xBE, [0xBA] = 0x5B, [0xBB] = 0x5D,
  [0xBC] = 0xAF, [0xBD] = 0xA8, [0xBE] = 0xB4, [0xBF] = 0xD7,
  [0xC0] = 0x7B, [0xC1] = 0x41, [0xC2] = 0x42, [0xC3] = 0x43,
  [0xC4] = 0x44, [0xC5] = 0x45, [0xC6] = 0x46, [0xC7] = 0x47,
  [0xC8] = 0x48, [0xC9] = 0x49, [0xCA] = 0xAD, [0xCB] = 0xF4,
  [0xCC] = 0xF6, [0xCD] = 0xF2, [0xCE] = 0xF3, [0xCF] = 0xF5,
  [0xD0] = 0x7D, [0xD1] = 0x4A, [0xD2] = 0x4B, [0xD3] = 0x4C,
  [0xD4] = 0x4D, [0xD5] = 0x4E, [0xD6] = 0x4F, [0xD7] = 0x50,
  [0xD8] = 0x51, [0xD9] = 0x52, [0xDA] = 0xB9, [0xDB] = 0xFB,
  [0xDC] = 0xFC, [0xDD] = 0xF9, [0xDE] = 0xFA, [0xDF] = 0xFF,
  [0xE0] = 0x5C, [0xE1] = 0xF7, [0xE2] = 0x53, [0xE3] = 0x54,
  [0xE4] = 0x55, [0xE5] = 0x56, [0xE6] = 0x57, [0xE7] = 0x58,
  [0xE8] = 0x59, [0xE9] = 0x5A, [0xEA] = 0xB2, [0xEB] = 0xD4,
  [0xEC] = 0xD6, [0xED] = 0xD2, [0xEE] = 0xD3, [0xEF] = 0xD5,
  [0xF0] = 0x30, [0xF1] = 0x31, [0xF2] = 0x32, [0xF3] = 0x33,
  [0xF4] = 0x34, [0xF5] = 0x35, [0xF6] = 0x36, [0xF7] = 0x37,
  [0xF8] = 0x38, [0xF9] = 0x39, [0xFA] = 0xB3, [0xFB] = 0xDB,
  [0xFC] = 0xDC, [0xFD] = 0xD9, [0xFE] = 0xDA, [0xFF] = 0x9F
};

/* Definitions used in the body of the `gconv' function.  */
#define CHARSET_NAME		"ISO-8859-1//"
#define FROM_LOOP		iso8859_1_to_cp037_z900
#define TO_LOOP			cp037_to_iso8859_1_z900
#define DEFINE_INIT		1
#define DEFINE_FINI		1
#define MIN_NEEDED_FROM		1
#define MIN_NEEDED_TO		1

/* The Z900 variant of troo forces us to always specify a test
   character which ends the translation.  So if we run into the
   situation where the translation has been interrupted due to the
   test character we translate the character by hand and jump back
   into the instruction.  */

#define TROO_LOOP(TABLE)						\
  {									\
    register const unsigned char test asm ("0") = 0;			\
    register const unsigned char *pTable asm ("1") = TABLE;		\
    register unsigned char *pOutput asm ("2") = outptr;			\
    register uint64_t length asm ("3");					\
    const unsigned char* pInput = inptr;				\
    uint64_t tmp;							\
									\
    length = (inend - inptr < outend - outptr				\
	      ? inend - inptr : outend - outptr);			\
									\
    asm volatile ("0:                        \n\t"			\
                  "  troo    %0,%1           \n\t"			\
                  "  jz      1f              \n\t"			\
                  "  jo      0b              \n\t"			\
                  "  llgc    %3,0(%1)        \n\t"			\
                  "  la      %3,0(%3,%4)     \n\t"			\
                  "  mvc     0(1,%0),0(%3)   \n\t"			\
                  "  aghi    %1,1            \n\t"			\
                  "  aghi    %0,1            \n\t"			\
                  "  aghi    %2,-1           \n\t"			\
                  "  j       0b              \n\t"			\
                  "1:                        \n"			\
									\
     : "+a" (pOutput), "+a" (pInput), "+d" (length), "=&a" (tmp)        \
     : "a" (pTable), "d" (test)						\
     : "cc");								\
									\
    inptr = pInput;							\
    outptr = pOutput;							\
  }

/* First define the conversion function from ISO 8859-1 to CP037.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_FROM
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_TO
#define LOOPFCT			FROM_LOOP
#define BODY TROO_LOOP (table_iso8859_1_to_cp037)

#include <iconv/loop.c>


/* Next, define the conversion function from CP037 to ISO 8859-1.  */
#define MIN_NEEDED_INPUT	MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT	MIN_NEEDED_FROM
#define LOOPFCT			TO_LOOP
#define BODY TROO_LOOP (table_cp037_iso8859_1);

#include <iconv/loop.c>


/* Now define the toplevel functions.  */
#include <iconv/skeleton.c>