/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "ap_config.h"
#if APR_CHARSET_EBCDIC
#include "ebcdic.h"
/*
           Initial Port for  Apache-1.3 by <Martin.Kraemer Mch.SNI.De>

"BS2000 OSD" is a POSIX on a main frame. It is made by Siemens AG, Germany.
Within the POSIX subsystem, the same character set was chosen as in
"native BS2000", namely EBCDIC.

EBCDIC Table. (Yes, in EBCDIC, the letters 'a'..'z' are not contiguous!)
This apr_table_t is bijective, i.e. there are no ambigous or duplicate characters
00    00 01 02 03 85 09 86 7f  87 8d 8e 0b 0c 0d 0e 0f  *................*
10    10 11 12 13 8f 0a 08 97  18 19 9c 9d 1c 1d 1e 1f  *................*
20    80 81 82 83 84 92 17 1b  88 89 8a 8b 8c 05 06 07  *................*
30    90 91 16 93 94 95 96 04  98 99 9a 9b 14 15 9e 1a  *................*
40    20 a0 e2 e4 e0 e1 e3 e5  e7 f1 60 2e 3c 28 2b 7c  * .........`.<(+|*
50    26 e9 ea eb e8 ed ee ef  ec df 21 24 2a 29 3b 9f  *&.........!$*);.*
60    2d 2f c2 c4 c0 c1 c3 c5  c7 d1 5e 2c 25 5f 3e 3f  *-/........^,%_>?*
70    f8 c9 ca cb c8 cd ce cf  cc a8 3a 23 40 27 3d 22  *..........:#@'="*
80    d8 61 62 63 64 65 66 67  68 69 ab bb f0 fd fe b1  *.abcdefghi......*
90    b0 6a 6b 6c 6d 6e 6f 70  71 72 aa ba e6 b8 c6 a4  *.jklmnopqr......*
a0    b5 af 73 74 75 76 77 78  79 7a a1 bf d0 dd de ae  *..stuvwxyz......*
b0    a2 a3 a5 b7 a9 a7 b6 bc  bd be ac 5b 5c 5d b4 d7  *...........[\]..*
c0    f9 41 42 43 44 45 46 47  48 49 ad f4 f6 f2 f3 f5  *.ABCDEFGHI......*
d0    a6 4a 4b 4c 4d 4e 4f 50  51 52 b9 fb fc db fa ff  *.JKLMNOPQR......*
e0    d9 f7 53 54 55 56 57 58  59 5a b2 d4 d6 d2 d3 d5  *..STUVWXYZ......*
f0    30 31 32 33 34 35 36 37  38 39 b3 7b dc 7d da 7e  *0123456789.{.}.~*
*/

/* The bijective ebcdic-to-ascii table: */
const unsigned char os_toascii_strictly[256] = {
/*00*/ 0x00, 0x01, 0x02, 0x03, 0x85, 0x09, 0x86, 0x7f,
       0x87, 0x8d, 0x8e, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /*................*/
/*10*/ 0x10, 0x11, 0x12, 0x13, 0x8f, 0x0a, 0x08, 0x97,
       0x18, 0x19, 0x9c, 0x9d, 0x1c, 0x1d, 0x1e, 0x1f, /*................*/
/*20*/ 0x80, 0x81, 0x82, 0x83, 0x84, 0x92, 0x17, 0x1b,
       0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x05, 0x06, 0x07, /*................*/
/*30*/ 0x90, 0x91, 0x16, 0x93, 0x94, 0x95, 0x96, 0x04,
       0x98, 0x99, 0x9a, 0x9b, 0x14, 0x15, 0x9e, 0x1a, /*................*/
/*40*/ 0x20, 0xa0, 0xe2, 0xe4, 0xe0, 0xe1, 0xe3, 0xe5,
       0xe7, 0xf1, 0x60, 0x2e, 0x3c, 0x28, 0x2b, 0x7c, /* .........`.<(+|*/
/*50*/ 0x26, 0xe9, 0xea, 0xeb, 0xe8, 0xed, 0xee, 0xef,
       0xec, 0xdf, 0x21, 0x24, 0x2a, 0x29, 0x3b, 0x9f, /*&.........!$*);.*/
/*60*/ 0x2d, 0x2f, 0xc2, 0xc4, 0xc0, 0xc1, 0xc3, 0xc5,
       0xc7, 0xd1, 0x5e, 0x2c, 0x25, 0x5f, 0x3e, 0x3f, /*-/........^,%_>?*/
/*70*/ 0xf8, 0xc9, 0xca, 0xcb, 0xc8, 0xcd, 0xce, 0xcf,
       0xcc, 0xa8, 0x3a, 0x23, 0x40, 0x27, 0x3d, 0x22, /*..........:#@'="*/
/*80*/ 0xd8, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
       0x68, 0x69, 0xab, 0xbb, 0xf0, 0xfd, 0xfe, 0xb1, /*.abcdefghi......*/
/*90*/ 0xb0, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70,
       0x71, 0x72, 0xaa, 0xba, 0xe6, 0xb8, 0xc6, 0xa4, /*.jklmnopqr......*/
/*a0*/ 0xb5, 0xaf, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
       0x79, 0x7a, 0xa1, 0xbf, 0xd0, 0xdd, 0xde, 0xae, /*..stuvwxyz......*/
/*b0*/ 0xa2, 0xa3, 0xa5, 0xb7, 0xa9, 0xa7, 0xb6, 0xbc,
       0xbd, 0xbe, 0xac, 0x5b, 0x5c, 0x5d, 0xb4, 0xd7, /*...........[\]..*/
/*c0*/ 0xf9, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
       0x48, 0x49, 0xad, 0xf4, 0xf6, 0xf2, 0xf3, 0xf5, /*.ABCDEFGHI......*/
/*d0*/ 0xa6, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
       0x51, 0x52, 0xb9, 0xfb, 0xfc, 0xdb, 0xfa, 0xff, /*.JKLMNOPQR......*/
/*e0*/ 0xd9, 0xf7, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
       0x59, 0x5a, 0xb2, 0xd4, 0xd6, 0xd2, 0xd3, 0xd5, /*..STUVWXYZ......*/
/*f0*/ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
       0x38, 0x39, 0xb3, 0x7b, 0xdc, 0x7d, 0xda, 0x7e  /*0123456789.{.}.~*/
};

/* This apr_table_t is (almost) identical to the previous one. The only difference
 * is the fact that it maps every EBCDIC *except 0x0A* to its ASCII
 * equivalent. The reason for this apr_table_t is simple: Throughout the
 * server, protocol strings are used in the form
 *  "Content-Type: text/plain\015\012". Now all the characters in the string
 * are stored as EBCDIC, only the semantics of \012 is completely
 * different from LF (look it up in the apr_table_t above). \015 happens to be
 * mapped to \015 anyway, so there's no special case for it.
 *
 * In THIS table, EBCDIC-\012 is mapped to ASCII-\012.
 * This apr_table_t is therefore used wherever an EBCDIC to ASCII conversion is
 * needed in the server.
 */
/* ebcdic-to-ascii with \012 mapped to ASCII-\n */
const unsigned char os_toascii[256] = {
/*00*/ 0x00, 0x01, 0x02, 0x03, 0x85, 0x09, 0x86, 0x7f,
       0x87, 0x8d, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /*................*/
/*10*/ 0x10, 0x11, 0x12, 0x13, 0x8f, 0x0a, 0x08, 0x97,
       0x18, 0x19, 0x9c, 0x9d, 0x1c, 0x1d, 0x1e, 0x1f, /*................*/
/*20*/ 0x80, 0x81, 0x82, 0x83, 0x84, 0x92, 0x17, 0x1b,
       0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x05, 0x06, 0x07, /*................*/
/*30*/ 0x90, 0x91, 0x16, 0x93, 0x94, 0x95, 0x96, 0x04,
       0x98, 0x99, 0x9a, 0x9b, 0x14, 0x15, 0x9e, 0x1a, /*................*/
/*40*/ 0x20, 0xa0, 0xe2, 0xe4, 0xe0, 0xe1, 0xe3, 0xe5,
       0xe7, 0xf1, 0x60, 0x2e, 0x3c, 0x28, 0x2b, 0x7c, /* .........`.<(+|*/
/*50*/ 0x26, 0xe9, 0xea, 0xeb, 0xe8, 0xed, 0xee, 0xef,
       0xec, 0xdf, 0x21, 0x24, 0x2a, 0x29, 0x3b, 0x9f, /*&.........!$*);.*/
/*60*/ 0x2d, 0x2f, 0xc2, 0xc4, 0xc0, 0xc1, 0xc3, 0xc5,
       0xc7, 0xd1, 0x5e, 0x2c, 0x25, 0x5f, 0x3e, 0x3f, /*-/........^,%_>?*/
/*70*/ 0xf8, 0xc9, 0xca, 0xcb, 0xc8, 0xcd, 0xce, 0xcf,
       0xcc, 0xa8, 0x3a, 0x23, 0x40, 0x27, 0x3d, 0x22, /*..........:#@'="*/
/*80*/ 0xd8, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
       0x68, 0x69, 0xab, 0xbb, 0xf0, 0xfd, 0xfe, 0xb1, /*.abcdefghi......*/
/*90*/ 0xb0, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70,
       0x71, 0x72, 0xaa, 0xba, 0xe6, 0xb8, 0xc6, 0xa4, /*.jklmnopqr......*/
/*a0*/ 0xb5, 0xaf, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
       0x79, 0x7a, 0xa1, 0xbf, 0xd0, 0xdd, 0xde, 0xae, /*..stuvwxyz......*/
/*b0*/ 0xa2, 0xa3, 0xa5, 0xb7, 0xa9, 0xa7, 0xb6, 0xbc,
       0xbd, 0xbe, 0xac, 0x5b, 0x5c, 0x5d, 0xb4, 0xd7, /*...........[\]..*/
/*c0*/ 0xf9, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
       0x48, 0x49, 0xad, 0xf4, 0xf6, 0xf2, 0xf3, 0xf5, /*.ABCDEFGHI......*/
/*d0*/ 0xa6, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
       0x51, 0x52, 0xb9, 0xfb, 0xfc, 0xdb, 0xfa, 0xff, /*.JKLMNOPQR......*/
/*e0*/ 0xd9, 0xf7, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
       0x59, 0x5a, 0xb2, 0xd4, 0xd6, 0xd2, 0xd3, 0xd5, /*..STUVWXYZ......*/
/*f0*/ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
       0x38, 0x39, 0xb3, 0x7b, 0xdc, 0x7d, 0xda, 0x7e  /*0123456789.{.}.~*/
};

/* The ascii-to-ebcdic table:
00    00 01 02 03 37 2d 2e 2f  16 05 15 0b 0c 0d 0e 0f  *................*
10    10 11 12 13 3c 3d 32 26  18 19 3f 27 1c 1d 1e 1f  *................*
20    40 5a 7f 7b 5b 6c 50 7d  4d 5d 5c 4e 6b 60 4b 61  * !"#$%&'()*+,-./
30    f0 f1 f2 f3 f4 f5 f6 f7  f8 f9 7a 5e 4c 7e 6e 6f  *0123456789:;<=>?*
40    7c c1 c2 c3 c4 c5 c6 c7  c8 c9 d1 d2 d3 d4 d5 d6  *@ABCDEFGHIJKLMNO*
50    d7 d8 d9 e2 e3 e4 e5 e6  e7 e8 e9 bb bc bd 6a 6d  *PQRSTUVWXYZ[\]^_*
60    4a 81 82 83 84 85 86 87  88 89 91 92 93 94 95 96  *`abcdefghijklmno*
70    97 98 99 a2 a3 a4 a5 a6  a7 a8 a9 fb 4f fd ff 07  *pqrstuvwxyz{|}~.*
80    20 21 22 23 24 04 06 08  28 29 2a 2b 2c 09 0a 14  *................*
90    30 31 25 33 34 35 36 17  38 39 3a 3b 1a 1b 3e 5f  *................*
a0    41 aa b0 b1 9f b2 d0 b5  79 b4 9a 8a ba ca af a1  *................*
b0    90 8f ea fa be a0 b6 b3  9d da 9b 8b b7 b8 b9 ab  *................*
c0    64 65 62 66 63 67 9e 68  74 71 72 73 78 75 76 77  *................*
d0    ac 69 ed ee eb ef ec bf  80 e0 fe dd fc ad ae 59  *................*
e0    44 45 42 46 43 47 9c 48  54 51 52 53 58 55 56 57  *................*
f0    8c 49 cd ce cb cf cc e1  70 c0 de db dc 8d 8e df  *................*
*/
const unsigned char os_toebcdic[256] = {
/*00*/  0x00, 0x01, 0x02, 0x03, 0x37, 0x2d, 0x2e, 0x2f,
        0x16, 0x05, 0x15, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,  /*................*/
/*10*/  0x10, 0x11, 0x12, 0x13, 0x3c, 0x3d, 0x32, 0x26,
        0x18, 0x19, 0x3f, 0x27, 0x1c, 0x1d, 0x1e, 0x1f,  /*................*/
/*20*/  0x40, 0x5a, 0x7f, 0x7b, 0x5b, 0x6c, 0x50, 0x7d,
        0x4d, 0x5d, 0x5c, 0x4e, 0x6b, 0x60, 0x4b, 0x61,  /* !"#$%&'()*+,-./ */
/*30*/  0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
        0xf8, 0xf9, 0x7a, 0x5e, 0x4c, 0x7e, 0x6e, 0x6f,  /*0123456789:;<=>?*/
/*40*/  0x7c, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
        0xc8, 0xc9, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6,  /*@ABCDEFGHIJKLMNO*/
/*50*/  0xd7, 0xd8, 0xd9, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6,
        0xe7, 0xe8, 0xe9, 0xbb, 0xbc, 0xbd, 0x6a, 0x6d,  /*PQRSTUVWXYZ[\]^_*/
/*60*/  0x4a, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
        0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,  /*`abcdefghijklmno*/
/*70*/  0x97, 0x98, 0x99, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6,
        0xa7, 0xa8, 0xa9, 0xfb, 0x4f, 0xfd, 0xff, 0x07,  /*pqrstuvwxyz{|}~.*/
/*80*/  0x20, 0x21, 0x22, 0x23, 0x24, 0x04, 0x06, 0x08,
        0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x09, 0x0a, 0x14,  /*................*/
/*90*/  0x30, 0x31, 0x25, 0x33, 0x34, 0x35, 0x36, 0x17,
        0x38, 0x39, 0x3a, 0x3b, 0x1a, 0x1b, 0x3e, 0x5f,  /*................*/
/*a0*/  0x41, 0xaa, 0xb0, 0xb1, 0x9f, 0xb2, 0xd0, 0xb5,
        0x79, 0xb4, 0x9a, 0x8a, 0xba, 0xca, 0xaf, 0xa1,  /*................*/
/*b0*/  0x90, 0x8f, 0xea, 0xfa, 0xbe, 0xa0, 0xb6, 0xb3,
        0x9d, 0xda, 0x9b, 0x8b, 0xb7, 0xb8, 0xb9, 0xab,  /*................*/
/*c0*/  0x64, 0x65, 0x62, 0x66, 0x63, 0x67, 0x9e, 0x68,
        0x74, 0x71, 0x72, 0x73, 0x78, 0x75, 0x76, 0x77,  /*................*/
/*d0*/  0xac, 0x69, 0xed, 0xee, 0xeb, 0xef, 0xec, 0xbf,
        0x80, 0xe0, 0xfe, 0xdd, 0xfc, 0xad, 0xae, 0x59,  /*................*/
/*e0*/  0x44, 0x45, 0x42, 0x46, 0x43, 0x47, 0x9c, 0x48,
        0x54, 0x51, 0x52, 0x53, 0x58, 0x55, 0x56, 0x57,  /*................*/
/*f0*/  0x8c, 0x49, 0xcd, 0xce, 0xcb, 0xcf, 0xcc, 0xe1,
        0x70, 0xc0, 0xde, 0xdb, 0xdc, 0x8d, 0x8e, 0xdf   /*................*/
};

/* Translate a memory block from EBCDIC (host charset) to ASCII (net charset)
 * dest and srce may be identical, or separate memory blocks, but
 * should not overlap.
 */
void
ebcdic2ascii(unsigned char *dest, const unsigned char *srce, size_t count)
{
        while (count-- != 0) {
                *dest++ = os_toascii[*srce++];
        }
}
void
ebcdic2ascii_strictly(unsigned char *dest, const unsigned char *srce, size_t count)
{
        while (count-- != 0) {
                *dest++ = os_toascii_strictly[*srce++];
        }
}
void
ascii2ebcdic(unsigned char *dest, const unsigned char *srce, size_t count)
{
        while (count-- != 0) {
                *dest++ = os_toebcdic[*srce++];
        }
}
#endif /*APR_CHARSET_EBCDIC*/