[96040] | 1 | /* $Id: genalias.cpp 103519 2024-02-22 08:43:44Z vboxsync $ */
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| 2 | /** @file
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| 3 | * genalias - generate a number of alias objects.
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| 4 | *
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| 5 | * @note The code has its origin with kLIBC and was added to VBox by the author.
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| 6 | */
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| 7 |
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| 8 | /*
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[98103] | 9 | * Copyright (C) 2022-2023 Oracle and/or its affiliates.
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[96040] | 10 | *
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[96407] | 11 | * This file is part of VirtualBox base platform packages, as
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| 12 | * available from https://www.virtualbox.org.
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| 13 | *
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| 14 | * This program is free software; you can redistribute it and/or
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| 15 | * modify it under the terms of the GNU General Public License
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| 16 | * as published by the Free Software Foundation, in version 3 of the
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| 17 | * License.
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| 18 | *
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| 19 | * This program is distributed in the hope that it will be useful, but
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| 20 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 22 | * General Public License for more details.
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| 23 | *
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| 24 | * You should have received a copy of the GNU General Public License
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| 25 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 26 | *
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| 27 | * SPDX-License-Identifier: GPL-3.0-only
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[96040] | 28 | */
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| 29 |
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| 30 |
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| 31 | /*********************************************************************************************************************************
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| 32 | * Header Files *
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| 33 | *********************************************************************************************************************************/
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| 34 | #include <stdarg.h>
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| 35 | #include <stdio.h>
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| 36 | #include <iprt/stdint.h>
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| 37 | #include <string.h>
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| 38 | #include <time.h>
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| 39 | #include <assert.h>
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| 40 |
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| 41 |
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[96367] | 42 | /*********************************************************************************************************************************
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| 43 | * Defined Constants And Macros *
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| 44 | *********************************************************************************************************************************/
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| 45 | #if defined(RT_OS_DARWIN) || (defined(RT_ARCH_X86) && (defined(RT_OS_WINDOWS) || defined(RT_OS_OS2)))
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| 46 | # define GENALIAS_UNDERSCORED 1
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| 47 | #else
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| 48 | # define GENALIAS_UNDERSCORED 0
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| 49 | #endif
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[96040] | 50 |
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| 51 |
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[96367] | 52 |
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[96040] | 53 | static int Error(const char *pszFormat, ...)
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| 54 | {
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| 55 | va_list va;
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| 56 | fprintf(stderr, "genalias: error: ");
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| 57 | va_start(va, pszFormat);
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| 58 | vfprintf(stderr, pszFormat, va);
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| 59 | va_end(va);
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| 60 | return 1;
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| 61 | }
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| 62 |
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| 63 | static int SyntaxError(const char *pszFormat, ...)
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| 64 | {
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| 65 | va_list va;
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| 66 | fprintf(stderr, "genalias: syntax error: ");
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| 67 | va_start(va, pszFormat);
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| 68 | vfprintf(stderr, pszFormat, va);
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| 69 | va_end(va);
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| 70 | return 1;
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| 71 | }
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| 72 |
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| 73 | static int WriteAliasObjectAOUT(FILE *pOutput, const char *pszAlias, const char *pszReal)
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| 74 | {
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| 75 | #pragma pack(1)
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| 76 | /* ASSUMES 32-bit target. */
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| 77 | struct AoutHdr
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| 78 | {
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| 79 | uint32_t a_info;
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| 80 | uint32_t a_text;
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| 81 | uint32_t a_data;
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| 82 | uint32_t a_bss;
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| 83 | uint32_t a_syms;
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| 84 | uint32_t a_entry;
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| 85 | uint32_t a_trsize;
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| 86 | uint32_t a_drsize;
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| 87 | } Hdr;
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| 88 | #define OMAGIC 0407
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| 89 | struct AoutSym
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| 90 | {
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| 91 | uint32_t n_strx;
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| 92 | uint8_t n_type;
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| 93 | int8_t n_other;
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| 94 | uint16_t n_desc;
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| 95 | uint32_t n_value;
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| 96 | } Sym;
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| 97 | #define N_EXT 1
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| 98 | #define N_INDR 10
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| 99 | #pragma pack()
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| 100 | const uint32_t cchAlias = (uint32_t)strlen(pszAlias);
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| 101 | const uint32_t cchReal = (uint32_t)strlen(pszReal);
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| 102 | uint32_t u32;
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| 103 |
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| 104 | /* write the header. */
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| 105 | memset(&Hdr, 0, sizeof(Hdr));
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| 106 | Hdr.a_info = OMAGIC;
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| 107 | Hdr.a_syms = 2 * sizeof(Sym);
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| 108 | if (fwrite(&Hdr, sizeof(Hdr), 1, pOutput) != 1)
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| 109 | return -2;
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| 110 |
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| 111 | /* The alias symbol. */
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| 112 | Sym.n_strx = 4 + cchReal + 1 + GENALIAS_UNDERSCORED;
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| 113 | Sym.n_type = N_INDR | N_EXT;
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| 114 | Sym.n_other = 0;
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| 115 | Sym.n_desc = 0;
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| 116 | Sym.n_value = 0;
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| 117 | if (fwrite(&Sym, sizeof(Sym), 1, pOutput) != 1)
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| 118 | return -2;
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| 119 |
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| 120 | /* The real symbol. */
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| 121 | Sym.n_strx = 4;
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| 122 | Sym.n_type = N_EXT;
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| 123 | Sym.n_other = 0;
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| 124 | Sym.n_desc = 0;
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| 125 | Sym.n_value = 0;
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| 126 | if (fwrite(&Sym, sizeof(Sym), 1, pOutput) != 1)
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| 127 | return -2;
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| 128 |
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| 129 | /* the string table. */
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| 130 | u32 = 4 + cchReal + 1 + cchAlias + 1 + GENALIAS_UNDERSCORED * 2;
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| 131 | if (fwrite(&u32, 4, 1, pOutput) != 1)
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| 132 | return -2;
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| 133 | #if GENALIAS_UNDERSCORED
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| 134 | if (fputc('_', pOutput) == EOF)
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| 135 | return -2;
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| 136 | #endif
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| 137 | if (fwrite(pszReal, cchReal + 1, 1, pOutput) != 1)
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| 138 | return -2;
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| 139 | #if GENALIAS_UNDERSCORED
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| 140 | if (fputc('_', pOutput) == EOF)
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| 141 | return -2;
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| 142 | #endif
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| 143 | if (fwrite(pszAlias, cchAlias + 1, 1, pOutput) != 1)
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| 144 | return -2;
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| 145 | return 0;
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| 146 | }
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| 147 |
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[96367] | 148 | static int WriteAliasObjectCOFF(FILE *pOutput, const char *pszAlias, const char *pszReal, bool fUnderscored)
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[96040] | 149 | {
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| 150 | #pragma pack(1)
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| 151 | struct CoffHdr
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| 152 | {
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| 153 | uint16_t Machine;
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| 154 | uint16_t NumberOfSections;
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| 155 | uint32_t TimeDateStamp;
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| 156 | uint32_t PointerToSymbolTable;
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| 157 | uint32_t NumberOfSymbols;
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| 158 | uint16_t SizeOfOptionalHeader;
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| 159 | uint16_t Characteristics;
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| 160 | } Hdr;
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| 161 | struct CoffShdr
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| 162 | {
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[96367] | 163 | char Name[8];
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[96040] | 164 | uint32_t VirtualSize;
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| 165 | uint32_t VirtualAddress;
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| 166 | uint32_t SizeOfRawData;
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| 167 | uint32_t PointerToRawData;
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| 168 | uint32_t PointerToRelocations;
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| 169 | uint32_t PointerToLinenumbers;
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| 170 | uint16_t NumberOfRelocations;
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| 171 | uint16_t NumberOfLinenumbers;
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| 172 | uint32_t Characteristics;
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| 173 | } Shdr;
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| 174 | #define IMAGE_SCN_LNK_INFO 0x200
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| 175 | #define IMAGE_SCN_LNK_REMOVE 0x800
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| 176 | struct CoffSym
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| 177 | {
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| 178 | union
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| 179 | {
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| 180 | char ShortName[8];
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| 181 | struct
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| 182 | {
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| 183 | uint32_t Zeros;
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| 184 | uint32_t Offset;
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| 185 | } s;
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| 186 | } u;
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| 187 | uint32_t Value;
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| 188 | uint16_t SectionNumber;
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| 189 | uint16_t Type;
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| 190 | uint8_t StorageClass;
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| 191 | uint8_t NumberOfAuxSymbols;
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| 192 | } Sym;
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| 193 | #define IMAGE_SYM_UNDEFINED 0
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| 194 | #define IMAGE_SYM_TYPE_NULL 0
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| 195 | #define IMAGE_SYM_CLASS_EXTERNAL 2
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| 196 | #define IMAGE_SYM_CLASS_WEAK_EXTERNAL 105
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| 197 | struct CoffAuxWeakExt
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| 198 | {
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| 199 | uint32_t TagIndex;
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| 200 | uint32_t Characteristics;
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| 201 | uint8_t padding[10];
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| 202 | } Aux;
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| 203 | #define IMAGE_WEAK_EXTERN_SEARCH_ALIAS 3
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| 204 | assert(sizeof(Hdr) == 20); assert(sizeof(Sym) == 18); assert(sizeof(Aux) == sizeof(Sym));
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| 205 | #pragma pack()
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| 206 | const uint32_t cchAlias = (uint32_t)strlen(pszAlias);
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| 207 | const uint32_t cchReal = (uint32_t)strlen(pszReal);
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| 208 | uint32_t u32;
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| 209 |
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| 210 | /* write the header. */
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| 211 | Hdr.Machine = 0 /*unknown*/; //0x14c /* i386 */;
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| 212 | Hdr.NumberOfSections = 1;
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| 213 | Hdr.TimeDateStamp = time(NULL);
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| 214 | Hdr.PointerToSymbolTable = sizeof(Hdr) + sizeof(Shdr);
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| 215 | Hdr.NumberOfSymbols = 3;
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| 216 | Hdr.SizeOfOptionalHeader = 0;
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| 217 | Hdr.Characteristics = 0;
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| 218 | if (fwrite(&Hdr, sizeof(Hdr), 1, pOutput) != 1)
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| 219 | return -2;
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| 220 |
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| 221 | /* The directive section. */
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| 222 | if (Hdr.NumberOfSections == 1)
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| 223 | {
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| 224 | memset(&Shdr, 0, sizeof(Shdr));
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| 225 | memcpy(Shdr.Name, ".drectve", 8);
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| 226 | Shdr.Characteristics = IMAGE_SCN_LNK_REMOVE | IMAGE_SCN_LNK_INFO;
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| 227 | if (fwrite(&Shdr, sizeof(Shdr), 1, pOutput) != 1)
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| 228 | return -2;
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| 229 | }
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| 230 |
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| 231 | /* The real symbol. */
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| 232 | memset(&Sym, 0, sizeof(Sym));
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| 233 | Sym.u.s.Offset = 4;
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| 234 | Sym.SectionNumber = IMAGE_SYM_UNDEFINED;
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| 235 | Sym.Type = IMAGE_SYM_TYPE_NULL;
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| 236 | Sym.StorageClass = IMAGE_SYM_CLASS_EXTERNAL;
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| 237 | if (fwrite(&Sym, sizeof(Sym), 1, pOutput) != 1)
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| 238 | return -2;
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| 239 |
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| 240 | /* The alias symbol. */
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| 241 | memset(&Sym, 0, sizeof(Sym));
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[96367] | 242 | Sym.u.s.Offset = fUnderscored + cchReal + 1 + 4;
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[96040] | 243 | Sym.SectionNumber = IMAGE_SYM_UNDEFINED;
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| 244 | Sym.Type = IMAGE_SYM_TYPE_NULL;
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| 245 | Sym.StorageClass = IMAGE_SYM_CLASS_WEAK_EXTERNAL;
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| 246 | Sym.NumberOfAuxSymbols = 1;
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| 247 | if (fwrite(&Sym, sizeof(Sym), 1, pOutput) != 1)
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| 248 | return -2;
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| 249 |
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| 250 | /* aux entry for that. */
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| 251 | memset(&Aux, 0, sizeof(Aux));
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| 252 | Aux.TagIndex = 0;
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| 253 | Aux.Characteristics = IMAGE_WEAK_EXTERN_SEARCH_ALIAS;
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| 254 | if (fwrite(&Aux, sizeof(Aux), 1, pOutput) != 1)
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| 255 | return -2;
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| 256 |
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| 257 | /* the string table. */
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[96367] | 258 | u32 = 4 + cchReal + 1 + cchAlias + 1 + fUnderscored * 2;
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[96040] | 259 | if (fwrite(&u32, 4, 1, pOutput) != 1)
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| 260 | return -2;
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[96367] | 261 | if (fUnderscored)
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| 262 | if (fputc('_', pOutput) == EOF)
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| 263 | return -2;
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[96040] | 264 | if (fwrite(pszReal, cchReal + 1, 1, pOutput) != 1)
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| 265 | return -2;
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[96367] | 266 | if (fUnderscored)
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| 267 | if (fputc('_', pOutput) == EOF)
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| 268 | return -2;
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[96040] | 269 | if (fwrite(pszAlias, cchAlias + 1, 1, pOutput) != 1)
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| 270 | return -2;
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| 271 | return 0;
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| 272 | }
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| 273 |
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[96367] | 274 | static int WriteAliasObjectTargetCOFF(FILE *pOutput, const char *pszAlias, const char *pszReal)
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| 275 | {
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| 276 | return WriteAliasObjectCOFF(pOutput, pszAlias, pszReal, GENALIAS_UNDERSCORED);
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| 277 | }
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| 278 |
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| 279 | static int WriteAliasObjectX86COFF(FILE *pOutput, const char *pszAlias, const char *pszReal)
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| 280 | {
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| 281 | return WriteAliasObjectCOFF(pOutput, pszAlias, pszReal, true /*fUnderscored*/);
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| 282 | }
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| 283 |
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| 284 | static int WriteAliasObjectAmd64COFF(FILE *pOutput, const char *pszAlias, const char *pszReal)
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| 285 | {
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| 286 | return WriteAliasObjectCOFF(pOutput, pszAlias, pszReal, false /*fUnderscored*/);
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| 287 | }
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| 288 |
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| 289 |
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[96040] | 290 | static int WriteAliasObjectELF(FILE *pOutput, const char *pszAlias, const char *pszReal)
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| 291 | {
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| 292 | RT_NOREF(pOutput, pszAlias, pszReal);
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| 293 | fprintf(stderr, "ELF does not support proper aliasing, only option seems to be adding weak symbols with the strong one.\n");
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| 294 | return -1;
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| 295 | }
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| 296 |
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| 297 | static int WriteAliasObjectOMF(FILE *pOutput, const char *pszAlias, const char *pszReal)
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| 298 | {
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| 299 | const uint32_t cchAlias = (uint32_t)strlen(pszAlias);
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| 300 | const uint32_t cchReal = (uint32_t)strlen(pszReal);
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[96041] | 301 | //const uint32_t cchName = cchAlias > 250 ? 250 : cchAlias;
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[96040] | 302 | uint32_t cch;
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| 303 |
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| 304 | if (cchReal >= 250)
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| 305 | return Error("Symbol '%s' is too long!\n", pszReal);
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| 306 | if (cchAlias >= 250)
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| 307 | return Error("Symbol '%s' is too long!\n", pszAlias);
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| 308 |
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| 309 | /* THEADR */
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| 310 | fputc(0x80, pOutput);
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| 311 | cch = cchAlias + 2;
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| 312 | fputc(cch & 0xff, pOutput);
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| 313 | fputc(cch >> 8, pOutput);
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| 314 | fputc(cchAlias, pOutput);
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| 315 | fwrite(pszAlias, cchAlias, 1, pOutput);
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| 316 | fputc(0, pOutput); /* CRC */
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| 317 |
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| 318 | /* ALIAS */
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| 319 | fputc(0xc6, pOutput);
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| 320 | cch = cchAlias + 1 + cchReal + 1 + GENALIAS_UNDERSCORED * 2 + 1;
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| 321 | fputc(cch & 0xff, pOutput);
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| 322 | fputc(cch >> 8, pOutput);
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| 323 | fputc(cchAlias + GENALIAS_UNDERSCORED, pOutput);
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| 324 | if (GENALIAS_UNDERSCORED)
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| 325 | fputc('_', pOutput);
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| 326 | fwrite(pszAlias, cchAlias, 1, pOutput);
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| 327 | fputc(cchReal + GENALIAS_UNDERSCORED, pOutput);
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| 328 | if (GENALIAS_UNDERSCORED)
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| 329 | fputc('_', pOutput);
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| 330 | fwrite(pszReal, cchReal, 1, pOutput);
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| 331 | fputc(0, pOutput); /* CRC */
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| 332 |
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| 333 | /* MODEND32 */
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| 334 | fputc(0x8b, pOutput);
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| 335 | fputc(2, pOutput);
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| 336 | fputc(0, pOutput);
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| 337 | fputc(0, pOutput);
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| 338 | if (fputc(0, pOutput) == EOF) /* CRC */
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| 339 | return -2;
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| 340 | return 0;
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| 341 | }
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| 342 |
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| 343 | static int WriteAliasObjectMACHO(FILE *pOutput, const char *pszAlias, const char *pszReal)
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| 344 | {
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| 345 | RT_NOREF(pOutput, pszAlias, pszReal);
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| 346 | fprintf(stderr, "Mach-O support not implemented yet\n");
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| 347 | return -1;
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| 348 | }
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| 349 |
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| 350 | static int CreateAlias(char *pszBuf, size_t cchInput, char *pszFileBuf, char *pszFilename,
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| 351 | int (*pfnWriter)(FILE *, const char *, const char *))
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| 352 | {
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| 353 | char *pszAlias = pszBuf;
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| 354 | char *pszReal;
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| 355 | char *pszFile;
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| 356 | FILE *pOutput;
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| 357 | int rc;
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| 358 | RT_NOREF(cchInput);
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| 359 |
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| 360 | /*
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| 361 | * Parse input.
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| 362 | */
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| 363 | pszReal = strchr(pszBuf, '=');
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| 364 | if (!pszReal)
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| 365 | return Error("Malformed request: '%s'\n", pszBuf);
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| 366 | *pszReal++ = '\0';
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| 367 |
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| 368 | pszFile = strchr(pszReal, '=');
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| 369 | if (pszFile)
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| 370 | {
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| 371 | *pszFile++ = '\0';
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| 372 | strcpy(pszFilename, pszFile);
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| 373 | }
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| 374 | else
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| 375 | strcat(strcpy(pszFilename, pszAlias), ".o");
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| 376 |
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| 377 | /*
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| 378 | * Open the output file.
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| 379 | */
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| 380 | pOutput = fopen(pszFileBuf, "wb");
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| 381 | if (!pOutput)
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| 382 | return Error("Failed to open '%s' for writing!\n", pszFileBuf);
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| 383 | rc = pfnWriter(pOutput, pszAlias, pszReal);
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| 384 | if (rc == -2)
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| 385 | rc = Error("Write error writing '%s'!\n", pszFileBuf);
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| 386 | fclose(pOutput);
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| 387 | return rc;
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| 388 | }
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| 389 |
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| 390 |
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| 391 | static int Syntax(void)
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| 392 | {
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| 393 | printf("syntax: genalias -f <format> -D <output-dir> alias=real[=file] [alias2=real2[=file2] [..]]\n"
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| 394 | " OR\n"
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| 395 | " genalias -f <format> -D <output-dir> -r <response-file>\n"
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| 396 | "\n"
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| 397 | "Format can be: aout, coff or omf\n"
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| 398 | "The responsefile is a single argument per line.\n");
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| 399 | return 1;
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| 400 | }
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| 401 |
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| 402 |
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| 403 | int main(int argc, char **argv)
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| 404 | {
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| 405 | static char s_szBuf[4096];
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| 406 | static char s_szFile[1024 + sizeof(s_szBuf)];
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| 407 | int (*pfnWriter)(FILE *pOutput, const char *pszAlias, const char *pszReal);
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| 408 | char *pszFilename;
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| 409 | int i;
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| 410 | int rc;
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| 411 |
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| 412 | /*
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| 413 | * Parse arguments.
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| 414 | */
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| 415 | if (argc <= 5)
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| 416 | return Syntax();
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| 417 | if (strcmp(argv[1], "-f"))
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| 418 | return SyntaxError("Expected -f as the 1st argument.\n");
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| 419 | if (!strcmp(argv[2], "aout"))
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| 420 | pfnWriter = WriteAliasObjectAOUT;
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| 421 | else if (!strcmp(argv[2], "coff"))
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[96367] | 422 | pfnWriter = WriteAliasObjectTargetCOFF;
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| 423 | else if (!strcmp(argv[2], "coff.x86"))
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| 424 | pfnWriter = WriteAliasObjectX86COFF;
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| 425 | else if (!strcmp(argv[2], "coff.amd64"))
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| 426 | pfnWriter = WriteAliasObjectAmd64COFF;
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[96040] | 427 | else if (!strcmp(argv[2], "elf"))
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| 428 | pfnWriter = WriteAliasObjectELF;
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| 429 | else if (!strcmp(argv[2], "omf"))
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| 430 | pfnWriter = WriteAliasObjectOMF;
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| 431 | else if (!strcmp(argv[2], "macho"))
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| 432 | pfnWriter = WriteAliasObjectMACHO;
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| 433 | else
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| 434 | return SyntaxError("Unknown format '%s'.\n", argv[2]);
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| 435 | if (strcmp(argv[3], "-D"))
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| 436 | return SyntaxError("Expected -D as the 3rd argument\n");
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| 437 | if (!*argv[4])
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| 438 | return SyntaxError("The output directory name is empty.\n");
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| 439 | size_t cchFile = strlen(argv[4]);
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| 440 | if (cchFile > sizeof(s_szFile) - sizeof(s_szBuf))
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| 441 | return SyntaxError("The output directory name is too long.\n");
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| 442 | memcpy(s_szFile, argv[4], cchFile);
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| 443 | s_szFile[cchFile++] = '/';
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| 444 | pszFilename = &s_szFile[cchFile];
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| 445 |
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| 446 | rc = 0;
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| 447 | if (!strcmp(argv[5], "-r"))
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| 448 | {
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| 449 | /*
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| 450 | * Responsefile.
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| 451 | */
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| 452 | FILE *pResp;
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| 453 | if (argc <= 6)
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| 454 | return SyntaxError("Missing response file name\n");
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| 455 | pResp = fopen(argv[6], "rt");
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| 456 | if (!pResp)
|
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| 457 | return Error("Failed to open '%s' for reading.\n", argv[6]);
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| 458 |
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| 459 | i = 0;
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| 460 | while (fgets(s_szBuf, sizeof(s_szBuf), pResp))
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| 461 | {
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| 462 | size_t cch = strlen(s_szBuf);
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| 463 | i++;
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| 464 | if (cch == sizeof(s_szBuf) && s_szBuf[cch - 1] != '\n')
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| 465 | {
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| 466 | rc = Error("Line %d is too long!\n", i);
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| 467 | break;
|
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| 468 | }
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| 469 | if (cch && s_szBuf[cch - 1] == '\n')
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| 470 | s_szBuf[--cch] = '\0';
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| 471 | rc = CreateAlias(s_szBuf, cch, s_szFile, pszFilename, pfnWriter);
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| 472 | if (rc)
|
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| 473 | break;
|
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| 474 | }
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| 475 |
|
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| 476 | fclose(pResp);
|
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| 477 | }
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| 478 | else
|
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| 479 | {
|
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| 480 | /*
|
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| 481 | * Alias descriptors.
|
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| 482 | */
|
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| 483 | for (i = 5; i < argc; i++)
|
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| 484 | {
|
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| 485 | size_t cch = strlen(argv[i]);
|
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| 486 | if (cch >= sizeof(s_szBuf))
|
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| 487 | return SyntaxError("Argument %d is too long\n", i);
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| 488 | memcpy(s_szBuf, argv[i], cch + 1);
|
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| 489 | rc = CreateAlias(s_szBuf, cch, s_szFile, pszFilename, pfnWriter);
|
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| 490 | if (rc)
|
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| 491 | break;
|
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| 492 | }
|
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| 493 | }
|
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| 494 | return rc;
|
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| 495 | }
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| 496 |
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