Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 1 | /* Convert from memory to file representation. |
| 2 | Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc. |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 3 | This file is part of elfutils. |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
| 5 | |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 6 | This file is free software; you can redistribute it and/or modify |
| 7 | it under the terms of either |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 8 | |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 9 | * the GNU Lesser General Public License as published by the Free |
| 10 | Software Foundation; either version 3 of the License, or (at |
| 11 | your option) any later version |
| 12 | |
| 13 | or |
| 14 | |
| 15 | * the GNU General Public License as published by the Free |
| 16 | Software Foundation; either version 2 of the License, or (at |
| 17 | your option) any later version |
| 18 | |
| 19 | or both in parallel, as here. |
| 20 | |
| 21 | elfutils is distributed in the hope that it will be useful, but |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 22 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 24 | General Public License for more details. |
| 25 | |
Elliott Hughes | 0333382 | 2015-02-18 22:19:45 -0800 | [diff] [blame] | 26 | You should have received copies of the GNU General Public License and |
| 27 | the GNU Lesser General Public License along with this program. If |
| 28 | not, see <http://www.gnu.org/licenses/>. */ |
Ben Cheng | 25b3c04 | 2013-11-20 14:45:36 -0800 | [diff] [blame] | 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | # include <config.h> |
| 32 | #endif |
| 33 | |
| 34 | #include <assert.h> |
| 35 | #include <endian.h> |
| 36 | #include <string.h> |
| 37 | |
| 38 | #include "libelfP.h" |
| 39 | |
| 40 | #ifndef LIBELFBITS |
| 41 | # define LIBELFBITS 32 |
| 42 | #endif |
| 43 | |
| 44 | |
| 45 | Elf_Data * |
| 46 | elfw2(LIBELFBITS, xlatetof) (dest, src, encode) |
| 47 | Elf_Data *dest; |
| 48 | const Elf_Data *src; |
| 49 | unsigned int encode; |
| 50 | { |
| 51 | /* First test whether the input data is really suitable for this |
| 52 | type. This means, whether there is an integer number of records. |
| 53 | Note that for this implementation the memory and file size of the |
| 54 | data types are identical. */ |
| 55 | #if EV_NUM != 2 |
| 56 | size_t recsize = __libelf_type_sizes[src->d_version - 1][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type]; |
| 57 | #else |
| 58 | size_t recsize = __libelf_type_sizes[0][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type]; |
| 59 | #endif |
| 60 | |
| 61 | if (src->d_size % recsize != 0) |
| 62 | { |
| 63 | __libelf_seterrno (ELF_E_INVALID_DATA); |
| 64 | return NULL; |
| 65 | } |
| 66 | |
| 67 | /* Next see whether the converted data fits in the output buffer. */ |
| 68 | if (src->d_size > dest->d_size) |
| 69 | { |
| 70 | __libelf_seterrno (ELF_E_DEST_SIZE); |
| 71 | return NULL; |
| 72 | } |
| 73 | |
| 74 | /* Test the encode parameter. */ |
| 75 | if (encode != ELFDATA2LSB && encode != ELFDATA2MSB) |
| 76 | { |
| 77 | __libelf_seterrno (ELF_E_INVALID_ENCODING); |
| 78 | return NULL; |
| 79 | } |
| 80 | |
| 81 | /* Determine the translation function to use. |
| 82 | |
| 83 | At this point we make an assumption which is valid for all |
| 84 | existing implementations so far: the memory and file sizes are |
| 85 | the same. This has very important consequences: |
| 86 | a) The requirement that the source and destination buffer can |
| 87 | overlap can easily be fulfilled. |
| 88 | b) We need only one function to convert from and memory to file |
| 89 | and vice versa since the function only has to copy and/or |
| 90 | change the byte order. |
| 91 | */ |
| 92 | if ((__BYTE_ORDER == __LITTLE_ENDIAN && encode == ELFDATA2LSB) |
| 93 | || (__BYTE_ORDER == __BIG_ENDIAN && encode == ELFDATA2MSB)) |
| 94 | { |
| 95 | /* We simply have to copy since the byte order is the same. */ |
| 96 | if (src->d_buf != dest->d_buf) |
| 97 | memmove (dest->d_buf, src->d_buf, src->d_size); |
| 98 | } |
| 99 | else |
| 100 | { |
| 101 | xfct_t fctp; |
| 102 | |
| 103 | /* Get a pointer to the transformation functions. The `#ifdef' is |
| 104 | a small optimization since we don't anticipate another ELF |
| 105 | version and so would waste "precious" code. */ |
| 106 | #if EV_NUM != 2 |
| 107 | fctp = __elf_xfctstom[dest->d_version - 1][src->d_version - 1][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type]; |
| 108 | #else |
| 109 | fctp = __elf_xfctstom[0][0][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type]; |
| 110 | #endif |
| 111 | |
| 112 | /* Do the real work. */ |
| 113 | (*fctp) (dest->d_buf, src->d_buf, src->d_size, 1); |
| 114 | } |
| 115 | |
| 116 | /* Now set the real destination type and length since the operation was |
| 117 | successful. */ |
| 118 | dest->d_type = src->d_type; |
| 119 | dest->d_size = src->d_size; |
| 120 | |
| 121 | return dest; |
| 122 | } |
| 123 | INTDEF(elfw2(LIBELFBITS, xlatetof)) |