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b08d5a8f | 1 | /* Convert from file to memory representation. |
1ccdfb68 | 2 | Copyright (C) 1998, 1999, 2000, 2002, 2012, 2015 Red Hat, Inc. |
de2ed97f | 3 | This file is part of elfutils. |
b08d5a8f UD |
4 | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
5 | ||
de2ed97f MW |
6 | This file is free software; you can redistribute it and/or modify |
7 | it under the terms of either | |
b08d5a8f | 8 | |
de2ed97f MW |
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 | |
361df7da UD |
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. | |
b08d5a8f | 25 | |
de2ed97f MW |
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/>. */ | |
b08d5a8f UD |
29 | |
30 | #ifdef HAVE_CONFIG_H | |
31 | # include <config.h> | |
32 | #endif | |
33 | ||
34 | #include <assert.h> | |
b08d5a8f UD |
35 | #include <string.h> |
36 | ||
37 | #include "libelfP.h" | |
38 | ||
39 | #ifndef LIBELFBITS | |
40 | # define LIBELFBITS 32 | |
41 | #endif | |
42 | ||
43 | ||
44 | Elf_Data * | |
1ccdfb68 MW |
45 | elfw2(LIBELFBITS, xlatetom) (Elf_Data *dest, const Elf_Data *src, |
46 | unsigned int encode) | |
b08d5a8f UD |
47 | { |
48 | /* First test whether the input data is really suitable for this | |
49 | type. This means, whether there is an integer number of records. | |
50 | Note that for this implementation the memory and file size of the | |
51 | data types are identical. */ | |
b9d16789 | 52 | size_t recsize = __libelf_type_sizes[ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type]; |
b08d5a8f UD |
53 | |
54 | ||
bc0f7450 PM |
55 | /* We shouldn't require integer number of records when processing |
56 | notes. Payload bytes follow the header immediately, it's not an | |
57 | array of records as is the case otherwise. */ | |
5199e158 | 58 | if (src->d_type != ELF_T_NHDR && src->d_type != ELF_T_NHDR8 |
bc0f7450 | 59 | && src->d_size % recsize != 0) |
b08d5a8f UD |
60 | { |
61 | __libelf_seterrno (ELF_E_INVALID_DATA); | |
62 | return NULL; | |
63 | } | |
64 | ||
65 | /* Next see whether the converted data fits in the output buffer. */ | |
66 | if (src->d_size > dest->d_size) | |
67 | { | |
68 | __libelf_seterrno (ELF_E_DEST_SIZE); | |
69 | return NULL; | |
70 | } | |
71 | ||
72 | /* Test the encode parameter. */ | |
73 | if (encode != ELFDATA2LSB && encode != ELFDATA2MSB) | |
74 | { | |
75 | __libelf_seterrno (ELF_E_INVALID_ENCODING); | |
76 | return NULL; | |
77 | } | |
78 | ||
79 | /* Determine the translation function to use. | |
80 | ||
81 | At this point we make an assumption which is valid for all | |
82 | existing implementations so far: the memory and file sizes are | |
83 | the same. This has very important consequences: | |
84 | a) The requirement that the source and destination buffer can | |
85 | overlap can easily be fulfilled. | |
86 | b) We need only one function to convert from and memory to file | |
87 | and vice versa since the function only has to copy and/or | |
88 | change the byte order. | |
89 | */ | |
90 | if ((BYTE_ORDER == LITTLE_ENDIAN && encode == ELFDATA2LSB) | |
91 | || (BYTE_ORDER == BIG_ENDIAN && encode == ELFDATA2MSB)) | |
92 | { | |
93 | /* We simply have to copy since the byte order is the same. */ | |
94 | if (src->d_buf != dest->d_buf) | |
95 | memmove (dest->d_buf, src->d_buf, src->d_size); | |
96 | } | |
97 | else | |
98 | { | |
99 | xfct_t fctp; | |
b9d16789 | 100 | fctp = __elf_xfctstom[ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type]; |
b08d5a8f UD |
101 | |
102 | /* Do the real work. */ | |
103 | (*fctp) (dest->d_buf, src->d_buf, src->d_size, 0); | |
104 | } | |
105 | ||
106 | /* Now set the real destination type and length since the operation was | |
107 | successful. */ | |
108 | dest->d_type = src->d_type; | |
109 | dest->d_size = src->d_size; | |
110 | ||
111 | return dest; | |
112 | } | |
113 | INTDEF(elfw2(LIBELFBITS, xlatetom)) |