diff options
Diffstat (limited to 'libelf/elf32_xlatetof.c')
| -rw-r--r-- | libelf/elf32_xlatetof.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/libelf/elf32_xlatetof.c b/libelf/elf32_xlatetof.c new file mode 100644 index 00000000..27a973ec --- /dev/null +++ b/libelf/elf32_xlatetof.c @@ -0,0 +1,123 @@ +/* Convert from memory to file representation. + Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc. + This file is part of elfutils. + Written by Ulrich Drepper <drepper@redhat.com>, 1998. + + This file is free software; you can redistribute it and/or modify + it under the terms of either + + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at + your option) any later version + + or + + * the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at + your option) any later version + + or both in parallel, as here. + + elfutils 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 + General Public License for more details. + + You should have received copies of the GNU General Public License and + the GNU Lesser General Public License along with this program. If + not, see <http://www.gnu.org/licenses/>. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <assert.h> +#include <endian.h> +#include <string.h> + +#include "libelfP.h" + +#ifndef LIBELFBITS +# define LIBELFBITS 32 +#endif + + +Elf_Data * +elfw2(LIBELFBITS, xlatetof) (dest, src, encode) + Elf_Data *dest; + const Elf_Data *src; + unsigned int encode; +{ + /* First test whether the input data is really suitable for this + type. This means, whether there is an integer number of records. + Note that for this implementation the memory and file size of the + data types are identical. */ +#if EV_NUM != 2 + size_t recsize = __libelf_type_sizes[src->d_version - 1][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type]; +#else + size_t recsize = __libelf_type_sizes[0][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type]; +#endif + + if (src->d_size % recsize != 0) + { + __libelf_seterrno (ELF_E_INVALID_DATA); + return NULL; + } + + /* Next see whether the converted data fits in the output buffer. */ + if (src->d_size > dest->d_size) + { + __libelf_seterrno (ELF_E_DEST_SIZE); + return NULL; + } + + /* Test the encode parameter. */ + if (encode != ELFDATA2LSB && encode != ELFDATA2MSB) + { + __libelf_seterrno (ELF_E_INVALID_ENCODING); + return NULL; + } + + /* Determine the translation function to use. + + At this point we make an assumption which is valid for all + existing implementations so far: the memory and file sizes are + the same. This has very important consequences: + a) The requirement that the source and destination buffer can + overlap can easily be fulfilled. + b) We need only one function to convert from and memory to file + and vice versa since the function only has to copy and/or + change the byte order. + */ + if ((__BYTE_ORDER == __LITTLE_ENDIAN && encode == ELFDATA2LSB) + || (__BYTE_ORDER == __BIG_ENDIAN && encode == ELFDATA2MSB)) + { + /* We simply have to copy since the byte order is the same. */ + if (src->d_buf != dest->d_buf) + memmove (dest->d_buf, src->d_buf, src->d_size); + } + else + { + xfct_t fctp; + + /* Get a pointer to the transformation functions. The `#ifdef' is + a small optimization since we don't anticipate another ELF + version and so would waste "precious" code. */ +#if EV_NUM != 2 + fctp = __elf_xfctstom[dest->d_version - 1][src->d_version - 1][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type]; +#else + fctp = __elf_xfctstom[0][0][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type]; +#endif + + /* Do the real work. */ + (*fctp) (dest->d_buf, src->d_buf, src->d_size, 1); + } + + /* Now set the real destination type and length since the operation was + successful. */ + dest->d_type = src->d_type; + dest->d_size = src->d_size; + + return dest; +} +INTDEF(elfw2(LIBELFBITS, xlatetof)) |