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Annotation of src/usr.bin/file/elfclass.h, Revision 1.1

1.1     ! chl         1: /*
        !             2:  * Copyright (c) Christos Zoulas 2008.
        !             3:  * All Rights Reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice immediately at the beginning of the file, without modification,
        !            10:  *    this list of conditions, and the following disclaimer.
        !            11:  * 2. Redistributions in binary form must reproduce the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer in the
        !            13:  *    documentation and/or other materials provided with the distribution.
        !            14:  *
        !            15:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            16:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            17:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            18:  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
        !            19:  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            20:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            21:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            22:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            23:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            24:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            25:  * SUCH DAMAGE.
        !            26:  */
        !            27:        if (nbytes <= sizeof(elfhdr))
        !            28:                return 0;
        !            29:
        !            30:        u.l = 1;
        !            31:        (void)memcpy(&elfhdr, buf, sizeof elfhdr);
        !            32:        swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[EI_DATA];
        !            33:
        !            34:        type = elf_getu16(swap, elfhdr.e_type);
        !            35:        switch (type) {
        !            36: #ifdef ELFCORE
        !            37:        case ET_CORE:
        !            38:                if (dophn_core(ms, class, swap, fd,
        !            39:                    (off_t)elf_getu(swap, elfhdr.e_phoff),
        !            40:                    elf_getu16(swap, elfhdr.e_phnum),
        !            41:                    (size_t)elf_getu16(swap, elfhdr.e_phentsize),
        !            42:                    fsize, &flags) == -1)
        !            43:                        return -1;
        !            44:                break;
        !            45: #endif
        !            46:        case ET_EXEC:
        !            47:        case ET_DYN:
        !            48:                if (dophn_exec(ms, class, swap, fd,
        !            49:                    (off_t)elf_getu(swap, elfhdr.e_phoff),
        !            50:                    elf_getu16(swap, elfhdr.e_phnum),
        !            51:                    (size_t)elf_getu16(swap, elfhdr.e_phentsize),
        !            52:                    fsize, &flags) == -1)
        !            53:                        return -1;
        !            54:                /*FALLTHROUGH*/
        !            55:        case ET_REL:
        !            56:                if (doshn(ms, class, swap, fd,
        !            57:                    (off_t)elf_getu(swap, elfhdr.e_shoff),
        !            58:                    elf_getu16(swap, elfhdr.e_shnum),
        !            59:                    (size_t)elf_getu16(swap, elfhdr.e_shentsize),
        !            60:                    &flags) == -1)
        !            61:                        return -1;
        !            62:                break;
        !            63:
        !            64:        default:
        !            65:                break;
        !            66:        }
        !            67:        return 1;