initial push

m68k/libelf/lib/getdata.c

@@ -0,0 +1,157 @@
+/*
+getdata.c - implementation of the elf_getdata(3) function.
+Copyright (C) 1995 - 2001 Michael Riepe
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+This library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include <private.h>
+
+#ifndef lint
+static const char rcsid[] = "@(#) $Id: getdata.c,v 1.1 2008/06/16 00:01:22 cjohns Exp $";
+#endif /* lint */
+
+static Elf_Data*
+_elf_cook_scn(Elf *elf, Elf_Scn *scn, Scn_Data *sd) {
+    Elf_Data dst;
+    Elf_Data src;
+    int flag = 0;
+    size_t dlen;
+
+    elf_assert(elf->e_data);
+
+    /*
+     * Prepare source
+     */
+    src = sd->sd_data;
+    src.d_version = elf->e_version;
+    if (elf->e_rawdata) {
+	src.d_buf = elf->e_rawdata + scn->s_offset;
+    }
+    else {
+	src.d_buf = elf->e_data + scn->s_offset;
+    }
+
+    /*
+     * Prepare destination (needs prepared source!)
+     */
+    dst = sd->sd_data;
+    if (elf->e_class == ELFCLASS32) {
+	dlen = _elf32_xltsize(&src, dst.d_version, elf->e_encoding, 0);
+    }
+#if __LIBELF64
+    else if (elf->e_class == ELFCLASS64) {
+	dlen = _elf64_xltsize(&src, dst.d_version, elf->e_encoding, 0);
+    }
+#endif /* __LIBELF64 */
+    else {
+	elf_assert(valid_class(elf->e_class));
+	seterr(ERROR_UNIMPLEMENTED);
+	return NULL;
+    }
+    if (dlen == (size_t)-1) {
+	return NULL;
+    }
+    dst.d_size = dlen;
+    if (elf->e_rawdata != elf->e_data && dst.d_size <= src.d_size) {
+	dst.d_buf = elf->e_data + scn->s_offset;
+    }
+    else if (!(dst.d_buf = malloc(dst.d_size))) {
+	seterr(ERROR_MEM_SCNDATA);
+	return NULL;
+    }
+    else {
+	flag = 1;
+    }
+
+    /*
+     * Translate data
+     */
+    if (_elf_xlatetom(elf, &dst, &src)) {
+	sd->sd_memdata = (char*)dst.d_buf;
+	sd->sd_data = dst;
+	if (!(sd->sd_free_data = flag)) {
+	    elf->e_cooked = 1;
+	}
+	return &sd->sd_data;
+    }
+
+    if (flag) {
+	free(dst.d_buf);
+    }
+    return NULL;
+}
+
+Elf_Data*
+elf_getdata(Elf_Scn *scn, Elf_Data *data) {
+    Scn_Data *sd;
+    Elf *elf;
+
+    if (!scn) {
+	return NULL;
+    }
+    elf_assert(scn->s_magic == SCN_MAGIC);
+    if (scn->s_index == SHN_UNDEF) {
+	seterr(ERROR_NULLSCN);
+    }
+    else if (data) {
+	for (sd = scn->s_data_1; sd; sd = sd->sd_link) {
+	    elf_assert(sd->sd_magic == DATA_MAGIC);
+	    elf_assert(sd->sd_scn == scn);
+	    if (data == &sd->sd_data) {
+		/*
+		 * sd_link allocated by elf_newdata().
+		 */
+		return &sd->sd_link->sd_data;
+	    }
+	}
+	seterr(ERROR_SCNDATAMISMATCH);
+    }
+    else if ((sd = scn->s_data_1)) {
+	elf_assert(sd->sd_magic == DATA_MAGIC);
+	elf_assert(sd->sd_scn == scn);
+	elf = scn->s_elf;
+	elf_assert(elf);
+	elf_assert(elf->e_magic == ELF_MAGIC);
+	if (sd->sd_freeme) {
+	    /* allocated by elf_newdata() */
+	    return &sd->sd_data;
+	}
+	else if (scn->s_type == SHT_NULL) {
+	    seterr(ERROR_NULLSCN);
+	}
+	else if (sd->sd_memdata) {
+	    /* already cooked */
+	    return &sd->sd_data;
+	}
+	else if (scn->s_offset < 0 || scn->s_offset > elf->e_size) {
+	    seterr(ERROR_OUTSIDE);
+	}
+	else if (scn->s_type == SHT_NOBITS || !scn->s_size) {
+	    /* no data to read */
+	    return &sd->sd_data;
+	}
+	else if (scn->s_offset + scn->s_size > elf->e_size) {
+	    seterr(ERROR_TRUNC_SCN);
+	}
+	else if (valid_class(elf->e_class)) {
+	    return _elf_cook_scn(elf, scn, sd);
+	}
+	else {
+	    seterr(ERROR_UNKNOWN_CLASS);
+	}
+    }
+    return NULL;
+}