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-rw-r--r--elfcopy/sections.c1518
1 files changed, 1518 insertions, 0 deletions
diff --git a/elfcopy/sections.c b/elfcopy/sections.c
new file mode 100644
index 000000000000..d01659a935ee
--- /dev/null
+++ b/elfcopy/sections.c
@@ -0,0 +1,1518 @@
+/*-
+ * Copyright (c) 2007-2011 Kai Wang
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <err.h>
+#include <libgen.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "elfcopy.h"
+
+ELFTC_VCSID("$Id: sections.c 2358 2011-12-19 18:22:32Z kaiwang27 $");
+
+static void add_gnu_debuglink(struct elfcopy *ecp);
+static uint32_t calc_crc32(const char *p, size_t len, uint32_t crc);
+static void check_section_rename(struct elfcopy *ecp, struct section *s);
+static void filter_reloc(struct elfcopy *ecp, struct section *s);
+static int get_section_flags(struct elfcopy *ecp, const char *name);
+static void insert_sections(struct elfcopy *ecp);
+static void insert_to_strtab(struct section *t, const char *s);
+static int is_append_section(struct elfcopy *ecp, const char *name);
+static int is_compress_section(struct elfcopy *ecp, const char *name);
+static int is_debug_section(const char *name);
+static int is_modify_section(struct elfcopy *ecp, const char *name);
+static int is_print_section(struct elfcopy *ecp, const char *name);
+static int lookup_string(struct section *t, const char *s);
+static void modify_section(struct elfcopy *ecp, struct section *s);
+static void pad_section(struct elfcopy *ecp, struct section *s);
+static void print_data(const char *d, size_t sz);
+static void print_section(struct section *s);
+static void *read_section(struct section *s, size_t *size);
+static void update_reloc(struct elfcopy *ecp, struct section *s);
+
+int
+is_remove_section(struct elfcopy *ecp, const char *name)
+{
+
+ /* Always keep section name table */
+ if (strcmp(name, ".shstrtab") == 0)
+ return 0;
+ if (strcmp(name, ".symtab") == 0 ||
+ strcmp(name, ".strtab") == 0) {
+ if (ecp->strip == STRIP_ALL && lookup_symop_list(
+ ecp, NULL, SYMOP_KEEP) == NULL)
+ return (1);
+ else
+ return (0);
+ }
+
+ if (is_debug_section(name)) {
+ if (ecp->strip == STRIP_ALL ||
+ ecp->strip == STRIP_DEBUG ||
+ ecp->strip == STRIP_UNNEEDED ||
+ (ecp->flags & DISCARD_LOCAL))
+ return (1);
+ if (ecp->strip == STRIP_NONDEBUG)
+ return (0);
+ }
+
+ if ((ecp->flags & SEC_REMOVE) || (ecp->flags & SEC_COPY)) {
+ struct sec_action *sac;
+
+ sac = lookup_sec_act(ecp, name, 0);
+ if ((ecp->flags & SEC_REMOVE) && sac != NULL && sac->remove)
+ return (1);
+ if ((ecp->flags & SEC_COPY) && (sac == NULL || !sac->copy))
+ return (1);
+ }
+
+ return (0);
+}
+
+/*
+ * Relocation section needs to be removed if the section it applies to
+ * will be removed.
+ */
+int
+is_remove_reloc_sec(struct elfcopy *ecp, uint32_t sh_info)
+{
+ const char *name;
+ GElf_Shdr ish;
+ Elf_Scn *is;
+ size_t indx;
+ int elferr;
+
+ if (elf_getshstrndx(ecp->ein, &indx) == 0)
+ errx(EXIT_FAILURE, "elf_getshstrndx failed: %s",
+ elf_errmsg(-1));
+
+ is = NULL;
+ while ((is = elf_nextscn(ecp->ein, is)) != NULL) {
+ if (sh_info == elf_ndxscn(is)) {
+ if (gelf_getshdr(is, &ish) == NULL)
+ errx(EXIT_FAILURE, "gelf_getshdr failed: %s",
+ elf_errmsg(-1));
+ if ((name = elf_strptr(ecp->ein, indx, ish.sh_name)) ==
+ NULL)
+ errx(EXIT_FAILURE, "elf_strptr failed: %s",
+ elf_errmsg(-1));
+ if (is_remove_section(ecp, name))
+ return (1);
+ else
+ return (0);
+ }
+ }
+ elferr = elf_errno();
+ if (elferr != 0)
+ errx(EXIT_FAILURE, "elf_nextscn failed: %s",
+ elf_errmsg(elferr));
+
+ /* Remove reloc section if we can't find the target section. */
+ return (1);
+}
+
+static int
+is_append_section(struct elfcopy *ecp, const char *name)
+{
+ struct sec_action *sac;
+
+ sac = lookup_sec_act(ecp, name, 0);
+ if (sac != NULL && sac->append != 0 && sac->string != NULL)
+ return (1);
+
+ return (0);
+}
+
+static int
+is_compress_section(struct elfcopy *ecp, const char *name)
+{
+ struct sec_action *sac;
+
+ sac = lookup_sec_act(ecp, name, 0);
+ if (sac != NULL && sac->compress != 0)
+ return (1);
+
+ return (0);
+}
+
+static void
+check_section_rename(struct elfcopy *ecp, struct section *s)
+{
+ struct sec_action *sac;
+ char *prefix;
+ size_t namelen;
+
+ if (s->pseudo)
+ return;
+
+ sac = lookup_sec_act(ecp, s->name, 0);
+ if (sac != NULL && sac->rename)
+ s->name = sac->newname;
+
+ if (!strcmp(s->name, ".symtab") ||
+ !strcmp(s->name, ".strtab") ||
+ !strcmp(s->name, ".shstrtab"))
+ return;
+
+ prefix = NULL;
+ if (s->loadable && ecp->prefix_alloc != NULL)
+ prefix = ecp->prefix_alloc;
+ else if (ecp->prefix_sec != NULL)
+ prefix = ecp->prefix_sec;
+
+ if (prefix != NULL) {
+ namelen = strlen(s->name) + strlen(prefix) + 1;
+ if ((s->newname = malloc(namelen)) == NULL)
+ err(EXIT_FAILURE, "malloc failed");
+ snprintf(s->newname, namelen, "%s%s", prefix, s->name);
+ s->name = s->newname;
+ }
+}
+
+static int
+get_section_flags(struct elfcopy *ecp, const char *name)
+{
+ struct sec_action *sac;
+
+ sac = lookup_sec_act(ecp, name, 0);
+ if (sac != NULL && sac->flags)
+ return sac->flags;
+
+ return (0);
+}
+
+/*
+ * Determine whether the section are debugging section.
+ * According to libbfd, debugging sections are recognized
+ * only by name.
+ */
+static int
+is_debug_section(const char *name)
+{
+ const char *dbg_sec[] = {
+ ".debug",
+ ".gnu.linkonce.wi.",
+ ".line",
+ ".stab",
+ NULL
+ };
+ const char **p;
+
+ for(p = dbg_sec; *p; p++) {
+ if (strncmp(name, *p, strlen(*p)) == 0)
+ return (1);
+ }
+
+ return (0);
+}
+
+static int
+is_print_section(struct elfcopy *ecp, const char *name)
+{
+ struct sec_action *sac;
+
+ sac = lookup_sec_act(ecp, name, 0);
+ if (sac != NULL && sac->print != 0)
+ return (1);
+
+ return (0);
+}
+
+static int
+is_modify_section(struct elfcopy *ecp, const char *name)
+{
+
+ if (is_append_section(ecp, name) ||
+ is_compress_section(ecp, name))
+ return (1);
+
+ return (0);
+}
+
+struct sec_action*
+lookup_sec_act(struct elfcopy *ecp, const char *name, int add)
+{
+ struct sec_action *sac;
+
+ if (name == NULL)
+ return NULL;
+
+ STAILQ_FOREACH(sac, &ecp->v_sac, sac_list) {
+ if (strcmp(name, sac->name) == 0)
+ return sac;
+ }
+
+ if (add == 0)
+ return NULL;
+
+ if ((sac = malloc(sizeof(*sac))) == NULL)
+ errx(EXIT_FAILURE, "not enough memory");
+ memset(sac, 0, sizeof(*sac));
+ sac->name = name;
+ STAILQ_INSERT_TAIL(&ecp->v_sac, sac, sac_list);
+
+ return (sac);
+}
+
+void
+free_sec_act(struct elfcopy *ecp)
+{
+ struct sec_action *sac, *sac_temp;
+
+ STAILQ_FOREACH_SAFE(sac, &ecp->v_sac, sac_list, sac_temp) {
+ STAILQ_REMOVE(&ecp->v_sac, sac, sec_action, sac_list);
+ free(sac);
+ }
+}
+
+void
+insert_to_sec_list(struct elfcopy *ecp, struct section *sec, int tail)
+{
+ struct section *s;
+
+ if (!tail) {
+ TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
+ if (sec->off < s->off) {
+ TAILQ_INSERT_BEFORE(s, sec, sec_list);
+ goto inc_nos;
+ }
+ }
+ }
+
+ TAILQ_INSERT_TAIL(&ecp->v_sec, sec, sec_list);
+
+inc_nos:
+ if (sec->pseudo == 0)
+ ecp->nos++;
+}
+
+/*
+ * First step of section creation: create scn and internal section
+ * structure, discard sections to be removed.
+ */
+void
+create_scn(struct elfcopy *ecp)
+{
+ struct section *s;
+ const char *name;
+ Elf_Scn *is;
+ GElf_Shdr ish;
+ size_t indx;
+ uint64_t oldndx, newndx;
+ int elferr, sec_flags;
+
+ /*
+ * Insert a pseudo section that contains the ELF header
+ * and program header. Used as reference for section offset
+ * or load address adjustment.
+ */
+ if ((s = calloc(1, sizeof(*s))) == NULL)
+ err(EXIT_FAILURE, "calloc failed");
+ s->off = 0;
+ s->sz = gelf_fsize(ecp->eout, ELF_T_EHDR, 1, EV_CURRENT) +
+ gelf_fsize(ecp->eout, ELF_T_PHDR, ecp->ophnum, EV_CURRENT);
+ s->align = 1;
+ s->pseudo = 1;
+ s->loadable = add_to_inseg_list(ecp, s);
+ insert_to_sec_list(ecp, s, 0);
+
+ /* Create internal .shstrtab section. */
+ init_shstrtab(ecp);
+
+ if (elf_getshstrndx(ecp->ein, &indx) == 0)
+ errx(EXIT_FAILURE, "elf_getshstrndx failed: %s",
+ elf_errmsg(-1));
+
+ is = NULL;
+ while ((is = elf_nextscn(ecp->ein, is)) != NULL) {
+ if (gelf_getshdr(is, &ish) == NULL)
+ errx(EXIT_FAILURE, "219 gelf_getshdr failed: %s",
+ elf_errmsg(-1));
+ if ((name = elf_strptr(ecp->ein, indx, ish.sh_name)) == NULL)
+ errx(EXIT_FAILURE, "elf_strptr failed: %s",
+ elf_errmsg(-1));
+
+ /* Skip sections to be removed. */
+ if (is_remove_section(ecp, name))
+ continue;
+
+ /*
+ * Relocation section need to be remove if the section
+ * it applies will be removed.
+ */
+ if (ish.sh_type == SHT_REL || ish.sh_type == SHT_RELA)
+ if (ish.sh_info != 0 &&
+ is_remove_reloc_sec(ecp, ish.sh_info))
+ continue;
+
+ /* Get section flags set by user. */
+ sec_flags = get_section_flags(ecp, name);
+
+ /* Create internal section object. */
+ if (strcmp(name, ".shstrtab") != 0) {
+ if ((s = calloc(1, sizeof(*s))) == NULL)
+ err(EXIT_FAILURE, "calloc failed");
+ s->name = name;
+ s->is = is;
+ s->off = ish.sh_offset;
+ s->sz = ish.sh_size;
+ s->align = ish.sh_addralign;
+ s->type = ish.sh_type;
+ s->vma = ish.sh_addr;
+
+ /*
+ * Search program headers to determine whether section
+ * is loadable, but if user explicitly set section flags
+ * while neither "load" nor "alloc" is set, we make the
+ * section unloadable.
+ */
+ if (sec_flags &&
+ (sec_flags & (SF_LOAD | SF_ALLOC)) == 0)
+ s->loadable = 0;
+ else
+ s->loadable = add_to_inseg_list(ecp, s);
+ } else {
+ /* Assuming .shstrtab is "unloadable". */
+ s = ecp->shstrtab;
+ s->off = ish.sh_offset;
+ }
+
+ oldndx = newndx = SHN_UNDEF;
+ if (strcmp(name, ".symtab") != 0 &&
+ strcmp(name, ".strtab") != 0) {
+ if (!strcmp(name, ".shstrtab")) {
+ /*
+ * Add sections specified by --add-section and
+ * gnu debuglink. we want these sections have
+ * smaller index than .shstrtab section.
+ */
+ if (ecp->debuglink != NULL)
+ add_gnu_debuglink(ecp);
+ if (ecp->flags & SEC_ADD)
+ insert_sections(ecp);
+ }
+ if ((s->os = elf_newscn(ecp->eout)) == NULL)
+ errx(EXIT_FAILURE, "elf_newscn failed: %s",
+ elf_errmsg(-1));
+ if ((newndx = elf_ndxscn(s->os)) == SHN_UNDEF)
+ errx(EXIT_FAILURE, "elf_ndxscn failed: %s",
+ elf_errmsg(-1));
+ }
+ if ((oldndx = elf_ndxscn(is)) == SHN_UNDEF)
+ errx(EXIT_FAILURE, "elf_ndxscn failed: %s",
+ elf_errmsg(-1));
+ if (oldndx != SHN_UNDEF && newndx != SHN_UNDEF)
+ ecp->secndx[oldndx] = newndx;
+
+ /*
+ * If strip action is STRIP_NONDEBUG(only keep debug),
+ * change sections flags of loadable sections to SHF_NOBITS,
+ * and the content of those sections will be ignored.
+ */
+ if (ecp->strip == STRIP_NONDEBUG && (ish.sh_flags & SHF_ALLOC))
+ s->type = SHT_NOBITS;
+
+ check_section_rename(ecp, s);
+
+ /* create section header based on input object. */
+ if (strcmp(name, ".symtab") != 0 &&
+ strcmp(name, ".strtab") != 0 &&
+ strcmp(name, ".shstrtab") != 0)
+ copy_shdr(ecp, s, NULL, 0, sec_flags);
+
+ if (strcmp(name, ".symtab") == 0) {
+ ecp->flags |= SYMTAB_EXIST;
+ ecp->symtab = s;
+ }
+ if (strcmp(name, ".strtab") == 0)
+ ecp->strtab = s;
+
+ insert_to_sec_list(ecp, s, 0);
+ }
+ elferr = elf_errno();
+ if (elferr != 0)
+ errx(EXIT_FAILURE, "elf_nextscn failed: %s",
+ elf_errmsg(elferr));
+}
+
+struct section *
+insert_shtab(struct elfcopy *ecp, int tail)
+{
+ struct section *s, *shtab;
+ GElf_Ehdr ieh;
+ int nsecs;
+
+ /*
+ * Treat section header table as a "pseudo" section, insert it
+ * into section list, so later it will get sorted and resynced
+ * just as normal sections.
+ */
+ if ((shtab = calloc(1, sizeof(*shtab))) == NULL)
+ errx(EXIT_FAILURE, "calloc failed");
+ if (!tail) {
+ /* shoff of input object is used as a hint. */
+ if (gelf_getehdr(ecp->ein, &ieh) == NULL)
+ errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
+ elf_errmsg(-1));
+ shtab->off = ieh.e_shoff;
+ } else
+ shtab->off = 0;
+ /* Calculate number of sections in the output object. */
+ nsecs = 0;
+ TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
+ if (!s->pseudo)
+ nsecs++;
+ }
+ /* Remember there is always a null section, so we +1 here. */
+ shtab->sz = gelf_fsize(ecp->eout, ELF_T_SHDR, nsecs + 1, EV_CURRENT);
+ if (shtab->sz == 0)
+ errx(EXIT_FAILURE, "gelf_fsize() failed: %s", elf_errmsg(-1));
+ shtab->align = (ecp->oec == ELFCLASS32 ? 4 : 8);
+ shtab->loadable = 0;
+ shtab->pseudo = 1;
+ insert_to_sec_list(ecp, shtab, tail);
+
+ return (shtab);
+}
+
+void
+copy_content(struct elfcopy *ecp)
+{
+ struct section *s;
+
+ TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
+ /* Skip pseudo section. */
+ if (s->pseudo)
+ continue;
+
+ /* Skip special sections. */
+ if (strcmp(s->name, ".symtab") == 0 ||
+ strcmp(s->name, ".strtab") == 0 ||
+ strcmp(s->name, ".shstrtab") == 0)
+ continue;
+
+ /*
+ * If strip action is STRIP_ALL, relocation info need
+ * to be stripped. Skip filtering otherwisw.
+ */
+ if (ecp->strip == STRIP_ALL &&
+ (s->type == SHT_REL || s->type == SHT_RELA))
+ filter_reloc(ecp, s);
+
+ if (is_modify_section(ecp, s->name))
+ modify_section(ecp, s);
+
+ copy_data(s);
+
+ /*
+ * If symbol table is modified, relocation info might
+ * need update, as symbol index may have changed.
+ */
+ if ((ecp->flags & SYMTAB_INTACT) == 0 &&
+ (ecp->flags & SYMTAB_EXIST) &&
+ (s->type == SHT_REL || s->type == SHT_RELA))
+ update_reloc(ecp, s);
+
+ if (is_print_section(ecp, s->name))
+ print_section(s);
+ }
+}
+
+/*
+ * Filter relocation entries, only keep those entries whose
+ * symbol is in the keep list.
+ */
+static void
+filter_reloc(struct elfcopy *ecp, struct section *s)
+{
+ const char *name;
+ GElf_Shdr ish;
+ GElf_Rel rel;
+ GElf_Rela rela;
+ Elf32_Rel *rel32;
+ Elf64_Rel *rel64;
+ Elf32_Rela *rela32;
+ Elf64_Rela *rela64;
+ Elf_Data *id;
+ uint64_t cap, n, nrels;
+ int elferr, i;
+
+ if (gelf_getshdr(s->is, &ish) == NULL)
+ errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
+ elf_errmsg(-1));
+
+ /* We don't want to touch relocation info for dynamic symbols. */
+ if ((ecp->flags & SYMTAB_EXIST) == 0) {
+ if (ish.sh_link == 0 || ecp->secndx[ish.sh_link] == 0) {
+ /*
+ * This reloc section applies to the symbol table
+ * that was stripped, so discard whole section.
+ */
+ s->nocopy = 1;
+ s->sz = 0;
+ }
+ return;
+ } else {
+ /* Symbol table exist, check if index equals. */
+ if (ish.sh_link != elf_ndxscn(ecp->symtab->is))
+ return;
+ }
+
+#define COPYREL(REL, SZ) do { \
+ if (nrels == 0) { \
+ if ((REL##SZ = malloc(cap * \
+ sizeof(Elf##SZ##_Rel))) == NULL) \
+ err(EXIT_FAILURE, "malloc failed"); \
+ } \
+ if (nrels >= cap) { \
+ cap *= 2; \
+ if ((REL##SZ = realloc(REL##SZ, cap * \
+ sizeof(Elf##SZ##_Rel))) == NULL) \
+ err(EXIT_FAILURE, "realloc failed"); \
+ } \
+ REL##SZ[nrels].r_offset = REL.r_offset; \
+ REL##SZ[nrels].r_info = REL.r_info; \
+ if (s->type == SHT_RELA) \
+ rela##SZ[nrels].r_addend = rela.r_addend; \
+ nrels++; \
+} while (0)
+
+ nrels = 0;
+ cap = 4; /* keep list is usually small. */
+ rel32 = NULL;
+ rel64 = NULL;
+ rela32 = NULL;
+ rela64 = NULL;
+ if ((id = elf_getdata(s->is, NULL)) == NULL)
+ errx(EXIT_FAILURE, "elf_getdata() failed: %s",
+ elf_errmsg(-1));
+ n = ish.sh_size / ish.sh_entsize;
+ for(i = 0; (uint64_t)i < n; i++) {
+ if (s->type == SHT_REL) {
+ if (gelf_getrel(id, i, &rel) != &rel)
+ errx(EXIT_FAILURE, "gelf_getrel failed: %s",
+ elf_errmsg(-1));
+ } else {
+ if (gelf_getrela(id, i, &rela) != &rela)
+ errx(EXIT_FAILURE, "gelf_getrel failed: %s",
+ elf_errmsg(-1));
+ }
+ name = elf_strptr(ecp->ein, elf_ndxscn(ecp->strtab->is),
+ GELF_R_SYM(rel.r_info));
+ if (name == NULL)
+ errx(EXIT_FAILURE, "elf_strptr failed: %s",
+ elf_errmsg(-1));
+ if (lookup_symop_list(ecp, name, SYMOP_KEEP) != NULL) {
+ if (ecp->oec == ELFCLASS32) {
+ if (s->type == SHT_REL)
+ COPYREL(rel, 32);
+ else
+ COPYREL(rela, 32);
+ } else {
+ if (s->type == SHT_REL)
+ COPYREL(rel, 64);
+ else
+ COPYREL(rela, 64);
+ }
+ }
+ }
+ elferr = elf_errno();
+ if (elferr != 0)
+ errx(EXIT_FAILURE, "elf_getdata() failed: %s",
+ elf_errmsg(elferr));
+
+ if (ecp->oec == ELFCLASS32) {
+ if (s->type == SHT_REL)
+ s->buf = rel32;
+ else
+ s->buf = rela32;
+ } else {
+ if (s->type == SHT_REL)
+ s->buf = rel64;
+ else
+ s->buf = rela64;
+ }
+ s->sz = gelf_fsize(ecp->eout, (s->type == SHT_REL ? ELF_T_REL :
+ ELF_T_RELA), nrels, EV_CURRENT);
+ s->nocopy = 1;
+}
+
+static void
+update_reloc(struct elfcopy *ecp, struct section *s)
+{
+ GElf_Shdr osh;
+ GElf_Rel rel;
+ GElf_Rela rela;
+ Elf_Data *od;
+ uint64_t n;
+ int i;
+
+#define UPDATEREL(REL) do { \
+ if (gelf_get##REL(od, i, &REL) != &REL) \
+ errx(EXIT_FAILURE, "gelf_get##REL failed: %s", \
+ elf_errmsg(-1)); \
+ REL.r_info = GELF_R_INFO(ecp->symndx[GELF_R_SYM(REL.r_info)], \
+ GELF_R_TYPE(REL.r_info)); \
+ if (!gelf_update_##REL(od, i, &REL)) \
+ errx(EXIT_FAILURE, "gelf_update_##REL failed: %s", \
+ elf_errmsg(-1)); \
+} while(0)
+
+ if (s->sz == 0)
+ return;
+ if (gelf_getshdr(s->os, &osh) == NULL)
+ errx(EXIT_FAILURE, "gelf_getehdr() failed: %s",
+ elf_errmsg(-1));
+ /* Only process .symtab reloc info. */
+ if (osh.sh_link != elf_ndxscn(ecp->symtab->is))
+ return;
+ if ((od = elf_getdata(s->os, NULL)) == NULL)
+ errx(EXIT_FAILURE, "elf_getdata() failed: %s",
+ elf_errmsg(-1));
+ n = osh.sh_size / osh.sh_entsize;
+ for(i = 0; (uint64_t)i < n; i++) {
+ if (s->type == SHT_REL)
+ UPDATEREL(rel);
+ else
+ UPDATEREL(rela);
+ }
+}
+
+static void
+pad_section(struct elfcopy *ecp, struct section *s)
+{
+ GElf_Shdr osh;
+ Elf_Data *od;
+
+ if (s == NULL || s->pad_sz == 0)
+ return;
+
+ if ((s->pad = malloc(s->pad_sz)) == NULL)
+ err(EXIT_FAILURE, "malloc failed");
+ memset(s->pad, ecp->fill, s->pad_sz);
+
+ /* Create a new Elf_Data to contain the padding bytes. */
+ if ((od = elf_newdata(s->os)) == NULL)
+ errx(EXIT_FAILURE, "elf_newdata() failed: %s",
+ elf_errmsg(-1));
+ od->d_align = 1;
+ od->d_off = s->sz;
+ od->d_buf = s->pad;
+ od->d_type = ELF_T_BYTE;
+ od->d_size = s->pad_sz;
+ od->d_version = EV_CURRENT;
+
+ /* Update section header. */
+ if (gelf_getshdr(s->os, &osh) == NULL)
+ errx(EXIT_FAILURE, "gelf_getshdr() failed: %s",
+ elf_errmsg(-1));
+ osh.sh_size = s->sz + s->pad_sz;
+ if (!gelf_update_shdr(s->os, &osh))
+ errx(EXIT_FAILURE, "elf_update_shdr failed: %s",
+ elf_errmsg(-1));
+}
+
+void
+resync_sections(struct elfcopy *ecp)
+{
+ struct section *s, *ps;
+ GElf_Shdr osh;
+ uint64_t off;
+ int first;
+
+ ps = NULL;
+ first = 1;
+ off = 0;
+ TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
+ if (first) {
+ off = s->off;
+ first = 0;
+ }
+
+ /* Align section offset. */
+ if (off <= s->off) {
+ if (!s->loadable)
+ s->off = roundup(off, s->align);
+ } else {
+ if (s->loadable)
+ warnx("moving loadable section,"
+ "is this intentional?");
+ s->off = roundup(off, s->align);
+ }
+
+ /* Calculate next section offset. */
+ off = s->off;
+ if (s->pseudo || (s->type != SHT_NOBITS && s->type != SHT_NULL))
+ off += s->sz;
+
+ if (s->pseudo) {
+ ps = NULL;
+ continue;
+ }
+
+ /* Count padding bytes added through --pad-to. */
+ if (s->pad_sz > 0)
+ off += s->pad_sz;
+
+ /* Update section header accordingly. */
+ if (gelf_getshdr(s->os, &osh) == NULL)
+ errx(EXIT_FAILURE, "gelf_getshdr() failed: %s",
+ elf_errmsg(-1));
+ osh.sh_addr = s->vma;
+ osh.sh_offset = s->off;
+ osh.sh_size = s->sz;
+ if (!gelf_update_shdr(s->os, &osh))
+ errx(EXIT_FAILURE, "elf_update_shdr failed: %s",
+ elf_errmsg(-1));
+
+ /* Add padding for previous section, if need. */
+ if (ps != NULL) {
+ if (ps->pad_sz > 0) {
+ /* Apply padding added by --pad-to. */
+ pad_section(ecp, ps);
+ } else if ((ecp->flags & GAP_FILL) &&
+ (ps->off + ps->sz < s->off)) {
+ /*
+ * Fill the gap between sections by padding
+ * the section with lower address.
+ */
+ ps->pad_sz = s->off - (ps->off + ps->sz);
+ pad_section(ecp, ps);
+ }
+ }
+
+ ps = s;
+ }
+
+ /* Pad the last section, if need. */
+ if (ps != NULL && ps->pad_sz > 0)
+ pad_section(ecp, ps);
+}
+
+static void
+modify_section(struct elfcopy *ecp, struct section *s)
+{
+ struct sec_action *sac;
+ size_t srcsz, dstsz, p, len;
+ char *b, *c, *d, *src, *end;
+ int dupe;
+
+ src = read_section(s, &srcsz);
+ if (src == NULL || srcsz == 0) {
+ /* For empty section, we proceed if we need to append. */
+ if (!is_append_section(ecp, s->name))
+ return;
+ }
+
+ /* Allocate buffer needed for new section data. */
+ dstsz = srcsz;
+ if (is_append_section(ecp, s->name)) {
+ sac = lookup_sec_act(ecp, s->name, 0);
+ dstsz += strlen(sac->string) + 1;
+ }
+ if ((b = malloc(dstsz)) == NULL)
+ err(EXIT_FAILURE, "malloc failed");
+ s->buf = b;
+
+ /* Compress section. */
+ p = 0;
+ if (is_compress_section(ecp, s->name)) {
+ end = src + srcsz;
+ for(c = src; c < end;) {
+ len = 0;
+ while(c + len < end && c[len] != '\0')
+ len++;
+ if (c + len == end) {
+ /* XXX should we warn here? */
+ strncpy(&b[p], c, len);
+ p += len;
+ break;
+ }
+ dupe = 0;
+ for (d = b; d < b + p; ) {
+ if (strcmp(d, c) == 0) {
+ dupe = 1;
+ break;
+ }
+ d += strlen(d) + 1;
+ }
+ if (!dupe) {
+ strncpy(&b[p], c, len);
+ b[p + len] = '\0';
+ p += len + 1;
+ }
+ c += len + 1;
+ }
+ } else {
+ memcpy(b, src, srcsz);
+ p += srcsz;
+ }
+
+ /* Append section. */
+ if (is_append_section(ecp, s->name)) {
+ sac = lookup_sec_act(ecp, s->name, 0);
+ len = strlen(sac->string);
+ strncpy(&b[p], sac->string, len);
+ b[p + len] = '\0';
+ p += len + 1;
+ }
+
+ s->sz = p;
+ s->nocopy = 1;
+}
+
+static void
+print_data(const char *d, size_t sz)
+{
+ const char *c;
+
+ for (c = d; c < d + sz; c++) {
+ if (*c == '\0')
+ putchar('\n');
+ else
+ putchar(*c);
+ }
+}
+
+static void
+print_section(struct section *s)
+{
+ Elf_Data *id;
+ int elferr;
+
+ if (s->buf != NULL && s->sz > 0) {
+ print_data(s->buf, s->sz);
+ } else {
+ id = NULL;
+ while ((id = elf_getdata(s->is, id)) != NULL)
+ print_data(id->d_buf, id->d_size);
+ elferr = elf_errno();
+ if (elferr != 0)
+ errx(EXIT_FAILURE, "elf_getdata() failed: %s",
+ elf_errmsg(elferr));
+ }
+ putchar('\n');
+}
+
+static void *
+read_section(struct section *s, size_t *size)
+{
+ Elf_Data *id;
+ char *b;
+ size_t sz;
+ int elferr;
+
+ sz = 0;
+ b = NULL;
+ id = NULL;
+ while ((id = elf_getdata(s->is, id)) != NULL) {
+ if (b == NULL)
+ b = malloc(id->d_size);
+ else
+ b = malloc(sz + id->d_size);
+ if (b == NULL)
+ err(EXIT_FAILURE, "malloc or realloc failed");
+
+ memcpy(&b[sz], id->d_buf, id->d_size);
+ sz += id->d_size;
+ }
+ elferr = elf_errno();
+ if (elferr != 0)
+ errx(EXIT_FAILURE, "elf_getdata() failed: %s",
+ elf_errmsg(elferr));
+
+ *size = sz;
+
+ return (b);
+}
+
+void
+copy_shdr(struct elfcopy *ecp, struct section *s, const char *name, int copy,
+ int sec_flags)
+{
+ GElf_Shdr ish, osh;
+
+ if (gelf_getshdr(s->is, &ish) == NULL)
+ errx(EXIT_FAILURE, "526 gelf_getshdr() failed: %s",
+ elf_errmsg(-1));
+ if (gelf_getshdr(s->os, &osh) == NULL)
+ errx(EXIT_FAILURE, "529 gelf_getshdr() failed: %s",
+ elf_errmsg(-1));
+
+ if (copy)
+ (void) memcpy(&osh, &ish, sizeof(ish));
+ else {
+ osh.sh_type = s->type;
+ osh.sh_addr = s->vma;
+ osh.sh_offset = s->off;
+ osh.sh_size = s->sz;
+ osh.sh_link = ish.sh_link;
+ osh.sh_info = ish.sh_info;
+ osh.sh_addralign = s->align;
+ osh.sh_entsize = ish.sh_entsize;
+
+ if (sec_flags) {
+ osh.sh_flags = 0;
+ if (sec_flags & SF_ALLOC) {
+ osh.sh_flags |= SHF_ALLOC;
+ if (!s->loadable)
+ warnx("set SHF_ALLOC flag for "
+ "unloadable section %s",
+ s->name);
+ }
+ if ((sec_flags & SF_READONLY) == 0)
+ osh.sh_flags |= SHF_WRITE;
+ if (sec_flags & SF_CODE)
+ osh.sh_flags |= SHF_EXECINSTR;
+ } else
+ osh.sh_flags = ish.sh_flags;
+ }
+
+ if (name == NULL)
+ add_to_shstrtab(ecp, s->name);
+ else
+ add_to_shstrtab(ecp, name);
+
+ if (!gelf_update_shdr(s->os, &osh))
+ errx(EXIT_FAILURE, "elf_update_shdr failed: %s",
+ elf_errmsg(-1));
+}
+
+void
+copy_data(struct section *s)
+{
+ Elf_Data *id, *od;
+ int elferr;
+
+ if (s->nocopy && s->buf == NULL)
+ return;
+
+ if ((id = elf_getdata(s->is, NULL)) == NULL) {
+ elferr = elf_errno();
+ if (elferr != 0)
+ errx(EXIT_FAILURE, "elf_getdata() failed: %s",
+ elf_errmsg(elferr));
+ return;
+ }
+
+ if ((od = elf_newdata(s->os)) == NULL)
+ errx(EXIT_FAILURE, "elf_newdata() failed: %s",
+ elf_errmsg(-1));
+
+ if (s->nocopy) {
+ /* Use s->buf as content if s->nocopy is set. */
+ od->d_align = id->d_align;
+ od->d_off = 0;
+ od->d_buf = s->buf;
+ od->d_type = id->d_type;
+ od->d_size = s->sz;
+ od->d_version = id->d_version;
+ } else {
+ od->d_align = id->d_align;
+ od->d_off = id->d_off;
+ od->d_buf = id->d_buf;
+ od->d_type = id->d_type;
+ od->d_size = id->d_size;
+ od->d_version = id->d_version;
+ }
+}
+
+struct section *
+create_external_section(struct elfcopy *ecp, const char *name, char *newname,
+ void *buf, uint64_t size, uint64_t off, uint64_t stype, Elf_Type dtype,
+ uint64_t flags, uint64_t align, uint64_t vma, int loadable)
+{
+ struct section *s;
+ Elf_Scn *os;
+ Elf_Data *od;
+ GElf_Shdr osh;
+
+ if ((os = elf_newscn(ecp->eout)) == NULL)
+ errx(EXIT_FAILURE, "elf_newscn() failed: %s",
+ elf_errmsg(-1));
+ if ((s = calloc(1, sizeof(*s))) == NULL)
+ err(EXIT_FAILURE, "calloc failed");
+ s->name = name;
+ s->newname = newname; /* needs to be free()'ed */
+ s->off = off;
+ s->sz = size;
+ s->vma = vma;
+ s->align = align;
+ s->loadable = loadable;
+ s->is = NULL;
+ s->os = os;
+ s->type = stype;
+ s->nocopy = 1;
+ insert_to_sec_list(ecp, s, 1);
+
+ if (gelf_getshdr(os, &osh) == NULL)
+ errx(EXIT_FAILURE, "gelf_getshdr() failed: %s",
+ elf_errmsg(-1));
+ osh.sh_flags = flags;
+ osh.sh_type = s->type;
+ osh.sh_addr = s->vma;
+ osh.sh_addralign = s->align;
+ if (!gelf_update_shdr(os, &osh))
+ errx(EXIT_FAILURE, "gelf_update_shdr() failed: %s",
+ elf_errmsg(-1));
+ add_to_shstrtab(ecp, name);
+
+ if (buf != NULL && size != 0) {
+ if ((od = elf_newdata(os)) == NULL)
+ errx(EXIT_FAILURE, "elf_newdata() failed: %s",
+ elf_errmsg(-1));
+ od->d_align = align;
+ od->d_off = 0;
+ od->d_buf = buf;
+ od->d_size = size;
+ od->d_type = dtype;
+ od->d_version = EV_CURRENT;
+ }
+
+ /*
+ * Clear SYMTAB_INTACT, as we probably need to update/add new
+ * STT_SECTION symbols into the symbol table.
+ */
+ ecp->flags &= ~SYMTAB_INTACT;
+
+ return (s);
+}
+
+/*
+ * Insert sections specified by --add-section to the end of section list.
+ */
+static void
+insert_sections(struct elfcopy *ecp)
+{
+ struct sec_add *sa;
+ struct section *s;
+ size_t off;
+
+ /* Put these sections in the end of current list. */
+ off = 0;
+ TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
+ if (s->type != SHT_NOBITS && s->type != SHT_NULL)
+ off = s->off + s->sz;
+ else
+ off = s->off;
+ }
+
+ STAILQ_FOREACH(sa, &ecp->v_sadd, sadd_list) {
+
+ /* TODO: Add section header vma/lma, flag changes here */
+
+ (void) create_external_section(ecp, sa->name, NULL, sa->content,
+ sa->size, off, SHT_PROGBITS, ELF_T_BYTE, 0, 1, 0, 0);
+ }
+}
+
+void
+add_to_shstrtab(struct elfcopy *ecp, const char *name)
+{
+ struct section *s;
+
+ s = ecp->shstrtab;
+ if (s->buf == NULL) {
+ insert_to_strtab(s, "");
+ insert_to_strtab(s, ".symtab");
+ insert_to_strtab(s, ".strtab");
+ insert_to_strtab(s, ".shstrtab");
+ }
+ insert_to_strtab(s, name);
+}
+
+void
+update_shdr(struct elfcopy *ecp, int update_link)
+{
+ struct section *s;
+ GElf_Shdr osh;
+ int elferr;
+
+ TAILQ_FOREACH(s, &ecp->v_sec, sec_list) {
+ if (s->pseudo)
+ continue;
+
+ if (gelf_getshdr(s->os, &osh) == NULL)
+ errx(EXIT_FAILURE, "668 gelf_getshdr failed: %s",
+ elf_errmsg(-1));
+
+ /* Find section name in string table and set sh_name. */
+ osh.sh_name = lookup_string(ecp->shstrtab, s->name);
+
+ /*
+ * sh_link needs to be updated, since the index of the
+ * linked section might have changed.
+ */
+ if (update_link && osh.sh_link != 0)
+ osh.sh_link = ecp->secndx[osh.sh_link];
+
+ /*
+ * sh_info of relocation section links to the section to which
+ * its relocation info applies. So it may need update as well.
+ */
+ if ((s->type == SHT_REL || s->type == SHT_RELA) &&
+ osh.sh_info != 0)
+ osh.sh_info = ecp->secndx[osh.sh_info];
+
+ if (!gelf_update_shdr(s->os, &osh))
+ errx(EXIT_FAILURE, "gelf_update_shdr() failed: %s",
+ elf_errmsg(-1));
+ }
+ elferr = elf_errno();
+ if (elferr != 0)
+ errx(EXIT_FAILURE, "elf_nextscn failed: %s",
+ elf_errmsg(elferr));
+}
+
+void
+init_shstrtab(struct elfcopy *ecp)
+{
+ struct section *s;
+
+ if ((ecp->shstrtab = calloc(1, sizeof(*ecp->shstrtab))) == NULL)
+ err(EXIT_FAILURE, "calloc failed");
+ s = ecp->shstrtab;
+ s->name = ".shstrtab";
+ s->is = NULL;
+ s->sz = 0;
+ s->align = 1;
+ s->loadable = 0;
+ s->type = SHT_STRTAB;
+ s->vma = 0;
+}
+
+void
+set_shstrtab(struct elfcopy *ecp)
+{
+ struct section *s;
+ Elf_Data *data;
+ GElf_Shdr sh;
+
+ s = ecp->shstrtab;
+
+ if (gelf_getshdr(s->os, &sh) == NULL)
+ errx(EXIT_FAILURE, "692 gelf_getshdr() failed: %s",
+ elf_errmsg(-1));
+ sh.sh_addr = 0;
+ sh.sh_addralign = 1;
+ sh.sh_offset = s->off;
+ sh.sh_type = SHT_STRTAB;
+ sh.sh_flags = 0;
+ sh.sh_entsize = 0;
+ sh.sh_info = 0;
+ sh.sh_link = 0;
+
+ if ((data = elf_newdata(s->os)) == NULL)
+ errx(EXIT_FAILURE, "elf_newdata() failed: %s",
+ elf_errmsg(-1));
+
+ /*
+ * If we don't have a symbol table, skip those a few bytes
+ * which are reserved for this in the beginning of shstrtab.
+ */
+ if (!(ecp->flags & SYMTAB_EXIST)) {
+ s->sz -= sizeof(".symtab\0.strtab");
+ memmove(s->buf, (char *)s->buf + sizeof(".symtab\0.strtab"),
+ s->sz);
+ }
+
+ sh.sh_size = s->sz;
+ if (!gelf_update_shdr(s->os, &sh))
+ errx(EXIT_FAILURE, "gelf_update_shdr() failed: %s",
+ elf_errmsg(-1));
+
+ data->d_align = 1;
+ data->d_buf = s->buf;
+ data->d_size = s->sz;
+ data->d_off = 0;
+ data->d_type = ELF_T_BYTE;
+ data->d_version = EV_CURRENT;
+
+ if (!elf_setshstrndx(ecp->eout, elf_ndxscn(s->os)))
+ errx(EXIT_FAILURE, "elf_setshstrndx() failed: %s",
+ elf_errmsg(-1));
+}
+
+void
+add_section(struct elfcopy *ecp, const char *arg)
+{
+ struct sec_add *sa;
+ struct stat sb;
+ const char *s, *fn;
+ FILE *fp;
+ int len;
+
+ if ((s = strchr(arg, '=')) == NULL)
+ errx(EXIT_FAILURE,
+ "illegal format for --add-section option");
+ if ((sa = malloc(sizeof(*sa))) == NULL)
+ err(EXIT_FAILURE, "malloc failed");
+
+ len = s - arg;
+ if ((sa->name = malloc(len + 1)) == NULL)
+ err(EXIT_FAILURE, "malloc failed");
+ strncpy(sa->name, arg, len);
+ sa->name[len] = '\0';
+
+ fn = s + 1;
+ if (stat(fn, &sb) == -1)
+ err(EXIT_FAILURE, "stat failed");
+ sa->size = sb.st_size;
+ if ((sa->content = malloc(sa->size)) == NULL)
+ err(EXIT_FAILURE, "malloc failed");
+ if ((fp = fopen(fn, "r")) == NULL)
+ err(EXIT_FAILURE, "can not open %s", fn);
+ if (fread(sa->content, 1, sa->size, fp) == 0 ||
+ ferror(fp))
+ err(EXIT_FAILURE, "fread failed");
+ fclose(fp);
+
+ STAILQ_INSERT_TAIL(&ecp->v_sadd, sa, sadd_list);
+ ecp->flags |= SEC_ADD;
+}
+
+void
+free_sec_add(struct elfcopy *ecp)
+{
+ struct sec_add *sa, *sa_temp;
+
+ STAILQ_FOREACH_SAFE(sa, &ecp->v_sadd, sadd_list, sa_temp) {
+ STAILQ_REMOVE(&ecp->v_sadd, sa, sec_add, sadd_list);
+ free(sa->name);
+ free(sa->content);
+ free(sa);
+ }
+}
+
+static void
+add_gnu_debuglink(struct elfcopy *ecp)
+{
+ struct sec_add *sa;
+ struct stat sb;
+ FILE *fp;
+ char *fnbase, *buf;
+ int crc_off;
+ int crc;
+
+ if (ecp->debuglink == NULL)
+ return;
+
+ /* Read debug file content. */
+ if ((sa = malloc(sizeof(*sa))) == NULL)
+ err(EXIT_FAILURE, "malloc failed");
+ if ((sa->name = strdup(".gnu_debuglink")) == NULL)
+ err(EXIT_FAILURE, "strdup failed");
+ if (stat(ecp->debuglink, &sb) == -1)
+ err(EXIT_FAILURE, "stat failed");
+ if ((buf = malloc(sb.st_size)) == NULL)
+ err(EXIT_FAILURE, "malloc failed");
+ if ((fp = fopen(ecp->debuglink, "r")) == NULL)
+ err(EXIT_FAILURE, "can not open %s", ecp->debuglink);
+ if (fread(buf, 1, sb.st_size, fp) == 0 ||
+ ferror(fp))
+ err(EXIT_FAILURE, "fread failed");
+ fclose(fp);
+
+ /* Calculate crc checksum. */
+ crc = calc_crc32(buf, sb.st_size, 0xFFFFFFFF);
+ free(buf);
+
+ /* Calculate section size and the offset to store crc checksum. */
+ if ((fnbase = basename(ecp->debuglink)) == NULL)
+ err(EXIT_FAILURE, "basename failed");
+ crc_off = roundup(strlen(fnbase) + 1, 4);
+ sa->size = crc_off + 4;
+
+ /* Section content. */
+ if ((sa->content = calloc(1, sa->size)) == NULL)
+ err(EXIT_FAILURE, "malloc failed");
+ strncpy(sa->content, fnbase, strlen(fnbase));
+ if (ecp->oed == ELFDATA2LSB) {
+ sa->content[crc_off] = crc & 0xFF;
+ sa->content[crc_off + 1] = (crc >> 8) & 0xFF;
+ sa->content[crc_off + 2] = (crc >> 16) & 0xFF;
+ sa->content[crc_off + 3] = crc >> 24;
+ } else {
+ sa->content[crc_off] = crc >> 24;
+ sa->content[crc_off + 1] = (crc >> 16) & 0xFF;
+ sa->content[crc_off + 2] = (crc >> 8) & 0xFF;
+ sa->content[crc_off + 3] = crc & 0xFF;
+ }
+
+ STAILQ_INSERT_TAIL(&ecp->v_sadd, sa, sadd_list);
+ ecp->flags |= SEC_ADD;
+}
+
+static void
+insert_to_strtab(struct section *t, const char *s)
+{
+ const char *r;
+ char *b, *c;
+ size_t len, slen;
+ int append;
+
+ if (t->sz == 0) {
+ t->cap = 512;
+ if ((t->buf = malloc(t->cap)) == NULL)
+ err(EXIT_FAILURE, "malloc failed");
+ }
+
+ slen = strlen(s);
+ append = 0;
+ b = t->buf;
+ for (c = b; c < b + t->sz;) {
+ len = strlen(c);
+ if (!append && len >= slen) {
+ r = c + (len - slen);
+ if (strcmp(r, s) == 0)
+ return;
+ } else if (len < slen && len != 0) {
+ r = s + (slen - len);
+ if (strcmp(c, r) == 0) {
+ t->sz -= len + 1;
+ memmove(c, c + len + 1, t->sz - (c - b));
+ append = 1;
+ continue;
+ }
+ }
+ c += len + 1;
+ }
+
+ while (t->sz + slen + 1 >= t->cap) {
+ t->cap *= 2;
+ if ((t->buf = realloc(t->buf, t->cap)) == NULL)
+ err(EXIT_FAILURE, "realloc failed");
+ }
+ b = t->buf;
+ strncpy(&b[t->sz], s, slen);
+ b[t->sz + slen] = '\0';
+ t->sz += slen + 1;
+}
+
+static int
+lookup_string(struct section *t, const char *s)
+{
+ const char *b, *c, *r;
+ size_t len, slen;
+
+ slen = strlen(s);
+ b = t->buf;
+ for (c = b; c < b + t->sz;) {
+ len = strlen(c);
+ if (len >= slen) {
+ r = c + (len - slen);
+ if (strcmp(r, s) == 0)
+ return (r - b);
+ }
+ c += len + 1;
+ }
+
+ return (-1);
+}
+
+static uint32_t crctable[256] =
+{
+ 0x00000000L, 0x77073096L, 0xEE0E612CL, 0x990951BAL,
+ 0x076DC419L, 0x706AF48FL, 0xE963A535L, 0x9E6495A3L,
+ 0x0EDB8832L, 0x79DCB8A4L, 0xE0D5E91EL, 0x97D2D988L,
+ 0x09B64C2BL, 0x7EB17CBDL, 0xE7B82D07L, 0x90BF1D91L,
+ 0x1DB71064L, 0x6AB020F2L, 0xF3B97148L, 0x84BE41DEL,
+ 0x1ADAD47DL, 0x6DDDE4EBL, 0xF4D4B551L, 0x83D385C7L,
+ 0x136C9856L, 0x646BA8C0L, 0xFD62F97AL, 0x8A65C9ECL,
+ 0x14015C4FL, 0x63066CD9L, 0xFA0F3D63L, 0x8D080DF5L,
+ 0x3B6E20C8L, 0x4C69105EL, 0xD56041E4L, 0xA2677172L,
+ 0x3C03E4D1L, 0x4B04D447L, 0xD20D85FDL, 0xA50AB56BL,
+ 0x35B5A8FAL, 0x42B2986CL, 0xDBBBC9D6L, 0xACBCF940L,
+ 0x32D86CE3L, 0x45DF5C75L, 0xDCD60DCFL, 0xABD13D59L,
+ 0x26D930ACL, 0x51DE003AL, 0xC8D75180L, 0xBFD06116L,
+ 0x21B4F4B5L, 0x56B3C423L, 0xCFBA9599L, 0xB8BDA50FL,
+ 0x2802B89EL, 0x5F058808L, 0xC60CD9B2L, 0xB10BE924L,
+ 0x2F6F7C87L, 0x58684C11L, 0xC1611DABL, 0xB6662D3DL,
+ 0x76DC4190L, 0x01DB7106L, 0x98D220BCL, 0xEFD5102AL,
+ 0x71B18589L, 0x06B6B51FL, 0x9FBFE4A5L, 0xE8B8D433L,
+ 0x7807C9A2L, 0x0F00F934L, 0x9609A88EL, 0xE10E9818L,
+ 0x7F6A0DBBL, 0x086D3D2DL, 0x91646C97L, 0xE6635C01L,
+ 0x6B6B51F4L, 0x1C6C6162L, 0x856530D8L, 0xF262004EL,
+ 0x6C0695EDL, 0x1B01A57BL, 0x8208F4C1L, 0xF50FC457L,
+ 0x65B0D9C6L, 0x12B7E950L, 0x8BBEB8EAL, 0xFCB9887CL,
+ 0x62DD1DDFL, 0x15DA2D49L, 0x8CD37CF3L, 0xFBD44C65L,
+ 0x4DB26158L, 0x3AB551CEL, 0xA3BC0074L, 0xD4BB30E2L,
+ 0x4ADFA541L, 0x3DD895D7L, 0xA4D1C46DL, 0xD3D6F4FBL,
+ 0x4369E96AL, 0x346ED9FCL, 0xAD678846L, 0xDA60B8D0L,
+ 0x44042D73L, 0x33031DE5L, 0xAA0A4C5FL, 0xDD0D7CC9L,
+ 0x5005713CL, 0x270241AAL, 0xBE0B1010L, 0xC90C2086L,
+ 0x5768B525L, 0x206F85B3L, 0xB966D409L, 0xCE61E49FL,
+ 0x5EDEF90EL, 0x29D9C998L, 0xB0D09822L, 0xC7D7A8B4L,
+ 0x59B33D17L, 0x2EB40D81L, 0xB7BD5C3BL, 0xC0BA6CADL,
+ 0xEDB88320L, 0x9ABFB3B6L, 0x03B6E20CL, 0x74B1D29AL,
+ 0xEAD54739L, 0x9DD277AFL, 0x04DB2615L, 0x73DC1683L,
+ 0xE3630B12L, 0x94643B84L, 0x0D6D6A3EL, 0x7A6A5AA8L,
+ 0xE40ECF0BL, 0x9309FF9DL, 0x0A00AE27L, 0x7D079EB1L,
+ 0xF00F9344L, 0x8708A3D2L, 0x1E01F268L, 0x6906C2FEL,
+ 0xF762575DL, 0x806567CBL, 0x196C3671L, 0x6E6B06E7L,
+ 0xFED41B76L, 0x89D32BE0L, 0x10DA7A5AL, 0x67DD4ACCL,
+ 0xF9B9DF6FL, 0x8EBEEFF9L, 0x17B7BE43L, 0x60B08ED5L,
+ 0xD6D6A3E8L, 0xA1D1937EL, 0x38D8C2C4L, 0x4FDFF252L,
+ 0xD1BB67F1L, 0xA6BC5767L, 0x3FB506DDL, 0x48B2364BL,
+ 0xD80D2BDAL, 0xAF0A1B4CL, 0x36034AF6L, 0x41047A60L,
+ 0xDF60EFC3L, 0xA867DF55L, 0x316E8EEFL, 0x4669BE79L,
+ 0xCB61B38CL, 0xBC66831AL, 0x256FD2A0L, 0x5268E236L,
+ 0xCC0C7795L, 0xBB0B4703L, 0x220216B9L, 0x5505262FL,
+ 0xC5BA3BBEL, 0xB2BD0B28L, 0x2BB45A92L, 0x5CB36A04L,
+ 0xC2D7FFA7L, 0xB5D0CF31L, 0x2CD99E8BL, 0x5BDEAE1DL,
+ 0x9B64C2B0L, 0xEC63F226L, 0x756AA39CL, 0x026D930AL,
+ 0x9C0906A9L, 0xEB0E363FL, 0x72076785L, 0x05005713L,
+ 0x95BF4A82L, 0xE2B87A14L, 0x7BB12BAEL, 0x0CB61B38L,
+ 0x92D28E9BL, 0xE5D5BE0DL, 0x7CDCEFB7L, 0x0BDBDF21L,
+ 0x86D3D2D4L, 0xF1D4E242L, 0x68DDB3F8L, 0x1FDA836EL,
+ 0x81BE16CDL, 0xF6B9265BL, 0x6FB077E1L, 0x18B74777L,
+ 0x88085AE6L, 0xFF0F6A70L, 0x66063BCAL, 0x11010B5CL,
+ 0x8F659EFFL, 0xF862AE69L, 0x616BFFD3L, 0x166CCF45L,
+ 0xA00AE278L, 0xD70DD2EEL, 0x4E048354L, 0x3903B3C2L,
+ 0xA7672661L, 0xD06016F7L, 0x4969474DL, 0x3E6E77DBL,
+ 0xAED16A4AL, 0xD9D65ADCL, 0x40DF0B66L, 0x37D83BF0L,
+ 0xA9BCAE53L, 0xDEBB9EC5L, 0x47B2CF7FL, 0x30B5FFE9L,
+ 0xBDBDF21CL, 0xCABAC28AL, 0x53B39330L, 0x24B4A3A6L,
+ 0xBAD03605L, 0xCDD70693L, 0x54DE5729L, 0x23D967BFL,
+ 0xB3667A2EL, 0xC4614AB8L, 0x5D681B02L, 0x2A6F2B94L,
+ 0xB40BBE37L, 0xC30C8EA1L, 0x5A05DF1BL, 0x2D02EF8DL
+};
+
+static uint32_t
+calc_crc32(const char *p, size_t len, uint32_t crc)
+{
+ uint32_t i;
+
+ for (i = 0; i < len; i++) {
+ crc = crctable[(crc ^ *p++) & 0xFFL] ^ (crc >> 8);
+ }
+
+ return (crc ^ 0xFFFFFFFF);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-09 17:27:10 +0000