src/zipcmp.c - third_party/libzip - Git at Google

 /*
   zipcmp.c -- compare zip files
   Copyright (C) 2003-2020 Dieter Baron and Thomas Klausner

   This file is part of libzip, a library to manipulate ZIP archives.
   The authors can be contacted at <libzip@nih.at>

   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.
   3. The names of the authors may not be used to endorse or promote
      products derived from this software without specific prior
      written permission.

   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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 "config.h"

 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 #ifdef HAVE_STRINGS_H
 #include <strings.h>
 #endif
 #ifdef HAVE_FTS_H
 #include <fts.h>
 #endif
 #include <zlib.h>

 #ifndef HAVE_GETOPT
 #include "getopt.h"
 #endif

 #include "zip.h"

 #include "compat.h"

 struct archive {
     const char *name;
     zip_t *za;
     zip_uint64_t nentry;
     struct entry *entry;
     const char *comment;
     size_t comment_length;
 };

 struct ef {
     const char *name;
     zip_uint16_t flags;
     zip_uint16_t id;
     zip_uint16_t size;
     const zip_uint8_t *data;
 };

 struct entry {
     char *name;
     zip_uint64_t size;
     zip_uint32_t crc;
     zip_uint32_t comp_method;
     struct ef *extra_fields;
     zip_uint16_t n_extra_fields;
     const char *comment;
     zip_uint32_t comment_length;
 };


 const char *progname;

 #define PROGRAM "zipcmp"

 #define USAGE "usage: %s [-hipqtVv] archive1 archive2\n"

 char help_head[] = PROGRAM " (" PACKAGE ") by Dieter Baron and Thomas Klausner\n\n";

 char help[] = "\n\
   -h       display this help message\n\
   -C       check archive consistencies\n\
   -i       compare names ignoring case distinctions\n\
   -p       compare as many details as possible\n\
   -q       be quiet\n\
   -t       test zip files (compare file contents to checksum)\n\
   -V       display version number\n\
   -v       be verbose (print differences, default)\n\
 \n\
 Report bugs to <libzip@nih.at>.\n";

 char version_string[] = PROGRAM " (" PACKAGE " " VERSION ")\n\
 Copyright (C) 2003-2020 Dieter Baron and Thomas Klausner\n\
 " PACKAGE " comes with ABSOLUTELY NO WARRANTY, to the extent permitted by law.\n";

 #define OPTIONS "hVCipqtv"


 #define BOTH_ARE_ZIPS(a) (a[0].za && a[1].za)

 static int comment_compare(const char *c1, size_t l1, const char *c2, size_t l2);
 static int compare_list(char *const name[], const void *l[], const zip_uint64_t n[], int size, int (*cmp)(const void *, const void *), int (*ignore)(const void *l, int last, const void *o), int (*checks)(char *const name[2], const void *, const void *), void (*print)(const void *));
 static int compare_zip(char *const zn[]);
 static int ef_compare(char *const name[2], const struct entry *e1, const struct entry *e2);
 static int ef_order(const void *a, const void *b);
 static void ef_print(const void *p);
 static int ef_read(zip_t *za, zip_uint64_t idx, struct entry *e);
 static int entry_cmp(const void *p1, const void *p2);
 static int entry_ignore(const void *p1, int last, const void *o);
 static int entry_paranoia_checks(char *const name[2], const void *p1, const void *p2);
 static void entry_print(const void *p);
 static int is_directory(const char *name);
 #ifdef HAVE_FTS_H
 static int list_directory(const char *name, struct archive *a);
 #endif
 static int list_zip(const char *name, struct archive *a);
 static int test_file(zip_t *za, zip_uint64_t idx, const char *zipname, const char *filename, zip_uint64_t size, zip_uint32_t crc);

 int ignore_case, test_files, paranoid, verbose, have_directory, check_consistency;
 int header_done;


 int
 main(int argc, char *const argv[]) {
     int c;

     progname = argv[0];

     ignore_case = 0;
     test_files = 0;
     check_consistency = 0;
     paranoid = 0;
     have_directory = 0;
     verbose = 1;

     while ((c = getopt(argc, argv, OPTIONS)) != -1) {
         switch (c) {
             case 'C':
                 check_consistency = 1;
                 break;
             case 'i':
                 ignore_case = 1;
                 break;
             case 'p':
                 paranoid = 1;
                 break;
             case 'q':
                 verbose = 0;
                 break;
             case 't':
                 test_files = 1;
                 break;
             case 'v':
                 verbose = 1;
                 break;

             case 'h':
                 fputs(help_head, stdout);
                 printf(USAGE, progname);
                 fputs(help, stdout);
                 exit(0);
             case 'V':
                 fputs(version_string, stdout);
                 exit(0);

             default:
                 fprintf(stderr, USAGE, progname);
                 exit(2);
         }
     }

     if (argc != optind + 2) {
         fprintf(stderr, USAGE, progname);
         exit(2);
     }

     exit((compare_zip(argv + optind) == 0) ? 0 : 1);
 }


 static int
 compare_zip(char *const zn[]) {
     struct archive a[2];
     struct entry *e[2];
     zip_uint64_t n[2];
     int i;
     int res;

     for (i = 0; i < 2; i++) {
         a[i].name = zn[i];
         a[i].entry = NULL;
         a[i].nentry = 0;
         a[i].za = NULL;
         a[i].comment = NULL;
         a[i].comment_length = 0;

         if (is_directory(zn[i])) {
 #ifndef HAVE_FTS_H
             fprintf(stderr, "%s: reading directories not supported\n", progname);
             exit(2);
 #else
             if (list_directory(zn[i], a + i) < 0)
                 exit(2);
             have_directory = 1;
             paranoid = 0; /* paranoid checks make no sense for directories, since they compare zip metadata */
 #endif
         }
         else {
             if (list_zip(zn[i], a + i) < 0)
                 exit(2);
         }
         if (a[i].nentry > 0)
             qsort(a[i].entry, a[i].nentry, sizeof(a[i].entry[0]), entry_cmp);
     }

     header_done = 0;

     e[0] = a[0].entry;
     e[1] = a[1].entry;
     n[0] = a[0].nentry;
     n[1] = a[1].nentry;
     res = compare_list(zn, (const void **)e, n, sizeof(e[i][0]), entry_cmp, have_directory ? entry_ignore : NULL, paranoid ? entry_paranoia_checks : NULL, entry_print);

     if (paranoid) {
         if (comment_compare(a[0].comment, a[0].comment_length, a[1].comment, a[1].comment_length) != 0) {
             if (verbose) {
                 printf("--- archive comment (%zu)\n", a[0].comment_length);
                 printf("+++ archive comment (%zu)\n", a[1].comment_length);
             }
             res = 1;
         }
     }

     for (i = 0; i < 2; i++) {
         zip_uint64_t j;

         if (a[i].za) {
             zip_close(a[i].za);
         }
         for (j = 0; j < a[i].nentry; j++) {
             free(a[i].entry[j].name);
         }
         free(a[i].entry);
     }

     switch (res) {
     case 0:
         exit(0);

     case 1:
         exit(1);

     default:
         exit(2);
     }
 }

 #ifdef HAVE_FTS_H
 static zip_int64_t
 compute_crc(const char *fname) {
     FILE *f;
     uLong crc = crc32(0L, Z_NULL, 0);
     size_t n;
     Bytef buffer[8192];


     if ((f = fopen(fname, "rb")) == NULL) {
         fprintf(stderr, "%s: can't open %s: %s\n", progname, fname, strerror(errno));
         return -1;
     }

     while ((n = fread(buffer, 1, sizeof(buffer), f)) > 0) {
         crc = crc32(crc, buffer, (unsigned int)n);
     }

     if (ferror(f)) {
         fprintf(stderr, "%s: read error on %s: %s\n", progname, fname, strerror(errno));
         fclose(f);
         return -1;
     }

     fclose(f);

     return (zip_int64_t)crc;
 }
 #endif


 static int
 is_directory(const char *name) {
     struct stat st;

     if (stat(name, &st) < 0)
         return 0;

     return S_ISDIR(st.st_mode);
 }


 #ifdef HAVE_FTS_H
 static int
 list_directory(const char *name, struct archive *a) {
     FTS *fts;
     FTSENT *ent;
     zip_uint64_t nalloc;
     size_t prefix_length;

     char *const names[2] = {(char *)name, NULL};


     if ((fts = fts_open(names, FTS_NOCHDIR | FTS_LOGICAL, NULL)) == NULL) {
         fprintf(stderr, "%s: can't open directory '%s': %s\n", progname, name, strerror(errno));
         return -1;
     }
     prefix_length = strlen(name) + 1;

     nalloc = 0;

     while ((ent = fts_read(fts))) {
         zip_int64_t crc;

         switch (ent->fts_info) {
             case FTS_DOT:
             case FTS_DP:
             case FTS_DEFAULT:
             case FTS_SL:
             case FTS_NSOK:
                 break;

             case FTS_DC:
             case FTS_DNR:
             case FTS_ERR:
             case FTS_NS:
             case FTS_SLNONE:
                 /* TODO: error */
                 fts_close(fts);
                 return -1;

             case FTS_D:
             case FTS_F:
                 if (a->nentry >= nalloc) {
                     nalloc += 16;
                     if (nalloc > SIZE_MAX / sizeof(a->entry[0])) {
                         fprintf(stderr, "%s: malloc failure\n", progname);
                         exit(1);
                     }
                     a->entry = realloc(a->entry, sizeof(a->entry[0]) * nalloc);
                     if (a->entry == NULL) {
                         fprintf(stderr, "%s: malloc failure\n", progname);
                         exit(1);
                     }
                 }

                 if (ent->fts_info == FTS_D) {
                     char *dir_name;

                     if (ent->fts_path[prefix_length - 1] == '\0') {
                         break;
                     }

                     dir_name = malloc(strlen(ent->fts_path + prefix_length) + 2);
                     if (dir_name == NULL) {
                         fprintf(stderr, "%s: malloc failure\n", progname);
                         exit(1);
                     }
                     sprintf(dir_name, "%s/", ent->fts_path + prefix_length);
                     a->entry[a->nentry].name = dir_name;
                     a->entry[a->nentry].size = 0;
                     a->entry[a->nentry].crc = 0;
                 }
                 else {
                     a->entry[a->nentry].name = strdup(ent->fts_path + prefix_length);
                     a->entry[a->nentry].size = (zip_uint64_t)ent->fts_statp->st_size;
                     if ((crc = compute_crc(ent->fts_accpath)) < 0) {
                         fts_close(fts);
                         return -1;
                     }

                     a->entry[a->nentry].crc = (zip_uint32_t)crc;
                 }
                 a->nentry++;
                 break;
         }
     }

     if (fts_close(fts)) {
         fprintf(stderr, "%s: error closing directory '%s': %s\n", progname, a->name, strerror(errno));
         return -1;
     }

     return 0;
 }
 #endif


 static int
 list_zip(const char *name, struct archive *a) {
     zip_t *za;
     int err;
     struct zip_stat st;
     unsigned int i;

     if ((za = zip_open(name, check_consistency ? ZIP_CHECKCONS : 0, &err)) == NULL) {
         zip_error_t error;
         zip_error_init_with_code(&error, err);
         fprintf(stderr, "%s: cannot open zip archive '%s': %s\n", progname, name, zip_error_strerror(&error));
         zip_error_fini(&error);
         return -1;
     }

     a->za = za;
     a->nentry = (zip_uint64_t)zip_get_num_entries(za, 0);

     if (a->nentry == 0)
         a->entry = NULL;
     else {
         if ((a->nentry > SIZE_MAX / sizeof(a->entry[0])) || (a->entry = (struct entry *)malloc(sizeof(a->entry[0]) * a->nentry)) == NULL) {
             fprintf(stderr, "%s: malloc failure\n", progname);
             exit(1);
         }

         for (i = 0; i < a->nentry; i++) {
             zip_stat_index(za, i, 0, &st);
             a->entry[i].name = strdup(st.name);
             a->entry[i].size = st.size;
             a->entry[i].crc = st.crc;
             if (test_files)
                 test_file(za, i, name, st.name, st.size, st.crc);
             if (paranoid) {
                 a->entry[i].comp_method = st.comp_method;
                 ef_read(za, i, a->entry + i);
                 a->entry[i].comment = zip_file_get_comment(za, i, &a->entry[i].comment_length, 0);
             }
             else {
                 a->entry[i].comp_method = 0;
                 a->entry[i].n_extra_fields = 0;
             }
         }

         if (paranoid) {
             int length;
             a->comment = zip_get_archive_comment(za, &length, 0);
             a->comment_length = (size_t)length;
         }
         else {
             a->comment = NULL;
             a->comment_length = 0;
         }
     }

     return 0;
 }


 static int
 comment_compare(const char *c1, size_t l1, const char *c2, size_t l2) {
     if (l1 != l2)
         return 1;

     if (l1 == 0)
         return 0;

     if (c1 == NULL || c2 == NULL)
         return c1 == c2;

     return memcmp(c1, c2, (size_t)l2);
 }


 static int
 compare_list(char *const name[2], const void *l[2], const zip_uint64_t n[2], int size, int (*cmp)(const void *, const void *), int (*ignore)(const void *l, int last, const void *o), int (*check)(char *const name[2], const void *, const void *), void (*print)(const void *)) {
     unsigned int i[2];
     int j, c;
     int diff;

 #define INC(k) (i[k]++, l[k] = ((const char *)l[k]) + size)
 #define PRINT(k)                                          \
     do {                                                  \
         if (ignore && ignore(l[k], i[k] >= n[k] - 1, i[1-k] < n[1-k] ? l[1-k] : NULL)) {   \
             break;                                        \
         }                                                 \
         if (header_done == 0 && verbose) {                \
             printf("--- %s\n+++ %s\n", name[0], name[1]); \
             header_done = 1;                              \
         }                                                 \
         if (verbose) {                                    \
             printf("%c ", (k) ? '+' : '-');               \
             print(l[k]);                                  \
         }                                                 \
         diff = 1;                                         \
     } while (0)

     i[0] = i[1] = 0;
     diff = 0;
     while (i[0] < n[0] && i[1] < n[1]) {
         c = cmp(l[0], l[1]);

         if (c == 0) {
             if (check)
                 diff |= check(name, l[0], l[1]);
             INC(0);
             INC(1);
         }
         else if (c < 0) {
             PRINT(0);
             INC(0);
         }
         else {
             PRINT(1);
             INC(1);
         }
     }

     for (j = 0; j < 2; j++) {
         while (i[j] < n[j]) {
             PRINT(j);
             INC(j);
         }
     }

     return diff;
 }


 static int
 ef_read(zip_t *za, zip_uint64_t idx, struct entry *e) {
     zip_int16_t n_local, n_central;
     zip_uint16_t i;

     if ((n_local = zip_file_extra_fields_count(za, idx, ZIP_FL_LOCAL)) < 0 || (n_central = zip_file_extra_fields_count(za, idx, ZIP_FL_CENTRAL)) < 0) {
         return -1;
     }

     e->n_extra_fields = (zip_uint16_t)(n_local + n_central);

     if ((e->extra_fields = (struct ef *)malloc(sizeof(e->extra_fields[0]) * e->n_extra_fields)) == NULL)
         return -1;

     for (i = 0; i < n_local; i++) {
         e->extra_fields[i].name = e->name;
         e->extra_fields[i].data = zip_file_extra_field_get(za, idx, i, &e->extra_fields[i].id, &e->extra_fields[i].size, ZIP_FL_LOCAL);
         if (e->extra_fields[i].data == NULL)
             return -1;
         e->extra_fields[i].flags = ZIP_FL_LOCAL;
     }
     for (; i < e->n_extra_fields; i++) {
         e->extra_fields[i].name = e->name;
         e->extra_fields[i].data = zip_file_extra_field_get(za, idx, (zip_uint16_t)(i - n_local), &e->extra_fields[i].id, &e->extra_fields[i].size, ZIP_FL_CENTRAL);
         if (e->extra_fields[i].data == NULL)
             return -1;
         e->extra_fields[i].flags = ZIP_FL_CENTRAL;
     }

     qsort(e->extra_fields, e->n_extra_fields, sizeof(e->extra_fields[0]), ef_order);

     return 0;
 }


 static int
 ef_compare(char *const name[2], const struct entry *e1, const struct entry *e2) {
     struct ef *ef[2];
     zip_uint64_t n[2];

     ef[0] = e1->extra_fields;
     ef[1] = e2->extra_fields;
     n[0] = e1->n_extra_fields;
     n[1] = e2->n_extra_fields;

     return compare_list(name, (const void **)ef, n, sizeof(struct ef), ef_order, NULL, NULL, ef_print);
 }


 static int
 ef_order(const void *ap, const void *bp) {
     const struct ef *a, *b;

     a = (struct ef *)ap;
     b = (struct ef *)bp;

     if (a->flags != b->flags)
         return a->flags - b->flags;
     if (a->id != b->id)
         return a->id - b->id;
     if (a->size != b->size)
         return a->size - b->size;
     return memcmp(a->data, b->data, a->size);
 }


 static void
 ef_print(const void *p) {
     const struct ef *ef = (struct ef *)p;
     int i;

     printf("                    %s  ", ef->name);
     printf("%04x %c <", ef->id, ef->flags == ZIP_FL_LOCAL ? 'l' : 'c');
     for (i = 0; i < ef->size; i++)
         printf("%s%02x", i ? " " : "", ef->data[i]);
     printf(">\n");
 }


 static int
 entry_cmp(const void *p1, const void *p2) {
     const struct entry *e1, *e2;
     int c;

     e1 = (struct entry *)p1;
     e2 = (struct entry *)p2;

     if ((c = (ignore_case ? strcasecmp : strcmp)(e1->name, e2->name)) != 0)
         return c;
     if (e1->size != e2->size) {
         if (e1->size > e2->size)
             return 1;
         else
             return -1;
     }
     if (e1->crc != e2->crc)
         return (int)e1->crc - (int)e2->crc;

     return 0;
 }


 static int
 entry_ignore(const void *p, int last, const void *o) {
     const struct entry *e = (const struct entry *)p;
     const struct entry *other = (const struct entry *)o;

     size_t length = strlen(e[0].name);

     if (length == 0 || e[0].name[length - 1] != '/') {
         /* not a directory */
         return 0;
     }

     if (other != NULL && strlen(other->name) > length && strncmp(other->name, e[0].name, length) == 0) {
         /* not empty in other archive */
         return 1;
     }

     if (last || (strlen(e[1].name) < length || strncmp(e[0].name, e[1].name, length) != 0)) {
         /* empty in this archive */
         return 0;
     }

     /* not empty in this archive */
     return 1;
 }


 static int
 entry_paranoia_checks(char *const name[2], const void *p1, const void *p2) {
     const struct entry *e1, *e2;
     int ret;

     e1 = (struct entry *)p1;
     e2 = (struct entry *)p2;

     ret = 0;

     if (ef_compare(name, e1, e2) != 0)
         ret = 1;

     if (e1->comp_method != e2->comp_method) {
         if (verbose) {
             if (header_done == 0) {
                 printf("--- %s\n+++ %s\n", name[0], name[1]);
                 header_done = 1;
             }
             printf("---                     %s  ", e1->name);
             printf("method %u\n", e1->comp_method);
             printf("+++                     %s  ", e1->name);
             printf("method %u\n", e2->comp_method);
         }
         ret = 1;
     }
     if (comment_compare(e1->comment, e1->comment_length, e2->comment, e2->comment_length) != 0) {
         if (verbose) {
             if (header_done == 0) {
                 printf("--- %s\n+++ %s\n", name[0], name[1]);
                 header_done = 1;
             }
             printf("---                     %s  ", e1->name);
             printf("comment %" PRIu32 "\n", e1->comment_length);
             printf("+++                     %s  ", e1->name);
             printf("comment %" PRIu32 "\n", e2->comment_length);
         }
         ret = 1;
     }

     return ret;
 }


 static void
 entry_print(const void *p) {
     const struct entry *e;

     e = (struct entry *)p;

     /* TODO PRId64 */
     printf("%10lu %08x %s\n", (unsigned long)e->size, e->crc, e->name);
 }


 static int
 test_file(zip_t *za, zip_uint64_t idx, const char *zipname, const char *filename, zip_uint64_t size, zip_uint32_t crc) {
     zip_file_t *zf;
     char buf[8192];
     zip_uint64_t nsize;
     zip_int64_t n;
     zip_uint32_t ncrc;

     if ((zf = zip_fopen_index(za, idx, 0)) == NULL) {
         fprintf(stderr, "%s: %s: cannot open file %s (index %" PRIu64 "): %s\n", progname, zipname, filename, idx, zip_strerror(za));
         return -1;
     }

     ncrc = (zip_uint32_t)crc32(0, NULL, 0);
     nsize = 0;

     while ((n = zip_fread(zf, buf, sizeof(buf))) > 0) {
         nsize += (zip_uint64_t)n;
         ncrc = (zip_uint32_t)crc32(ncrc, (const Bytef *)buf, (unsigned int)n);
     }

     if (n < 0) {
         fprintf(stderr, "%s: %s: error reading file %s (index %" PRIu64 "): %s\n", progname, zipname, filename, idx, zip_file_strerror(zf));
         zip_fclose(zf);
         return -1;
     }

     zip_fclose(zf);

     if (nsize != size) {
         fprintf(stderr, "%s: %s: file %s (index %" PRIu64 "): unexpected length %" PRId64 " (should be %" PRId64 ")\n", progname, zipname, filename, idx, nsize, size);
         return -2;
     }
     if (ncrc != crc) {
         fprintf(stderr, "%s: %s: file %s (index %" PRIu64 "): unexpected length %x (should be %x)\n", progname, zipname, filename, idx, ncrc, crc);
         return -2;
     }

     return 0;
 }
	/*
	zipcmp.c -- compare zip files
	Copyright (C) 2003-2020 Dieter Baron and Thomas Klausner

	This file is part of libzip, a library to manipulate ZIP archives.
	The authors can be contacted at <libzip@nih.at>

	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.
	3. The names of the authors may not be used to endorse or promote
	products derived from this software without specific prior
	written permission.

	THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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 "config.h"

	#include <errno.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/stat.h>
	#ifdef HAVE_STRINGS_H
	#include <strings.h>
	#endif
	#ifdef HAVE_FTS_H
	#include <fts.h>
	#endif
	#include <zlib.h>

	#ifndef HAVE_GETOPT
	#include "getopt.h"
	#endif

	#include "zip.h"

	#include "compat.h"

	struct archive {
	const char *name;
	zip_t *za;
	zip_uint64_t nentry;
	struct entry *entry;
	const char *comment;
	size_t comment_length;
	};

	struct ef {
	const char *name;
	zip_uint16_t flags;
	zip_uint16_t id;
	zip_uint16_t size;
	const zip_uint8_t *data;
	};

	struct entry {
	char *name;
	zip_uint64_t size;
	zip_uint32_t crc;
	zip_uint32_t comp_method;
	struct ef *extra_fields;
	zip_uint16_t n_extra_fields;
	const char *comment;
	zip_uint32_t comment_length;
	};


	const char *progname;

	#define PROGRAM "zipcmp"

	#define USAGE "usage: %s [-hipqtVv] archive1 archive2\n"

	char help_head[] = PROGRAM " (" PACKAGE ") by Dieter Baron and Thomas Klausner\n\n";

	char help[] = "\n\
	-h display this help message\n\
	-C check archive consistencies\n\
	-i compare names ignoring case distinctions\n\
	-p compare as many details as possible\n\
	-q be quiet\n\
	-t test zip files (compare file contents to checksum)\n\
	-V display version number\n\
	-v be verbose (print differences, default)\n\
	\n\
	Report bugs to <libzip@nih.at>.\n";

	char version_string[] = PROGRAM " (" PACKAGE " " VERSION ")\n\
	Copyright (C) 2003-2020 Dieter Baron and Thomas Klausner\n\
	" PACKAGE " comes with ABSOLUTELY NO WARRANTY, to the extent permitted by law.\n";

	#define OPTIONS "hVCipqtv"


	#define BOTH_ARE_ZIPS(a) (a[0].za && a[1].za)

	static int comment_compare(const char c1, size_t l1, const char c2, size_t l2);
	static int compare_list(char const name[], const void l[], const zip_uint64_t n[], int size, int (cmp)(const void , const void ), int (ignore)(const void l, int last, const void o), int (checks)(char const name[2], const void , const void ), void (print)(const void ));
	static int compare_zip(char *const zn[]);
	static int ef_compare(char const name[2], const struct entry e1, const struct entry *e2);
	static int ef_order(const void a, const void b);
	static void ef_print(const void *p);
	static int ef_read(zip_t za, zip_uint64_t idx, struct entry e);
	static int entry_cmp(const void p1, const void p2);
	static int entry_ignore(const void p1, int last, const void o);
	static int entry_paranoia_checks(char const name[2], const void p1, const void *p2);
	static void entry_print(const void *p);
	static int is_directory(const char *name);
	#ifdef HAVE_FTS_H
	static int list_directory(const char name, struct archive a);
	#endif
	static int list_zip(const char name, struct archive a);
	static int test_file(zip_t za, zip_uint64_t idx, const char zipname, const char *filename, zip_uint64_t size, zip_uint32_t crc);

	int ignore_case, test_files, paranoid, verbose, have_directory, check_consistency;
	int header_done;


	int
	main(int argc, char *const argv[]) {
	int c;

	progname = argv[0];

	ignore_case = 0;
	test_files = 0;
	check_consistency = 0;
	paranoid = 0;
	have_directory = 0;
	verbose = 1;

	while ((c = getopt(argc, argv, OPTIONS)) != -1) {
	switch (c) {
	case 'C':
	check_consistency = 1;
	break;
	case 'i':
	ignore_case = 1;
	break;
	case 'p':
	paranoid = 1;
	break;
	case 'q':
	verbose = 0;
	break;
	case 't':
	test_files = 1;
	break;
	case 'v':
	verbose = 1;
	break;

	case 'h':
	fputs(help_head, stdout);
	printf(USAGE, progname);
	fputs(help, stdout);
	exit(0);
	case 'V':
	fputs(version_string, stdout);
	exit(0);

	default:
	fprintf(stderr, USAGE, progname);
	exit(2);
	}
	}

	if (argc != optind + 2) {
	fprintf(stderr, USAGE, progname);
	exit(2);
	}

	exit((compare_zip(argv + optind) == 0) ? 0 : 1);
	}


	static int
	compare_zip(char *const zn[]) {
	struct archive a[2];
	struct entry *e[2];
	zip_uint64_t n[2];
	int i;
	int res;

	for (i = 0; i < 2; i++) {
	a[i].name = zn[i];
	a[i].entry = NULL;
	a[i].nentry = 0;
	a[i].za = NULL;
	a[i].comment = NULL;
	a[i].comment_length = 0;

	if (is_directory(zn[i])) {
	#ifndef HAVE_FTS_H
	fprintf(stderr, "%s: reading directories not supported\n", progname);
	exit(2);
	#else
	if (list_directory(zn[i], a + i) < 0)
	exit(2);
	have_directory = 1;
	paranoid = 0; /* paranoid checks make no sense for directories, since they compare zip metadata */
	#endif
	}
	else {
	if (list_zip(zn[i], a + i) < 0)
	exit(2);
	}
	if (a[i].nentry > 0)
	qsort(a[i].entry, a[i].nentry, sizeof(a[i].entry[0]), entry_cmp);
	}

	header_done = 0;

	e[0] = a[0].entry;
	e[1] = a[1].entry;
	n[0] = a[0].nentry;
	n[1] = a[1].nentry;
	res = compare_list(zn, (const void **)e, n, sizeof(e[i][0]), entry_cmp, have_directory ? entry_ignore : NULL, paranoid ? entry_paranoia_checks : NULL, entry_print);

	if (paranoid) {
	if (comment_compare(a[0].comment, a[0].comment_length, a[1].comment, a[1].comment_length) != 0) {
	if (verbose) {
	printf("--- archive comment (%zu)\n", a[0].comment_length);
	printf("+++ archive comment (%zu)\n", a[1].comment_length);
	}
	res = 1;
	}
	}

	for (i = 0; i < 2; i++) {
	zip_uint64_t j;

	if (a[i].za) {
	zip_close(a[i].za);
	}
	for (j = 0; j < a[i].nentry; j++) {
	free(a[i].entry[j].name);
	}
	free(a[i].entry);
	}

	switch (res) {
	case 0:
	exit(0);

	case 1:
	exit(1);

	default:
	exit(2);
	}
	}

	#ifdef HAVE_FTS_H
	static zip_int64_t
	compute_crc(const char *fname) {
	FILE *f;
	uLong crc = crc32(0L, Z_NULL, 0);
	size_t n;
	Bytef buffer[8192];


	if ((f = fopen(fname, "rb")) == NULL) {
	fprintf(stderr, "%s: can't open %s: %s\n", progname, fname, strerror(errno));
	return -1;
	}

	while ((n = fread(buffer, 1, sizeof(buffer), f)) > 0) {
	crc = crc32(crc, buffer, (unsigned int)n);
	}

	if (ferror(f)) {
	fprintf(stderr, "%s: read error on %s: %s\n", progname, fname, strerror(errno));
	fclose(f);
	return -1;
	}

	fclose(f);

	return (zip_int64_t)crc;
	}
	#endif


	static int
	is_directory(const char *name) {
	struct stat st;

	if (stat(name, &st) < 0)
	return 0;

	return S_ISDIR(st.st_mode);
	}


	#ifdef HAVE_FTS_H
	static int
	list_directory(const char name, struct archive a) {
	FTS *fts;
	FTSENT *ent;
	zip_uint64_t nalloc;
	size_t prefix_length;

	char const names[2] = {(char )name, NULL};


	if ((fts = fts_open(names, FTS_NOCHDIR \| FTS_LOGICAL, NULL)) == NULL) {
	fprintf(stderr, "%s: can't open directory '%s': %s\n", progname, name, strerror(errno));
	return -1;
	}
	prefix_length = strlen(name) + 1;

	nalloc = 0;

	while ((ent = fts_read(fts))) {
	zip_int64_t crc;

	switch (ent->fts_info) {
	case FTS_DOT:
	case FTS_DP:
	case FTS_DEFAULT:
	case FTS_SL:
	case FTS_NSOK:
	break;

	case FTS_DC:
	case FTS_DNR:
	case FTS_ERR:
	case FTS_NS:
	case FTS_SLNONE:
	/* TODO: error */
	fts_close(fts);
	return -1;

	case FTS_D:
	case FTS_F:
	if (a->nentry >= nalloc) {
	nalloc += 16;
	if (nalloc > SIZE_MAX / sizeof(a->entry[0])) {
	fprintf(stderr, "%s: malloc failure\n", progname);
	exit(1);
	}
	a->entry = realloc(a->entry, sizeof(a->entry[0]) * nalloc);
	if (a->entry == NULL) {
	fprintf(stderr, "%s: malloc failure\n", progname);
	exit(1);
	}
	}

	if (ent->fts_info == FTS_D) {
	char *dir_name;

	if (ent->fts_path[prefix_length - 1] == '\0') {
	break;
	}

	dir_name = malloc(strlen(ent->fts_path + prefix_length) + 2);
	if (dir_name == NULL) {
	fprintf(stderr, "%s: malloc failure\n", progname);
	exit(1);
	}
	sprintf(dir_name, "%s/", ent->fts_path + prefix_length);
	a->entry[a->nentry].name = dir_name;
	a->entry[a->nentry].size = 0;
	a->entry[a->nentry].crc = 0;
	}
	else {
	a->entry[a->nentry].name = strdup(ent->fts_path + prefix_length);
	a->entry[a->nentry].size = (zip_uint64_t)ent->fts_statp->st_size;
	if ((crc = compute_crc(ent->fts_accpath)) < 0) {
	fts_close(fts);
	return -1;
	}

	a->entry[a->nentry].crc = (zip_uint32_t)crc;
	}
	a->nentry++;
	break;
	}
	}

	if (fts_close(fts)) {
	fprintf(stderr, "%s: error closing directory '%s': %s\n", progname, a->name, strerror(errno));
	return -1;
	}

	return 0;
	}
	#endif


	static int
	list_zip(const char name, struct archive a) {
	zip_t *za;
	int err;
	struct zip_stat st;
	unsigned int i;

	if ((za = zip_open(name, check_consistency ? ZIP_CHECKCONS : 0, &err)) == NULL) {
	zip_error_t error;
	zip_error_init_with_code(&error, err);
	fprintf(stderr, "%s: cannot open zip archive '%s': %s\n", progname, name, zip_error_strerror(&error));
	zip_error_fini(&error);
	return -1;
	}

	a->za = za;
	a->nentry = (zip_uint64_t)zip_get_num_entries(za, 0);

	if (a->nentry == 0)
	a->entry = NULL;
	else {
	if ((a->nentry > SIZE_MAX / sizeof(a->entry[0])) \|\| (a->entry = (struct entry )malloc(sizeof(a->entry[0]) a->nentry)) == NULL) {
	fprintf(stderr, "%s: malloc failure\n", progname);
	exit(1);
	}

	for (i = 0; i < a->nentry; i++) {
	zip_stat_index(za, i, 0, &st);
	a->entry[i].name = strdup(st.name);
	a->entry[i].size = st.size;
	a->entry[i].crc = st.crc;
	if (test_files)
	test_file(za, i, name, st.name, st.size, st.crc);
	if (paranoid) {
	a->entry[i].comp_method = st.comp_method;
	ef_read(za, i, a->entry + i);
	a->entry[i].comment = zip_file_get_comment(za, i, &a->entry[i].comment_length, 0);
	}
	else {
	a->entry[i].comp_method = 0;
	a->entry[i].n_extra_fields = 0;
	}
	}

	if (paranoid) {
	int length;
	a->comment = zip_get_archive_comment(za, &length, 0);
	a->comment_length = (size_t)length;
	}
	else {
	a->comment = NULL;
	a->comment_length = 0;
	}
	}

	return 0;
	}


	static int
	comment_compare(const char c1, size_t l1, const char c2, size_t l2) {
	if (l1 != l2)
	return 1;

	if (l1 == 0)
	return 0;

	if (c1 == NULL \|\| c2 == NULL)
	return c1 == c2;

	return memcmp(c1, c2, (size_t)l2);
	}


	static int
	compare_list(char const name[2], const void l[2], const zip_uint64_t n[2], int size, int (cmp)(const void , const void ), int (ignore)(const void l, int last, const void o), int (check)(char const name[2], const void , const void ), void (print)(const void )) {
	unsigned int i[2];
	int j, c;
	int diff;

	#define INC(k) (i[k]++, l[k] = ((const char *)l[k]) + size)
	#define PRINT(k) \
	do { \
	if (ignore && ignore(l[k], i[k] >= n[k] - 1, i[1-k] < n[1-k] ? l[1-k] : NULL)) { \
	break; \
	} \
	if (header_done == 0 && verbose) { \
	printf("--- %s\n+++ %s\n", name[0], name[1]); \
	header_done = 1; \
	} \
	if (verbose) { \
	printf("%c ", (k) ? '+' : '-'); \
	print(l[k]); \
	} \
	diff = 1; \
	} while (0)

	i[0] = i[1] = 0;
	diff = 0;
	while (i[0] < n[0] && i[1] < n[1]) {
	c = cmp(l[0], l[1]);

	if (c == 0) {
	if (check)
	diff \|= check(name, l[0], l[1]);
	INC(0);
	INC(1);
	}
	else if (c < 0) {
	PRINT(0);
	INC(0);
	}
	else {
	PRINT(1);
	INC(1);
	}
	}

	for (j = 0; j < 2; j++) {
	while (i[j] < n[j]) {
	PRINT(j);
	INC(j);
	}
	}

	return diff;
	}


	static int
	ef_read(zip_t za, zip_uint64_t idx, struct entry e) {
	zip_int16_t n_local, n_central;
	zip_uint16_t i;

	if ((n_local = zip_file_extra_fields_count(za, idx, ZIP_FL_LOCAL)) < 0 \|\| (n_central = zip_file_extra_fields_count(za, idx, ZIP_FL_CENTRAL)) < 0) {
	return -1;
	}

	e->n_extra_fields = (zip_uint16_t)(n_local + n_central);

	if ((e->extra_fields = (struct ef )malloc(sizeof(e->extra_fields[0]) e->n_extra_fields)) == NULL)
	return -1;

	for (i = 0; i < n_local; i++) {
	e->extra_fields[i].name = e->name;
	e->extra_fields[i].data = zip_file_extra_field_get(za, idx, i, &e->extra_fields[i].id, &e->extra_fields[i].size, ZIP_FL_LOCAL);
	if (e->extra_fields[i].data == NULL)
	return -1;
	e->extra_fields[i].flags = ZIP_FL_LOCAL;
	}
	for (; i < e->n_extra_fields; i++) {
	e->extra_fields[i].name = e->name;
	e->extra_fields[i].data = zip_file_extra_field_get(za, idx, (zip_uint16_t)(i - n_local), &e->extra_fields[i].id, &e->extra_fields[i].size, ZIP_FL_CENTRAL);
	if (e->extra_fields[i].data == NULL)
	return -1;
	e->extra_fields[i].flags = ZIP_FL_CENTRAL;
	}

	qsort(e->extra_fields, e->n_extra_fields, sizeof(e->extra_fields[0]), ef_order);

	return 0;
	}


	static int
	ef_compare(char const name[2], const struct entry e1, const struct entry *e2) {
	struct ef *ef[2];
	zip_uint64_t n[2];

	ef[0] = e1->extra_fields;
	ef[1] = e2->extra_fields;
	n[0] = e1->n_extra_fields;
	n[1] = e2->n_extra_fields;

	return compare_list(name, (const void **)ef, n, sizeof(struct ef), ef_order, NULL, NULL, ef_print);
	}


	static int
	ef_order(const void ap, const void bp) {
	const struct ef a, b;

	a = (struct ef *)ap;
	b = (struct ef *)bp;

	if (a->flags != b->flags)
	return a->flags - b->flags;
	if (a->id != b->id)
	return a->id - b->id;
	if (a->size != b->size)
	return a->size - b->size;
	return memcmp(a->data, b->data, a->size);
	}


	static void
	ef_print(const void *p) {
	const struct ef ef = (struct ef )p;
	int i;

	printf(" %s ", ef->name);
	printf("%04x %c <", ef->id, ef->flags == ZIP_FL_LOCAL ? 'l' : 'c');
	for (i = 0; i < ef->size; i++)
	printf("%s%02x", i ? " " : "", ef->data[i]);
	printf(">\n");
	}


	static int
	entry_cmp(const void p1, const void p2) {
	const struct entry e1, e2;
	int c;

	e1 = (struct entry *)p1;
	e2 = (struct entry *)p2;

	if ((c = (ignore_case ? strcasecmp : strcmp)(e1->name, e2->name)) != 0)
	return c;
	if (e1->size != e2->size) {
	if (e1->size > e2->size)
	return 1;
	else
	return -1;
	}
	if (e1->crc != e2->crc)
	return (int)e1->crc - (int)e2->crc;

	return 0;
	}


	static int
	entry_ignore(const void p, int last, const void o) {
	const struct entry e = (const struct entry )p;
	const struct entry other = (const struct entry )o;

	size_t length = strlen(e[0].name);

	if (length == 0 \|\| e[0].name[length - 1] != '/') {
	/* not a directory */
	return 0;
	}

	if (other != NULL && strlen(other->name) > length && strncmp(other->name, e[0].name, length) == 0) {
	/* not empty in other archive */
	return 1;
	}

	if (last \|\| (strlen(e[1].name) < length \|\| strncmp(e[0].name, e[1].name, length) != 0)) {
	/* empty in this archive */
	return 0;
	}

	/* not empty in this archive */
	return 1;
	}


	static int
	entry_paranoia_checks(char const name[2], const void p1, const void *p2) {
	const struct entry e1, e2;
	int ret;

	e1 = (struct entry *)p1;
	e2 = (struct entry *)p2;

	ret = 0;

	if (ef_compare(name, e1, e2) != 0)
	ret = 1;

	if (e1->comp_method != e2->comp_method) {
	if (verbose) {
	if (header_done == 0) {
	printf("--- %s\n+++ %s\n", name[0], name[1]);
	header_done = 1;
	}
	printf("--- %s ", e1->name);
	printf("method %u\n", e1->comp_method);
	printf("+++ %s ", e1->name);
	printf("method %u\n", e2->comp_method);
	}
	ret = 1;
	}
	if (comment_compare(e1->comment, e1->comment_length, e2->comment, e2->comment_length) != 0) {
	if (verbose) {
	if (header_done == 0) {
	printf("--- %s\n+++ %s\n", name[0], name[1]);
	header_done = 1;
	}
	printf("--- %s ", e1->name);
	printf("comment %" PRIu32 "\n", e1->comment_length);
	printf("+++ %s ", e1->name);
	printf("comment %" PRIu32 "\n", e2->comment_length);
	}
	ret = 1;
	}

	return ret;
	}


	static void
	entry_print(const void *p) {
	const struct entry *e;

	e = (struct entry *)p;

	/* TODO PRId64 */
	printf("%10lu %08x %s\n", (unsigned long)e->size, e->crc, e->name);
	}


	static int
	test_file(zip_t za, zip_uint64_t idx, const char zipname, const char *filename, zip_uint64_t size, zip_uint32_t crc) {
	zip_file_t *zf;
	char buf[8192];
	zip_uint64_t nsize;
	zip_int64_t n;
	zip_uint32_t ncrc;

	if ((zf = zip_fopen_index(za, idx, 0)) == NULL) {
	fprintf(stderr, "%s: %s: cannot open file %s (index %" PRIu64 "): %s\n", progname, zipname, filename, idx, zip_strerror(za));
	return -1;
	}

	ncrc = (zip_uint32_t)crc32(0, NULL, 0);
	nsize = 0;

	while ((n = zip_fread(zf, buf, sizeof(buf))) > 0) {
	nsize += (zip_uint64_t)n;
	ncrc = (zip_uint32_t)crc32(ncrc, (const Bytef *)buf, (unsigned int)n);
	}

	if (n < 0) {
	fprintf(stderr, "%s: %s: error reading file %s (index %" PRIu64 "): %s\n", progname, zipname, filename, idx, zip_file_strerror(zf));
	zip_fclose(zf);
	return -1;
	}

	zip_fclose(zf);

	if (nsize != size) {
	fprintf(stderr, "%s: %s: file %s (index %" PRIu64 "): unexpected length %" PRId64 " (should be %" PRId64 ")\n", progname, zipname, filename, idx, nsize, size);
	return -2;
	}
	if (ncrc != crc) {
	fprintf(stderr, "%s: %s: file %s (index %" PRIu64 "): unexpected length %x (should be %x)\n", progname, zipname, filename, idx, ncrc, crc);
	return -2;
	}

	return 0;
	}