Add support for writing multiple file formats

Previous implementation sent too many bytes to decompressor if size was
less than 1024.

CMakeLists.txt

@@ -83,7 +83,6 @@ add_executable(test_simplearchiver
     src/test.c
     src/parser.c
     src/helpers.c
-    src/archiver.c
     src/algorithms/linear_congruential_gen.c
     src/data_structures/linked_list.c
     src/data_structures/hash_map.c

file_format.md

@@ -118,16 +118,8 @@ Following the link-count bytes, the following bytes are added for each symlink:
     1. The first byte.
         1. The first bit is UNSET if relative links are preferred, and is SET if
            absolute links are preferred.
-        2. The second bit is "user read permission".
-        3. The third bit is "user write permission".
-        4. The fourth bit is "user execute permission".
-        5. The fifth bit is "group read permission".
-        6. The sixth bit is "group write permission".
-        7. The seventh bit is "group execute permission".
-        8. The eighth bit is "other read permission".
     2. The second byte.
-        1. The first bit is "other write permission".
-        2. The second bit is "other execute permission".
+        1. Currently unused.
 2. 2 bytes 16-bit unsigned integer "link name" in big-endian. This does not
    include the NULL at the end of the string. Must not be zero.
 3. X bytes of link-name (length defined by previous value). Is a NULL-terminated

src/archiver.c

@@ -767,8 +767,46 @@ int write_files_fn(void *data, void *ud) {
         // fprintf(stderr, "DEBUG: abs_path: %s\nDEBUG: link_abs_path: %s\n",
         //                 (char*)abs_path, (char*)link_abs_path);
 
-        rel_path =
-            simple_archiver_filenames_to_relative_path(link_abs_path, abs_path);
+        // Compare paths to get relative path.
+        // Get first non-common char.
+        size_t idx;
+        size_t last_slash;
+        for (idx = 0, last_slash = 0;
+             idx < strlen(abs_path) && idx < strlen(link_abs_path); ++idx) {
+          if (((const char *)abs_path)[idx] !=
+              ((const char *)link_abs_path)[idx]) {
+            break;
+          } else if (((const char *)abs_path)[idx] == '/') {
+            last_slash = idx + 1;
+          }
+        }
+        // Get substrings of both paths.
+        char *link_substr = (char *)link_abs_path + last_slash;
+        char *dest_substr = (char *)abs_path + last_slash;
+        rel_path = malloc(strlen(dest_substr) + 1);
+        strncpy(rel_path, dest_substr, strlen(dest_substr) + 1);
+        // fprintf(stderr, "DEBUG: link_substr: %s\nDEBUG: dest_substr: %s\n",
+        //         link_substr, dest_substr);
+
+        // Generate the relative path.
+        int_fast8_t has_slash = 0;
+        idx = 0;
+        do {
+          for (; link_substr[idx] != '/' && link_substr[idx] != 0; ++idx);
+          if (link_substr[idx] == 0) {
+            has_slash = 0;
+          } else {
+            has_slash = 1;
+            char *new_rel_path = malloc(strlen(rel_path) + 1 + 3);
+            new_rel_path[0] = '.';
+            new_rel_path[1] = '.';
+            new_rel_path[2] = '/';
+            strncpy(new_rel_path + 3, rel_path, strlen(rel_path) + 1);
+            free(rel_path);
+            rel_path = new_rel_path;
+            ++idx;
+          }
+        } while (has_slash);
       }
     }
 
@@ -1112,86 +1150,6 @@ void cleanup_internal_file_info(SDArchiverInternalFileInfo **file_info) {
 #if SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_COSMOPOLITAN || \
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_MAC ||          \
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_LINUX
-mode_t permissions_from_bits_v1_symlink(const uint8_t flags[2],
-                                        uint_fast8_t print) {
-  mode_t permissions = 0;
-
-  if ((flags[0] & 2) != 0) {
-    permissions |= S_IRUSR;
-    if (print) {
-      fprintf(stderr, "r");
-    }
-  } else if (print) {
-    fprintf(stderr, "-");
-  }
-  if ((flags[0] & 4) != 0) {
-    permissions |= S_IWUSR;
-    if (print) {
-      fprintf(stderr, "w");
-    }
-  } else if (print) {
-    fprintf(stderr, "-");
-  }
-  if ((flags[0] & 8) != 0) {
-    permissions |= S_IXUSR;
-    if (print) {
-      fprintf(stderr, "x");
-    }
-  } else if (print) {
-    fprintf(stderr, "-");
-  }
-  if ((flags[0] & 0x10) != 0) {
-    permissions |= S_IRGRP;
-    if (print) {
-      fprintf(stderr, "r");
-    }
-  } else if (print) {
-    fprintf(stderr, "-");
-  }
-  if ((flags[0] & 0x20) != 0) {
-    permissions |= S_IWGRP;
-    if (print) {
-      fprintf(stderr, "w");
-    }
-  } else if (print) {
-    fprintf(stderr, "-");
-  }
-  if ((flags[0] & 0x40) != 0) {
-    permissions |= S_IXGRP;
-    if (print) {
-      fprintf(stderr, "x");
-    }
-  } else if (print) {
-    fprintf(stderr, "-");
-  }
-  if ((flags[0] & 0x80) != 0) {
-    permissions |= S_IROTH;
-    if (print) {
-      fprintf(stderr, "r");
-    }
-  } else if (print) {
-    fprintf(stderr, "-");
-  }
-  if ((flags[1] & 1) != 0) {
-    permissions |= S_IWOTH;
-    if (print) {
-      fprintf(stderr, "w");
-    }
-  } else if (print) {
-    fprintf(stderr, "-");
-  }
-  if ((flags[1] & 2) != 0) {
-    permissions |= S_IXOTH;
-    if (print) {
-      fprintf(stderr, "x");
-    }
-  } else if (print) {
-    fprintf(stderr, "-");
-  }
-
-  return permissions;
-}
-
 mode_t permissions_from_bits_version_1(const uint8_t flags[4],
                                        uint_fast8_t print) {
   mode_t permissions = 0;
@@ -1271,55 +1229,6 @@ mode_t permissions_from_bits_version_1(const uint8_t flags[4],
 
   return permissions;
 }
-
-void print_permissions(mode_t permissions) {
-  if ((permissions & S_IRUSR)) {
-    fprintf(stderr, "r");
-  } else {
-    fprintf(stderr, "-");
-  }
-  if ((permissions & S_IWUSR)) {
-    fprintf(stderr, "w");
-  } else {
-    fprintf(stderr, "-");
-  }
-  if ((permissions & S_IXUSR)) {
-    fprintf(stderr, "x");
-  } else {
-    fprintf(stderr, "-");
-  }
-  if ((permissions & S_IRGRP)) {
-    fprintf(stderr, "r");
-  } else {
-    fprintf(stderr, "-");
-  }
-  if ((permissions & S_IWGRP)) {
-    fprintf(stderr, "w");
-  } else {
-    fprintf(stderr, "-");
-  }
-  if ((permissions & S_IXGRP)) {
-    fprintf(stderr, "x");
-  } else {
-    fprintf(stderr, "-");
-  }
-  if ((permissions & S_IROTH)) {
-    fprintf(stderr, "r");
-  } else {
-    fprintf(stderr, "-");
-  }
-  if ((permissions & S_IWOTH)) {
-    fprintf(stderr, "w");
-  } else {
-    fprintf(stderr, "-");
-  }
-  if ((permissions & S_IXOTH)) {
-    fprintf(stderr, "x");
-  } else {
-    fprintf(stderr, "-");
-  }
-}
-
 #endif
 
 void simple_archiver_internal_cleanup_int_fd(int *fd) {
@@ -1580,18 +1489,6 @@ int simple_archiver_write_v0(FILE *out_f, SDArchiverState *state,
 
 int simple_archiver_write_v1(FILE *out_f, SDArchiverState *state,
                              const SDArchiverLinkedList *filenames) {
-  // First create a "set" of absolute paths to given filenames.
-  __attribute__((cleanup(simple_archiver_hash_map_free)))
-  SDArchiverHashMap *abs_filenames = simple_archiver_hash_map_init();
-  void **ptr_array = malloc(sizeof(void *) * 2);
-  ptr_array[0] = abs_filenames;
-  ptr_array[1] = (void *)state->parsed->user_cwd;
-  if (simple_archiver_list_get(filenames, filenames_to_abs_map_fn, ptr_array)) {
-    free(ptr_array);
-    return SDAS_FAILED_TO_CREATE_MAP;
-  }
-  free(ptr_array);
-
   // TODO Impl.
   fprintf(stderr, "Writing v1 unimplemented\n");
   return SDAS_INTERNAL_ERROR;
@@ -1769,17 +1666,6 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
           }
         } else {
           skip = 0;
-          int fd = open((const char *)buf, O_RDONLY | O_NOFOLLOW);
-          if (fd == -1) {
-            if (errno == ELOOP) {
-              // Is an existing symbolic file.
-              unlink((const char *)buf);
-            }
-          } else {
-            close(fd);
-            // Is an existing file.
-            unlink((const char *)buf);
-          }
         }
         if (!skip) {
           out_f_name = malloc(strlen((const char *)buf) + 1);
@@ -1789,17 +1675,17 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
     } else {
       __attribute__((
           cleanup(simple_archiver_helper_cleanup_malloced))) void *heap_buf =
-          malloc((uint32_t)u16 + 1);
+          malloc(u16 + 1);
       uint8_t *uc_heap_buf = heap_buf;
-      if (fread(uc_heap_buf, 1, (uint32_t)u16 + 1, in_f) != (size_t)u16 + 1) {
+      if (fread(uc_heap_buf, 1, u16 + 1, in_f) != (size_t)u16 + 1) {
         return SDAS_INVALID_FILE;
       }
-      uc_heap_buf[u16] = 0;
+      uc_heap_buf[u16 - 1] = 0;
       fprintf(stderr, "  Filename: %s\n", uc_heap_buf);
       if (do_extract) {
         if ((state->parsed->flags & 0x8) == 0) {
           __attribute__((cleanup(simple_archiver_helper_cleanup_FILE)))
-          FILE *test_fd = fopen((const char *)uc_heap_buf, "rb");
+          FILE *test_fd = fopen((const char *)buf, "rb");
           if (test_fd) {
             skip = 1;
             fprintf(stderr,
@@ -1810,22 +1696,10 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
           }
         } else {
           skip = 0;
-          int fd = open((const char *)uc_heap_buf, O_RDONLY | O_NOFOLLOW);
-          if (fd == -1) {
-            if (errno == ELOOP) {
-              // Is an existing symbolic file.
-              unlink((const char *)uc_heap_buf);
-            }
-          } else {
-            close(fd);
-            // Is an existing file.
-            unlink((const char *)uc_heap_buf);
-          }
         }
         if (!skip) {
-          out_f_name = malloc(strlen((const char *)uc_heap_buf) + 1);
-          memcpy(out_f_name, uc_heap_buf,
-                 strlen((const char *)uc_heap_buf) + 1);
+          out_f_name = malloc(strlen((const char *)buf) + 1);
+          memcpy(out_f_name, buf, strlen((const char *)buf) + 1);
         }
       }
     }
@@ -1948,12 +1822,6 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
 
         simple_archiver_helper_make_dirs((const char *)out_f_name);
         out_f = fopen(out_f_name, "wb");
-        if (!out_f) {
-          fprintf(stderr,
-                  "WARNING: Failed to open \"%s\" for writing! (No write "
-                  "permissions?)\n",
-                  (char *)out_f_name);
-        }
         __attribute__((
             cleanup(cleanup_temp_filename_delete))) void **ptrs_array =
             malloc(sizeof(void *) * 2);
@@ -1962,7 +1830,7 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
 #if SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_COSMOPOLITAN || \
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_MAC ||          \
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_LINUX
-        if (is_compressed && out_f) {
+        if (is_compressed) {
           // Handle SIGPIPE.
           signal(SIGPIPE, handle_sig_pipe);
 
@@ -2170,12 +2038,10 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
                 // Error.
                 return SDAS_INTERNAL_ERROR;
               }
-              if (out_f) {
-                fwrite(buf, 1, fread_ret, out_f);
-                if (ferror(out_f)) {
-                  // Error.
-                  return SDAS_INTERNAL_ERROR;
-                }
+              fwrite(buf, 1, fread_ret, out_f);
+              if (ferror(out_f)) {
+                // Error.
+                return SDAS_INTERNAL_ERROR;
               }
               compressed_file_size -= fread_ret;
             } else {
@@ -2184,12 +2050,10 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
                 // Error.
                 return SDAS_INTERNAL_ERROR;
               }
-              if (out_f) {
-                fwrite(buf, 1, fread_ret, out_f);
-                if (ferror(out_f)) {
-                  // Error.
-                  return SDAS_INTERNAL_ERROR;
-                }
+              fwrite(buf, 1, fread_ret, out_f);
+              if (ferror(out_f)) {
+                // Error.
+                return SDAS_INTERNAL_ERROR;
               }
               compressed_file_size -= fread_ret;
             }
@@ -2202,9 +2066,7 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
         }
 
         ptrs_array[0] = NULL;
-        if (out_f) {
-          fprintf(stderr, "  Extracted.\n");
-        }
+        fprintf(stderr, "  Extracted.\n");
 #endif
       } else {
         while (u64 != 0) {
@@ -2283,108 +2145,26 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
         fprintf(stderr, "  Link relative path: %s\n", (char *)rel_path);
       }
 
-      if (do_extract && !skip) {
+      if (do_extract) {
         simple_archiver_helper_make_dirs((const char *)out_f_name);
         if (abs_path && rel_path) {
           if (abs_preferred) {
 #if SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_COSMOPOLITAN || \
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_MAC ||          \
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_LINUX
-            int_fast8_t retry_symlink = 0;
-            int ret;
-          V0_SYMLINK_CREATE_RETRY_0:
-            ret = symlink(abs_path, out_f_name);
+            int ret = symlink(abs_path, out_f_name);
             if (ret == -1) {
-              if (retry_symlink) {
-                fprintf(stderr,
-                        "WARNING: Failed to create symlink after removing "
-                        "existing symlink!\n");
-                goto V0_SYMLINK_CREATE_AFTER_0;
-              } else if (errno == EEXIST) {
-                if ((state->parsed->flags & 8) == 0) {
-                  fprintf(
-                      stderr,
-                      "WARNING: Symlink already exists and "
-                      "\"--overwrite-extract\" is not specified, skipping!\n");
-                  goto V0_SYMLINK_CREATE_AFTER_0;
-                } else {
-                  fprintf(stderr,
-                          "NOTICE: Symlink already exists and "
-                          "\"--overwrite-extract\" specified, attempting to "
-                          "overwrite...\n");
-                  unlink(out_f_name);
-                  retry_symlink = 1;
-                  goto V0_SYMLINK_CREATE_RETRY_0;
-                }
-              } else {
-                return SDAS_FAILED_TO_EXTRACT_SYMLINK;
-              }
+              return SDAS_FAILED_TO_EXTRACT_SYMLINK;
             }
-            ret = fchmodat(AT_FDCWD, out_f_name, permissions,
-                           AT_SYMLINK_NOFOLLOW);
-            if (ret == -1) {
-              if (errno == EOPNOTSUPP) {
-                fprintf(stderr,
-                        "NOTICE: Setting permissions of symlink is not "
-                        "supported by FS/OS!\n");
-              } else {
-                fprintf(stderr,
-                        "WARNING: Failed to set permissions of symlink (%d)!\n",
-                        errno);
-              }
-            }
-          V0_SYMLINK_CREATE_AFTER_0:
-            retry_symlink = 1;
 #endif
           } else {
 #if SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_COSMOPOLITAN || \
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_MAC ||          \
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_LINUX
-            int_fast8_t retry_symlink = 0;
-            int ret;
-          V0_SYMLINK_CREATE_RETRY_1:
-            ret = symlink(rel_path, out_f_name);
+            int ret = symlink(rel_path, out_f_name);
             if (ret == -1) {
-              if (retry_symlink) {
-                fprintf(stderr,
-                        "WARNING: Failed to create symlink after removing "
-                        "existing symlink!\n");
-                goto V0_SYMLINK_CREATE_AFTER_1;
-              } else if (errno == EEXIST) {
-                if ((state->parsed->flags & 8) == 0) {
-                  fprintf(
-                      stderr,
-                      "WARNING: Symlink already exists and "
-                      "\"--overwrite-extract\" is not specified, skipping!\n");
-                  goto V0_SYMLINK_CREATE_AFTER_1;
-                } else {
-                  fprintf(stderr,
-                          "NOTICE: Symlink already exists and "
-                          "\"--overwrite-extract\" specified, attempting to "
-                          "overwrite...\n");
-                  unlink(out_f_name);
-                  retry_symlink = 1;
-                  goto V0_SYMLINK_CREATE_RETRY_1;
-                }
-              } else {
-                return SDAS_FAILED_TO_EXTRACT_SYMLINK;
-              }
+              return SDAS_FAILED_TO_EXTRACT_SYMLINK;
             }
-            ret = fchmodat(AT_FDCWD, out_f_name, permissions,
-                           AT_SYMLINK_NOFOLLOW);
-            if (ret == -1) {
-              if (errno == EOPNOTSUPP) {
-                fprintf(stderr,
-                        "NOTICE: Setting permissions of symlink is not "
-                        "supported by FS/OS!\n");
-              } else {
-                fprintf(stderr,
-                        "WARNING: Failed to set permissions of symlink (%d)!\n",
-                        errno);
-              }
-            }
-          V0_SYMLINK_CREATE_AFTER_1:
-            retry_symlink = 1;
 #endif
           }
         } else if (abs_path) {
@@ -2395,19 +2175,6 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
           if (ret == -1) {
             return SDAS_FAILED_TO_EXTRACT_SYMLINK;
           }
-          ret =
-              fchmodat(AT_FDCWD, out_f_name, permissions, AT_SYMLINK_NOFOLLOW);
-          if (ret == -1) {
-            if (errno == EOPNOTSUPP) {
-              fprintf(stderr,
-                      "NOTICE: Setting permissions of symlink is not supported "
-                      "by FS/OS!\n");
-            } else {
-              fprintf(stderr,
-                      "WARNING: Failed to set permissions of symlink (%d)!\n",
-                      errno);
-            }
-          }
 #endif
         } else if (rel_path) {
 #if SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_COSMOPOLITAN || \
@@ -2417,19 +2184,6 @@ int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
           if (ret == -1) {
             return SDAS_FAILED_TO_EXTRACT_SYMLINK;
           }
-          ret =
-              fchmodat(AT_FDCWD, out_f_name, permissions, AT_SYMLINK_NOFOLLOW);
-          if (ret == -1) {
-            if (errno == EOPNOTSUPP) {
-              fprintf(stderr,
-                      "NOTICE: Setting permissions of symlink is not supported "
-                      "by FS/OS!\n");
-            } else {
-              fprintf(stderr,
-                      "WARNING: Failed to set permissions of symlink (%d)!\n",
-                      errno);
-            }
-          }
 #endif
         } else {
           fprintf(
@@ -2537,13 +2291,6 @@ int simple_archiver_parse_archive_version_1(FILE *in_f, int_fast8_t do_extract,
       return SDAS_INVALID_FILE;
     }
     const uint_fast8_t absolute_preferred = (buf[0] & 1) ? 1 : 0;
-
-#if SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_COSMOPOLITAN || \
-    SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_MAC ||          \
-    SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_LINUX
-    mode_t permissions = permissions_from_bits_v1_symlink(buf, 0);
-#endif
-
     uint_fast8_t link_extracted = 0;
     uint_fast8_t skip_due_to_map = 0;
 
@@ -2565,13 +2312,6 @@ int simple_archiver_parse_archive_version_1(FILE *in_f, int_fast8_t do_extract,
 
     if (!do_extract) {
       fprintf(stderr, "  Link name: %s\n", link_name);
-#if SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_COSMOPOLITAN || \
-    SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_MAC ||          \
-    SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_LINUX
-      fprintf(stderr, "  Link Permissions: ");
-      print_permissions(permissions);
-      fprintf(stderr, "\n");
-#endif
     }
 
     if (working_files_map &&
@@ -2600,49 +2340,12 @@ int simple_archiver_parse_archive_version_1(FILE *in_f, int_fast8_t do_extract,
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_MAC ||          \
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_LINUX
         simple_archiver_helper_make_dirs(link_name);
-        int_fast8_t link_create_retry = 0;
-      V1_SYMLINK_CREATE_RETRY_0:
         ret = symlink(path, link_name);
         if (ret == -1) {
-          if (link_create_retry) {
-            fprintf(stderr,
-                    "WARNING: Failed to create symlink after removing existing "
-                    "symlink!\n");
-            goto V1_SYMLINK_CREATE_AFTER_0;
-          } else if (errno == EEXIST) {
-            if ((state->parsed->flags & 8) == 0) {
-              fprintf(stderr,
-                      "WARNING: Symlink already exists and "
-                      "\"--overwrite-extract\" is not specified, skipping!\n");
-              goto V1_SYMLINK_CREATE_AFTER_0;
-            } else {
-              fprintf(
-                  stderr,
-                  "NOTICE: Symlink already exists and \"--overwrite-extract\" "
-                  "specified, attempting to overwrite...\n");
-              unlink(link_name);
-              link_create_retry = 1;
-              goto V1_SYMLINK_CREATE_RETRY_0;
-            }
-          }
           return SDAS_FAILED_TO_EXTRACT_SYMLINK;
         }
-        ret = fchmodat(AT_FDCWD, link_name, permissions, AT_SYMLINK_NOFOLLOW);
-        if (ret == -1) {
-          if (errno == EOPNOTSUPP) {
-            fprintf(stderr,
-                    "NOTICE: Setting permissions of symlink is not supported "
-                    "by FS/OS!\n");
-          } else {
-            fprintf(stderr,
-                    "WARNING: Failed to set permissions of symlink (%d)!\n",
-                    errno);
-          }
-        }
         link_extracted = 1;
         fprintf(stderr, "  %s -> %s\n", link_name, path);
-      V1_SYMLINK_CREATE_AFTER_0:
-        link_create_retry = 1;
 #endif
       } else {
         fprintf(stderr, "  Abs path: %s\n", path);
@@ -2670,49 +2373,12 @@ int simple_archiver_parse_archive_version_1(FILE *in_f, int_fast8_t do_extract,
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_MAC ||          \
     SIMPLE_ARCHIVER_PLATFORM == SIMPLE_ARCHIVER_PLATFORM_LINUX
         simple_archiver_helper_make_dirs(link_name);
-        int_fast8_t link_create_retry = 0;
-      V1_SYMLINK_CREATE_RETRY_1:
         ret = symlink(path, link_name);
         if (ret == -1) {
-          if (link_create_retry) {
-            fprintf(stderr,
-                    "WARNING: Failed to create symlink after removing existing "
-                    "symlink!\n");
-            goto V1_SYMLINK_CREATE_AFTER_1;
-          } else if (errno == EEXIST) {
-            if ((state->parsed->flags & 8) == 0) {
-              fprintf(stderr,
-                      "WARNING: Symlink already exists and "
-                      "\"--overwrite-extract\" is not specified, skipping!\n");
-              goto V1_SYMLINK_CREATE_AFTER_1;
-            } else {
-              fprintf(
-                  stderr,
-                  "NOTICE: Symlink already exists and \"--overwrite-extract\" "
-                  "specified, attempting to overwrite...\n");
-              unlink(link_name);
-              link_create_retry = 1;
-              goto V1_SYMLINK_CREATE_RETRY_1;
-            }
-          }
           return SDAS_FAILED_TO_EXTRACT_SYMLINK;
         }
-        ret = fchmodat(AT_FDCWD, link_name, permissions, AT_SYMLINK_NOFOLLOW);
-        if (ret == -1) {
-          if (errno == EOPNOTSUPP) {
-            fprintf(stderr,
-                    "NOTICE: Setting permissions of symlink is not supported "
-                    "by FS/OS!\n");
-          } else {
-            fprintf(stderr,
-                    "WARNING: Failed to set permissions of symlink (%d)!\n",
-                    errno);
-          }
-        }
         link_extracted = 1;
         fprintf(stderr, "  %s -> %s\n", link_name, path);
-      V1_SYMLINK_CREATE_AFTER_1:
-        link_create_retry = 1;
 #endif
       } else {
         fprintf(stderr, "  Rel path: %s\n", path);
@@ -2768,27 +2434,6 @@ int simple_archiver_parse_archive_version_1(FILE *in_f, int_fast8_t do_extract,
       }
       file_info->filename[u16] = 0;
 
-      if (state && state->parsed && (state->parsed->flags & 8) != 0) {
-        int fd = open((const char *)buf, O_RDONLY | O_NOFOLLOW);
-        if (fd == -1) {
-          if (errno == ELOOP) {
-            // Exists as a symlink.
-            fprintf(stderr,
-                    "WARNING: Filename \"%s\" already exists as symlink, "
-                    "removing...\n",
-                    (const char *)buf);
-            unlink((const char *)buf);
-          } else {
-            // File doesn't exist, do nothing.
-          }
-        } else {
-          close(fd);
-          fprintf(stderr, "WARNING: File \"%s\" already exists, removing...\n",
-                  (const char *)buf);
-          unlink((const char *)buf);
-        }
-      }
-
       if (fread(file_info->bit_flags, 1, 4, in_f) != 4) {
         return SDAS_INVALID_FILE;
       }
@@ -3227,53 +2872,3 @@ int simple_archiver_de_compress(int pipe_fd_in[2], int pipe_fd_out[2],
   return 1;
 #endif
 }
-
-char *simple_archiver_filenames_to_relative_path(const char *from_abs,
-                                                 const char *to_abs) {
-  if (!from_abs || !to_abs) {
-    return NULL;
-  }
-
-  // Get first non-common char and last slash before it.
-  uint_fast32_t idx;
-  uint_fast32_t last_slash;
-  for (idx = 0, last_slash = 0; idx < strlen(from_abs) && idx < strlen(to_abs);
-       ++idx) {
-    if (((const char *)to_abs)[idx] != ((const char *)from_abs)[idx]) {
-      break;
-    } else if (((const char *)to_abs)[idx] == '/') {
-      last_slash = idx + 1;
-    }
-  }
-
-  // Get substrings of both paths.
-  char *link_substr = (char *)from_abs + last_slash;
-  char *dest_substr = (char *)to_abs + last_slash;
-  char *rel_path = malloc(strlen(dest_substr) + 1);
-  strncpy(rel_path, dest_substr, strlen(dest_substr) + 1);
-
-  // fprintf(stderr, "DEBUG: link_substr \"%s\", dest_substr \"%s\"\n",
-  //     link_substr, dest_substr);
-
-  // Get the relative path finally.
-  int_fast8_t has_slash = 0;
-  idx = 0;
-  do {
-    for (; link_substr[idx] != '/' && link_substr[idx] != 0; ++idx);
-    if (link_substr[idx] == 0) {
-      has_slash = 0;
-    } else {
-      has_slash = 1;
-      char *new_rel_path = malloc(strlen(rel_path) + 1 + 3);
-      new_rel_path[0] = '.';
-      new_rel_path[1] = '.';
-      new_rel_path[2] = '/';
-      strncpy(new_rel_path + 3, rel_path, strlen(rel_path) + 1);
-      free(rel_path);
-      rel_path = new_rel_path;
-      ++idx;
-    }
-  } while (has_slash);
-
-  return rel_path;
-}

src/archiver.h

@@ -40,7 +40,7 @@ typedef struct SDArchiverState {
   size_t digits;
 } SDArchiverState;
 
-typedef enum SDArchiverStateReturns {
+enum SDArchiverStateReturns {
   SDAS_SUCCESS = 0,
   SDAS_HEADER_ALREADY_WRITTEN = 1,
   SDAS_FAILED_TO_WRITE,
@@ -53,7 +53,7 @@ typedef enum SDArchiverStateReturns {
   SDAS_FAILED_TO_EXTRACT_SYMLINK,
   SDAS_FAILED_TO_CHANGE_CWD,
   SDAS_INVALID_WRITE_VERSION
-} SDArchiverStateReturns;
+};
 
 /// Returned pointer must not be freed.
 char *simple_archiver_error_to_string(enum SDArchiverStateReturns error);
@@ -88,8 +88,4 @@ int simple_archiver_parse_archive_version_1(FILE *in_f, int_fast8_t do_extract,
 int simple_archiver_de_compress(int pipe_fd_in[2], int pipe_fd_out[2],
                                 const char *cmd, void *pid_out);
 
-/// If returns non-NULL, must be free'd.
-char *simple_archiver_filenames_to_relative_path(const char *from_abs,
-                                                 const char *to_abs);
-
 #endif

src/main.c

@@ -97,8 +97,7 @@ int main(int argc, const char **argv) {
       int ret = simple_archiver_write_all(file, state, filenames);
       if (ret != SDAS_SUCCESS) {
         fprintf(stderr, "Error during writing.\n");
-        char *error_str =
-            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
+        char *error_str = simple_archiver_error_to_string(ret);
         fprintf(stderr, "  %s\n", error_str);
       }
       fclose(file);
@@ -114,8 +113,7 @@ int main(int argc, const char **argv) {
       int ret = simple_archiver_write_all(stdout, state, filenames);
       if (ret != SDAS_SUCCESS) {
         fprintf(stderr, "Error during writing.\n");
-        char *error_str =
-            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
+        char *error_str = simple_archiver_error_to_string(ret);
         fprintf(stderr, "  %s\n", error_str);
       }
     }
@@ -132,8 +130,7 @@ int main(int argc, const char **argv) {
       int ret = simple_archiver_parse_archive_info(file, 0, NULL);
       if (ret != 0) {
         fprintf(stderr, "Error during archive checking/examining.\n");
-        char *error_str =
-            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
+        char *error_str = simple_archiver_error_to_string(ret);
         fprintf(stderr, "  %s\n", error_str);
       }
       fclose(file);
@@ -141,8 +138,7 @@ int main(int argc, const char **argv) {
       int ret = simple_archiver_parse_archive_info(stdin, 0, NULL);
       if (ret != 0) {
         fprintf(stderr, "Error during archive checking/examining.\n");
-        char *error_str =
-            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
+        char *error_str = simple_archiver_error_to_string(ret);
         fprintf(stderr, "  %s\n", error_str);
       }
     }
@@ -161,8 +157,7 @@ int main(int argc, const char **argv) {
       int ret = simple_archiver_parse_archive_info(file, 1, state);
       if (ret != SDAS_SUCCESS) {
         fprintf(stderr, "Error during archive extracting.\n");
-        char *error_str =
-            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
+        char *error_str = simple_archiver_error_to_string(ret);
         fprintf(stderr, "  %s\n", error_str);
       }
       fclose(file);
@@ -170,8 +165,7 @@ int main(int argc, const char **argv) {
       int ret = simple_archiver_parse_archive_info(stdin, 1, state);
       if (ret != SDAS_SUCCESS) {
         fprintf(stderr, "Error during archive extracting.\n");
-        char *error_str =
-            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
+        char *error_str = simple_archiver_error_to_string(ret);
         fprintf(stderr, "  %s\n", error_str);
       }
     }

src/test.c

@@ -23,7 +23,6 @@
 #include <string.h>
 
 // Local includes.
-#include "archiver.h"
 #include "helpers.h"
 #include "parser_internal.h"
 
@@ -242,21 +241,6 @@ int main(void) {
     free(out);
   }
 
-  // Test archiver.
-  {
-    __attribute__((
-        cleanup(simple_archiver_helper_cleanup_c_string))) char *rel_path =
-        simple_archiver_filenames_to_relative_path(
-            "/one/two/three/four/five", "/one/two/branch/other/path");
-    CHECK_STREQ(rel_path, "../../branch/other/path");
-    simple_archiver_helper_cleanup_c_string(&rel_path);
-
-    rel_path = simple_archiver_filenames_to_relative_path(
-        "/one/two/three/four/five", "/one/two/three/other/dir/");
-    CHECK_STREQ(rel_path, "../other/dir/");
-    simple_archiver_helper_cleanup_c_string(&rel_path);
-  }
-
   printf("Checks checked: %u\n", checks_checked);
   printf("Checks passed:  %u\n", checks_passed);
   return checks_passed == checks_checked ? 0 : 1;