Refactorings for v1 extract, other refactorings

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

CMakeLists.txt

@@ -83,6 +83,7 @@ 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

@@ -76,3 +76,117 @@ Following the file-count bytes, the following bytes are added for each file:
     1. 8 bytes 64-bit unsigned integer "size of filename in this archive file"
        in big-endian.
     2. X bytes file data (length defined by previous value).
+
+## Format Version 1
+
+File extension is "*.simplearchive" but this isn't really checked.
+
+First 18 bytes of file will be (in ascii):
+
+    SIMPLE_ARCHIVE_VER
+
+Next 2 bytes is a 16-bit unsigned integer "version" in big-endian. It will be:
+
+    0x00 0x01
+
+Next 4 bytes are bit-flags.
+
+1. The first byte
+    1. The first bit is set if de/compressor is set for this archive.
+
+The remaining unused flags in the previous bit-flags bytes are reserved for
+future revisions and are currently ignored.
+
+If the previous "de/compressor is set" flag is enabled, then the next section is
+added:
+
+1. 2 bytes is 16-bit unsigned integer "compressor cmd+args" in big-endian. This
+   does not include the NULL at the end of the string.
+2. X bytes of "compressor cmd+args" (length defined by previous value). Is a
+   NULL-terminated string.
+3. 2 bytes is 16-bit unsigned integer "decompressor cmd+args" in big-endian.
+   This does not include the NULL at the end of the string.
+4. X bytes of "decompressor cmd+args" (length defined by previous value). Is a
+   NULL-terminated string.
+
+The next 4 bytes is a 32-bit unsigned integer "link count" in big-endian which
+will indicate the number of symbolic links in this archive.
+
+Following the link-count bytes, the following bytes are added for each symlink:
+
+1. 2 bytes bit-flags:
+    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".
+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
+   string.
+4. 2 bytes is 16-bit unsigned integer "link target absolute path" in
+   big-endian. This does not include the NULL at the end of the string.
+5. X bytes of link-target-absolute-path (length defined by previous value).
+   Is a NULL-terminated string. If the previous "size" value is 0, then
+   this entry does not exist and should be skipped.
+6. 2 bytes is 16-bit unsigned integer "link target relative path" in
+   big-endian. This does not include the NULL at the end of the string.
+7. X bytes of link-target-relative-path (length defined by previous value).
+   Is a NULL-terminated string. If the previous "size" value is 0, then
+   this entry does not exist and should be skipped.
+
+After the symlink related data, the next 4 bytes is a 32-bit unsigned integer
+"chunk count" in big-endian which will indicate the number of chunks in this
+archive.
+
+Following the chunk-count bytes, the following bytes are added for each chunk:
+
+1. 2 bytes that are a 16-bit unsigned integer "file count" in big-endian.
+
+The following bytes are added for each file within the current chunk:
+
+1. 2 bytes that are a 16-bit unsigned integer "filename length" in big-endian.
+   This does not include the NULL at the end of the string.
+2. X bytes of filename (length defined by previous value). Is a NULL-terminated
+   string.
+3. 4 bytes bit-flags.
+    1. The first byte.
+        1. The first bit is "user read permission".
+        2. The second bit is "user write permission".
+        3. The third bit is "user execute permission".
+        4. The fourth bit is "group read permission".
+        5. The fifth bit is "group write permission".
+        6. The sixth bit is "group execute permission".
+        7. The seventh bit is "other read permission".
+        8. The eighth bit is "other write permission".
+    2. The second byte.
+        1. The first bit is "other execute permission".
+    3. The third byte.
+        1. Currently unused.
+    4. The fourth byte.
+        1. Currently unused.
+4. Two 4-byte unsigned integers in big-endian for UID and GID.
+    1. A 32-bit unsigned integer in big endian that specifies the UID of the
+       file. Note that during extraction, if the user is not root, then this
+       value will be ignored.
+    2. A 32-bit unsigned integer in big endian that specifies the GID of the
+       file. Note that during extraction, if the user is not root, then this
+       value will be ignored.
+5. A 64-bit unsigned integer in big endian for the "size of file".
+
+After the files' metadata are the current chunk's data:
+
+1. A 64-bit unsigned integer in big endian for the "size of chunk".
+2. X bytes of data for the current chunk of the previously specified size. If
+   not using de/compressor, this section is the previously mentioned files
+   concatenated with each other. If using de/compressor, this section is the
+   previously mentioned files concatenated and compressed into a single blob of
+   data.

src/archiver.h

@@ -40,7 +40,7 @@ typedef struct SDArchiverState {
   size_t digits;
 } SDArchiverState;
 
-enum SDArchiverStateReturns {
+typedef enum SDArchiverStateReturns {
   SDAS_SUCCESS = 0,
   SDAS_HEADER_ALREADY_WRITTEN = 1,
   SDAS_FAILED_TO_WRITE,
@@ -51,8 +51,9 @@ enum SDArchiverStateReturns {
   SDAS_INTERNAL_ERROR,
   SDAS_FAILED_TO_CREATE_MAP,
   SDAS_FAILED_TO_EXTRACT_SYMLINK,
-  SDAS_FAILED_TO_CHANGE_CWD
+  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);
@@ -65,12 +66,30 @@ void simple_archiver_free_state(SDArchiverState **state);
 int simple_archiver_write_all(FILE *out_f, SDArchiverState *state,
                               const SDArchiverLinkedList *filenames);
 
+int simple_archiver_write_v0(FILE *out_f, SDArchiverState *state,
+                             const SDArchiverLinkedList *filenames);
+
+int simple_archiver_write_v1(FILE *out_f, SDArchiverState *state,
+                             const SDArchiverLinkedList *filenames);
+
 /// Returns zero on success.
 int simple_archiver_parse_archive_info(FILE *in_f, int_fast8_t do_extract,
                                        const SDArchiverState *state);
 
+/// Returns zero on success.
+int simple_archiver_parse_archive_version_0(FILE *in_f, int_fast8_t do_extract,
+                                            const SDArchiverState *state);
+
+/// Returns zero on success.
+int simple_archiver_parse_archive_version_1(FILE *in_f, int_fast8_t do_extract,
+                                            const SDArchiverState *state);
+
 /// Returns zero on success.
 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

@@ -97,7 +97,8 @@ 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(ret);
+        char *error_str =
+            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
         fprintf(stderr, "  %s\n", error_str);
       }
       fclose(file);
@@ -113,7 +114,8 @@ 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(ret);
+        char *error_str =
+            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
         fprintf(stderr, "  %s\n", error_str);
       }
     }
@@ -130,7 +132,8 @@ 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(ret);
+        char *error_str =
+            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
         fprintf(stderr, "  %s\n", error_str);
       }
       fclose(file);
@@ -138,7 +141,8 @@ 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(ret);
+        char *error_str =
+            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
         fprintf(stderr, "  %s\n", error_str);
       }
     }
@@ -157,7 +161,8 @@ 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(ret);
+        char *error_str =
+            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
         fprintf(stderr, "  %s\n", error_str);
       }
       fclose(file);
@@ -165,7 +170,8 @@ 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(ret);
+        char *error_str =
+            simple_archiver_error_to_string((SDArchiverStateReturns)ret);
         fprintf(stderr, "  %s\n", error_str);
       }
     }

src/parser.c

@@ -169,6 +169,9 @@ void simple_archiver_print_usage(void) {
   fprintf(stderr,
           "--temp-files-dir <dir> : where to store temporary files created "
           "when compressing (defaults to current working directory)\n");
+  fprintf(stderr,
+          "--write-version <version> : Force write version file format "
+          "(default 1)\n");
   fprintf(stderr,
           "-- : specifies remaining arguments are files to archive/extract\n");
   fprintf(
@@ -189,6 +192,7 @@ SDArchiverParsed simple_archiver_create_parsed(void) {
   parsed.working_files = NULL;
   parsed.temp_dir = NULL;
   parsed.user_cwd = NULL;
+  parsed.write_version = 0;
 
   return parsed;
 }
@@ -299,6 +303,26 @@ int simple_archiver_parse_args(int argc, const char **argv,
         out->temp_dir = argv[1];
         --argc;
         ++argv;
+      } else if (strcmp(argv[0], "--write-version") == 0) {
+        if (argc < 2) {
+          fprintf(stderr,
+                  "ERROR: --write-version expects an integer argument!\n");
+          simple_archiver_print_usage();
+          return 1;
+        }
+        int version = atoi(argv[1]);
+        if (version < 0) {
+          fprintf(stderr, "ERROR: --write-version cannot be negative!\n");
+          simple_archiver_print_usage();
+          return 1;
+        } else if (version > 1) {
+          fprintf(stderr, "ERROR: --write-version must be 0 or 1!\n");
+          simple_archiver_print_usage();
+          return 1;
+        }
+        out->write_version = (uint32_t)version;
+        --argc;
+        ++argv;
       } else if (argv[0][0] == '-' && argv[0][1] == '-' && argv[0][2] == 0) {
         is_remaining_args = 1;
       } else if (argv[0][0] != '-') {

src/parser.h

@@ -51,6 +51,8 @@ typedef struct SDArchiverParsed {
   const char *temp_dir;
   /// Dir specified by "-C".
   const char *user_cwd;
+  /// Currently only 0 and 1 is supported.
+  uint32_t write_version;
 } SDArchiverParsed;
 
 typedef struct SDArchiverFileInfo {

src/test.c

@@ -23,6 +23,7 @@
 #include <string.h>
 
 // Local includes.
+#include "archiver.h"
 #include "helpers.h"
 #include "parser_internal.h"
 
@@ -241,6 +242,21 @@ 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;