refactor: move dynarray into own module

While going through with the renaming, I saw that I actually forgot to implement that part.

LICENSE

@@ -0,0 +1,674 @@
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+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

Makefile

@@ -6,15 +6,20 @@ LIB_FILENAME ?= libvieter.a
 BUILD_DIR ?= build
 SRC_DIR ?= src
 TEST_DIR ?= test
-INC_DIRS ?= include
+3RDPARTY_DIR ?= thirdparty
+INCLUDE_DIR ?= include
 
+INC_DIRS ?= $(INCLUDE_DIR) $(3RDPARTY_DIR)/include
 LIB := $(BUILD_DIR)/$(LIB_FILENAME)
 
 SRCS != find '$(SRC_DIR)' -iname '*.c'
-SRCS_H != find $(INC_DIRS) -iname '*.h'
+SRCS_H != find $(INC_DIRS) '$(SRC_DIR)' -iname '*.h'
 SRCS_TEST != find '$(TEST_DIR)' -iname '*.c'
+SRCS_3RDPARTY != find '$(3RDPARTY_DIR)/src' -iname '*.c'
 
-OBJS := $(SRCS:%=$(BUILD_DIR)/%.o)
+$(info ${SRCS})
+
+OBJS := $(SRCS:%=$(BUILD_DIR)/%.o) $(SRCS_3RDPARTY:%=$(BUILD_DIR)/%.o)
 OBJS_TEST := $(SRCS_TEST:%=$(BUILD_DIR)/%.o)
 DEPS := $(SRCS:%=$(BUILD_DIR)/%.d) $(SRCS_TEST:%=$(BUILD_DIR)/%.d)
 
@@ -22,6 +27,7 @@ BINS_TEST := $(OBJS_TEST:%.c.o=%)
 TARGETS_TEST := $(BINS_TEST:%=test-%)
 TARGETS_MEM_TEST := $(BINS_TEST:%=test-mem-%)
 
+LIBFLAGS := -larchive
 INC_FLAGS := $(addprefix -I,$(INC_DIRS))
 
 # -MMD: generate a .d file for every source file. This file can be imported by
@@ -43,13 +49,16 @@ objs: $(OBJS)
 
 .PHONY: vieter
 vieter: $(LIB)
-$(BUILD_DIR)/$(LIB_FILENAME): $(OBJS)
+$(LIB): $(OBJS)
 	ar -rcs $@ $(OBJS)
 
 $(BUILD_DIR)/$(SRC_DIR)/%.c.o: $(SRC_DIR)/%.c
 	mkdir -p $(dir $@)
 	$(CC) $(VIETERCFLAGS) -c $< -o $@
 
+$(BUILD_DIR)/$(3RDPARTY_DIR)/src/%.c.o: $(3RDPARTY_DIR)/src/%.c
+	mkdir -p $(dir $@)
+	$(CC) $(VIETERCFLAGS) -c $< -o $@
 
 # =====TESTING=====
 .PHONY: test
@@ -69,11 +78,9 @@ $(TARGETS_MEM_TEST): test-mem-%: %
 .PHONY: build-test
 build-test: $(BINS_TEST)
 
-# For simplicity, we link every object file to each of the test files. This
-# might be changed later if this starts to become too slow.
 $(BINS_TEST): %: %.c.o $(LIB)
 	$(CC) \
-		$^ -o $@
+		$^ $(LIBFLAGS) -o $@
 
 # Along with the include directory, each test includes $(TEST_DIR) (which
 # contains the acutest.h header file), and the src directory of the module it's

README.md

@@ -15,6 +15,10 @@ See the [source code](src) for the list of modules.
 Everything is handled by the provided Makefile. To compile the static library,
 simply run `make`.
 
+### Required libraries
+
+Libvieter requires libarchive.
+
 ### Project structure
 
 Each module has its own subdirectory inside `src`, e.g. `src/cron`. This
@@ -53,6 +57,17 @@ files defined in its respective module. This allows testing internal functions.
 To run the tests, simply run `make test`. If you wish to only run a specific
 test binary, you can find them in `build/test`.
 
+The name of tests in the `TEST_LIST` variable should be prefixed with the
+module they're testing. This makes it much easier to distinguish the output of
+tests in the CLI. For example:
+
+```c
+TEST_LIST = {
+    {"cron illegal parts", test_illegal_parts},
+    {NULL, NULL}
+};
+```
+
 ### `compile_commands.json`
 
 Clangd requires a `compile_commands.json` to function properly. You can

include/vieter_dynarray.h

@@ -0,0 +1,34 @@
+#ifndef VIETER_DYNARRAY
+#define VIETER_DYNARRAY
+
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct vieter_dynarray {
+  char **array;
+  size_t capacity;
+  size_t size;
+} vieter_dynarray;
+
+/*
+ * Allocate a dynamic array.
+ */
+vieter_dynarray *vieter_dynarray_init(size_t initial_capacity);
+
+/*
+ * Initialise array (if it's not already initialised) and insert a string.
+ */
+void vieter_dynarray_add(vieter_dynarray *da, const char *s);
+
+/*
+ * Deallocate dynamic array.
+ */
+void vieter_dynarray_free(vieter_dynarray *da);
+
+/*
+ * Convert a vieter_dynarray into an array by freeing all its surrounding
+ * components and returning the underlying array pointer.
+ */
+char **vieter_dynarray_convert(vieter_dynarray *da);
+
+#endif

include/vieter_package.h

@@ -0,0 +1,33 @@
+#ifndef VIETER_PACKAGE
+#define VIETER_PACKAGE
+
+typedef struct vieter_package vieter_package;
+
+typedef enum vieter_package_error {
+  vieter_package_ok = 0,
+  vieter_package_unarchive_error = 1,
+  vieter_package_stat_error = 2
+} vieter_package_error;
+
+/*
+ * Allocate an empty package
+ */
+vieter_package *vieter_package_init();
+
+/*
+ * Parse package file into something usable by libvieter.
+ */
+vieter_package_error vieter_package_read_archive(vieter_package *pkg,
+                                                 const char *pkg_path);
+
+/*
+ * Deallocate a package.
+ */
+void vieter_package_free(vieter_package **ptp);
+
+/*
+ * Create string that will become the package's desc file.
+ */
+char *vieter_package_to_description(vieter_package *pkg);
+
+#endif

include/vieter_tree.h

@@ -0,0 +1,70 @@
+#ifndef VIETER_TREE
+#define VIETER_TREE
+
+#include <stdint.h>
+#include <stdlib.h>
+
+typedef struct vieter_tree vieter_tree;
+
+typedef enum vieter_tree_error {
+  vieter_tree_ok = 0,
+  vieter_tree_already_present = 1,
+  vieter_tree_not_present = 2,
+  vieter_tree_iterator_done = 3
+} vieter_tree_error;
+
+/*
+ * Allocate and initialize a new red-black binary tree.
+ */
+vieter_tree *vieter_tree_init();
+
+/*
+ * Deallocate a red-black binary tree.
+ */
+void vieter_tree_free(vieter_tree *tree);
+
+/*
+ * Insert a new entry into the tree.
+ */
+vieter_tree_error vieter_tree_insert(vieter_tree *tree, uint64_t key,
+                                     void *data);
+
+/*
+ * Look for an entry in the tree.
+ */
+vieter_tree_error vieter_tree_search(void **out, vieter_tree *tree,
+                                     uint64_t key);
+
+/*
+ * Remove a given entry from the tree.
+ */
+vieter_tree_error vieter_tree_remove(void **out, vieter_tree *tree,
+                                     uint64_t key);
+
+/*
+ * Return how many entries are currently in the tree.
+ */
+uint64_t vieter_tree_size(vieter_tree *tree);
+
+/*
+ * An iterator that can be used to traverse a tree in-order.
+ */
+typedef struct vieter_tree_iterator vieter_tree_iterator;
+
+/*
+ * Allocate and initialize a new iterator from the given tree.
+ */
+vieter_tree_iterator *vieter_tree_iterator_from(vieter_tree *tree);
+
+/*
+ * Free an iterator.
+ */
+void vieter_tree_iterator_free(vieter_tree_iterator **ptp);
+
+/*
+ * Return the iterator's next element.
+ */
+vieter_tree_error vieter_tree_iterator_next(void **out,
+                                            vieter_tree_iterator *iter);
+
+#endif

src/cron/vieter_cron_parse.c

@@ -1,4 +1,4 @@
-#include "vieter_cron.h"
+#include "vieter_cron_parse.h"
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>

src/cron/vieter_cron_parse.h

@@ -0,0 +1,11 @@
+#ifndef VIETER_CRON_PARSE
+#define VIETER_CRON_PARSE
+
+#include "vieter_cron.h"
+
+vieter_cron_parse_error vieter_cron_expr_parse_range(uint64_t *out, char *s,
+                                                     uint8_t min, uint8_t max);
+
+vieter_cron_parse_error vieter_cron_expr_parse_part(uint64_t *out, char *s,
+                                                    uint8_t min, uint8_t max);
+#endif

src/dynarray/vieter_dynarray.c

@@ -0,0 +1,58 @@
+#include "vieter_dynarray.h"
+
+vieter_dynarray *vieter_dynarray_init(size_t initial_capacity) {
+  vieter_dynarray *da = malloc(sizeof(vieter_dynarray));
+  da->size = 0;
+  da->capacity = initial_capacity;
+
+  return da;
+}
+
+void vieter_dynarray_add(vieter_dynarray *da, const char *s) {
+  // An empty vieter_dynarray does not have an allocated internal array
+  // yet
+  if (da->size == 0) {
+    da->array = malloc(sizeof(char *) * da->capacity);
+
+    // Initialise all char*'s to 0 so array[i] == NULL can be used to see if
+    // field is empty
+    memset(da->array, 0, sizeof(char *) * da->capacity);
+  }
+  // Double array size if it's full
+  else if (da->size == da->capacity) {
+    // if the realloc fails, access to memory in da->array is lost
+    da->array = realloc(da->array, sizeof(char *) * da->capacity * 2);
+    da->capacity *= 2;
+
+    // Same as the previous memset, but only for newly allocated pointers
+    memset(da->array + da->size, 0, sizeof(char *) * da->capacity / 2);
+  }
+
+  da->array[da->size] = strdup(s);
+  da->size++;
+}
+
+void vieter_dynarray_free(vieter_dynarray *da) {
+  if (da == NULL) {
+    return;
+  }
+
+  if (da->array != NULL) {
+    for (size_t i = 0; i < da->size; i++) {
+      free(da->array[i]);
+    }
+
+    free(da->array);
+  }
+
+  free(da);
+}
+
+char **vieter_dynarray_convert(vieter_dynarray *da) {
+  char **array = da->array;
+
+  da->array = NULL;
+  vieter_dynarray_free(da);
+
+  return array;
+}

src/heap/vieter_heap_tree.h

@@ -36,7 +36,8 @@ void vieter_heap_tree_free(vieter_heap_node *root);
  * Given the roots of the smallest trees in two heaps, merge them into a single
  * large heap.
  */
-vieter_heap_node *vieter_heap_tree_merge(vieter_heap_node *root_a, vieter_heap_node *root_b);
+vieter_heap_node *vieter_heap_tree_merge(vieter_heap_node *root_a,
+                                         vieter_heap_node *root_b);
 
 /*
  * Given the roots of two trees of the same order, merge them into a heap of one

src/package/README.md

@@ -0,0 +1,5 @@
+# package
+
+This module handles both parsing the published Arch tarballs & the contents of
+their `.PKGINFO` files, as well as generating the contents of the database
+archives' `desc` & `files` files.

src/package/vieter_package.c

@@ -0,0 +1,263 @@
+#include <archive.h>
+#include <archive_entry.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "sha256.h"
+#include "vieter_package_internal.h"
+
+#define ADD_STRING(section, field)                                             \
+  if (pkg_info->field != 0) {                                                  \
+    size_to_be_written =                                                       \
+        snprintf(aux, small_buff_size, section, pkg_info->field);              \
+    if (size_to_be_written > small_buff_size) {                                \
+      aux = realloc(aux, size_to_be_written + 1);                              \
+      small_buff_size = size_to_be_written + 1;                                \
+      snprintf(aux, small_buff_size, section, pkg_info->field);                \
+    }                                                                          \
+    if (buff_size < strlen(description) + small_buff_size + 1) {               \
+      description = realloc(description, buff_size * 2);                       \
+      buff_size *= 2;                                                          \
+    }                                                                          \
+    strcat(description, aux);                                                  \
+  }
+
+#define ADD_ARRAY(section, field)                                              \
+  i = 0;                                                                       \
+  if (pkg_info->field != NULL) {                                               \
+    ADD_STRING(section, field->array[i]);                                      \
+    i++;                                                                       \
+    while (pkg_info->field->array[i] != NULL) {                                \
+      ADD_STRING("\n%s", field->array[i]);                                     \
+      i++;                                                                     \
+    }                                                                          \
+  }
+
+static char *ignored_names[5] = {".BUILDINFO", ".INSTALL", ".MTREE", ".PKGINFO",
+                                 ".CHANGELOG"};
+static size_t ignored_words_len = sizeof(ignored_names) / sizeof(char *);
+
+vieter_package *vieter_package_init() {
+  return calloc(sizeof(vieter_package_info), 1);
+}
+
+vieter_package_error vieter_package_read_archive(vieter_package *pkg,
+                                                 const char *pkg_path) {
+  struct archive *a = archive_read_new();
+  struct archive_entry *entry;
+
+  // These three are the most commonly used compression methods
+  archive_read_support_filter_zstd(a);
+  archive_read_support_filter_gzip(a);
+  archive_read_support_filter_xz(a);
+
+  // Contents should always be a tarball
+  archive_read_support_format_tar(a);
+
+  // TODO where does this 10240 come from?
+  int r = archive_read_open_filename(a, pkg_path, 10240);
+
+  // Exit early if we weren't able to successfully open the archive for reading
+  if (r != ARCHIVE_OK) {
+    return vieter_package_unarchive_error;
+  }
+
+  int compression_code = archive_filter_code(a, 0);
+  const char *path_name;
+
+  vieter_package_info *pkg_info = NULL;
+  vieter_dynarray *files = vieter_dynarray_init(16);
+  vieter_dynarray_add(files, "%FILES%");
+
+  while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
+    path_name = archive_entry_pathname(entry);
+
+    bool ignore = false;
+
+    for (size_t i = 0; i < ignored_words_len; i++) {
+      if (strcmp(path_name, ignored_names[i]) == 0) {
+        ignore = true;
+        break;
+      }
+    }
+
+    if (!ignore) {
+      vieter_dynarray_add(files, path_name);
+    }
+
+    if (strcmp(path_name, ".PKGINFO") == 0) {
+      // Read data of file into memory buffer
+      int size = archive_entry_size(entry);
+      char *buf = malloc(size + 1);
+      archive_read_data(a, buf, size);
+      buf[size] = '\0';
+
+      // Parse package vieter_package_info string into a struct
+      pkg_info = vieter_package_info_init();
+      vieter_package_info_parse(pkg_info, buf);
+
+      free(buf);
+    } else {
+      archive_read_data_skip(a);
+    }
+  }
+
+  // Get size of file
+  struct stat stats;
+
+  if (stat(pkg_path, &stats) != 0) {
+    // errno is set if stat() fails; the calling function should check
+    // the value of errno in case vieter_package_stat_error is returned
+    return vieter_package_stat_error;
+  }
+
+  pkg_info->csize = stats.st_size;
+
+  archive_read_free(a);
+
+  // Create final return value
+  pkg->path = strdup(pkg_path);
+  pkg->info = pkg_info;
+  pkg->files = files;
+  pkg->compression = compression_code;
+
+  return vieter_package_ok;
+}
+
+void vieter_package_sha256sum(vieter_package *pkg, char *res) {
+  FILE *f = fopen(pkg->path, "r");
+  // Try to read 100KiB at a time
+  unsigned char *in = malloc(102400);
+  // Actual number of bytes read
+  size_t read_size;
+
+  SHA256_CTX *ctx = malloc(sizeof(SHA256_CTX));
+  sha256_init(ctx);
+  while ((read_size = fread(in, 1, 102400, f)) != 0) {
+    sha256_update(ctx, in, read_size);
+  }
+  unsigned char hash[SHA256_BLOCK_SIZE];
+
+  sha256_final(ctx, hash);
+
+  fclose(f);
+  free(in);
+  free(ctx);
+
+  // We need to convert the bytes in the hash to get a string representation of
+  // its hex values i.e. turn 1001 1111 into the string "9f" Each byte of the
+  // hash is going to turn into two bytes in the final string so we are going to
+  // convert each half byte into a char
+  unsigned int half_byte = 0;
+  int j = 0;
+
+  // We advance 2 bytes in the string for every one byte of the hash
+  for (int i = 0; i < SHA256_BLOCK_SIZE; i++) {
+    // We transform the first half byte into the second character to keep
+    // each byte from becoming reversed in the final string
+    half_byte = hash[i] & 0b1111;
+    if (half_byte < 10) {
+      res[j + 1] = half_byte + 48;
+    } else {
+      res[j + 1] = half_byte + 87;
+    }
+    hash[i] = hash[i] >> 4;
+    half_byte = hash[i] & 0b1111;
+    if (half_byte < 10) {
+      res[j] = half_byte + 48;
+    } else {
+      res[j] = half_byte + 87;
+    }
+
+    j += 2;
+  }
+  res[j] = '\0';
+}
+
+char *vieter_package_to_description(vieter_package *pkg) {
+  vieter_package_info *pkg_info = pkg->info;
+
+  size_t buff_size = 1024;
+  int small_buff_size = 128;
+  int size_to_be_written;
+  char *aux = malloc(sizeof(char) * small_buff_size);
+  char *description = malloc(sizeof(char) * buff_size);
+  // Helper variable for ADD_ARRAY macro
+  int i;
+
+  // special case for FILENAME
+  char *ext = NULL;
+  switch (pkg->compression) {
+  case 0:
+    ext = ".tar";
+    break;
+  case 1:
+    ext = ".tar.gz";
+    break;
+  case 6:
+    ext = ".tar.xz";
+    break;
+  case 14:
+    ext = ".tar.zst";
+    break;
+  }
+
+  size_to_be_written =
+      snprintf(aux, small_buff_size, "%%FILENAME%%\n%s-%s-%s.pkg%s",
+               pkg_info->name, pkg_info->version, pkg_info->arch, ext);
+
+  // We neither want to let an arbritrarily long input to overflow the buffer
+  // nor to truncate perfectly valid inputs
+  if (size_to_be_written > small_buff_size) {
+    aux = realloc(aux, size_to_be_written + 1);
+    small_buff_size = size_to_be_written + 1;
+    snprintf(aux, small_buff_size, "%%FILENAME%%\n%s-%s-%s.pkg.tar.zst",
+             pkg_info->name, pkg_info->version, pkg_info->arch);
+  }
+  strcpy(description, aux);
+
+  ADD_STRING("\n\n%%NAME%%\n%s", name);
+  ADD_STRING("\n\n%%BASE%%\n%s", base);
+  ADD_STRING("\n\n%%VERSION%%\n%s", version);
+  ADD_STRING("\n\n%%DESC%%\n%s", description);
+  ADD_ARRAY("\n\n%%GROUPS%%\n%s", groups);
+  ADD_STRING("\n\n%%CSIZE%%\n%ld", csize);
+  ADD_STRING("\n\n%%ISIZE%%\n%ld", size);
+
+  char checksum[SHA256_BLOCK_SIZE * 2 + 1];
+  vieter_package_sha256sum(pkg, checksum);
+
+  snprintf(aux, small_buff_size, "\n\n%%SHA256SUM%%\n%s", checksum);
+  if (buff_size < strlen(description) + small_buff_size + 1) {
+    description = realloc(description, buff_size * 2);
+    buff_size *= 2;
+  }
+  strcat(description, aux);
+
+  ADD_STRING("\n\n%%URL%%\n%s", url);
+  ADD_ARRAY("\n\n%%LICENSE%%\n%s", licenses);
+  ADD_STRING("\n\n%%ARCH%%\n%s", arch);
+  ADD_STRING("\n\n%%BUILDDATE%%\n%ld", build_date);
+  ADD_STRING("\n\n%%PACKAGER%%\n%s", packager);
+  ADD_ARRAY("\n\n%%REPLACES%%\n%s", replaces);
+  ADD_ARRAY("\n\n%%CONFLICTS%%\n%s", conflicts);
+  ADD_ARRAY("\n\n%%PROVIDES%%\n%s", provides);
+  ADD_ARRAY("\n\n%%DEPENDS%%\n%s", depends);
+  ADD_ARRAY("\n\n%%OPTDEPENDS%%\n%s", optdepends);
+  ADD_ARRAY("\n\n%%MAKEDEPENDS%%\n%s", makedepends);
+  ADD_ARRAY("\n\n%%CHECKDEPENDS%%\n%s", checkdepends);
+
+  strcat(description, "\n\n");
+
+  free(aux);
+
+  return description;
+}
+
+void vieter_package_free(vieter_package **ptp) {
+  FREE_STRING((*ptp)->path);
+  vieter_package_info_free((*ptp)->info);
+  vieter_dynarray_free((*ptp)->files);
+  free(*ptp);
+  *ptp = NULL;
+}

src/package/vieter_package_info.c

@@ -0,0 +1,86 @@
+#include <stdbool.h>
+
+#include "vieter_package_info.h"
+
+#define PKG_INFO_STRING(key_ptr, field)                                        \
+  if ((value_ptr = strstr(value_ptr, key_ptr)) != NULL) {                      \
+    value_ptr += strlen(key_ptr);                                              \
+    tail_ptr = strchr(value_ptr, '\n');                                        \
+    tail_ptr[0] = '\0';                                                        \
+    pkg_info->field = strdup(value_ptr);                                       \
+    tail_ptr[0] = '\n';                                                        \
+  }                                                                            \
+  value_ptr = tail_ptr;
+
+#define PKG_INFO_INT(key_ptr, field)                                           \
+  value_ptr = strstr(value_ptr, key_ptr) + strlen(key_ptr);                    \
+  tail_ptr = strchr(value_ptr, '\n');                                          \
+  tail_ptr[0] = '\0';                                                          \
+  pkg_info->field = atoi(value_ptr);                                           \
+  tail_ptr[0] = '\n';                                                          \
+  value_ptr = tail_ptr;
+
+#define PKG_INFO_ARRAY(key_ptr, field)                                         \
+  while ((value_ptr = strstr(value_ptr, key_ptr)) != NULL) {                   \
+    value_ptr = value_ptr + strlen(key_ptr);                                   \
+    tail_ptr = strchr(value_ptr, '\n');                                        \
+    tail_ptr[0] = '\0';                                                        \
+    if (pkg_info->field == NULL) {                                             \
+      pkg_info->field = vieter_dynarray_init(4);                               \
+    }                                                                          \
+    vieter_dynarray_add(pkg_info->field, value_ptr);                           \
+    tail_ptr[0] = '\n';                                                        \
+    value_ptr = tail_ptr;                                                      \
+  }                                                                            \
+  value_ptr = tail_ptr;
+
+vieter_package_info *vieter_package_info_init() {
+  return calloc(1, sizeof(vieter_package_info));
+}
+
+void vieter_package_info_free(vieter_package_info *pkg_info) {
+  FREE_STRING(pkg_info->name);
+  FREE_STRING(pkg_info->base);
+  FREE_STRING(pkg_info->version);
+  FREE_STRING(pkg_info->description);
+  FREE_STRING(pkg_info->url);
+  FREE_STRING(pkg_info->arch);
+  FREE_STRING(pkg_info->packager);
+  FREE_STRING(pkg_info->pgpsig);
+
+  vieter_dynarray_free(pkg_info->groups);
+  vieter_dynarray_free(pkg_info->licenses);
+  vieter_dynarray_free(pkg_info->replaces);
+  vieter_dynarray_free(pkg_info->depends);
+  vieter_dynarray_free(pkg_info->conflicts);
+  vieter_dynarray_free(pkg_info->provides);
+  vieter_dynarray_free(pkg_info->optdepends);
+  vieter_dynarray_free(pkg_info->makedepends);
+  vieter_dynarray_free(pkg_info->checkdepends);
+
+  free(pkg_info);
+}
+
+void vieter_package_info_parse(vieter_package_info *pkg_info,
+                               char *pkg_info_str) {
+  char *value_ptr = pkg_info_str, *tail_ptr = NULL;
+
+  PKG_INFO_STRING("\npkgname = ", name);
+  PKG_INFO_STRING("\npkgbase = ", base);
+  PKG_INFO_STRING("\npkgver = ", version);
+  PKG_INFO_STRING("\npkgdesc = ", description);
+  PKG_INFO_STRING("\nurl = ", url);
+  PKG_INFO_INT("\nbuilddate = ", build_date);
+  PKG_INFO_STRING("\npackager = ", packager);
+  PKG_INFO_INT("\nsize = ", size);
+  PKG_INFO_STRING("\narch = ", arch);
+  PKG_INFO_ARRAY("\nlicense = ", licenses);
+  PKG_INFO_ARRAY("\nreplaces = ", replaces);
+  PKG_INFO_ARRAY("\ngroup = ", groups);
+  PKG_INFO_ARRAY("\nconflict = ", conflicts);
+  PKG_INFO_ARRAY("\nprovides = ", provides);
+  PKG_INFO_ARRAY("\ndepend = ", depends);
+  PKG_INFO_ARRAY("\noptdepend = ", optdepends);
+  PKG_INFO_ARRAY("\nmakedepend = ", makedepends);
+  PKG_INFO_ARRAY("\ncheckdepend = ", checkdepends);
+}

src/package/vieter_package_info.h

@@ -0,0 +1,52 @@
+#ifndef VIETER_PACKAGE_INFO
+#define VIETER_PACKAGE_INFO
+
+#define FREE_STRING(sp) if (sp != NULL) free(sp)
+
+#include <stdint.h>
+
+#include "vieter_package.h"
+#include "vieter_dynarray.h"
+
+
+typedef struct vieter_package_info {
+	char *name;
+	char *base;
+	char *version;
+	char *description;
+	int64_t size;
+	int64_t csize;
+	char *url;
+	char *arch;
+	int64_t build_date;
+	char *packager;
+	char *pgpsig;
+	int64_t pgpsigsize;
+
+	vieter_dynarray *groups;
+	vieter_dynarray *licenses;
+	vieter_dynarray *replaces;
+	vieter_dynarray *depends;
+	vieter_dynarray *conflicts;
+	vieter_dynarray *provides;
+	vieter_dynarray *optdepends;
+	vieter_dynarray *makedepends;
+	vieter_dynarray *checkdepends;
+} vieter_package_info;
+
+/*
+ * Allocate and initialise a pkg_info pointer to hold .PKGINFO.
+ */
+vieter_package_info *vieter_package_info_init();
+
+/*
+ * Parse .PKGINFO file into something usable by libvieter.
+ */
+void vieter_package_info_parse(vieter_package_info *pkg_info, char *pkg_info_str);
+
+/*
+ * Deallocate a pkg_info pointer. 
+ */
+void vieter_package_info_free(vieter_package_info *pkg_info);
+
+#endif

src/package/vieter_package_internal.h

@@ -0,0 +1,10 @@
+#include "vieter_package.h"
+#include "vieter_package_info.h"
+#include "vieter_dynarray.h"
+
+struct vieter_package {
+	char *path;
+	vieter_package_info *info;
+	vieter_dynarray *files;
+	int compression;
+};

src/tree/vieter_tree.c

@@ -0,0 +1,116 @@
+#include "vieter_tree_balancing.h"
+#include "vieter_tree_internal.h"
+
+vieter_tree *vieter_tree_init() { return calloc(1, sizeof(vieter_tree)); }
+
+uint64_t vieter_tree_size(vieter_tree *tree) { return tree->size; }
+
+vieter_tree_error vieter_tree_insert(vieter_tree *tree, uint64_t key,
+                                     void *data) {
+  if (tree->size == 0) {
+    tree->root = vieter_tree_node_init();
+    tree->root->key = key;
+    tree->root->data = data;
+    vieter_tree_node_set(tree->root, vieter_tree_node_black, true);
+    tree->size = 1;
+
+    return vieter_tree_ok;
+  }
+
+  vieter_tree_error res = vieter_tree_node_insert(tree->root, key, data);
+
+  if (res != vieter_tree_ok) {
+    return res;
+  }
+
+  tree->size++;
+
+  return vieter_tree_ok;
+}
+
+vieter_tree_error vieter_tree_search(void **out, vieter_tree *tree,
+                                     uint64_t key) {
+  if (tree->size == 0) {
+    return vieter_tree_not_present;
+  }
+
+  return vieter_tree_node_search(out, tree->root, key);
+}
+
+vieter_tree_error vieter_tree_remove(void **out, vieter_tree *tree,
+                                     uint64_t key) {
+  if (tree->size == 0) {
+    return vieter_tree_not_present;
+  }
+
+  vieter_tree_error res = vieter_tree_node_remove(out, &tree->root, key);
+
+  if (res != vieter_tree_ok) {
+    return res;
+  }
+
+  tree->size--;
+
+  return vieter_tree_ok;
+}
+
+void vieter_tree_free(vieter_tree *tree) {
+  if (tree->size == 0) {
+    goto end;
+  }
+
+  uint64_t capacity = 4;
+  uint64_t size = 1;
+  vieter_tree_node **stack = malloc(capacity * sizeof(vieter_tree_node *));
+  stack[0] = tree->root;
+
+  vieter_tree_node *node;
+
+  while (size > 0) {
+    node = stack[size - 1];
+    size--;
+
+    if (size + 2 > capacity) {
+      capacity *= 2;
+      stack = realloc(stack, capacity * sizeof(vieter_tree_node *));
+    }
+
+    if (node->children[0] != NULL) {
+      stack[size] = node->children[0];
+      size++;
+    }
+
+    if (node->children[1] != NULL) {
+      stack[size] = node->children[1];
+      size++;
+    }
+
+    vieter_tree_node_free(node);
+  }
+
+  free(stack);
+
+end:
+  free(tree);
+}
+
+bool vieter_tree_validate(vieter_tree *tree) {
+  if (tree->size == 0) {
+    return true;
+  }
+
+  // DFS to get expected black nodes
+  uint64_t expected_black_nodes = 0;
+  vieter_tree_node *node = tree->root;
+
+  while (node != NULL) {
+    if (vieter_tree_node_get(node, vieter_tree_node_black)) {
+      expected_black_nodes++;
+    }
+
+    node = node->children[0];
+  }
+
+  return vieter_tree_node_get(tree->root, vieter_tree_node_black) &&
+         vieter_tree_node_validate(tree->root, 0, expected_black_nodes);
+}

src/tree/vieter_tree_balancing.c

@@ -0,0 +1,289 @@
+#include "vieter_tree_balancing.h"
+#include <string.h>
+
+bool vieter_tree_node_validate(vieter_tree_node *node,
+                               uint64_t passed_black_nodes,
+                               uint64_t expected_black_nodes) {
+  // Path to NULL children should contain the same amount of black nodes
+  if (node == NULL) {
+    return passed_black_nodes == expected_black_nodes;
+  }
+
+  if (vieter_tree_node_get(node, vieter_tree_node_black)) {
+    passed_black_nodes++;
+  }
+
+  // Either the node itself is black, or its children are both either NULL or
+  // black.
+  bool correctly_colored_children =
+      vieter_tree_node_get(node, vieter_tree_node_black) ||
+      ((node->children[0] == NULL ||
+        vieter_tree_node_get(node->children[0], vieter_tree_node_black)) &&
+       (node->children[1] == NULL ||
+        vieter_tree_node_get(node->children[1], vieter_tree_node_black)));
+  bool right_child_flag_set =
+      node->parent == NULL ||
+      (vieter_tree_node_get(node, vieter_tree_node_right) ==
+       (node->parent->children[1] == node));
+
+  return correctly_colored_children && right_child_flag_set &&
+         vieter_tree_node_validate(node->children[0], passed_black_nodes,
+                                   expected_black_nodes) &&
+         vieter_tree_node_validate(node->children[1], passed_black_nodes,
+                                   expected_black_nodes);
+}
+
+/*
+ * This function should be rewritten to use tree rotations instead.
+ */
+vieter_tree_node *vieter_tree_node_balance(vieter_tree_node *node) {
+  vieter_tree_node *parent = node->parent;
+  vieter_tree_node *grand_parent = parent->parent;
+  vieter_tree_node *root = grand_parent;
+  vieter_tree_node *children[2];
+  vieter_tree_node *grand_children[4];
+
+  uint64_t key_root = root->key;
+  void *data_root = root->data;
+
+  if (vieter_tree_node_get(node, vieter_tree_node_right)) {
+    children[0] = parent;
+    children[1] = node;
+
+    if (vieter_tree_node_get(parent, vieter_tree_node_right)) {
+      root->key = parent->key;
+      root->data = parent->data;
+
+      parent->key = key_root;
+      parent->data = data_root;
+
+      grand_children[0] = grand_parent->children[0];
+      grand_children[1] = parent->children[0];
+      grand_children[2] = node->children[0];
+      grand_children[3] = node->children[1];
+    } else {
+      root->key = node->key;
+      root->data = node->data;
+
+      node->key = key_root;
+      node->data = data_root;
+
+      grand_children[0] = parent->children[0];
+      grand_children[1] = node->children[0];
+      grand_children[2] = node->children[1];
+      grand_children[3] = grand_parent->children[1];
+    }
+  } else {
+    children[0] = node;
+    children[1] = parent;
+
+    if (vieter_tree_node_get(parent, vieter_tree_node_right)) {
+      root->key = node->key;
+      root->data = node->data;
+
+      node->key = key_root;
+      node->data = data_root;
+
+      grand_children[0] = grand_parent->children[0];
+      grand_children[1] = node->children[0];
+      grand_children[2] = node->children[1];
+      grand_children[3] = parent->children[1];
+    } else {
+      root->key = parent->key;
+      root->data = parent->data;
+
+      parent->key = key_root;
+      parent->data = data_root;
+
+      grand_children[0] = node->children[0];
+      grand_children[1] = node->children[1];
+      grand_children[2] = parent->children[1];
+      grand_children[3] = grand_parent->children[1];
+    }
+  }
+
+  vieter_tree_node_set(
+      root, vieter_tree_node_right,
+      vieter_tree_node_get(grand_parent, vieter_tree_node_right));
+
+  vieter_tree_node_set(children[0], vieter_tree_node_black, true);
+  vieter_tree_node_set(children[1], vieter_tree_node_black, true);
+
+  vieter_tree_node_set(root, vieter_tree_node_black, false);
+
+  vieter_tree_node_set_children(children[0], grand_children);
+  vieter_tree_node_set_children(children[1], grand_children + 2);
+  vieter_tree_node_set_children(root, children);
+
+  return root;
+}
+
+void vieter_tree_node_balance_after_insert(vieter_tree_node *node) {
+  while (!vieter_tree_node_get(node, vieter_tree_node_black) &&
+         node->parent != NULL &&
+         !vieter_tree_node_get(node->parent, vieter_tree_node_black)) {
+    node = vieter_tree_node_balance(node);
+  }
+
+  // The root must always be black
+  if (node->parent == NULL) {
+    vieter_tree_node_set(node, vieter_tree_node_black, true);
+  }
+}
+
+vieter_tree_node *vieter_tree_node_rotate(vieter_tree_node *old_root,
+                                          bool dir) {
+  vieter_tree_node *new_root = old_root->children[1 - dir];
+
+  if (old_root->parent != NULL) {
+    vieter_tree_node_set_child(
+        old_root->parent, new_root,
+        vieter_tree_node_get(old_root, vieter_tree_node_right));
+  } else {
+    new_root->parent = NULL;
+  }
+
+  // Right rotation
+  if (dir) {
+    vieter_tree_node_set_child(old_root, new_root->children[1], false);
+    vieter_tree_node_set_child(new_root, old_root, true);
+  }
+  // Left rotation
+  else {
+    vieter_tree_node_set_child(old_root, new_root->children[0], true);
+    vieter_tree_node_set_child(new_root, old_root, false);
+  }
+
+  return new_root;
+}
+
+/*
+ * This function is currently implemented by very literally following the
+ * Wikipedia pseudocode. It's honestly not too bad, and I couldn't be bothered
+ * to properly research how to implement red-black removal (how is this so hard
+ * to find?)
+ *
+ * https://en.wikipedia.org/wiki/Red%E2%80%93black_tree#Removal_of_a_black_non-root_leaf
+ */
+vieter_tree_node *vieter_tree_node_remove_balanced(vieter_tree_node *node) {
+  vieter_tree_node *out;
+
+  if (node->parent == NULL) {
+    out = node->children[0] != NULL ? node->children[0] : node->children[1];
+
+    vieter_tree_node_free(node);
+
+    // This only happens when the root was the only element in the tree
+    if (out == NULL)
+      return out;
+
+    vieter_tree_node_set(out, vieter_tree_node_black, true);
+    out->parent = NULL;
+
+    return out;
+  }
+
+  // A red node can only have 0 or 2 children. The node we receive only has
+  // one child at most, so we know if it's red that it doesn't have any
+  // children. A black node that has a single (right) child can be replaced by
+  // this child, granted it becomes black as well. Either way, the node can be
+  // replaced by its right child (even if it's NULL).
+  if (!vieter_tree_node_get(node, vieter_tree_node_black) ||
+      node->children[1] != NULL) {
+    out = node->children[1];
+
+    vieter_tree_node_set_child(
+        node->parent, node->children[1],
+        vieter_tree_node_get(node, vieter_tree_node_right));
+
+    if (node->children[1] != NULL)
+      vieter_tree_node_set(node->children[1], vieter_tree_node_black, true);
+
+    vieter_tree_node_free(node);
+
+    return out;
+  }
+
+  // The complicated case is when we want to remove a black leaf
+  // https://en.wikipedia.org/wiki/Red%E2%80%93black_tree#Removal_of_a_black_non-root_leaf
+
+  out = node;
+  vieter_tree_node *parent = node->parent;
+  vieter_tree_node *sibling, *close_nephew, *distant_nephew;
+  bool dir = vieter_tree_node_get(node, vieter_tree_node_right);
+  parent->children[dir] = NULL;
+
+  vieter_tree_node_free(node);
+
+  goto start;
+
+  do {
+    dir = vieter_tree_node_get(node, vieter_tree_node_right);
+
+  start:
+    sibling = parent->children[1 - dir];
+    distant_nephew = sibling->children[1 - dir];
+    close_nephew = sibling->children[dir];
+
+    if (!vieter_tree_node_get(sibling, vieter_tree_node_black))
+      goto case3;
+
+    if (distant_nephew != NULL &&
+        !vieter_tree_node_get(distant_nephew, vieter_tree_node_black))
+      goto case6;
+
+    if (close_nephew != NULL &&
+        !vieter_tree_node_get(close_nephew, vieter_tree_node_black))
+      goto case5;
+
+    if (!vieter_tree_node_get(parent, vieter_tree_node_black))
+      goto case4;
+
+    // Case 2
+    vieter_tree_node_set(sibling, vieter_tree_node_black, false);
+    node = parent;
+    out = node;
+  } while ((parent = node->parent) != NULL);
+
+  // Case 1
+  return out;
+
+case3:
+  out = vieter_tree_node_rotate(parent, dir);
+  vieter_tree_node_set(parent, vieter_tree_node_black, false);
+  vieter_tree_node_set(sibling, vieter_tree_node_black, true);
+  sibling = close_nephew;
+  distant_nephew = sibling->children[1 - dir];
+
+  if (distant_nephew != NULL &&
+      !vieter_tree_node_get(distant_nephew, vieter_tree_node_black))
+    goto case6;
+
+  close_nephew = sibling->children[dir];
+
+  if (close_nephew != NULL &&
+      !vieter_tree_node_get(close_nephew, vieter_tree_node_black))
+    goto case5;
+
+case4:
+  vieter_tree_node_set(sibling, vieter_tree_node_black, false);
+  vieter_tree_node_set(parent, vieter_tree_node_black, true);
+
+  return out;
+
+case5:
+  vieter_tree_node_rotate(sibling, 1 - dir);
+  vieter_tree_node_set(sibling, vieter_tree_node_black, false);
+  vieter_tree_node_set(close_nephew, vieter_tree_node_black, true);
+  distant_nephew = sibling;
+  sibling = close_nephew;
+
+case6:
+  out = vieter_tree_node_rotate(parent, dir);
+  vieter_tree_node_set(sibling, vieter_tree_node_black,
+                       vieter_tree_node_get(parent, vieter_tree_node_black));
+  vieter_tree_node_set(parent, vieter_tree_node_black, true);
+  vieter_tree_node_set(distant_nephew, vieter_tree_node_black, true);
+
+  return out;
+}

src/tree/vieter_tree_balancing.h

@@ -0,0 +1,46 @@
+#ifndef VIETER_TREE_BALANCING
+#define VIETER_TREE_BALANCING
+
+#include "vieter_tree_node.h"
+
+/*
+ * Check whether the given tree is a valid red-black tree.
+ *
+ * @param node root of the (sub)tree
+ * @param passed_black_nodes how many black nodes the recursion has already seen
+ * at this point. This should be initialized as 0 for the topmost call.
+ * @param expected_black_nodes the correct amount of black nodes to expect when
+ * a NULL child is encountered.
+ * @return true if the tree is valid, false otherwise
+ */
+bool vieter_tree_node_validate(vieter_tree_node *node,
+                               uint64_t passed_black_nodes,
+                               uint64_t expected_black_nodes);
+
+/*
+ * Balance a path of 3 nodes into a complete binary tree, with a red root and
+ * black children.
+ */
+vieter_tree_node *vieter_tree_node_balance(vieter_tree_node *node);
+
+/*
+ * Ensure the tree remains a valid red-black tree after having inserting the
+ * node.
+ */
+void vieter_tree_node_balance_after_insert(vieter_tree_node *node);
+
+/*
+ * Remove the given node, ensuring the tree remains a valid red-black tree.
+ *
+ * @param node node to remove. This should have at most a single child. If node
+ * isn't the root, this should be the right child, otherwise it can be either.
+ * @return root of the subtree that this function operated on. This can
+ * sometimes be the new root of the entire tree.
+ */
+vieter_tree_node *vieter_tree_node_remove_balanced(vieter_tree_node *node);
+
+/*
+ * Perform a tree rotation of the subtree with the given root.
+ */
+vieter_tree_node *vieter_tree_node_rotate(vieter_tree_node *old_root, bool dir);
+#endif

src/tree/vieter_tree_internal.h

@@ -0,0 +1,22 @@
+#include "vieter_tree.h"
+#include "vieter_tree_node.h"
+
+#include <stdbool.h>
+
+struct vieter_tree {
+  uint64_t size;
+  vieter_tree_node *root;
+};
+
+/*
+ * Inspect whether the tree is still a valid red-black-tree.
+ *
+ * @return true if valid, false otherwise.
+ */
+bool vieter_tree_validate(vieter_tree *tree);
+
+struct vieter_tree_iterator {
+  vieter_tree_node *current_node;
+  bool started;
+  bool done;
+};

src/tree/vieter_tree_iterator.c

@@ -0,0 +1,49 @@
+#include "vieter_tree.h"
+#include "vieter_tree_internal.h"
+
+vieter_tree_iterator *vieter_tree_iterator_from(vieter_tree *tree) {
+  vieter_tree_iterator *iter = calloc(1, sizeof(vieter_tree_iterator));
+
+  // An empty tree's iterator will be done immediately
+  if (tree->size == 0) {
+    iter->started = true;
+    iter->done = true;
+
+    return iter;
+  }
+
+  iter->current_node = tree->root;
+
+  return iter;
+}
+
+vieter_tree_error vieter_tree_iterator_next(void **out,
+                                            vieter_tree_iterator *iter) {
+  if (iter->done) {
+    return vieter_tree_iterator_done;
+  }
+
+  if (!iter->started) {
+    while (iter->current_node->children[0] != NULL) {
+      iter->current_node = iter->current_node->children[0];
+    }
+
+    iter->started = true;
+  }
+
+  *out = iter->current_node->data;
+
+  iter->current_node = vieter_tree_node_next(iter->current_node);
+
+  if (iter->current_node == NULL) {
+    iter->done = true;
+  }
+
+  return vieter_tree_ok;
+}
+
+void vieter_tree_iterator_free(vieter_tree_iterator **ptp) {
+  free(*ptp);
+
+  *ptp = NULL;
+}

src/tree/vieter_tree_node.c

@@ -0,0 +1,171 @@
+#include "vieter_tree_node.h"
+#include "vieter_tree_balancing.h"
+
+#include <string.h>
+
+vieter_tree_node *vieter_tree_node_init() {
+  return calloc(1, sizeof(vieter_tree_node));
+}
+
+void vieter_tree_node_free(vieter_tree_node *node) { free(node); }
+
+void vieter_tree_node_add_child(vieter_tree_node *parent, uint64_t key,
+                                vieter_tree_node *child) {
+  if (parent == NULL) {
+    return;
+  }
+
+  bool side = key > parent->key;
+  parent->children[side] = child;
+
+  if (child != NULL) {
+    child->parent = parent;
+    vieter_tree_node_set(child, vieter_tree_node_right, side);
+  }
+}
+
+void vieter_tree_node_set_children(vieter_tree_node *parent,
+                                   vieter_tree_node **children) {
+  memcpy(parent->children, children, 2 * sizeof(vieter_tree_node *));
+
+  for (uint8_t i = 0; i < 2; i++) {
+    if (parent->children[i] != NULL) {
+      parent->children[i]->parent = parent;
+      vieter_tree_node_set(parent->children[i], vieter_tree_node_right, i);
+    }
+  }
+}
+
+void vieter_tree_node_set_child(vieter_tree_node *parent,
+                                vieter_tree_node *child, bool right) {
+  parent->children[right] = child;
+
+  if (child != NULL) {
+    child->parent = parent;
+    vieter_tree_node_set(child, vieter_tree_node_right, right);
+  }
+}
+
+vieter_tree_error vieter_tree_node_insert(vieter_tree_node *root, uint64_t key,
+                                          void *data) {
+  vieter_tree_node *node = root;
+  vieter_tree_node *parent = root;
+
+  while (node != NULL) {
+    if (node->key == key) {
+      return vieter_tree_already_present;
+    }
+
+    parent = node;
+    node = node->children[key > parent->key];
+  }
+
+  vieter_tree_node *new_node = vieter_tree_node_init();
+  new_node->key = key;
+  new_node->data = data;
+
+  vieter_tree_node_add_child(parent, key, new_node);
+  vieter_tree_node_balance_after_insert(new_node);
+
+  return vieter_tree_ok;
+}
+
+vieter_tree_error vieter_tree_node_search_node(vieter_tree_node **out,
+                                               vieter_tree_node *root,
+                                               uint64_t key) {
+  vieter_tree_node *node = root;
+
+  while (node != NULL) {
+    if (node->key == key) {
+      *out = node;
+
+      return vieter_tree_ok;
+    }
+
+    node = node->children[key > node->key];
+  }
+
+  return vieter_tree_not_present;
+}
+
+vieter_tree_error vieter_tree_node_search(void **out, vieter_tree_node *root,
+                                          uint64_t key) {
+  vieter_tree_node *target;
+  vieter_tree_error res = vieter_tree_node_search_node(&target, root, key);
+
+  if (res != vieter_tree_ok) {
+    return res;
+  }
+
+  *out = target->data;
+
+  return vieter_tree_ok;
+}
+
+vieter_tree_error
+vieter_tree_node_remove(void **out, vieter_tree_node **root_ptr, uint64_t key) {
+  vieter_tree_node *target;
+  vieter_tree_error res = vieter_tree_node_search_node(&target, *root_ptr, key);
+
+  if (res != vieter_tree_ok) {
+    return res;
+  }
+
+  *out = target->data;
+  vieter_tree_node *possible_new_root;
+
+  if (target->children[0] != NULL && target->children[1] != NULL) {
+    vieter_tree_node *replacement = target->children[1];
+
+    while (replacement->children[0] != NULL) {
+      replacement = replacement->children[0];
+    }
+
+    target->key = replacement->key;
+    target->data = replacement->data;
+
+    possible_new_root = vieter_tree_node_remove_balanced(replacement);
+  } else {
+    possible_new_root = vieter_tree_node_remove_balanced(target);
+  }
+
+  if (possible_new_root == NULL) {
+    *root_ptr = NULL;
+  } else if (possible_new_root->parent == NULL) {
+    *root_ptr = possible_new_root;
+  }
+
+  return vieter_tree_ok;
+}
+
+void vieter_tree_node_set(vieter_tree_node *node, vieter_tree_node_flag flag,
+                          bool set) {
+  if (set) {
+    node->flags |= flag;
+  } else {
+    node->flags &= ~flag;
+  }
+}
+
+bool vieter_tree_node_get(vieter_tree_node *node, vieter_tree_node_flag flag) {
+  return (node->flags & flag) != 0;
+}
+
+vieter_tree_node *vieter_tree_node_next(vieter_tree_node *node) {
+  if (node->children[1] != NULL) {
+    node = node->children[1];
+
+    while (node->children[0] != NULL) {
+      node = node->children[0];
+    }
+
+    return node;
+  }
+
+  while (node->parent != NULL &&
+         vieter_tree_node_get(node, vieter_tree_node_right)) {
+    node = node->parent;
+  }
+
+  return node->parent;
+}

src/tree/vieter_tree_node.h

@@ -0,0 +1,94 @@
+#ifndef VIETER_TREE_NODE
+#define VIETER_TREE_NODE
+
+#include "vieter_tree.h"
+#include <stdbool.h>
+#include <stdint.h>
+
+typedef enum vieter_tree_node_flag {
+  vieter_tree_node_black = ((uint8_t)1) << 0,
+  // This flag is used to index the children array. If this flag isn't set,
+  // it'll evaluate to false, or index 0 in the children array.
+  vieter_tree_node_right = ((uint8_t)1) << 1
+} vieter_tree_node_flag;
+
+typedef struct vieter_tree_node {
+  uint64_t key;
+  void *data;
+  struct vieter_tree_node *parent;
+  struct vieter_tree_node *children[2];
+  uint8_t flags;
+} vieter_tree_node;
+
+/*
+ * Allocate a new node.
+ */
+vieter_tree_node *vieter_tree_node_init();
+
+/*
+ * Free an allocated node.
+ */
+void vieter_tree_node_free(vieter_tree_node *node);
+
+/*
+ * Insert a new key into the given tree.
+ */
+vieter_tree_error vieter_tree_node_insert(vieter_tree_node *root, uint64_t key,
+                                          void *data);
+
+/*
+ * Return the node representing the requested value.
+ */
+vieter_tree_error vieter_tree_node_search_node(vieter_tree_node **out,
+                                               vieter_tree_node *root,
+                                               uint64_t key);
+
+/*
+ * Search for the data represented by the given key.
+ */
+vieter_tree_error vieter_tree_node_search(void **out, vieter_tree_node *root,
+                                          uint64_t key);
+
+/*
+ * Remove the data associated with the given key.
+ */
+vieter_tree_error
+vieter_tree_node_remove(void **out, vieter_tree_node **root_ptr, uint64_t key);
+
+/*
+ * Set a node's bit flag to the given value.
+ */
+void vieter_tree_node_set(vieter_tree_node *node, vieter_tree_node_flag flag,
+                          bool value);
+
+/*
+ * Get whether a node's bit flag is set.
+ */
+bool vieter_tree_node_get(vieter_tree_node *node, vieter_tree_node_flag flag);
+
+/*
+ * Add a new child to the parent, replacing either its left or right child,
+ * depending on the key values.
+ */
+void vieter_tree_node_add_child(vieter_tree_node *parent, uint64_t key,
+                                vieter_tree_node *child);
+
+/*
+ * Replace a node's children array.
+ */
+void vieter_tree_node_set_children(vieter_tree_node *parent,
+                                   vieter_tree_node **children);
+
+/*
+ * Set a node's left or right child to the given node.
+ */
+void vieter_tree_node_set_child(vieter_tree_node *parent,
+                                vieter_tree_node *child, bool right);
+
+/*
+ * Return the in-order successor of the given node, or NULL if it's the last
+ * node in the tree.
+ */
+vieter_tree_node *vieter_tree_node_next(vieter_tree_node *node);
+
+#endif

test/cron/test_parse.c

@@ -1,7 +1,7 @@
 #include "acutest.h"
 #include "vieter_cron.h"
 
-void test_not_allowed() {
+void test_illegal_expressions() {
     char *expressions[] = {
         "4 *-7",
         "4 *-7/4",
@@ -33,6 +33,6 @@ void test_not_allowed() {
 }
 
 TEST_LIST = {
-    {"not_allowed", test_not_allowed},
+    {"cron illegal expressions", test_illegal_expressions},
     {NULL, NULL}
 };

test/cron/test_parse_part.c

@@ -0,0 +1,43 @@
+#include "acutest.h"
+#include "vieter_cron_parse.h"
+
+struct parse_test {
+    char *part;
+    uint8_t min;
+    uint8_t max;
+};
+
+void test_illegal_parts() {
+    struct parse_test parts[] = {
+        { "*-7", 0, 23 },
+        { "*-7/4", 0, 23 },
+        { "7/*", 0, 23 },
+        { "/5", 0, 23 },
+        { "4~6", 0, 23 },
+        { "5/2-5", 0, 23 },
+        { "1/2/3", 0, 23 },
+        { "*5", 0, 59 },
+        { "x", 0, 59 },
+        { NULL, 0, 0 }
+    };
+
+    int i = 0;
+    uint64_t out;
+    char *s;
+
+    while (parts[i].part != NULL) {
+        // Function modifies string in-place
+        s = strdup(parts[i].part);
+
+        TEST_CHECK_(vieter_cron_expr_parse_part(&out, s, parts[i].min, parts[i].max) != vieter_cron_parse_ok, "%s (%i - %i)", parts[i].part, parts[i].min, parts[i].max);
+
+        free(s);
+
+        i++;
+    }
+}
+
+TEST_LIST = {
+    {"cron illegal parts", test_illegal_parts},
+    {NULL, NULL}
+};

test/heap/test_heap.c

@@ -178,10 +178,10 @@ void test_pop_random() {
 }
 
 TEST_LIST = {
-    {"init", test_init},
-    {"insert", test_insert},
-    {"insert random", test_insert_random},
-    {"pop", test_pop},
-    {"pop random", test_pop_random},
+    {"heap init", test_init},
+    {"heap insert", test_insert},
+    {"heap insert random", test_insert_random},
+    {"heap pop", test_pop},
+    {"heap pop random", test_pop_random},
     {NULL, NULL}
 };

test/heap/test_merge.c

@@ -23,6 +23,6 @@ void test_merge_same_order() {
 }
 
 TEST_LIST = {
-    {"merge same order", test_merge_same_order},
+    {"heap merge same order", test_merge_same_order},
     {NULL, NULL}
 };

test/package/.PKGINFO

@@ -0,0 +1,22 @@
+# Generated by makepkg 6.0.2
+# using fakeroot version 1.30.1
+pkgname = xcursor-dmz
+pkgbase = xcursor-dmz
+pkgver = 0.4.5-2
+pkgdesc = Style neutral, scalable cursor theme
+url = https://packages.debian.org/sid/dmz-cursor-theme
+builddate = 1673751613
+packager = Unknown Packager
+size = 3469584
+arch = any
+license = MIT
+replaces = test1
+group = x11
+conflict = test2
+conflict = test3
+provides = test4
+depend = test5
+depend = test6
+optdepend = test7
+makedepend = xorg-xcursorgen
+checkdepend = test8

test/package/desc

@@ -0,0 +1,45 @@
+%FILENAME%
+xcursor-dmz-0.4.5-2-any.pkg.tar.zst
+
+%NAME%
+xcursor-dmz
+
+%BASE%
+xcursor-dmz
+
+%VERSION%
+0.4.5-2
+
+%DESC%
+Style neutral, scalable cursor theme
+
+%GROUPS%
+x11
+
+%CSIZE%
+328282
+
+%ISIZE%
+3469584
+
+%SHA256SUM%
+4f4bce9e975334ed7775ff4ddf4d2e82e411d599802f6179a122f89149f53bfb
+
+%URL%
+https://packages.debian.org/sid/dmz-cursor-theme
+
+%LICENSE%
+MIT
+
+%ARCH%
+any
+
+%BUILDDATE%
+1673751613
+
+%PACKAGER%
+Unknown Packager
+
+%MAKEDEPENDS%
+xorg-xcursorgen
+

test/package/files

@@ -0,0 +1,243 @@
+%FILES%
+usr/
+usr/share/
+usr/share/icons/
+usr/share/icons/DMZ-Black/
+usr/share/icons/DMZ-Black/cursor.theme
+usr/share/icons/DMZ-Black/cursors/
+usr/share/icons/DMZ-Black/cursors/00008160000006810000408080010102
+usr/share/icons/DMZ-Black/cursors/028006030e0e7ebffc7f7070c0600140
+usr/share/icons/DMZ-Black/cursors/03b6e0fcb3499374a867c041f52298f0
+usr/share/icons/DMZ-Black/cursors/08e8e1c95fe2fc01f976f1e063a24ccd
+usr/share/icons/DMZ-Black/cursors/1081e37283d90000800003c07f3ef6bf
+usr/share/icons/DMZ-Black/cursors/14fef782d02440884392942c11205230
+usr/share/icons/DMZ-Black/cursors/2870a09082c103050810ffdffffe0204
+usr/share/icons/DMZ-Black/cursors/3085a0e285430894940527032f8b26df
+usr/share/icons/DMZ-Black/cursors/3ecb610c1bf2410f44200f48c40d3599
+usr/share/icons/DMZ-Black/cursors/4498f0e0c1937ffe01fd06f973665830
+usr/share/icons/DMZ-Black/cursors/5c6cd98b3f3ebcb1f9c7f1c204630408
+usr/share/icons/DMZ-Black/cursors/6407b0e94181790501fd1e167b474872
+usr/share/icons/DMZ-Black/cursors/640fb0e74195791501fd1ed57b41487f
+usr/share/icons/DMZ-Black/cursors/9081237383d90e509aa00f00170e968f
+usr/share/icons/DMZ-Black/cursors/9d800788f1b08800ae810202380a0822
+usr/share/icons/DMZ-Black/cursors/X_cursor
+usr/share/icons/DMZ-Black/cursors/alias
+usr/share/icons/DMZ-Black/cursors/arrow
+usr/share/icons/DMZ-Black/cursors/bd_double_arrow
+usr/share/icons/DMZ-Black/cursors/bottom_left_corner
+usr/share/icons/DMZ-Black/cursors/bottom_right_corner
+usr/share/icons/DMZ-Black/cursors/bottom_side
+usr/share/icons/DMZ-Black/cursors/bottom_tee
+usr/share/icons/DMZ-Black/cursors/c7088f0f3e6c8088236ef8e1e3e70000
+usr/share/icons/DMZ-Black/cursors/circle
+usr/share/icons/DMZ-Black/cursors/col-resize
+usr/share/icons/DMZ-Black/cursors/color-picker
+usr/share/icons/DMZ-Black/cursors/copy
+usr/share/icons/DMZ-Black/cursors/cross
+usr/share/icons/DMZ-Black/cursors/cross_reverse
+usr/share/icons/DMZ-Black/cursors/crossed_circle
+usr/share/icons/DMZ-Black/cursors/crosshair
+usr/share/icons/DMZ-Black/cursors/d9ce0ab605698f320427677b458ad60b
+usr/share/icons/DMZ-Black/cursors/default
+usr/share/icons/DMZ-Black/cursors/diamond_cross
+usr/share/icons/DMZ-Black/cursors/dnd-ask
+usr/share/icons/DMZ-Black/cursors/dnd-copy
+usr/share/icons/DMZ-Black/cursors/dnd-link
+usr/share/icons/DMZ-Black/cursors/dnd-move
+usr/share/icons/DMZ-Black/cursors/dnd-none
+usr/share/icons/DMZ-Black/cursors/dot_box_mask
+usr/share/icons/DMZ-Black/cursors/dotbox
+usr/share/icons/DMZ-Black/cursors/double_arrow
+usr/share/icons/DMZ-Black/cursors/draft_large
+usr/share/icons/DMZ-Black/cursors/draft_small
+usr/share/icons/DMZ-Black/cursors/draped_box
+usr/share/icons/DMZ-Black/cursors/e-resize
+usr/share/icons/DMZ-Black/cursors/e29285e634086352946a0e7090d73106
+usr/share/icons/DMZ-Black/cursors/ew-resize
+usr/share/icons/DMZ-Black/cursors/fcf1c3c7cd4491d801f1e1c78f100000
+usr/share/icons/DMZ-Black/cursors/fd_double_arrow
+usr/share/icons/DMZ-Black/cursors/fleur
+usr/share/icons/DMZ-Black/cursors/grab
+usr/share/icons/DMZ-Black/cursors/grabbing
+usr/share/icons/DMZ-Black/cursors/h_double_arrow
+usr/share/icons/DMZ-Black/cursors/hand
+usr/share/icons/DMZ-Black/cursors/hand1
+usr/share/icons/DMZ-Black/cursors/hand2
+usr/share/icons/DMZ-Black/cursors/help
+usr/share/icons/DMZ-Black/cursors/icon
+usr/share/icons/DMZ-Black/cursors/left_ptr
+usr/share/icons/DMZ-Black/cursors/left_ptr_help
+usr/share/icons/DMZ-Black/cursors/left_ptr_watch
+usr/share/icons/DMZ-Black/cursors/left_side
+usr/share/icons/DMZ-Black/cursors/left_tee
+usr/share/icons/DMZ-Black/cursors/link
+usr/share/icons/DMZ-Black/cursors/ll_angle
+usr/share/icons/DMZ-Black/cursors/lr_angle
+usr/share/icons/DMZ-Black/cursors/move
+usr/share/icons/DMZ-Black/cursors/n-resize
+usr/share/icons/DMZ-Black/cursors/ne-resize
+usr/share/icons/DMZ-Black/cursors/nesw-resize
+usr/share/icons/DMZ-Black/cursors/not-allowed
+usr/share/icons/DMZ-Black/cursors/ns-resize
+usr/share/icons/DMZ-Black/cursors/nw-resize
+usr/share/icons/DMZ-Black/cursors/nwse-resize
+usr/share/icons/DMZ-Black/cursors/openhand
+usr/share/icons/DMZ-Black/cursors/pencil
+usr/share/icons/DMZ-Black/cursors/pirate
+usr/share/icons/DMZ-Black/cursors/plus
+usr/share/icons/DMZ-Black/cursors/pointer
+usr/share/icons/DMZ-Black/cursors/progress
+usr/share/icons/DMZ-Black/cursors/question_arrow
+usr/share/icons/DMZ-Black/cursors/right_ptr
+usr/share/icons/DMZ-Black/cursors/right_side
+usr/share/icons/DMZ-Black/cursors/right_tee
+usr/share/icons/DMZ-Black/cursors/row-resize
+usr/share/icons/DMZ-Black/cursors/s-resize
+usr/share/icons/DMZ-Black/cursors/sb_down_arrow
+usr/share/icons/DMZ-Black/cursors/sb_h_double_arrow
+usr/share/icons/DMZ-Black/cursors/sb_left_arrow
+usr/share/icons/DMZ-Black/cursors/sb_right_arrow
+usr/share/icons/DMZ-Black/cursors/sb_up_arrow
+usr/share/icons/DMZ-Black/cursors/sb_v_double_arrow
+usr/share/icons/DMZ-Black/cursors/se-resize
+usr/share/icons/DMZ-Black/cursors/size_bdiag
+usr/share/icons/DMZ-Black/cursors/size_fdiag
+usr/share/icons/DMZ-Black/cursors/size_hor
+usr/share/icons/DMZ-Black/cursors/size_ver
+usr/share/icons/DMZ-Black/cursors/sw-resize
+usr/share/icons/DMZ-Black/cursors/target
+usr/share/icons/DMZ-Black/cursors/tcross
+usr/share/icons/DMZ-Black/cursors/text
+usr/share/icons/DMZ-Black/cursors/top_left_arrow
+usr/share/icons/DMZ-Black/cursors/top_left_corner
+usr/share/icons/DMZ-Black/cursors/top_right_corner
+usr/share/icons/DMZ-Black/cursors/top_side
+usr/share/icons/DMZ-Black/cursors/top_tee
+usr/share/icons/DMZ-Black/cursors/ul_angle
+usr/share/icons/DMZ-Black/cursors/ur_angle
+usr/share/icons/DMZ-Black/cursors/v_double_arrow
+usr/share/icons/DMZ-Black/cursors/w-resize
+usr/share/icons/DMZ-Black/cursors/wait
+usr/share/icons/DMZ-Black/cursors/watch
+usr/share/icons/DMZ-Black/cursors/xterm
+usr/share/icons/DMZ-White/
+usr/share/icons/DMZ-White/cursor.theme
+usr/share/icons/DMZ-White/cursors/
+usr/share/icons/DMZ-White/cursors/00008160000006810000408080010102
+usr/share/icons/DMZ-White/cursors/028006030e0e7ebffc7f7070c0600140
+usr/share/icons/DMZ-White/cursors/03b6e0fcb3499374a867c041f52298f0
+usr/share/icons/DMZ-White/cursors/08e8e1c95fe2fc01f976f1e063a24ccd
+usr/share/icons/DMZ-White/cursors/1081e37283d90000800003c07f3ef6bf
+usr/share/icons/DMZ-White/cursors/14fef782d02440884392942c11205230
+usr/share/icons/DMZ-White/cursors/2870a09082c103050810ffdffffe0204
+usr/share/icons/DMZ-White/cursors/3085a0e285430894940527032f8b26df
+usr/share/icons/DMZ-White/cursors/3ecb610c1bf2410f44200f48c40d3599
+usr/share/icons/DMZ-White/cursors/4498f0e0c1937ffe01fd06f973665830
+usr/share/icons/DMZ-White/cursors/5c6cd98b3f3ebcb1f9c7f1c204630408
+usr/share/icons/DMZ-White/cursors/6407b0e94181790501fd1e167b474872
+usr/share/icons/DMZ-White/cursors/640fb0e74195791501fd1ed57b41487f
+usr/share/icons/DMZ-White/cursors/9081237383d90e509aa00f00170e968f
+usr/share/icons/DMZ-White/cursors/9d800788f1b08800ae810202380a0822
+usr/share/icons/DMZ-White/cursors/X_cursor
+usr/share/icons/DMZ-White/cursors/alias
+usr/share/icons/DMZ-White/cursors/arrow
+usr/share/icons/DMZ-White/cursors/bd_double_arrow
+usr/share/icons/DMZ-White/cursors/bottom_left_corner
+usr/share/icons/DMZ-White/cursors/bottom_right_corner
+usr/share/icons/DMZ-White/cursors/bottom_side
+usr/share/icons/DMZ-White/cursors/bottom_tee
+usr/share/icons/DMZ-White/cursors/c7088f0f3e6c8088236ef8e1e3e70000
+usr/share/icons/DMZ-White/cursors/circle
+usr/share/icons/DMZ-White/cursors/col-resize
+usr/share/icons/DMZ-White/cursors/color-picker
+usr/share/icons/DMZ-White/cursors/copy
+usr/share/icons/DMZ-White/cursors/cross
+usr/share/icons/DMZ-White/cursors/cross_reverse
+usr/share/icons/DMZ-White/cursors/crossed_circle
+usr/share/icons/DMZ-White/cursors/crosshair
+usr/share/icons/DMZ-White/cursors/d9ce0ab605698f320427677b458ad60b
+usr/share/icons/DMZ-White/cursors/default
+usr/share/icons/DMZ-White/cursors/diamond_cross
+usr/share/icons/DMZ-White/cursors/dnd-ask
+usr/share/icons/DMZ-White/cursors/dnd-copy
+usr/share/icons/DMZ-White/cursors/dnd-link
+usr/share/icons/DMZ-White/cursors/dnd-move
+usr/share/icons/DMZ-White/cursors/dnd-none
+usr/share/icons/DMZ-White/cursors/dot_box_mask
+usr/share/icons/DMZ-White/cursors/dotbox
+usr/share/icons/DMZ-White/cursors/double_arrow
+usr/share/icons/DMZ-White/cursors/draft_large
+usr/share/icons/DMZ-White/cursors/draft_small
+usr/share/icons/DMZ-White/cursors/draped_box
+usr/share/icons/DMZ-White/cursors/e-resize
+usr/share/icons/DMZ-White/cursors/e29285e634086352946a0e7090d73106
+usr/share/icons/DMZ-White/cursors/ew-resize
+usr/share/icons/DMZ-White/cursors/fcf1c3c7cd4491d801f1e1c78f100000
+usr/share/icons/DMZ-White/cursors/fd_double_arrow
+usr/share/icons/DMZ-White/cursors/fleur
+usr/share/icons/DMZ-White/cursors/grab
+usr/share/icons/DMZ-White/cursors/grabbing
+usr/share/icons/DMZ-White/cursors/h_double_arrow
+usr/share/icons/DMZ-White/cursors/hand
+usr/share/icons/DMZ-White/cursors/hand1
+usr/share/icons/DMZ-White/cursors/hand2
+usr/share/icons/DMZ-White/cursors/help
+usr/share/icons/DMZ-White/cursors/icon
+usr/share/icons/DMZ-White/cursors/left_ptr
+usr/share/icons/DMZ-White/cursors/left_ptr_help
+usr/share/icons/DMZ-White/cursors/left_ptr_watch
+usr/share/icons/DMZ-White/cursors/left_side
+usr/share/icons/DMZ-White/cursors/left_tee
+usr/share/icons/DMZ-White/cursors/link
+usr/share/icons/DMZ-White/cursors/ll_angle
+usr/share/icons/DMZ-White/cursors/lr_angle
+usr/share/icons/DMZ-White/cursors/move
+usr/share/icons/DMZ-White/cursors/n-resize
+usr/share/icons/DMZ-White/cursors/ne-resize
+usr/share/icons/DMZ-White/cursors/nesw-resize
+usr/share/icons/DMZ-White/cursors/not-allowed
+usr/share/icons/DMZ-White/cursors/ns-resize
+usr/share/icons/DMZ-White/cursors/nw-resize
+usr/share/icons/DMZ-White/cursors/nwse-resize
+usr/share/icons/DMZ-White/cursors/openhand
+usr/share/icons/DMZ-White/cursors/pencil
+usr/share/icons/DMZ-White/cursors/pirate
+usr/share/icons/DMZ-White/cursors/plus
+usr/share/icons/DMZ-White/cursors/pointer
+usr/share/icons/DMZ-White/cursors/progress
+usr/share/icons/DMZ-White/cursors/question_arrow
+usr/share/icons/DMZ-White/cursors/right_ptr
+usr/share/icons/DMZ-White/cursors/right_side
+usr/share/icons/DMZ-White/cursors/right_tee
+usr/share/icons/DMZ-White/cursors/row-resize
+usr/share/icons/DMZ-White/cursors/s-resize
+usr/share/icons/DMZ-White/cursors/sb_down_arrow
+usr/share/icons/DMZ-White/cursors/sb_h_double_arrow
+usr/share/icons/DMZ-White/cursors/sb_left_arrow
+usr/share/icons/DMZ-White/cursors/sb_right_arrow
+usr/share/icons/DMZ-White/cursors/sb_up_arrow
+usr/share/icons/DMZ-White/cursors/sb_v_double_arrow
+usr/share/icons/DMZ-White/cursors/se-resize
+usr/share/icons/DMZ-White/cursors/size_bdiag
+usr/share/icons/DMZ-White/cursors/size_fdiag
+usr/share/icons/DMZ-White/cursors/size_hor
+usr/share/icons/DMZ-White/cursors/size_ver
+usr/share/icons/DMZ-White/cursors/sw-resize
+usr/share/icons/DMZ-White/cursors/target
+usr/share/icons/DMZ-White/cursors/tcross
+usr/share/icons/DMZ-White/cursors/text
+usr/share/icons/DMZ-White/cursors/top_left_arrow
+usr/share/icons/DMZ-White/cursors/top_left_corner
+usr/share/icons/DMZ-White/cursors/top_right_corner
+usr/share/icons/DMZ-White/cursors/top_side
+usr/share/icons/DMZ-White/cursors/top_tee
+usr/share/icons/DMZ-White/cursors/ul_angle
+usr/share/icons/DMZ-White/cursors/ur_angle
+usr/share/icons/DMZ-White/cursors/v_double_arrow
+usr/share/icons/DMZ-White/cursors/w-resize
+usr/share/icons/DMZ-White/cursors/wait
+usr/share/icons/DMZ-White/cursors/watch
+usr/share/icons/DMZ-White/cursors/xterm
+usr/share/licenses/
+usr/share/licenses/xcursor-dmz/
+usr/share/licenses/xcursor-dmz/LICENSE

test/package/test_package.c

@@ -0,0 +1,97 @@
+#include "acutest.h"
+#include "vieter_package_internal.h"
+
+void test_info_parse() {
+    FILE *f = fopen("./test/package/.PKGINFO", "r");
+	TEST_ASSERT_(f != NULL, "could not find test .PKGINFO file in ./test/package ");
+	fseek(f, 0L, SEEK_END);
+	size_t size = ftell(f);
+	fflush(stdout);
+	rewind(f);
+	char *pkg_info_str = malloc(size + 1);
+	fread(pkg_info_str, 1, size, f);
+	pkg_info_str[size] = '\0';
+	fclose(f);
+
+	vieter_package_info *pkg_info = vieter_package_info_init();
+	vieter_package_info_parse(pkg_info, pkg_info_str);
+
+	TEST_CHECK(!strcmp(pkg_info->name, "xcursor-dmz"));
+	TEST_CHECK(!strcmp(pkg_info->base, "xcursor-dmz"));
+	TEST_CHECK(!strcmp(pkg_info->version, "0.4.5-2"));
+	TEST_CHECK(!strcmp(pkg_info->description, "Style neutral, scalable cursor theme"));
+	TEST_CHECK(!strcmp(pkg_info->url, "https://packages.debian.org/sid/dmz-cursor-theme"));
+	TEST_CHECK(pkg_info->build_date == 1673751613);
+	TEST_CHECK(!strcmp(pkg_info->packager, "Unknown Packager"));
+	TEST_CHECK(pkg_info->size == 3469584);
+	TEST_CHECK(!strcmp(pkg_info->arch, "any"));
+
+	TEST_CHECK(!strcmp(pkg_info->licenses->array[0], "MIT"));
+	TEST_CHECK(!strcmp(pkg_info->replaces->array[0], "test1"));
+	TEST_CHECK(!strcmp(pkg_info->groups->array[0], "x11"));
+	TEST_CHECK(!strcmp(pkg_info->conflicts->array[0], "test2"));
+	TEST_CHECK(!strcmp(pkg_info->conflicts->array[1], "test3"));
+	TEST_CHECK(!strcmp(pkg_info->provides->array[0], "test4"));
+	TEST_CHECK(!strcmp(pkg_info->depends->array[0], "test5"));
+	TEST_CHECK(!strcmp(pkg_info->depends->array[1], "test6"));
+	TEST_CHECK(!strcmp(pkg_info->optdepends->array[0], "test7"));
+	TEST_CHECK(!strcmp(pkg_info->makedepends->array[0], "xorg-xcursorgen"));
+	TEST_CHECK(!strcmp(pkg_info->checkdepends->array[0], "test8"));
+
+	free(pkg_info_str);
+	vieter_package_info_free(pkg_info);
+}
+
+void test_pkg_read_archive_files() {
+	vieter_package *pkg = vieter_package_init();
+	vieter_package_error e = vieter_package_read_archive(pkg, "./test/package/xcursor-dmz-0.4.5-2-any.pkg.tar.zst");
+	TEST_ASSERT_(e == vieter_package_ok, "failure parsing pkg archive");
+
+	FILE *f = fopen("./test/package/files", "r");
+	TEST_ASSERT_(f != NULL, "could not find test files file in ./test/package");
+	char buff[128];
+	size_t i = 0;
+
+	while ((fgets(buff, 128, f)) != NULL || i < pkg->files->size) {
+		if (buff[strlen(buff) - 1] == '\n') {
+			buff[strlen(buff) - 1] = '\0';
+		}
+
+		TEST_CHECK_(!strcmp(pkg->files->array[i], buff), "%s != %s", pkg->files->array[i], buff);
+		i++;
+	}
+	TEST_CHECK(pkg->compression = 14);
+
+	vieter_package_free(&pkg);
+}
+
+void test_pkg_read_archive_desc() {
+	vieter_package *pkg = vieter_package_init();
+	vieter_package_error e = vieter_package_read_archive(pkg, "./test/package/xcursor-dmz-0.4.5-2-any.pkg.tar.zst");
+	TEST_ASSERT_(e == vieter_package_ok, "failure parsing pkg archive");
+
+	char *description = vieter_package_to_description(pkg);
+
+	FILE *f = fopen("./test/package/desc", "r");
+	TEST_ASSERT_(f != NULL, "could not find test desc file in ./test/package");
+	fseek(f, 0, SEEK_END);
+	size_t size = ftell(f);
+	rewind(f);
+	char *desc = malloc(size + 1);
+	fread(desc, 1, size, f);
+	desc[size] = '\0';
+	fclose(f);
+
+	TEST_CHECK(!strcmp(description, desc));
+
+	vieter_package_free(&pkg);
+	free(description);
+	free(desc);
+}
+
+TEST_LIST = {
+	{".PKGINFO parse", test_info_parse},
+	{"files array creation", test_pkg_read_archive_files},
+	{"desc file creation", test_pkg_read_archive_desc},
+	{NULL, NULL}
+};

test/tree/test_balancing.c

@@ -0,0 +1,71 @@
+#include "acutest.h"
+#include "vieter_tree_internal.h"
+#include "vieter_tree_node.h"
+#include "vieter_tree_balancing.h"
+
+// This uses the examples from wikipedia
+// https://en.wikipedia.org/wiki/Tree_rotation
+
+void test_rotate_right() {
+    vieter_tree_node *a = vieter_tree_node_init();
+    vieter_tree_node *b = vieter_tree_node_init();
+    vieter_tree_node *p = vieter_tree_node_init();
+
+    vieter_tree_node_set_child(p, a, false);
+    vieter_tree_node_set_child(p, b, true);
+
+    vieter_tree_node *c = vieter_tree_node_init();
+    vieter_tree_node *q = vieter_tree_node_init();
+
+    vieter_tree_node_set_child(q, p, false);
+    vieter_tree_node_set_child(q, c, true);
+
+    vieter_tree_node *new_root = vieter_tree_node_rotate(q, true);
+
+    TEST_CHECK(new_root == p);
+    TEST_CHECK(new_root->children[0] == a);
+    TEST_CHECK(new_root->children[1] == q);
+    TEST_CHECK(new_root->children[1]->children[0] == b);
+    TEST_CHECK(new_root->children[1]->children[1] == c);
+
+    vieter_tree_node_free(a);
+    vieter_tree_node_free(b);
+    vieter_tree_node_free(p);
+    vieter_tree_node_free(c);
+    vieter_tree_node_free(q);
+}
+
+void test_rotate_left() {
+    vieter_tree_node *b = vieter_tree_node_init();
+    vieter_tree_node *c = vieter_tree_node_init();
+    vieter_tree_node *q = vieter_tree_node_init();
+
+    vieter_tree_node_set_child(q, b, false);
+    vieter_tree_node_set_child(q, c, true);
+
+    vieter_tree_node *a = vieter_tree_node_init();
+    vieter_tree_node *p = vieter_tree_node_init();
+
+    vieter_tree_node_set_child(p, a, false);
+    vieter_tree_node_set_child(p, q, true);
+
+    vieter_tree_node *new_root = vieter_tree_node_rotate(p, false);
+
+    TEST_CHECK(new_root == q);
+    TEST_CHECK(new_root->children[0] == p);
+    TEST_CHECK(new_root->children[1] == c);
+    TEST_CHECK(new_root->children[0]->children[0] == a);
+    TEST_CHECK(new_root->children[0]->children[1] == b);
+
+    vieter_tree_node_free(a);
+    vieter_tree_node_free(b);
+    vieter_tree_node_free(p);
+    vieter_tree_node_free(c);
+    vieter_tree_node_free(q);
+}
+
+TEST_LIST = {
+    {"tree rotate right", test_rotate_right},
+    {"tree rotate left", test_rotate_left},
+    {NULL, NULL}
+};

test/tree/test_tree.c

@@ -0,0 +1,72 @@
+#include "acutest.h"
+#include "vieter_tree_internal.h"
+
+#define TEST_SIZE(tree, size) \
+    TEST_CHECK(vieter_tree_size(tree) == size); \
+    TEST_MSG("Size: %zu", vieter_tree_size(tree))
+
+void test_init() {
+    vieter_tree *tree = vieter_tree_init();
+    TEST_CHECK(tree != NULL);
+    TEST_SIZE(tree, 0);
+    vieter_tree_free(tree);
+}
+
+void test_insert() {
+    vieter_tree *tree = vieter_tree_init();
+
+    for (uint64_t i = 0; i < 250; i++) {
+        TEST_CHECK(vieter_tree_insert(tree, i, (void *)i) == vieter_tree_ok);
+        TEST_SIZE(tree, i + 1);
+        TEST_CHECK(vieter_tree_validate(tree));
+    }
+
+    vieter_tree_iterator *iter = vieter_tree_iterator_from(tree);
+
+    void *out = NULL;
+
+    for (uint64_t i = 0; i < 250; i++) {
+        TEST_CHECK(vieter_tree_search(&out, tree, i) == vieter_tree_ok);
+        TEST_CHECK(out == (void *)i);
+        TEST_CHECK(vieter_tree_insert(tree, i, NULL) == vieter_tree_already_present);
+        TEST_CHECK(vieter_tree_search(&out, tree, i) == vieter_tree_ok);
+
+        out = NULL;
+
+        TEST_CHECK(vieter_tree_iterator_next(&out, iter) == vieter_tree_ok);
+        TEST_CHECK(out == (void *)i);
+    }
+
+    TEST_CHECK(vieter_tree_iterator_next(&out, iter) == vieter_tree_iterator_done);
+
+    vieter_tree_iterator_free(&iter);
+    vieter_tree_free(tree);
+}
+
+void test_remove() {
+    vieter_tree *tree = vieter_tree_init();
+
+    for (uint64_t i = 0; i < 250; i++) {
+        TEST_CHECK(vieter_tree_insert(tree, i, NULL) == vieter_tree_ok);
+        TEST_CHECK(vieter_tree_validate(tree));
+    }
+
+    void *out;
+
+    for (uint64_t i = 0; i < 250; i++) {
+        TEST_CHECK(vieter_tree_search(&out, tree, i) == vieter_tree_ok);
+        TEST_CHECK(vieter_tree_remove(&out, tree, i) == vieter_tree_ok);
+        TEST_CHECK(vieter_tree_validate(tree));
+        TEST_CHECK(vieter_tree_search(&out, tree, i) == vieter_tree_not_present);
+        TEST_SIZE(tree, 250 - i - 1);
+    }
+
+    vieter_tree_free(tree);
+}
+
+TEST_LIST = {
+    {"tree init", test_init},
+    {"tree insert", test_insert},
+    {"tree remove", test_remove},
+    {NULL, NULL}
+};

test/tree/test_tree_random.c

@@ -0,0 +1,59 @@
+#include "acutest.h"
+#include "vieter_tree_internal.h"
+
+#define TEST_SIZE(tree, size) \
+    TEST_CHECK(vieter_tree_size(tree) == size); \
+    TEST_MSG("Size: %zu", vieter_tree_size(tree))
+
+int uint64_t_compare(const void *a, const void *b) {
+    if ((*(uint64_t *)a) < (*(uint64_t *)b)) {
+        return -1;
+    } else if ((*(uint64_t *)a) > (*(uint64_t *)b)) {
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+void test_insert_random() {
+    const uint64_t n = 1000;
+    srand(0);
+
+    vieter_tree *tree = vieter_tree_init();
+
+    uint64_t *numbers = malloc(n * sizeof(uint64_t));
+    uint64_t num;
+    void *out = NULL;
+
+    for (uint64_t i = 0; i < n; i++) {
+        num = rand();
+        vieter_tree_insert(tree, num, (void *)num);
+        TEST_SIZE(tree, i + 1);
+        TEST_CHECK(vieter_tree_validate(tree));
+        TEST_CHECK(vieter_tree_search(&out, tree, num) == vieter_tree_ok);
+        TEST_CHECK(out == (void *)num);
+
+        out = NULL;
+
+        numbers[i] = num;
+    }
+
+    qsort(numbers, n, sizeof(uint64_t), uint64_t_compare);
+
+    vieter_tree_iterator *iter = vieter_tree_iterator_from(tree);
+    out = NULL;
+
+    for (uint64_t i = 0; i < n; i++) {
+        TEST_CHECK(vieter_tree_iterator_next(&out, iter) == vieter_tree_ok);
+        TEST_CHECK(out == (void *)numbers[i]);
+    }
+
+    free(numbers);
+    vieter_tree_iterator_free(&iter);
+    vieter_tree_free(tree);
+}
+
+TEST_LIST = {
+    {"tree insert random", test_insert_random},
+    {NULL, NULL}
+};

thirdparty/include/sha256.h

@@ -0,0 +1,34 @@
+/*********************************************************************
+* Filename:   sha256.h
+* Author:     Brad Conte (brad AT bradconte.com)
+* Copyright:
+* Disclaimer: This code is presented "as is" without any guarantees.
+* Details:    Defines the API for the corresponding SHA1 implementation.
+*********************************************************************/
+
+#ifndef SHA256_H
+#define SHA256_H
+
+/*************************** HEADER FILES ***************************/
+#include <stddef.h>
+
+/****************************** MACROS ******************************/
+#define SHA256_BLOCK_SIZE 32            // SHA256 outputs a 32 byte digest
+
+/**************************** DATA TYPES ****************************/
+typedef unsigned char BYTE;             // 8-bit byte
+typedef unsigned int  WORD;             // 32-bit word, change to "long" for 16-bit machines
+
+typedef struct {
+	BYTE data[64];
+	WORD datalen;
+	unsigned long long bitlen;
+	WORD state[8];
+} SHA256_CTX;
+
+/*********************** FUNCTION DECLARATIONS **********************/
+void sha256_init(SHA256_CTX *ctx);
+void sha256_update(SHA256_CTX *ctx, const BYTE data[], size_t len);
+void sha256_final(SHA256_CTX *ctx, BYTE hash[]);
+
+#endif   // SHA256_H

thirdparty/src/sha256.c

@@ -0,0 +1,158 @@
+/*********************************************************************
+* Filename:   sha256.c
+* Author:     Brad Conte (brad AT bradconte.com)
+* Copyright:
+* Disclaimer: This code is presented "as is" without any guarantees.
+* Details:    Implementation of the SHA-256 hashing algorithm.
+              SHA-256 is one of the three algorithms in the SHA2
+              specification. The others, SHA-384 and SHA-512, are not
+              offered in this implementation.
+              Algorithm specification can be found here:
+               * http://csrc.nist.gov/publications/fips/fips180-2/fips180-2withchangenotice.pdf
+              This implementation uses little endian byte order.
+*********************************************************************/
+
+/*************************** HEADER FILES ***************************/
+#include <stdlib.h>
+#include <memory.h>
+#include "sha256.h"
+
+/****************************** MACROS ******************************/
+#define ROTLEFT(a,b) (((a) << (b)) | ((a) >> (32-(b))))
+#define ROTRIGHT(a,b) (((a) >> (b)) | ((a) << (32-(b))))
+
+#define CH(x,y,z) (((x) & (y)) ^ (~(x) & (z)))
+#define MAJ(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
+#define EP0(x) (ROTRIGHT(x,2) ^ ROTRIGHT(x,13) ^ ROTRIGHT(x,22))
+#define EP1(x) (ROTRIGHT(x,6) ^ ROTRIGHT(x,11) ^ ROTRIGHT(x,25))
+#define SIG0(x) (ROTRIGHT(x,7) ^ ROTRIGHT(x,18) ^ ((x) >> 3))
+#define SIG1(x) (ROTRIGHT(x,17) ^ ROTRIGHT(x,19) ^ ((x) >> 10))
+
+/**************************** VARIABLES *****************************/
+static const WORD k[64] = {
+	0x428a2f98,0x71374491,0xb5c0fbcf,0xe9b5dba5,0x3956c25b,0x59f111f1,0x923f82a4,0xab1c5ed5,
+	0xd807aa98,0x12835b01,0x243185be,0x550c7dc3,0x72be5d74,0x80deb1fe,0x9bdc06a7,0xc19bf174,
+	0xe49b69c1,0xefbe4786,0x0fc19dc6,0x240ca1cc,0x2de92c6f,0x4a7484aa,0x5cb0a9dc,0x76f988da,
+	0x983e5152,0xa831c66d,0xb00327c8,0xbf597fc7,0xc6e00bf3,0xd5a79147,0x06ca6351,0x14292967,
+	0x27b70a85,0x2e1b2138,0x4d2c6dfc,0x53380d13,0x650a7354,0x766a0abb,0x81c2c92e,0x92722c85,
+	0xa2bfe8a1,0xa81a664b,0xc24b8b70,0xc76c51a3,0xd192e819,0xd6990624,0xf40e3585,0x106aa070,
+	0x19a4c116,0x1e376c08,0x2748774c,0x34b0bcb5,0x391c0cb3,0x4ed8aa4a,0x5b9cca4f,0x682e6ff3,
+	0x748f82ee,0x78a5636f,0x84c87814,0x8cc70208,0x90befffa,0xa4506ceb,0xbef9a3f7,0xc67178f2
+};
+
+/*********************** FUNCTION DEFINITIONS ***********************/
+void sha256_transform(SHA256_CTX *ctx, const BYTE data[])
+{
+	WORD a, b, c, d, e, f, g, h, i, j, t1, t2, m[64];
+
+	for (i = 0, j = 0; i < 16; ++i, j += 4)
+		m[i] = (data[j] << 24) | (data[j + 1] << 16) | (data[j + 2] << 8) | (data[j + 3]);
+	for ( ; i < 64; ++i)
+		m[i] = SIG1(m[i - 2]) + m[i - 7] + SIG0(m[i - 15]) + m[i - 16];
+
+	a = ctx->state[0];
+	b = ctx->state[1];
+	c = ctx->state[2];
+	d = ctx->state[3];
+	e = ctx->state[4];
+	f = ctx->state[5];
+	g = ctx->state[6];
+	h = ctx->state[7];
+
+	for (i = 0; i < 64; ++i) {
+		t1 = h + EP1(e) + CH(e,f,g) + k[i] + m[i];
+		t2 = EP0(a) + MAJ(a,b,c);
+		h = g;
+		g = f;
+		f = e;
+		e = d + t1;
+		d = c;
+		c = b;
+		b = a;
+		a = t1 + t2;
+	}
+
+	ctx->state[0] += a;
+	ctx->state[1] += b;
+	ctx->state[2] += c;
+	ctx->state[3] += d;
+	ctx->state[4] += e;
+	ctx->state[5] += f;
+	ctx->state[6] += g;
+	ctx->state[7] += h;
+}
+
+void sha256_init(SHA256_CTX *ctx)
+{
+	ctx->datalen = 0;
+	ctx->bitlen = 0;
+	ctx->state[0] = 0x6a09e667;
+	ctx->state[1] = 0xbb67ae85;
+	ctx->state[2] = 0x3c6ef372;
+	ctx->state[3] = 0xa54ff53a;
+	ctx->state[4] = 0x510e527f;
+	ctx->state[5] = 0x9b05688c;
+	ctx->state[6] = 0x1f83d9ab;
+	ctx->state[7] = 0x5be0cd19;
+}
+
+void sha256_update(SHA256_CTX *ctx, const BYTE data[], size_t len)
+{
+	WORD i;
+
+	for (i = 0; i < len; ++i) {
+		ctx->data[ctx->datalen] = data[i];
+		ctx->datalen++;
+		if (ctx->datalen == 64) {
+			sha256_transform(ctx, ctx->data);
+			ctx->bitlen += 512;
+			ctx->datalen = 0;
+		}
+	}
+}
+
+void sha256_final(SHA256_CTX *ctx, BYTE hash[])
+{
+	WORD i;
+
+	i = ctx->datalen;
+
+	// Pad whatever data is left in the buffer.
+	if (ctx->datalen < 56) {
+		ctx->data[i++] = 0x80;
+		while (i < 56)
+			ctx->data[i++] = 0x00;
+	}
+	else {
+		ctx->data[i++] = 0x80;
+		while (i < 64)
+			ctx->data[i++] = 0x00;
+		sha256_transform(ctx, ctx->data);
+		memset(ctx->data, 0, 56);
+	}
+
+	// Append to the padding the total message's length in bits and transform.
+	ctx->bitlen += ctx->datalen * 8;
+	ctx->data[63] = ctx->bitlen;
+	ctx->data[62] = ctx->bitlen >> 8;
+	ctx->data[61] = ctx->bitlen >> 16;
+	ctx->data[60] = ctx->bitlen >> 24;
+	ctx->data[59] = ctx->bitlen >> 32;
+	ctx->data[58] = ctx->bitlen >> 40;
+	ctx->data[57] = ctx->bitlen >> 48;
+	ctx->data[56] = ctx->bitlen >> 56;
+	sha256_transform(ctx, ctx->data);
+
+	// Since this implementation uses little endian byte ordering and SHA uses big endian,
+	// reverse all the bytes when copying the final state to the output hash.
+	for (i = 0; i < 4; ++i) {
+		hash[i]      = (ctx->state[0] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 4]  = (ctx->state[1] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 8]  = (ctx->state[2] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 12] = (ctx->state[3] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 16] = (ctx->state[4] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 20] = (ctx->state[5] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 24] = (ctx->state[6] >> (24 - i * 8)) & 0x000000ff;
+		hash[i + 28] = (ctx->state[7] >> (24 - i * 8)) & 0x000000ff;
+	}
+}