refactor: move dynarray into own module

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

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 $(INC_DIRS) '$(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
@@ -50,6 +56,9 @@ $(BUILD_DIR)/$(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
@@ -71,7 +80,7 @@ build-test: $(BINS_TEST)
 
 $(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

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

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/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;
+};

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}
+};

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;
+	}
+}