--- /dev/null
+// ISC License
+//
+// Copyright (c) 2024 Stephen Seo
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+// PERFORMANCE OF THIS SOFTWARE.
+
+#include "http_template.h"
+
+// Standard library includes.
+#include <string.h>
+#include <stdlib.h>
+
+// Third party includes.
+#include <SimpleArchiver/src/data_structures/linked_list.h>
+#include <SimpleArchiver/src/helpers.h>
+
+typedef struct C_SIMPLE_HTTP_INTERNAL_Template_Node {
+ char *html;
+ size_t html_size;
+ union {
+ size_t orig_end_idx;
+ size_t html_capacity;
+ };
+ SDArchiverLinkedList *forced_next;
+} C_SIMPLE_HTTP_INTERNAL_Template_Node;
+
+void c_simple_http_internal_free_template_node(void *data) {
+ C_SIMPLE_HTTP_INTERNAL_Template_Node *node = data;
+ if (node) {
+ if (node->html) {
+ free(node->html);
+ }
+ if (node->forced_next) {
+ simple_archiver_list_free(&node->forced_next);
+ }
+ free(node);
+ }
+}
+
+void c_simple_http_internal_cleanup_template_node(
+ C_SIMPLE_HTTP_INTERNAL_Template_Node **node) {
+ if (node && *node) {
+ c_simple_http_internal_free_template_node(*node);
+ *node = NULL;
+ }
+}
+
+int c_simple_http_internal_get_final_size_fn(void *data, void *ud) {
+ size_t *final_size = ud;
+ C_SIMPLE_HTTP_INTERNAL_Template_Node *node = data;
+ *final_size += node->html_size;
+ return 0;
+}
+
+int c_simple_http_internal_fill_buf_fn(void *data, void *ud) {
+ C_SIMPLE_HTTP_INTERNAL_Template_Node *node = data;
+ C_SIMPLE_HTTP_INTERNAL_Template_Node *to_fill = ud;
+ if (to_fill->html_capacity < to_fill->html_size + node->html_size) {
+ return 1;
+ }
+ memcpy(
+ to_fill->html + to_fill->html_size,
+ node->html,
+ node->html_size);
+ to_fill->html_size += node->html_size;
+ return 0;
+}
+
+char *c_simple_http_path_to_generated(
+ const char *path,
+ const C_SIMPLE_HTTP_HTTPTemplates *templates) {
+ C_SIMPLE_HTTP_ParsedConfig *wrapped_hash_map =
+ simple_archiver_hash_map_get(templates->hash_map, path, strlen(path) + 1);
+ if (!wrapped_hash_map) {
+ return NULL;
+ }
+ __attribute__((cleanup(simple_archiver_helper_cleanup_c_string)))
+ char *html_buf = NULL;
+ size_t html_buf_size = 0;
+ const char *html_filename =
+ simple_archiver_hash_map_get(wrapped_hash_map->hash_map, "HTML_FILE", 10);
+ if (html_filename) {
+ __attribute__((cleanup(simple_archiver_helper_cleanup_FILE)))
+ FILE *f = fopen(html_filename, "r");
+ if (!f) {
+ return NULL;
+ }
+ if (fseek(f, 0, SEEK_END) != 0) {
+ return NULL;
+ }
+ long html_file_size = ftell(f);
+ if (html_file_size <= 0) {
+ return NULL;
+ }
+ if (fseek(f, 0, SEEK_SET) != 0) {
+ return NULL;
+ }
+ html_buf = malloc(html_file_size + 1);
+ size_t ret = fread(html_buf, 1, html_file_size, f);
+ if (ret != (size_t)html_file_size) {
+ return NULL;
+ }
+ html_buf[html_file_size] = 0;
+ html_buf_size = html_file_size;
+ } else {
+ char *stored_html =
+ simple_archiver_hash_map_get(wrapped_hash_map->hash_map, "HTML", 5);
+ if (!stored_html) {
+ return NULL;
+ }
+ size_t stored_html_size = strlen(stored_html) + 1;
+ html_buf = malloc(stored_html_size);
+ memcpy(html_buf, stored_html, stored_html_size);
+ html_buf_size = stored_html_size;
+ }
+
+ // At this point, html_buf contains the raw HTML as a C-string.
+ __attribute__((cleanup(simple_archiver_list_free)))
+ SDArchiverLinkedList *template_html_list = simple_archiver_list_init();
+
+ size_t idx = 0;
+ size_t last_template_idx = 0;
+
+ __attribute__((cleanup(c_simple_http_internal_cleanup_template_node)))
+ C_SIMPLE_HTTP_INTERNAL_Template_Node *template_node = NULL;
+
+ size_t delimeter_count = 0;
+
+ // xxxx xxx0 - Initial state, no delimeter reached.
+ // xxxx xxx1 - Three "{" delimeters reached.
+ unsigned int state = 0;
+
+ for (; idx < html_buf_size; ++idx) {
+ if ((state & 1) == 0) {
+ // Using 0x7B instead of left curly-brace due to bug in vim navigation.
+ if (html_buf[idx] == 0x7B) {
+ ++delimeter_count;
+ if (delimeter_count >= 3) {
+ delimeter_count = 0;
+ state |= 1;
+ if (template_html_list->count != 0) {
+ C_SIMPLE_HTTP_INTERNAL_Template_Node *last_node =
+ template_html_list->tail->prev->data;
+ last_template_idx = last_node->orig_end_idx;
+ }
+ template_node = malloc(sizeof(C_SIMPLE_HTTP_INTERNAL_Template_Node));
+ template_node->html = malloc(idx - last_template_idx);
+ memcpy(template_node->html, html_buf + idx, idx - last_template_idx);
+ template_node->html_size = idx - last_template_idx;
+ template_node->orig_end_idx = idx + 1;
+ template_node->forced_next = NULL;
+ simple_archiver_list_add(template_html_list, template_node,
+ c_simple_http_internal_free_template_node);
+ template_node = NULL;
+ }
+ } else {
+ delimeter_count = 0;
+ }
+ } else {
+ // (state & 1) is 1
+ // Using 0x7D instead of right curly-brace due to bug in vim navigation.
+ if (html_buf[idx] == 0x7D) {
+ ++delimeter_count;
+ if (delimeter_count >= 3) {
+ delimeter_count = 0;
+ state &= 0xFFFFFFFE;
+ C_SIMPLE_HTTP_INTERNAL_Template_Node *last_node =
+ template_html_list->tail->prev->data;
+ size_t end_of_var_size =
+ idx - last_node->orig_end_idx;
+ if (end_of_var_size <= 6) {
+ fprintf(
+ stderr,
+ "ERROR generating from html template, invalid delimeter at index "
+ "%lu!\n",
+ idx);
+ return NULL;
+ }
+ size_t var_size = end_of_var_size - 6;
+ char *var = malloc(var_size + 1);
+ memcpy(
+ var,
+ html_buf + last_node->orig_end_idx + 3,
+ var_size);
+ var[var_size] = 0;
+ const char *value_c_str =
+ simple_archiver_hash_map_get(
+ wrapped_hash_map->hash_map,
+ var,
+ var_size + 1);
+ // TODO Impl. loading from file instead of directly from value.
+ // Perhaps do this if "var" ends with "_FILE".
+ if (value_c_str) {
+ template_node =
+ malloc(sizeof(C_SIMPLE_HTTP_INTERNAL_Template_Node));
+ size_t size = strlen(value_c_str);
+ template_node->html = malloc(size);
+ memcpy(template_node->html, value_c_str, size);
+ template_node->html_size = size;
+ template_node->orig_end_idx = idx + 1;
+ template_node->forced_next = NULL;
+ } else {
+ template_node =
+ malloc(sizeof(C_SIMPLE_HTTP_INTERNAL_Template_Node));
+ template_node->html = NULL;
+ template_node->html_size = 0;
+ template_node->orig_end_idx = idx + 1;
+ template_node->forced_next = NULL;
+ }
+ simple_archiver_list_add(template_html_list, template_node,
+ c_simple_http_internal_free_template_node);
+ template_node = NULL;
+ }
+ } else {
+ delimeter_count = 0;
+ }
+ }
+ }
+
+ if (template_html_list->count != 0) {
+ C_SIMPLE_HTTP_INTERNAL_Template_Node *last_node =
+ template_html_list->tail->prev->data;
+ if (idx > last_node->orig_end_idx) {
+ template_node = malloc(sizeof(C_SIMPLE_HTTP_INTERNAL_Template_Node));
+ size_t size = idx - last_node->orig_end_idx;
+ template_node->html = malloc(size);
+ memcpy(template_node->html, html_buf + last_node->orig_end_idx, size);
+ template_node->html_size = size;
+ template_node->orig_end_idx = idx + 1;
+ template_node->forced_next = NULL;
+ simple_archiver_list_add(template_html_list, template_node,
+ c_simple_http_internal_free_template_node);
+ template_node = NULL;
+
+ last_node = template_html_list->tail->prev->data;
+ }
+ size_t final_size = 0;
+ simple_archiver_list_get(
+ template_html_list,
+ c_simple_http_internal_get_final_size_fn,
+ &final_size);
+ if (final_size == 0) {
+ fprintf(stderr, "ERROR final_size calculated as ZERO from templates!\n");
+ return NULL;
+ }
+ C_SIMPLE_HTTP_INTERNAL_Template_Node to_fill;
+ to_fill.html = malloc(final_size);
+ to_fill.html_size = 0;
+ to_fill.html_capacity = final_size;
+ if (simple_archiver_list_get(
+ template_html_list,
+ c_simple_http_internal_fill_buf_fn,
+ &to_fill) != NULL) {
+ fprintf(stderr, "ERROR internal issue processing final html buffer!\n");
+ free(to_fill.html);
+ return NULL;
+ }
+ return to_fill.html;
+ } else {
+ // Prevent cleanup fn from "free"ing html_buf and return it verbatim.
+ char *buf = html_buf;
+ html_buf = NULL;
+ return buf;
+ }
+}
+
+// vim: ts=2 sts=2 sw=2
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