mirror of
https://github.com/TerryCavanagh/VVVVVV.git
synced 2024-06-17 10:08:29 +02:00
0ed2cb1bc0
A relevant paragraph copied from the original commit history: The idea is that we store all strings somewhere managed, and then the hashmap only needs pointers to those strings. For storing strings, I created a `Textbook` structure, which consists of one or more 50 KB "pages" (allocated as needed) on which you can simply write strings in both languages back-to-back with `textbook_store(textbook, text)` and get pointers to each of them. (I was originally going to just use one big buffer and realloc to double the size when filled up, but then the hashmap would be full of dangling pointers...) When needed, like when switching to a different language, an entire textbook can be freed at once. This commit is part of rewritten history of the localization branch. The original (unsquashed) commit history can be found here: https://github.com/Dav999-v/VVVVVV/tree/localization-orig
112 lines
2.5 KiB
C
112 lines
2.5 KiB
C
#include "Textbook.h"
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#include <SDL.h>
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#include "Vlogging.h"
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void textbook_init(Textbook* textbook)
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{
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textbook->pages_used = 0;
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textbook->protect = false;
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}
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void textbook_clear(Textbook* textbook)
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{
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if (textbook->protect)
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{
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return;
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}
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for (short p = 0; p < textbook->pages_used; p++)
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{
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SDL_free(textbook->page[p]);
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}
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textbook->pages_used = 0;
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}
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void textbook_set_protected(Textbook* textbook, bool protect)
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{
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/* A protected textbook is silently not cleared when requested.
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* Not a memory leak as long as you unprotect and clear at some point. */
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textbook->protect = protect;
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}
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const void* textbook_store_raw(Textbook* textbook, const void* data, size_t data_len)
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{
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if (data == NULL)
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{
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return NULL;
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}
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if (data_len > TEXTBOOK_PAGE_SIZE)
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{
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vlog_warn(
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"Cannot store data of %ld bytes in Textbook, max page size is %d",
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data_len,
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TEXTBOOK_PAGE_SIZE
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);
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return NULL;
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}
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/* Find a suitable page to place our text on */
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short found_page = -1;
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for (short p = 0; p < textbook->pages_used; p++)
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{
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size_t free = TEXTBOOK_PAGE_SIZE - textbook->page_len[p];
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if (data_len <= free)
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{
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found_page = p;
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break;
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}
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}
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if (found_page == -1)
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{
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/* Create a new page then */
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found_page = textbook->pages_used;
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if (found_page >= TEXTBOOK_MAX_PAGES)
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{
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vlog_warn(
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"Textbook is full! %hd pages used (%d chars per page)",
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textbook->pages_used,
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TEXTBOOK_PAGE_SIZE
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);
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return NULL;
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}
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textbook->page[found_page] = (char*) SDL_malloc(TEXTBOOK_PAGE_SIZE);
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if (textbook->page[found_page] == NULL)
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{
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return NULL;
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}
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textbook->page_len[found_page] = 0;
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textbook->pages_used++;
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}
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size_t cursor = textbook->page_len[found_page];
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char* added_text = &textbook->page[found_page][cursor];
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SDL_memcpy(added_text, data, data_len);
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textbook->page_len[found_page] += data_len;
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return added_text;
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}
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const char* textbook_store(Textbook* textbook, const char* text)
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{
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if (text == NULL)
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{
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return NULL;
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}
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if (text[0] == '\0')
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{
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/* Don't go and store a single null terminator when we have one right here for you: */
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return "";
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}
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return textbook_store_raw(textbook, text, SDL_strlen(text)+1);
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}
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