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internals: Support characters beyond the first unicode plane (WIP)

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We used 16-bit variables to store the 'character code' everywhere but
this won't let us represent anything beyond U+FFFF.

This patch changes those variables to a custom type that can be 32 or 16
bits depending on the build, and adjusts numerous internal APIs and
datastructures to match.  This includes:

 * utf8decode() and friends
 * on-screen keyboard
 * font manipulation, caching, rendering, and generation
 * VFAT code parses and generates utf16 dirents
 * WIN32 simulator reads and writes utf16 filenames

Note that this patch doesn't _enable_ >16bit unicode support; a followup
patch will turn that on for appropriate targets.

Known bugs:

  * Native players in 32-bit unicode mode generate mangled filename
    entries if they include UTF16 surrogate codepoints.  Root cause
    is unclear, and may reside in core dircache code.

Needs testing on:

 * windows simulator (16bit+32bit)

Change-Id: I193a00fe2a11a4181ddc82df2d71be52bf00b6e6
This commit is contained in:
Solomon Peachy 2024-12-17 08:55:21 -05:00
parent 94712b34d4
commit d05c59f35b
44 changed files with 480 additions and 335 deletions
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5
firmware/include/rbunicode.h
View file

@ -27,7 +27,7 @@
*/
#ifndef _RBUNICODE_H_
#define _RBUNICODE_H_
#include "config.h"
#include <stdbool.h>
@ -63,8 +63,9 @@ unsigned char* utf16LEdecode(const unsigned char *utf16, unsigned char *utf8, in
unsigned char* utf16BEdecode(const unsigned char *utf16, unsigned char *utf8, int count);
unsigned char* utf16decode(const unsigned char *utf16, unsigned char *utf8, int count, int utf8_size, bool le);
bool utf16_has_bom(const unsigned char *utf16, bool *le);
unsigned long utf16len_utf8(const unsigned char *utf8);
unsigned long utf8length(const unsigned char *utf8);
const unsigned char* utf8decode(const unsigned char *utf8, unsigned short *ucs);
const unsigned char* utf8decode(const unsigned char *utf8, ucschar_t *ucs);
void set_codepage(int cp);
int get_codepage(void);
int utf8seek(const unsigned char* utf8, int offset);