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nxdt_utils: revert NT_MAX_FILENAME_LENGTH change

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Treats NT_MAX_FILENAME_LENGTH as codepoints instead of bytes, again.
This commit is contained in:
Pablo Curiel 2023-07-17 23:19:17 +02:00
parent ae420b3c7b
commit 3b4477262b
1 changed files with 13 additions and 14 deletions
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27
source/core/nxdt_utils.c
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@ -33,7 +33,6 @@
#include "fatfs/ff.h"
/* Reference: https://docs.microsoft.com/en-us/windows/win32/fileio/filesystem-functionality-comparison#limits. */
/* Actually expressed in bytes, not codepoints. */
#define NT_MAX_FILENAME_LENGTH 255
/* Type definitions. */
@ -110,7 +109,7 @@ static void utilsOverclockSystemAppletHook(AppletHookType hook, void *param);
static void utilsChangeHomeButtonBlockStatus(bool block);
static size_t utilsGetUtf8StringLimit(const char *str, size_t str_size, size_t byte_limit);
static size_t utilsGetUtf8CodepointCount(const char *str, size_t str_size, size_t cp_limit, size_t *last_cp_pos);
bool utilsInitializeResources(const int program_argc, const char **program_argv)
{
@ -912,10 +911,11 @@ char *utilsGeneratePath(const char *prefix, const char *filename, const char *ex
/* Get current path element size. */
size_t element_size = (ptr2 ? (size_t)(ptr2 - ptr1) : (path_len - (size_t)(ptr1 - path)));
/* Get UTF-8 string limit. */
/* Use NT_MAX_FILENAME_LENGTH as the byte count limit. */
size_t last_cp_pos = utilsGetUtf8StringLimit(ptr1, element_size, NT_MAX_FILENAME_LENGTH);
if (last_cp_pos < element_size)
/* Get UTF-8 codepoint count. */
/* Use NT_MAX_FILENAME_LENGTH as the codepoint count limit. */
size_t last_cp_pos = 0;
size_t cp_count = utilsGetUtf8CodepointCount(ptr1, element_size, NT_MAX_FILENAME_LENGTH, &last_cp_pos);
if (cp_count > NT_MAX_FILENAME_LENGTH)
{
if (ptr2)
{
@ -1274,26 +1274,25 @@ NX_INLINE void utilsCloseFileDescriptor(int *fd)
*fd = -1;
}
static size_t utilsGetUtf8StringLimit(const char *str, size_t str_size, size_t byte_limit)
static size_t utilsGetUtf8CodepointCount(const char *str, size_t str_size, size_t cp_limit, size_t *last_cp_pos)
{
if (!str || !*str || !str_size || !byte_limit) return 0;
if (byte_limit > str_size) return str_size;
if (!str || !*str || !str_size || (!cp_limit && last_cp_pos) || (cp_limit && !last_cp_pos)) return 0;
u32 code = 0;
ssize_t units = 0;
size_t cur_pos = 0, last_cp_pos = 0;
size_t cur_pos = 0, cp_count = 0;
const u8 *str_u8 = (const u8*)str;
while(cur_pos < str_size && cur_pos < byte_limit)
while(cur_pos < str_size)
{
units = decode_utf8(&code, str_u8 + cur_pos);
size_t new_pos = (cur_pos + (size_t)units);
if (units < 0 || !code || new_pos > str_size) break;
cp_count++;
cur_pos = new_pos;
if (cur_pos < byte_limit) last_cp_pos = cur_pos;
if (cp_limit && last_cp_pos && cp_count < cp_limit) *last_cp_pos = cur_pos;
}
return last_cp_pos;
return cp_count;
}