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!171 ftruncate新增支持FAT12与FAT16 

Merge pull request !171 from JING/ftruncate
This commit is contained in:
openharmony_ci 2021-04-22 15:21:21 +08:00 committed by Gitee
parent 3e5dec4dc9 3027cfe543
commit dc90400456
2 changed files with 17 additions and 2 deletions
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15
fs/fat/os_adapt/fatfs.c
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@ -171,6 +171,19 @@ int fatfs_2_vfs(int result)
return status;
}
static bool fatfs_is_last_cluster(FATFS *fs, DWORD cclust)
{
switch (fs->fs_type) {
case FS_FAT12:
return (cclust == FAT12_END_OF_CLUSTER);
case FS_FAT16:
return (cclust == FAT16_END_OF_CLUSTER);
case FS_FAT32:
default:
return (cclust == FAT32_END_OF_CLUSTER);
}
}
static int fatfs_sync(unsigned long mountflags, FATFS *fs)
{
#ifdef LOSCFG_FS_FAT_CACHE
@ -806,7 +819,7 @@ static FRESULT realloc_cluster(FILINFO *finfo, FFOBJID *obj, FSIZE_t size)
if ((cclust == BAD_CLUSTER) || (cclust == DISK_ERROR)) {
return FR_DISK_ERR;
}
if (cclust != END_OF_FILE) { /* Remove extra cluster if existing */
if (!fatfs_is_last_cluster(obj->fs, cclust)) { /* Remove extra cluster if existing */
result = remove_chain(obj, cclust, pclust);
if (result != FR_OK) {
return result;

4
fs/fat/os_adapt/fatfs.h
View File

@ -55,7 +55,9 @@ extern "C" {
#define FAT32_MAXSIZE 0x100000000
#define BAD_CLUSTER 0x7FFFFFFF
#define DISK_ERROR 0xFFFFFFFF
#define END_OF_FILE 0x0FFFFFFF
#define FAT12_END_OF_CLUSTER 0x00000FFF
#define FAT16_END_OF_CLUSTER 0x0000FFFF
#define FAT32_END_OF_CLUSTER 0x0FFFFFFF
#define FAT_ERROR (-1)
/* MBR */