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Updated word of god

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This commit is contained in:
Chris
2026-02-06 21:46:51 +01:00
parent cb2af7f06b
commit d2e7808cfa
11 changed files with 103 additions and 30 deletions
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26
src/kernel/fat32.c
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@@ -273,6 +273,7 @@ FAT32_FileHandle* fat32_open(const char *path, const char *mode) {
handle->valid = true;
handle->cluster = entry->start_cluster;
handle->start_cluster = entry->start_cluster;
handle->position = 0;
handle->size = entry->size;
@@ -283,6 +284,17 @@ FAT32_FileHandle* fat32_open(const char *path, const char *mode) {
} else {
handle->mode = 2; // append
handle->position = entry->size;
// Walk to the correct cluster for the current position
uint32_t current_cluster = handle->start_cluster;
uint32_t pos = 0;
while (pos + FAT32_CLUSTER_SIZE <= handle->position) {
uint32_t next = fat_table[current_cluster];
if (next >= 0xFFFFFFF8) break;
current_cluster = next;
pos += FAT32_CLUSTER_SIZE;
}
handle->cluster = current_cluster;
}
return handle;
@@ -342,8 +354,18 @@ int fat32_write(FAT32_FileHandle *handle, const void *buffer, int size) {
int bytes_written = 0;
const uint8_t *buf = (const uint8_t *)buffer;
uint32_t initial_cluster = handle->cluster;
// Check if we are at a cluster boundary from a previous write
if (handle->position > 0 && (handle->position % FAT32_CLUSTER_SIZE) == 0) {
uint32_t next = fat_table[handle->cluster];
if (next >= 0xFFFFFFF8) {
next = allocate_cluster();
if (!next) return 0;
fat_table[handle->cluster] = next;
}
handle->cluster = next;
}
while (bytes_written < size) {
uint32_t offset_in_cluster = handle->position % FAT32_CLUSTER_SIZE;
int to_write = size - bytes_written;
@@ -379,7 +401,7 @@ int fat32_write(FAT32_FileHandle *handle, const void *buffer, int size) {
// Update file entry
for (int i = 0; i < MAX_FILES; i++) {
if (files[i].used && files[i].start_cluster == initial_cluster) {
if (files[i].used && files[i].start_cluster == handle->start_cluster) {
files[i].size = handle->size;
break;
}