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KimisOS
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Adjustments to functionality of write_file(), finished read_file()

This commit is contained in:
notsomeidiot123 2025-03-13 12:41:18 -04:00
parent 583eb3ed1e
commit 1c5799cc50
1 changed files with 22 additions and 9 deletions
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31
tools/diskwrite.c
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@ -126,23 +126,36 @@ void write_cluster_value(fat_info *info, uint32_t value, uint32_t cluster){
info->file_table[cluster + i * info->bpb.sectors_per_fat * (info->bpb.bytes_per_sector/4)] = value;
}
}
//read size bytes into buffer. If file is null, will read from root directory.
int read_file(fat_info *info, file_t *file, buffer_t *buffer, size_t size, FILE *disk){
if(!file){
uint32_t first_cluster = info->bpb.root_dir_cluster;
uint32_t next_cluster = first_cluster;
// while
return 1;
file_t root_file = {0};
root_file.start_cluster_high = info->bpb.root_dir_cluster>>16;
root_file.start_cluster_low = info->bpb.root_dir_cluster&0xffff;
file = &root_file;
}
uint32_t first_cluster = file->start_cluster_low | (file->start_cluster_high << 16);
uint32_t clusters = (size / (info->bpb.bytes_per_sector * info->bpb.sectors_per_cluster )) + 1;
uint8_t *new_buffer = calloc(1, clusters * (info->bpb.bytes_per_sector * info->bpb.sectors_per_cluster));
uint32_t cluster = first_cluster;
for(uint32_t i = 0; i < clusters; i++){
if(cluster = -1){
return i * info->bpb.bytes_per_sector * info->bpb.sectors_per_cluster;
}
printf("Reading cluster: %d", cluster);
read_sector(disk, info->bpb.reserved_sectors + info->bpb.partition_start + (cluster * info->bpb.sectors_per_cluster), info->bpb.sectors_per_cluster, buffer + (i *info->bpb.bytes_per_sector * info->bpb.sectors_per_cluster));
cluster = info->file_table[cluster];
verbose && printf("Next cluster: %d", cluster);
}
}
//write size bytes to file from buffer. no value may be zero or null.
//write size bytes to file from buffer. no value may be zero or null. If file is null, will write to root directory
int write_file(fat_info *info, file_t *file, buffer_t *buffer, size_t size, FILE *disk){
if(!file){
return 1;
file_t root_file = {0};
root_file.start_cluster_high = info->bpb.root_dir_cluster>>16;
root_file.start_cluster_low = info->bpb.root_dir_cluster&0xffff;
file = &root_file;
}
uint32_t first_cluster = file->start_cluster_low | (file->start_cluster_high << 16);
uint32_t clusters = (size / (info->bpb.bytes_per_sector * info->bpb.sectors_per_cluster )) + 1;
@ -163,7 +176,7 @@ int write_file(fat_info *info, file_t *file, buffer_t *buffer, size_t size, FILE
}
int create_file(char *path, fat_info *info, FILE *file){
file_t *file_desc_buffer = calloc(info->bpb.root_dir_entries, sizeof(file_t));
}
int fat_write_back(FILE *file, fat_info *info){