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Read out very long file, but not very long name

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This commit is contained in:
Byron Lathi
2023-12-05 08:29:44 -08:00
parent 13738fc0d8
commit 9ae1593957
4 changed files with 59 additions and 3 deletions
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33
sw/fsdir/verylargetextwithverylongname.txt Normal file
View File

@@ -0,0 +1,33 @@
very large text file with a very long name
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
12345678901234567890123456789012345678901234567890123456789012345678901234567890
ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ
ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
~!@#$%^&*()_+`1234567890-=[]\{}|;':",./<>?~!@#$%^&*()_+`1234567890-=[]\{}|;':",./<>?~!@#$%^&*()_+`1234567890-=[]\{}|;':",./<>?~!@#$%^&*()_+`1234567890-=[]\{}|;':",./<>?~!@#$%^&*()_+`1234567890-=[]\{}|;':",./<>?~!@#$%^&*()_+`1234567890-=[]\{}|;':",./<>?~!@#$%^&*()_+`1234567890-=[]\{}|;':",./<>?~!@#$%^&*()_+`1234567890-=[]\{}|;':",./<>?

1
sw/kernel/filesystems/fat32.h
View File

@@ -41,5 +41,6 @@ struct lfn_entry {
int8_t fat32_get_cluster_by_name(char* name, struct fat32_directory_entry* dentry); int8_t fat32_get_cluster_by_name(char* name, struct fat32_directory_entry* dentry);
int8_t fat32_read_cluster(uint32_t cluster, void* buf); int8_t fat32_read_cluster(uint32_t cluster, void* buf);
uint32_t fat32_next_cluster(uint32_t cluster);
#endif #endif

13
sw/kernel/filesystems/fat32_c.c
View File

@@ -12,10 +12,23 @@ int8_t fat32_read_cluster(uint32_t cluster, void* buf) {
return error; return error;
} }
uint32_t fat32_next_cluster(uint32_t cluster) {
uint8_t error;
uint32_t addr = fat_start_sector;
uint32_t cluster_val;
SD_readSingleBlock(addr, sd_buf, &error);
cluster_val = ((uint32_t*)sd_buf)[cluster];
return cluster_val;
}
int8_t fat32_get_cluster_by_name(char* name, struct fat32_directory_entry* dentry) { int8_t fat32_get_cluster_by_name(char* name, struct fat32_directory_entry* dentry) {
struct fat32_directory_entry* local_entry; struct fat32_directory_entry* local_entry;
int i = 0; int i = 0;
uint32_t cluster;
cluster = fat32_next_cluster(root_cluster);
cprintf("Sectors per cluster: %hhx\n", sectors_per_cluster); cprintf("Sectors per cluster: %hhx\n", sectors_per_cluster);
fat32_read_cluster(root_cluster, sd_buf); fat32_read_cluster(root_cluster, sd_buf);

15
sw/test_code/fs_test/main.c
View File

@@ -9,10 +9,11 @@ int main(void) {
int i; int i;
uint32_t offset = 0; uint32_t offset = 0;
uint32_t cluster; uint32_t cluster;
uint8_t cluster_count;
fat32_init(); fat32_init();
/* This is what is going to be part of open */ /* This is what is going to be part of open */
fat32_get_cluster_by_name("TEST TXT", &dentry); fat32_get_cluster_by_name("VERYLA~1TXT", &dentry);
cprintf("attr1: %x\n", dentry.attr1); cprintf("attr1: %x\n", dentry.attr1);
cprintf("cluster: %x%x\n", dentry.cluster_high, dentry.cluster_low); cprintf("cluster: %x%x\n", dentry.cluster_high, dentry.cluster_low);
cprintf("File Size: %lx\n", dentry.file_size); cprintf("File Size: %lx\n", dentry.file_size);
@@ -20,10 +21,18 @@ int main(void) {
/* This will become part of read */ /* This will become part of read */
cluster = (dentry.cluster_high << 16) | dentry.cluster_low; cluster = (dentry.cluster_high << 16) | dentry.cluster_low;
cluster++;
fat32_read_cluster(cluster + offset/512, sd_buf); fat32_read_cluster(cluster + offset/512, sd_buf);
for (i = 0; i < dentry.file_size; i++) { cluster_count = (dentry.file_size/512)/sectors_per_cluster;
cprintf("%c", sd_buf[i]); cprintf("Cluster count: %x\n", cluster_count);
while (cluster < 0xffffff0) {
for (i = 0; i < dentry.file_size && i < 512; i++) {
cprintf("%c", sd_buf[i]);
}
cluster = fat32_next_cluster(cluster);
fat32_read_cluster(cluster + offset/512, sd_buf);
} }
return 0; return 0;