Espresso 0.0.1b
This commit is contained in:
206
drivers/fs/vfs.c
206
drivers/fs/vfs.c
@ -1,8 +1,8 @@
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#include <fs/ramfs.h>
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/*#include <fs/fat16.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fs/vfs.h>
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#include <fs/vfs.h>*/
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/*
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@ -11,7 +11,7 @@
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-33 means stdout (which can be read)
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*/
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bool vfs_initialized = false;
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/*bool vfs_initialized = false;
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ramfs_file_header_t* vfs_current_dir = NULL;
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void vfs_init(void)
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@ -27,204 +27,4 @@ void vfs_init(void)
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}
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}
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/* ramfs_file_header_t* ramfs_create_file(char* name, char type, char encryption, ramfs_file_header_t* parent); */
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FILE create_file(char* filename, char type, char encryption, FILE parent)
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{
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if (!filename)
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{
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return -1;
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}
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if (parent == -128)
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{
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parent = vfs_current_dir->fd;
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}
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ramfs_file_header_t* file = ramfs_create_file(filename, type, encryption, ramfs_resolve_fd(parent));
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if (!file)
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{
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return -4; /* error code for failed creation */
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}
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return file->fd;
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}
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int32_t delete_file(FILE file)
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{
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/*
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XXX WARNING: ANY AND ALL PROCESSES CAN DELETE A FILE VIA THIS INTERFACE!!! XXX
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XXX THIS MUST BE PACHED SOON!!! OR AT LEAST ADD PERMISSION CHECKING IN THE SYSCALL INTERFACE XXX
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XXX OR IN THE C LIBRARIES!!! XXX
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*/
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if (file < 1)
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{
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return -4;
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}
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ramfs_file_header_t* _file = ramfs_resolve_fd_dir(vfs_current_dir, file);
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return ramfs_delete_file(_file);
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}
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/*
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Open a file based on a string.
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Return a file descriptor on success, a negative value on failure.
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return values:
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(positive non-zero value) - File descriptor
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-1 - Insufficient permissions to open file
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-2 - File does not exist ( or at least, File not found. )
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-3 - No filesystem is initialized
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-4 - Internal error, perhaps try again
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*/
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FILE open_file(char* filename)
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{
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if (ramfs_get_initialized() && vfs_initialized)
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{
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ramfs_file_header_t* _file = ramfs_resolve_path(filename);
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if (!_file)
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{
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return (FILE)-2;
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}
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return (FILE)_file->fd;
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}
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return (FILE)-3;
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}
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FILE write_file(FILE file, void* data, size_t len)
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{
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if (file < 1 || !data || len == 0)
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{
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return file;
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}
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if (ramfs_get_initialized() && vfs_initialized)
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{
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ramfs_file_header_t* _file = ramfs_resolve_fd_dir(vfs_current_dir, file);
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if (!_file)
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{
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return -4;
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}
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if (_file->type == RAMFS_FILE_DIR)
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{
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return -1;
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}
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if (_file->data_begin)
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{
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free(_file->data_begin);
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_file->data_begin = NULL;
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_file->data_end = NULL;
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}
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void* new_buf = malloc(len);
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if (!new_buf)
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{
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return -2;
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}
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memcpy(new_buf, data, len);
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_file->data_begin = new_buf;
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_file->data_end = (void*)((uint8_t*)new_buf + len);
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return file;
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}
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return -3;
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}
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int32_t read_file(FILE file, void* buf, size_t buflen)
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{
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if (file < 1 || !buf || buflen == 0)
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{
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return -1; /* Invalid arguments */
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}
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if (ramfs_get_initialized() && vfs_initialized)
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{
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ramfs_file_header_t* _file = ramfs_resolve_fd_dir(vfs_current_dir, file);
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if (!_file || _file->type == RAMFS_FILE_DIR)
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{
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return -2; /* Not a file or trying to read a directory */
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}
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if (!_file->data_begin || !_file->data_end)
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{
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return 0; /* Empty file */
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}
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size_t total_len = (size_t)((uint8_t*)_file->data_end - (uint8_t*)_file->data_begin);
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if (_file->read_offset >= (int32_t)total_len)
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{
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return 0; /* End of file */
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}
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size_t available = total_len - _file->read_offset;
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size_t to_copy = (buflen < available) ? buflen : available;
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memcpy(buf, (uint8_t*)_file->data_begin + _file->read_offset, to_copy);
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_file->read_offset += to_copy;
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return (int32_t)to_copy;
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}
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return -3; /* FS not initialized */
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}
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int32_t reset_read_offset(FILE file)
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{
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if (file < 1)
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{
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return -1;
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}
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ramfs_file_header_t* _file = ramfs_resolve_fd_dir(vfs_current_dir, file);
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if (!_file)
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{
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return -2;
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}
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_file->read_offset = 0;
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return 0;
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}
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int32_t seek_file(FILE file, int32_t offset)
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{
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if (file < 0 && file != -32 && file != -33)
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{
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return -1; /* Invalid file descriptor */
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}
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ramfs_file_header_t* _file = ramfs_resolve_fd_dir(vfs_current_dir, file);
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if (!_file || _file->type == RAMFS_FILE_DIR)
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return -2; // Invalid file or directory
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if (!_file->data_begin || !_file->data_end)
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return -3; // Empty file
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size_t file_size = (size_t)((uint8_t*)_file->data_end - (uint8_t*)_file->data_begin);
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if (offset < 0 || (size_t)offset > file_size)
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return -4; // Offset out of bounds
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_file->read_offset = offset;
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return 0; // Success
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}
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