125 lines
2.8 KiB
C++
125 lines
2.8 KiB
C++
/*
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* \brief FFAT file-system directory node
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* \author Christian Prochaska
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* \date 2012-07-04
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*/
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#ifndef _DIRECTORY_H_
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#define _DIRECTORY_H_
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/* ffat includes */
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namespace Ffat { extern "C" {
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#include <ffat/ff.h>
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} }
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/* local includes */
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#include <node.h>
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namespace File_system {
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using namespace Genode;
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class Directory : public Node
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{
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private:
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Ffat::DIR _ffat_dir;
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int64_t _prev_index;
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public:
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Directory(const char *name)
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: Node(name),
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_prev_index(-1) { }
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void ffat_dir(Ffat::DIR ffat_dir) { _ffat_dir = ffat_dir; }
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Ffat::DIR *ffat_dir() { return &_ffat_dir; }
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size_t read(char *dst, size_t len, seek_off_t seek_offset)
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{
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bool verbose = false;
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if (verbose)
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PDBG("len = %zu, seek_offset = %llu", len, seek_offset);
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if (len < sizeof(Directory_entry)) {
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PERR("read buffer too small for directory entry");
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return 0;
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}
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if (seek_offset % sizeof(Directory_entry)) {
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PERR("seek offset not alighed to sizeof(Directory_entry)");
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return 0;
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}
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Directory_entry *e = (Directory_entry *)(dst);
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using namespace Ffat;
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FILINFO ffat_file_info;
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ffat_file_info.lfname = e->name;
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ffat_file_info.lfsize = sizeof(e->name);
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int64_t index = seek_offset / sizeof(Directory_entry);
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if (index != (_prev_index + 1)) {
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/* rewind and iterate from the beginning */
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f_readdir(&_ffat_dir, 0);
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for (int i = 0; i < index; i++)
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f_readdir(&_ffat_dir, &ffat_file_info);
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}
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_prev_index = index;
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FRESULT res = f_readdir(&_ffat_dir, &ffat_file_info);
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switch(res) {
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case FR_OK:
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break;
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case FR_INVALID_OBJECT:
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PERR("f_readdir() failed with error code FR_INVALID_OBJECT");
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return 0;
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case FR_DISK_ERR:
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PERR("f_readdir() failed with error code FR_DISK_ERR");
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return 0;
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case FR_INT_ERR:
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PERR("f_readdir() failed with error code FR_INT_ERR");
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return 0;
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case FR_NOT_READY:
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PERR("f_readdir() failed with error code FR_NOT_READY");
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return 0;
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default:
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/* not supposed to occur according to the libffat documentation */
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PERR("f_readdir() returned an unexpected error code");
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return 0;
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}
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if (ffat_file_info.fname[0] == 0) { /* no (more) entries */
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return 0;
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}
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if (e->name[0] == 0) /* use short file name */
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strncpy(e->name, ffat_file_info.fname, sizeof(e->name));
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if (verbose)
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PDBG("found dir entry: %s", e->name);
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if ((ffat_file_info.fattrib & AM_DIR) == AM_DIR)
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e->type = Directory_entry::TYPE_DIRECTORY;
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else
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e->type = Directory_entry::TYPE_FILE;
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return sizeof(Directory_entry);
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}
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size_t write(char const *src, size_t len, seek_off_t)
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{
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/* writing to directory nodes is not supported */
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return 0;
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}
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};
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}
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#endif /* _DIRECTORY_H_ */
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