diff options
Diffstat (limited to 'Source/Kernel')
| -rw-r--r-- | Source/Kernel/Core/Sys.ns.cpp | 2 | ||||
| -rw-r--r-- | Source/Kernel/FileSystems/FAT/FATFS.class.cpp | 28 |
2 files changed, 27 insertions, 3 deletions
diff --git a/Source/Kernel/Core/Sys.ns.cpp b/Source/Kernel/Core/Sys.ns.cpp index eeb92ee..49b2725 100644 --- a/Source/Kernel/Core/Sys.ns.cpp +++ b/Source/Kernel/Core/Sys.ns.cpp @@ -83,7 +83,7 @@ void dumpRegs(registers_t *regs, VirtualTerminal& vt) { void stackTrace(u32int ebp, VirtualTerminal& vt, u32int maxframes) { u32int *stack = (u32int*)ebp; - for (u32int i = 0; i < maxframes and (u32int)stack > 0xC0000000; i++) { + for (u32int i = 0; i < maxframes and (u32int)stack > 0xC0000000 and (u32int)stack < (ebp + 0x10000); i++) { vt << "Frame: " << (u32int)stack << " n:" << stack[0] << " r:" << stack[1] << "\n"; stack = (u32int*)stack[0]; } diff --git a/Source/Kernel/FileSystems/FAT/FATFS.class.cpp b/Source/Kernel/FileSystems/FAT/FATFS.class.cpp index 2590785..00107e5 100644 --- a/Source/Kernel/FileSystems/FAT/FATFS.class.cpp +++ b/Source/Kernel/FileSystems/FAT/FATFS.class.cpp @@ -50,7 +50,8 @@ FATFS* FATFS::mount(Partition* p, DirectoryNode* mountpoint) { *kvt << "\nDetected a FAT" << (s64int)fs->m_fatType << " filesystem.\n" << "root_dir_sectors:" << fs->m_rootDirSectors << " fat_size:" << fs->m_fatSize << " total_sectors:" << fs->m_totalSectors << " data_sectors:" << dataSectors << " count_of_clusters:" << fs->m_countOfClusters << - " sizeof(fat_dir_entry_t):" << sizeof(fat_dir_entry_t) << " first_data_sector:" << fs->m_firstDataSector; + " sizeof(fat_dir_entry_t):" << sizeof(fat_dir_entry_t) << " first_data_sector:" << fs->m_firstDataSector << + " cluster_size:" << fs->m_clusterSize; return 0; } @@ -122,7 +123,30 @@ bool FATFS::setParent(FSNode* node, FSNode* parent) { } u32int FATFS::read(FileNode* file, u64int position, u32int max_length, u8int *data) { - return 0; + u32int len = max_length; + if (position >= file->getLength()) return 0; + if (position + len > file->getLength()) len = len - position; + u32int firstCluster = position / m_clusterSize, clusterOffset = position % m_clusterSize; + u32int clusters = (len + clusterOffset) / m_clusterSize + 1, lastClusBytesToRead = (len + clusterOffset) % m_clusterSize; + u32int clust = FIRSTCLUS(file); + //Find first cluster + for (u32int i = 0; i < firstCluster and clust != 0; i++) clust = nextCluster(clust); + if (clust == 0) return 0; + //Read first cluster + u8int* temp = (u8int*)Mem::alloc(m_clusterSize); + readCluster(clust, temp); + memcpy(data, temp + clusterOffset, (m_clusterSize - clusterOffset)); + //Read next clusters + u32int pos = (m_clusterSize - clusterOffset); + for (u32int i = 1; i < clusters; i++) { + clust = nextCluster(clust); + if (clust == 0) break; + readCluster(clust, temp); + memcpy(data + pos, temp, (i == clusters - 1 ? lastClusBytesToRead : m_clusterSize)); + pos += m_clusterSize; + } + Mem::free(temp); + return len; } bool FATFS::write(FileNode* file, u64int position, u32int length, u8int* data) { |