Added file reading without cluster chain following

CoreLib/Makefile

@@ -5,7 +5,7 @@ BUILD_DIR = ../build/CoreLib
 OBJ_FOLDER = ../bin/CoreLib
 OUTPUTFILE = $(BUILD_DIR)/libCoreLib.a
 
-OFILES = $(OBJ_FOLDER)/memory.o $(OBJ_FOLDER)/path.o $(OBJ_FOLDER)/stack.o $(OBJ_FOLDER)/string.o $(OBJ_FOLDER)/stringview.o
+OFILES = $(OBJ_FOLDER)/ctype.o $(OBJ_FOLDER)/memory.o $(OBJ_FOLDER)/path.o $(OBJ_FOLDER)/stack.o $(OBJ_FOLDER)/string.o $(OBJ_FOLDER)/stringview.o
 
 .phony: all
 all: $(OUTPUTFILE)
@@ -15,6 +15,11 @@ $(OUTPUTFILE): $(OFILES)
 	pwd
 	ar -rc $(OUTPUTFILE) $(OFILES)
 
+
+
+$(OBJ_FOLDER)/ctype.o: ctype.cpp
+	$(CPP) -c ctype.cpp -o $(OBJ_FOLDER)/ctype.o $(CFLAGS)
+
 $(OBJ_FOLDER)/memory.o: Memory.cpp
 	$(CPP) -c Memory.cpp -o $(OBJ_FOLDER)/memory.o $(CFLAGS)
 

CoreLib/ctype.cpp

@@ -0,0 +1,141 @@
+//
+// Created by nigel on 25/02/23.
+//
+#include "ctype.h"
+
+int isupper (int ch){
+    if( ch >= 'A' && ch <= 'Z'){
+        return 1;
+    }
+    return 0;
+}
+int islower (int ch){
+    if(ch >= 'a' && ch <= 'z'){
+        return 1;
+    }
+    return 0;
+}
+
+int isalpha (int ch) {
+    if(isupper(ch)){
+        return 1;
+    }
+    if(islower(ch)){
+        return 1;
+    }
+    return 0;
+}
+int isdigit (int ch){
+    if(ch >= '0' && ch <= '9'){
+        return 1;
+    }
+    return 0;
+}
+
+int isxdigit (int ch){
+    if(isdigit(ch)){
+        return 1;
+    }
+
+    if( ch >= 'a' && ch <= 'f'){
+        return 1;
+    }
+
+    if( ch >= 'A' && ch <= 'F'){
+        return 1;
+    }
+    return 0;
+}
+
+int iscntrl (int ch){
+    if(ch >= 0x00 && ch <= 0x1f )
+        return 1;
+    if(ch == 0x7f)
+        return 1;
+    return 0;
+}
+
+
+int isgraph (int ch){
+    if(isdigit(ch))
+        return 1;
+    if(isupper(ch))
+        return 1;
+    if(islower(ch))
+        return 1;
+    if(ispunct(ch))
+        return 1;
+    return 0;
+}
+
+int isspace(int ch){
+    if (ch == 0x20)
+        return 1;
+    if(ch == 0x0c)
+        return 1;
+    if(ch == 0x0a)
+        return 1;
+    if(ch == 0x0d)
+        return 1;
+    if(ch == 0x09)
+        return 1;
+    if(ch == 0x0b)
+        return 1;
+
+    return 0;
+}
+
+int isblank (int ch){
+    if( ch == 0x20 || ch == 0x09)
+        return 1;
+    return 0;
+}
+
+int ispunct(int ch){
+    if(ch >= '!' && ch <= '~')
+        return 1;
+    return 0;
+}
+
+int isprint (int ch){
+    if (isdigit(ch))
+        return 1;
+    if(isupper(ch))
+        return 1;
+    if(islower(ch))
+        return 1;
+    if(ispunct(ch))
+        return 1;
+    if(isspace(ch))
+        return 1;
+
+}
+
+
+int tolower(int ch){
+
+    if(islower(ch)) return ch;
+    int diff = 'a' - 'A';
+    return ch + diff;
+}
+
+int toupper(int ch){
+    if(isupper(ch)) return ch;
+    int diff = 'a' - 'A';
+    return ch - diff;
+}
+
+
+
+int isalnum (int ch){
+    if(isdigit(ch)){
+        return 1;
+    }
+
+   if(isalpha(ch)){
+       return 1;
+   }
+
+    return 0;
+
+}

CoreLib/ctype.h

@@ -0,0 +1,21 @@
+//
+// Created by nigel on 25/02/23.
+//
+#pragma once
+
+//NOTE: Uses default locale
+int isupper (int ch);
+int islower (int ch);
+int isalpha (int ch);
+int isdigit (int ch);
+int isxdigit (int ch);
+int iscntrl (int ch);
+int isgraph(int ch);
+int isspace(int ch);
+int isblank(int ch);
+int ispunct(int ch);
+int isprint(int ch);
+int isalnum (int ch);
+int tolower(int ch);
+int toupper(int ch);
+

kernel/kernel.cpp

@@ -122,6 +122,8 @@ extern "C" void kernel ()
         printf(" [Size: %d bytes, Attributes: %d]\n", entry->ATTR, entry->FileSize);
         if(entry->ATTR & FAT::ATTRIBUTES::ATTR_DIRECTORY ){
             FAT::OpenSubdir(entry, bpb);
+        } else {
+            FAT::readFile(entry, bpb);
         }
 
     }

kernel/storage/filesystems/FAT/FAT.cpp

@@ -146,8 +146,6 @@ uint16_t FAT::GetFATEntry (BiosParameterBlock* bpb, unsigned int cluster){
 
 }
 
-
-
 uint16_t FAT::DetermineFreeSpace()
 {
     // Loop through all FAT entries in all FAT's
@@ -180,8 +178,6 @@ unsigned int FAT::RootDirSize(BiosParameterBlock* bpb)
 
 }
 
-
-
 uint16_t* ReadFAT (BiosParameterBlock& bpb ,  bool DEBUG = false ) {
     uint32_t FATAddress = /*StartAddress*/ 0x00 +  bpb.RsvdSecCnt ;
     uint16_t* FAT = (uint16_t*)malloc(sizeof (uint16_t) * 256);
@@ -253,42 +249,29 @@ void FAT::OpenSubdir(DIR* directory, BiosParameterBlock* bpb ){
             printf("LFN\n");
         }
 
-
-
-
-
-
-
-
     }
 
-
-
 }
 
+void FAT::readFile(DIR* fileEntry , BiosParameterBlock* bpb){
+    unsigned int cluster = fileEntry->FstClusLo;
+    unsigned int FATEntry = FAT::GetFATEntry(bpb, cluster);
+    unsigned int root_dir_sectors = FAT::RootDirSize(bpb);
+    unsigned int fat_size = bpb->FATSz16;
+    unsigned int first_data_sector = bpb->RsvdSecCnt + (bpb->NumFATs * fat_size) + root_dir_sectors;
+    unsigned int file_data_sector = ((cluster -2) * bpb->SecPerClus) + first_data_sector;
+    printf("FAT entry = %x\n", FATEntry);
+    uint16_t data[256];
+    ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, file_data_sector, data);
 
-void readFile(uint32_t DataRegion, DIR* entry, uint16_t FATentry, BiosParameterBlock& bpb ){
+    for (unsigned short n : data)
-    printf("Show contents");
+    {
-
-    printf("Start cluster of the file: 0x%x\n", entry->FileSize);
-
-    printf("IS it only 1 cluster? %s\n", FATentry == 0xFFFF ? "Yes" : "No");
-
-    uint32_t sector = DataRegion + ((entry->FileSize - 0x02) * bpb.SecPerClus);
-
-
-    uint16_t dataBlob[256];
-    ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, sector, dataBlob);
-    for (unsigned short n: dataBlob) {
         kterm_put(n & 0x00ff);
-
         kterm_put(n >> 8);
     }
-    kterm_put('\n');
+
 }
 
-
-
 /*
 file fsysFatDirectory (const char* DirectoryName){
     file file;

kernel/storage/filesystems/FAT/FAT.h

@@ -83,6 +83,7 @@ public:
     static int GetSectorOfRootDirectory(BiosParameterBlock*);
     static unsigned int RootDirSize(BiosParameterBlock*);
     static void OpenSubdir (DIR*, BiosParameterBlock*);
+    static void readFile(DIR*, BiosParameterBlock*);