can read and write

src/main.rs

@@ -3,6 +3,6 @@ use csv::table::Table;
 fn main() {
     let csv = include_str!("data/test.csv");
     let table = Table::from_csv(csv, None);
-    println!("{:?}",table);
+    // println!("{:?}",table);
     table.select("*");
 }

src/page.rs

@@ -62,14 +62,14 @@ impl Page {
         self.data.splice(start..self.index_pos as usize, bytes);
     }
 
-    pub fn get(&self, index: usize) -> Option<Record> {
-        if index < self.n_records {
-            let index = BigEndian::read_u16(&self.data[index * 2..=index * 2 + 1]);
-            let (nbytes, len) = varint::read(&self.data[index as usize..]);
+    pub fn get(&self, row_index: usize) -> Option<Record> {
+        if row_index < self.n_records {
+            let physical_index = BigEndian::read_u16(&self.data[row_index * 2..=row_index * 2 + 1]);
+            let (bytes_read, len) = varint::read(&self.data[physical_index as usize..]);
             Some(
                 (
                     len,
-                    &self.data[nbytes + index as usize..nbytes + index as usize + len as usize],
+                    &self.data[bytes_read + physical_index as usize..=bytes_read + physical_index as usize + len as usize],
                 )
                     .into(),
             )

src/record.rs

@@ -88,15 +88,17 @@ impl From<Record> for Vec<u8> {
 // needs improving, for clarity get rid of the tuple
 impl Into<Record> for (u64, &[u8]) {
     fn into(self) -> Record {
-        let (len, data) = self;
-        let len = len as usize; //meh
-        let (mut offset, rowid) = varint::read(data);
-
+        let (_, data) = self;
+        let mut offset = 0;
+        let (inc, rowid) = varint::read(data);
+        offset += inc;
         let mut datatypes = vec![];
-
+        let (inc, dt_len) = varint::read(&data[offset..]);
+        offset += inc;
+        let end_of_dt = offset + dt_len as usize - 1; // why -1?
                                                       //read n of fields
 
-        while offset < len {
+        while offset < end_of_dt {
             //WRONG, read this len first from the buffer
             let (inc, datatype) = varint::read(&data[offset..]);
             datatypes.push(datatype);
@@ -107,27 +109,24 @@ impl Into<Record> for (u64, &[u8]) {
         let mut values: Vec<Value> = vec![];
         for dt in datatypes {
             match dt {
-                13.. if dt % 2 == 0 => {
-                    let len = ((dt >> 1) - 13) as usize;
-                    if let Ok(text) = String::from_utf8(data[offset..len].to_vec()) {
-                        values.push(text.into());
-                    }
+                13.. if dt % 2 == 1 => {
+                    let len = ((dt - 13) >> 1) as usize;
+                    values.push(Value::new(dt, data[offset..offset + len].to_vec()));
                     offset += len;
                 }
                 12.. if dt % 2 == 0 => {
                     let len = ((dt >> 1) - 12) as usize;
-                    // no blobs yet
+                    values.push(Value::new(dt, data[offset..offset + len].to_vec()));
                     offset += len;
                 }
-                9 => values.push(1.into()),
-                8 => values.push(0.into()),
+                8 | 9 => values.push(Value::new(dt, vec![])),
                 7 => {
-                    values.push(BigEndian::read_f64(&data[offset..offset + 8]).into());
+                    values.push(Value::new(dt, data[offset..offset + 8].to_vec()));
                     offset += 8;
                 }
                 1..=6 => {
-                    let (inc, v) = read_int(&data[offset..], dt);
-                    values.push(v.into());
+                    let inc = read_int_len(dt);
+                    values.push(Value::new(dt, data[offset..offset + inc].to_vec()));
                     offset += inc;
                 }
                 0 => {
@@ -141,13 +140,12 @@ impl Into<Record> for (u64, &[u8]) {
     }
 }
 
-fn read_int(buf: &[u8], datatype: u64) -> (usize, i64) {
-    let nb = match datatype {
+fn read_int_len(datatype: u64) -> usize {
+    match datatype {
         6 => 8,
         5 => 6,
         _ => datatype as usize,
-    };
-    (nb, BigEndian::read_i64(&buf[..nb]))
+    }
 }
 
 impl Default for Record {

src/table.rs

@@ -153,7 +153,8 @@ impl Iterator for TableIter {
     type Item = Record;
 
     fn next(&mut self) -> Option<Self::Item> {
-        self.root_page.borrow().get(self.index)
+        self.index += 1;
+        self.root_page.borrow().get(self.index - 1)
     }
 }
 

src/value.rs

@@ -61,7 +61,7 @@ pub enum Datatype {
 }
 
 impl Value {
-    fn new(datatype: u64, data: Vec<u8>) -> Self {
+    pub(crate) fn new(datatype: u64, data: Vec<u8>) -> Self {
         Self {
             datatype,
             data,
@@ -69,6 +69,14 @@ impl Value {
         }
     }
 
+    pub(crate) fn from_raw(datatype_bytes: Vec<u8>, data: Vec<u8>) -> Self {
+        Self{
+            datatype: varint::read(&datatype_bytes).1,
+            datatype_bytes,
+            data,
+        }
+    }
+
     /// get the length of the encoding of the value
     pub fn bytes_len(&self) -> u16 {
         (self.datatype_bytes.len() + self.data.len()) as u16
@@ -188,10 +196,10 @@ impl Into<Value> for &str {
 
 impl Into<Value> for String {
     fn into(self) -> Value {
-        if let Ok(f) = self.parse::<f64>() {
-            Value::from_f64(f)
-        } else if let Ok(i) = self.parse::<i64>() {
+        if let Ok(i) = self.parse::<i64>() {
             Value::from_i64(i)
+        } else if let Ok(f) = self.parse::<f64>() {
+            Value::from_f64(f)
         } else {
             Value::from_text(strip_quotes(self))
         }