ssv_lire_carte_ps2 retourne un CartePS

crates/sesam-vitale/src/main.rs

@@ -1,5 +1,6 @@
 mod ssvlib_demo;
 mod libssv;
+mod ssv_memory;
 
 fn main() {
     ssvlib_demo::demo();

crates/sesam-vitale/src/ssv_memory.rs

@@ -0,0 +1,324 @@
+/**
+ * Provide functions to manipulate raw memory from SSV library.
+ */
+
+// TODO : Est-ce qu'on pourrait/devrait définir un type custom pour représenter les tableaux de bytes ?
+
+use std::convert::TryFrom;
+
+#[derive(PartialEq, Debug)]
+struct ElementSize {
+    pub size: usize,
+    pub pad: usize,
+}
+
+impl TryFrom<&[u8]> for ElementSize {
+    type Error = &'static str;
+
+    fn try_from(bytes: &[u8]) -> Result<Self, Self::Error> {
+            /* Longueur:
+        *   - si le bit de poids fort du premier octet est à 0, la longueur est codée sur un octet
+        *   - si le bit de poids fort du premier octet est à 1, les 7 bits de poids faible codent le nombre d'octets utilisés pour coder la longueur
+        */
+        if bytes.len() == 0 {
+            return Err("Empty bytes input");
+        }
+
+        let mut element_size = ElementSize { size: 0, pad: 1 };
+        if bytes[0] & 0b1000_0000 == 0 {
+            // Size coded on 1 byte
+            element_size.size = bytes[0] as usize;
+        } else {
+            // Size coded on N bytes
+            // N are the 7 lower bits of the first byte
+            let size_bytes_len = (bytes[0] & 0b0111_1111) as usize;
+            if size_bytes_len > bytes.len() - 1 {
+                return Err("Invalid memory: not enough bytes to read the size");
+            } else if size_bytes_len > 4 {
+                return Err("Invalid memory: size is too big");
+            }
+            let size_bytes = &bytes[1..1 + size_bytes_len];
+
+            // u32::from_be_bytes() requires a 4 bytes array
+            let mut padded_bytes = [0u8; 4];
+            padded_bytes[size_bytes_len..].copy_from_slice(&size_bytes);
+
+            element_size.size = u32::from_be_bytes(padded_bytes) as usize;
+            element_size.pad += size_bytes_len;
+        }
+        Ok(element_size)
+    }
+}
+
+#[derive(Debug)]
+pub struct Block<'a> {
+    pub id: u16,
+    pub size: usize,
+    pub content: Vec<Field<'a>>,
+}
+
+impl<'a> From<&'a [u8]> for Block<'a> {
+    fn from(bytes: &'a [u8]) -> Self {
+        let mut offset = 0;
+        let id = u16::from_be_bytes(bytes[..2].try_into().unwrap());
+        offset += 2;
+        let ElementSize { size: block_size, pad } = bytes[2..].try_into().unwrap();
+        offset += pad;
+        let raw_content = &bytes[offset..];
+        let mut field_offset = 0;
+        // While there is still content to read, parse Fields
+        let mut content = Vec::new();
+        while field_offset < block_size {
+            let field: Field<'a> = raw_content[field_offset..].into();
+            field_offset += field.size;
+            content.push(field);
+        }
+        Block {
+            id,
+            size: offset + block_size,
+            content,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Field<'a> {
+    pub size: usize,
+    pub content: &'a [u8],
+}
+
+impl<'a> From<&'a [u8]> for Field<'a> {
+    fn from(bytes: &'a [u8]) -> Self {
+        let ElementSize { size, pad } = bytes.try_into().unwrap();
+        let contenu = &bytes[pad..pad+size];
+        Field {
+            size: pad+size,
+            content: contenu,
+        }
+    }
+}
+
+pub fn decode_ssv_memory(bytes: &[u8], size: usize) -> Vec<Block> {
+    let mut blocks: Vec<Block> = Vec::new();
+    let mut offset = 0;
+    while offset < size {
+        let block: Block = bytes[offset..].into();
+        offset += block.size;
+        blocks.push(block);
+    }
+    blocks
+}
+
+#[cfg(test)]
+mod test_element_size {
+    use super::*;
+
+    #[test]
+    fn short_size() {
+        let bytes: &[u8] = &[0b_0000_0001_u8];
+        let element_size: ElementSize = bytes.try_into().unwrap();
+        assert_eq!(element_size.size, 1);
+        assert_eq!(element_size.pad, 1);
+
+        let bytes: &[u8] = &[0b_0100_0000_u8];
+        let element_size: ElementSize = bytes.try_into().unwrap();
+        assert_eq!(element_size.size, 64);
+        assert_eq!(element_size.pad, 1);
+    }
+
+    #[test]
+    fn long_size() {
+        let bytes: &[u8] = &[0b_1000_0010_u8, 0b_0000_0001_u8, 0b_0100_0000_u8];
+        let element_size: ElementSize = bytes.try_into().unwrap();
+        assert_eq!(element_size.size, 320);
+        assert_eq!(element_size.pad, 3);
+    }
+
+    #[test]
+    fn null_size() {
+        let bytes: &[u8] = &[];
+        let result: Result<ElementSize, &str> = bytes.try_into();
+        assert_eq!(
+            result,
+            Err("Empty bytes input"),
+        );
+    }
+
+    #[test]
+    fn invalid_memory() {
+        let bytes: &[u8] = &[0b_1000_0001_u8];
+        let result: Result<ElementSize, &str> = bytes.try_into();
+        assert_eq!(
+            result,
+            Err("Invalid memory: not enough bytes to read the size"),
+        );
+
+        let bytes: &[u8] = &[0b_1000_0010_u8, 1];
+        let result: Result<ElementSize, &str> = bytes.try_into();
+        assert_eq!(
+            result,
+            Err("Invalid memory: not enough bytes to read the size"),
+        );
+
+        let bytes: &[u8] = &[0b_1000_0101_u8, 1, 1, 1, 1, 1];
+        let result: Result<ElementSize, &str> = bytes.try_into();
+        assert_eq!(
+            result,
+            Err("Invalid memory: size is too big"),
+        );
+    }
+}
+
+#[cfg(test)]
+mod test_field {
+    use super::*;
+
+    #[test]
+    fn short_size() {
+        let bytes: &[u8] = &[51,
+            1, 48, 1, 56, 11, 57, 57, 55, 48, 48,
+            53, 50, 52, 49, 57, 52, 1, 52, 2, 50,
+            50, 17, 80, 72, 65, 82, 77, 65, 67, 73,
+            69, 78, 48, 48, 53, 50, 52, 49, 57, 9,
+            70, 82, 65, 78, 67, 79, 73, 83, 69, 1,
+            84,
+        ];
+        let element: Field = bytes.try_into().unwrap();
+        assert_eq!(element.size, 52);
+        assert_eq!(element.content[..5], [1, 48, 1, 56, 11]);
+    }
+
+    #[test]
+    fn long_size() {
+        let mut bytes_vec = vec![0b_1000_0010_u8,
+            0b_0000_0001_u8, 0b_0000_0000_u8, // size = 256
+        ];
+        // Add 256 bytes to the content
+        bytes_vec.append(&mut vec![1; 256]);
+        let bytes: &[u8] = &bytes_vec;
+        let element: Field = bytes.try_into().unwrap();
+        assert_eq!(element.size, 259);
+        assert_eq!(element.content.len(), 256);
+    }
+}
+
+#[cfg(test)]
+mod test_block {
+    use super::*;
+
+    #[test]
+    fn test_francoise_pharmacien0052419_partial_block_1() {
+        let bytes: &[u8] = &[
+            1, 48,
+            1, 56,
+            11, 57, 57, 55, 48, 48, 53, 50, 52, 49, 57, 52,
+        ];
+        
+        let field1: Field = bytes.into();
+        assert_eq!(field1.size, 2);
+        assert_eq!(field1.content, &[48]);
+
+        let field2: Field = bytes[field1.size..].into();
+        assert_eq!(field2.size, 2);
+        assert_eq!(field2.content, &[56]);
+
+        let field3: Field = bytes[field1.size + field2.size..].into();
+        assert_eq!(field3.size, 12);
+        assert_eq!(field3.content, &[57, 57, 55, 48, 48, 53, 50, 52, 49, 57, 52]);
+    }
+
+    #[test]
+    fn test_francoise_pharmacien0052419() {
+        let bytes: &[u8] = &[
+        0, 1, 51, // 3
+            1, 48, // 2
+            1, 56, // 2
+            11, 57, 57, 55, 48, 48, 53, 50, 52, 49, 57, 52, // 12
+            1, 52, // 2
+            2, 50, 50, // 3
+            17, 80, 72, 65, 82, 77, 65, 67, 73, 69, 78, 48, 48, 53, 50, 52, 49, 57, // 18
+            9, 70, 82, 65, 78, 67, 79, 73, 83, 69, // 10
+            1, 84, // 2
+        // total: 54
+            
+        0, 2, 83,
+            1, 1,
+            1, 48,
+            1, 49,
+            2, 56, 54,
+            1, 49,
+            9, 48, 66, 48, 50, 50, 49, 57, 53, 56,
+            1, 56,
+            24, 80, 72, 65, 82, 77, 65, 67, 73, 69, 32, 68, 85, 32, 67, 69, 78, 84, 82, 69, 50, 50, 49, 57, 53,
+            8, 48, 48, 50, 48, 50, 52, 49, 57,
+            1, 56,
+            0,
+            1, 48,
+            1, 49,
+            2, 53, 48,
+            2, 49, 48,
+            2, 48, 48,
+            1, 48,
+            1, 48,
+            1, 48,
+            1, 49,
+            1, 49,
+        ];
+        
+        let first_block: Block = bytes.into();
+        assert_eq!(first_block.id, 1);
+        assert_eq!(first_block.size, 54);
+        assert_eq!(first_block.content.len(), 8);
+
+        let second_block: Block = bytes[first_block.size..].into();
+        assert_eq!(second_block.id, 2);
+        assert_eq!(second_block.size, 86);
+        assert_eq!(second_block.content.len(), 21);
+    }
+}
+
+#[cfg(test)]
+mod test_decode_ssv_memory {
+    use super::*;
+
+    #[test]
+    fn test_francoise_pharmacien0052419() {
+        let bytes: &[u8] = &[
+        0, 1, 51, // 3
+            1, 48, // 2
+            1, 56, // 2
+            11, 57, 57, 55, 48, 48, 53, 50, 52, 49, 57, 52, // 12
+            1, 52, // 2
+            2, 50, 50, // 3
+            17, 80, 72, 65, 82, 77, 65, 67, 73, 69, 78, 48, 48, 53, 50, 52, 49, 57, // 18
+            9, 70, 82, 65, 78, 67, 79, 73, 83, 69, // 10
+            1, 84, // 2
+        // total: 54
+            
+        0, 2, 83,
+            1, 1,
+            1, 48,
+            1, 49,
+            2, 56, 54,
+            1, 49,
+            9, 48, 66, 48, 50, 50, 49, 57, 53, 56,
+            1, 56,
+            24, 80, 72, 65, 82, 77, 65, 67, 73, 69, 32, 68, 85, 32, 67, 69, 78, 84, 82, 69, 50, 50, 49, 57, 53,
+            8, 48, 48, 50, 48, 50, 52, 49, 57,
+            1, 56,
+            0,
+            1, 48,
+            1, 49,
+            2, 53, 48,
+            2, 49, 48,
+            2, 48, 48,
+            1, 48,
+            1, 48,
+            1, 48,
+            1, 49,
+            1, 49,
+        ];
+        let blocks = decode_ssv_memory(&bytes, bytes.len());
+        assert_eq!(blocks.len(), 2);
+    }
+}