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use std::fs::File;
use std::io::{self, Read, Seek, SeekFrom};
use std::path::Path;
#[derive(Debug)]
pub enum SqliteError {
Io(io::Error),
InvalidFormat,
InvalidPageType(u8),
TableNotFound(String),
UnsupportedFeature(String),
}
impl From<io::Error> for SqliteError {
fn from(e: io::Error) -> Self {
Self::Io(e)
}
}
pub struct SqliteReader {
file: File,
page_size: u32,
}
#[derive(Debug, Clone)]
pub struct SqliteValue {
pub data: Vec<u8>,
pub data_type: SqliteType,
}
impl SqliteValue {
pub fn as_string(&self) -> Option<String> {
String::from_utf8(self.data.clone()).ok()
}
}
#[derive(Debug, Clone, PartialEq)]
pub enum SqliteType {
Null,
Integer,
Float,
Text,
Blob,
}
impl SqliteReader {
pub fn open<P: AsRef<Path>>(path: P) -> Result<Self, SqliteError> {
let mut file = File::open(path)?;
// Read header (100 bytes)
let mut header = [0u8; 100];
if file.read(&mut header)? != 100 {
return Err(SqliteError::InvalidFormat);
}
// Check magic
if &header[0..16] != b"SQLite format 3\0" {
return Err(SqliteError::InvalidFormat);
}
// Page size at offset 16 (BE)
let page_size_be = u16::from_be_bytes([header[16], header[17]]);
let page_size = if page_size_be == 1 {
65536
} else {
page_size_be as u32
};
Ok(Self { file, page_size })
}
/// Read a generic page
fn read_page(&mut self, page_id: u32) -> Result<Vec<u8>, SqliteError> {
let offset = (page_id as u64 - 1) * self.page_size as u64;
self.file.seek(SeekFrom::Start(offset))?;
let mut buf = vec![0u8; self.page_size as usize];
self.file.read_exact(&mut buf)?;
Ok(buf)
}
/// Read a varint (1-9 bytes)
fn read_varint(data: &[u8], pos: &mut usize) -> u64 {
let mut result = 0u64;
for _i in 0..8 {
if *pos >= data.len() {
return result;
}
let byte = data[*pos];
*pos += 1;
result = (result << 7) | ((byte & 0x7F) as u64);
if (byte & 0x80) == 0 {
return result;
}
}
// 9th byte uses all 8 bits
if *pos < data.len() {
let byte = data[*pos];
*pos += 1;
result = (result << 8) | (byte as u64);
}
result
}
/// Parse a record from cell content
fn parse_record(data: &[u8]) -> Result<Vec<SqliteValue>, SqliteError> {
let mut pos = 0;
let _header_len = Self::read_varint(data, &mut pos);
// Read serial types until we reach the end of header
// Wait, header_len includes the size varint itself.
// Let's verify: "The header begins with a single varint which determines the total number of bytes in the header. The varint value is the size of the header in bytes including the size varint itself."
let header_start = 0;
// We already read header_len varint. We need to know how many bytes it took.
// Let's restart to be precise.
pos = 0;
let header_len = Self::read_varint(data, &mut pos) as usize;
let header_end = header_start + header_len;
let mut serial_types = Vec::new();
while pos < header_end {
serial_types.push(Self::read_varint(data, &mut pos));
}
let mut values = Vec::new();
for type_code in serial_types {
let (len, type_enum) = match type_code {
0 => (0, SqliteType::Null),
1 => (1, SqliteType::Integer), // 8-bit
2 => (2, SqliteType::Integer), // 16-bit
3 => (3, SqliteType::Integer), // 24-bit
4 => (4, SqliteType::Integer), // 32-bit
5 => (6, SqliteType::Integer), // 48-bit
6 => (8, SqliteType::Integer), // 64-bit
7 => (8, SqliteType::Float),
8 => (0, SqliteType::Integer), // 0
9 => (0, SqliteType::Integer), // 1
n if n >= 12 && n % 2 == 0 => (((n - 12) / 2) as usize, SqliteType::Blob),
n if n >= 13 && n % 2 == 1 => (((n - 13) / 2) as usize, SqliteType::Text),
_ => (0, SqliteType::Null), // Reserved/Internal
};
let val_data = if len > 0 {
if pos + len > data.len() {
return Err(SqliteError::InvalidFormat); // Truncated
}
let d = data[pos..pos + len].to_vec();
pos += len;
d
} else {
Vec::new()
};
values.push(SqliteValue {
data: val_data,
data_type: type_enum,
});
}
Ok(values)
}
/// Scan a table for all records
/// Note: This is a simplified scanner that assumes the table is a B-Tree Leaf or Interior.
/// It traverses the tree.
pub fn scan_table(&mut self, root_page: u32) -> Result<Vec<Vec<SqliteValue>>, SqliteError> {
let mut records = Vec::new();
let mut queue = vec![root_page];
while let Some(page_id) = queue.pop() {
let raw_page = self.read_page(page_id)?;
let page = &raw_page;
// Header offset: 0 unless it's page 1, then 100
let header_offset = if page_id == 1 { 100 } else { 0 };
if page.len() < header_offset + 8 {
continue;
}
let page_type = page[header_offset];
let cell_count =
u16::from_be_bytes([page[header_offset + 3], page[header_offset + 4]]) as usize;
let cell_arr_start = header_offset + 8; // Page 1 header logic is tricky, usually handled by offset
// Logic for Leaf Table (0x0D) and Interior Table (0x05)
match page_type {
0x0D => {
// Leaf Table
for i in 0..cell_count {
let ptr_offset = cell_arr_start + (i * 2);
let cell_ptr =
u16::from_be_bytes([page[ptr_offset], page[ptr_offset + 1]]) as usize;
if cell_ptr >= page.len() {
continue;
}
// Parse cell
let mut pos = cell_ptr;
let _payload_len = Self::read_varint(page, &mut pos);
let _row_id = Self::read_varint(page, &mut pos);
// remaining is payload
// Note: If payload is large, it spills to overflow pages.
// Simplified: We assume payload fits or we just read what's there (might be truncated).
// Chrome logins are small, usually fit.
// To handle overflow properly requires reading (payload_len) bytes.
// For now let's pass the slice from pos to end, parse_record handles header length.
if pos < page.len() {
if let Ok(record) = Self::parse_record(&page[pos..]) {
records.push(record);
}
}
}
}
0x05 => {
// Interior Table
// Iterate cells to find child pages
for i in 0..cell_count {
let ptr_offset = cell_arr_start + (i * 2);
let cell_ptr =
u16::from_be_bytes([page[ptr_offset], page[ptr_offset + 1]]) as usize;
let pos = cell_ptr;
let left_child = u32::from_be_bytes([
page[pos],
page[pos + 1],
page[pos + 2],
page[pos + 3],
]);
queue.push(left_child);
// Key (rowid) follows, but we don't need it for full scan
}
// Right-most child
let right_child = u32::from_be_bytes([
page[header_offset + 8],
page[header_offset + 9],
page[header_offset + 10],
page[header_offset + 11],
]);
queue.push(right_child);
}
_ => {} // Ignore index pages etc
}
}
Ok(records)
}
/// Find root page of a table by name
pub fn find_table_root(&mut self, name: &str) -> Result<u32, SqliteError> {
// Scan sqlite_schema (page 1)
// Note: sqlite_schema is a table rooted at page 1.
let rows = self.scan_table(1)?;
for row in rows {
// Schema: type, name, tbl_name, rootpage, sql
if row.len() >= 4 {
if let Some(type_str) = row[0].as_string() {
if type_str == "table" {
if let Some(tbl_name) = row[1].as_string() {
if tbl_name == name {
// rootpage is 4th column (index 3), usually Integer
if let SqliteType::Integer = row[3].data_type {
// Parse integer manually from LE/BE/Varint? No, parse_record returns raw data
// based on type.
// Wait, parse_record implementation for Integer:
// 1 byte: 8-bit, 2: 16-bit, etc.
// I need a helper to cast data to u32
return Ok(Self::parse_int(&row[3].data) as u32);
}
}
}
}
}
}
}
Err(SqliteError::TableNotFound(name.to_string()))
}
fn parse_int(data: &[u8]) -> i64 {
let mut val = 0i64;
for &b in data {
val = (val << 8) | (b as i64);
}
val
}
}