diff --git a/src/os/csv/csv_flavours.php b/src/os/csv/csv_flavours.php
new file mode 100644
index 0000000..c240249
--- /dev/null
+++ b/src/os/csv/csv_flavours.php
@@ -0,0 +1,46 @@
+<?php
+namespace nur\sery\os\csv;
+
+use nur\A;
+use nur\ref\ref_csv;
+
+class csv_flavours {
+  const MAP = [
+    "oo" => ref_csv::OO_FLAVOUR,
+    "ooffice" => ref_csv::OO_FLAVOUR,
+    ref_csv::OO_NAME => ref_csv::OO_FLAVOUR,
+    "xl" => ref_csv::XL_FLAVOUR,
+    "excel" => ref_csv::XL_FLAVOUR,
+    ref_csv::XL_NAME => ref_csv::XL_FLAVOUR,
+  ];
+  
+  const ENCODINGS = [
+    ref_csv::OO_FLAVOUR => ref_csv::OO_ENCODING,
+    ref_csv::XL_FLAVOUR => ref_csv::XL_ENCODING,
+  ];
+  
+  static final function verifix(string $flavour): string {
+    $lflavour = strtolower($flavour);
+    if (array_key_exists($lflavour, self::MAP)) {
+      $flavour = self::MAP[$lflavour];
+    }
+    if (strlen($flavour) < 1) $flavour .= ",";
+    if (strlen($flavour) < 2) $flavour .= "\"";
+    if (strlen($flavour) < 3) $flavour .= "\\";
+    return $flavour;
+  }
+
+  static final function get_name(string $flavour): string {
+    if ($flavour == ref_csv::OO_FLAVOUR) return ref_csv::OO_NAME;
+    elseif ($flavour == ref_csv::XL_FLAVOUR) return ref_csv::XL_NAME;
+    else return $flavour;
+  }
+  
+  static final function get_params(string $flavour): array {
+    return [$flavour[0], $flavour[1], $flavour[2]];
+  }
+
+  static final function get_encoding(string $flavour): ?string {
+    return A::get(self::ENCODINGS, $flavour);
+  }
+}
diff --git a/src/os/file/Stream.php b/src/os/file/Stream.php
index b9767f5..4ed0296 100644
--- a/src/os/file/Stream.php
+++ b/src/os/file/Stream.php
@@ -2,9 +2,11 @@
 namespace nur\sery\os\file;
 
 use nur\sery\NoMoreDataException;
+use nur\sery\os\csv\csv_flavours;
 use nur\sery\os\EOFException;
 use nur\sery\os\IOException;
 use nur\sery\php\iter\AbstractIterator;
+use nur\sery\ref\os\csv\ref_csv;
 use nur\sery\str;
 use nur\sery\ValueException;
 
@@ -139,6 +141,40 @@ class Stream extends AbstractIterator implements IReader, IWriter {
     if ($closeReader) $this->close();
   }
 
+  const DEFAULT_CSV_FLAVOUR = ref_csv::OO_FLAVOUR;
+
+  /** @var array paramètres pour la lecture et l'écriture de flux au format CSV */
+  protected $csvFlavour;
+
+  function setCsvFlavour(string $flavour): void {
+    $this->csvFlavour = csv_flavours::verifix($flavour);
+  }
+
+  protected function getCsvParams($fd): array {
+    $flavour = $this->csvFlavour;
+    if ($flavour === null) {
+      if ($fd === null) {
+        # utiliser la valeur par défaut
+        $flavour = static::DEFAULT_CSV_FLAVOUR;
+      } else {
+        # il faut déterminer le type de fichier CSV en lisant la première ligne
+        $pos = IOException::ensure_valid(ftell($fd));
+        $line = IOException::ensure_valid(fgets($fd));
+        $line = strpbrk($line, ",;\t");
+        if ($line === false) {
+          # aucun séparateur trouvé, prender la valeur par défaut
+          $flavour = static::DEFAULT_CSV_FLAVOUR;
+        } else {
+          $flavour = substr($line, 0, 1);
+          $flavour = csv_flavours::verifix($flavour);
+        }
+        IOException::ensure_valid(fseek($fd, $pos), true, -1);
+      }
+      $this->csvFlavour = $flavour;
+    }
+    return csv_flavours::get_params($flavour);
+  }
+
   #############################################################################
   # Reader
 
@@ -168,6 +204,18 @@ class Stream extends AbstractIterator implements IReader, IWriter {
     return IOException::ensure_valid(fpassthru($fd), $this->throwOnError);
   }
 
+  /**
+   * retourner la prochaine ligne au format CSV ou null si le fichier est arrivé
+   * à sa fin
+   */
+  function fgetcsv(): ?array {
+    $fd = $this->getResource();
+    $params = $this->getCsvParams($fd);
+    $row = fgetcsv($fd, 0, $params[0], $params[1], $params[2]);
+    if ($row === false && feof($fd)) return null;
+    return IOException::ensure_valid($row, $this->throwOnError);
+  }
+
   /**
    * lire la prochaine ligne. la ligne est retournée *sans* le caractère de fin
    * de ligne [\r]\n
@@ -267,6 +315,12 @@ class Stream extends AbstractIterator implements IReader, IWriter {
     return IOException::ensure_valid($r, $this->throwOnError);
   }
 
+  function fputcsv(array $row): void {
+    $fd = $this->getResource();
+    $params = $this->getCsvParams($fd);
+    IOException::ensure_valid(fputcsv($fd, $row, $params[0], $params[1], $params[2]));
+  }
+
   /** @throws IOException */
   function fflush(): self {
     $fd = $this->getResource();
diff --git a/src/ref/os/csv/ref_csv.php b/src/ref/os/csv/ref_csv.php
new file mode 100644
index 0000000..dceb0a8
--- /dev/null
+++ b/src/ref/os/csv/ref_csv.php
@@ -0,0 +1,20 @@
+<?php
+namespace nur\sery\ref\os\csv;
+
+/**
+ * Class ref_csv: références des valeurs normalisées pour les fichiers CSV à
+ * destination de Microsoft Excel et de LibreOffice Calc
+ */
+class ref_csv {
+  const UTF8 = "utf-8";
+  const CP1252 = "cp1252";
+  const LATIN1 = "iso-8859-1";
+
+  const OO_NAME = "oocalc";
+  const OO_FLAVOUR = ",\"\\";
+  const OO_ENCODING = self::UTF8;
+  
+  const XL_NAME = "msexcel";
+  const XL_FLAVOUR = ";\"\\";
+  const XL_ENCODING = self::CP1252;
+}
diff --git a/tests/os/file/FileReaderTest.php b/tests/os/file/FileReaderTest.php
new file mode 100644
index 0000000..37d48dd
--- /dev/null
+++ b/tests/os/file/FileReaderTest.php
@@ -0,0 +1,62 @@
+<?php
+namespace nur\sery\os\file;
+
+use PHPUnit\Framework\TestCase;
+
+class FileReaderTest extends TestCase {
+  function testIgnoreBom() {
+    # la lecture avec et sans BOM doit être identique
+    ## sans BOM
+    $reader = new FileReader(__DIR__.'/impl/sans_bom.txt');
+    self::assertSame("0123456789", $reader->fread(10));
+    self::assertSame(10, $reader->ftell());
+    $reader->seek(30);
+    self::assertSame("abcdefghij", $reader->fread(10));
+    self::assertSame(40, $reader->ftell());
+    $reader->seek(10);
+    self::assertSame("ABCDEFGHIJ", $reader->fread(10));
+    self::assertSame(20, $reader->ftell());
+    $reader->seek(40);
+    self::assertSame("0123456789\n", $reader->getContents());
+    $reader->close();
+    ## avec BOM
+    $reader = new FileReader(__DIR__.'/impl/avec_bom.txt');
+    self::assertSame("0123456789", $reader->fread(10));
+    self::assertSame(10, $reader->ftell());
+    $reader->seek(30);
+    self::assertSame("abcdefghij", $reader->fread(10));
+    self::assertSame(40, $reader->ftell());
+    $reader->seek(10);
+    self::assertSame("ABCDEFGHIJ", $reader->fread(10));
+    self::assertSame(20, $reader->ftell());
+    $reader->seek(40);
+    self::assertSame("0123456789\n", $reader->getContents());
+    $reader->close();
+  }
+
+  function testCsvAutoParams() {
+    $reader = new FileReader(__DIR__.'/impl/msexcel.csv');
+    self::assertSame(["nom", "prenom", "age"], $reader->fgetcsv());
+    self::assertSame(["clain", "jephte", "50"], $reader->fgetcsv());
+    self::assertNull($reader->fgetcsv());
+    $reader->close();
+
+    $reader = new FileReader(__DIR__.'/impl/ooffice.csv');
+    self::assertSame(["nom", "prenom", "age"], $reader->fgetcsv());
+    self::assertSame(["clain", "jephte", "50"], $reader->fgetcsv());
+    self::assertNull($reader->fgetcsv());
+    $reader->close();
+
+    $reader = new FileReader(__DIR__.'/impl/weird.tsv');
+    self::assertSame(["nom", "prenom", "age"], $reader->fgetcsv());
+    self::assertSame(["clain", "jephte", "50"], $reader->fgetcsv());
+    self::assertNull($reader->fgetcsv());
+    $reader->close();
+
+    $reader = new FileReader(__DIR__.'/impl/avec_bom.csv');
+    self::assertSame(["nom", "prenom", "age"], $reader->fgetcsv());
+    self::assertSame(["clain", "jephte", "50"], $reader->fgetcsv());
+    self::assertNull($reader->fgetcsv());
+    $reader->close();
+  }
+}
diff --git a/tests/os/file/impl/avec_bom.csv b/tests/os/file/impl/avec_bom.csv
new file mode 100644
index 0000000..d1512a2
--- /dev/null
+++ b/tests/os/file/impl/avec_bom.csv
@@ -0,0 +1,2 @@
+nom,prenom,age
+clain,jephte,50
diff --git a/tests/os/file/impl/avec_bom.txt b/tests/os/file/impl/avec_bom.txt
new file mode 100644
index 0000000..9e55899
--- /dev/null
+++ b/tests/os/file/impl/avec_bom.txt
@@ -0,0 +1 @@
+0123456789ABCDEFGHIJ0123456789abcdefghij0123456789
diff --git a/tests/os/file/impl/msexcel.csv b/tests/os/file/impl/msexcel.csv
new file mode 100644
index 0000000..b2d95c4
--- /dev/null
+++ b/tests/os/file/impl/msexcel.csv
@@ -0,0 +1,2 @@
+nom;prenom;age
+clain;jephte;50
diff --git a/tests/os/file/impl/ooffice.csv b/tests/os/file/impl/ooffice.csv
new file mode 100644
index 0000000..f00d4ff
--- /dev/null
+++ b/tests/os/file/impl/ooffice.csv
@@ -0,0 +1,2 @@
+nom,prenom,age
+clain,jephte,50
diff --git a/tests/os/file/impl/sans_bom.txt b/tests/os/file/impl/sans_bom.txt
new file mode 100644
index 0000000..f16e49f
--- /dev/null
+++ b/tests/os/file/impl/sans_bom.txt
@@ -0,0 +1 @@
+0123456789ABCDEFGHIJ0123456789abcdefghij0123456789
diff --git a/tests/os/file/impl/weird.tsv b/tests/os/file/impl/weird.tsv
new file mode 100644
index 0000000..cd8bf3a
--- /dev/null
+++ b/tests/os/file/impl/weird.tsv
@@ -0,0 +1,2 @@
+nom	prenom	age
+clain	jephte	50