Initial move of common python bits into modules of the 'oe' python package

Signed-off-by: Chris Larson <chris_larson@mentor.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/lib/oe/qa.py b/lib/oe/qa.py
new file mode 100644
index 0000000000..01813931bb
--- /dev/null
+++ b/lib/oe/qa.py
@@ -0,0 +1,76 @@
+class ELFFile:
+    EI_NIDENT = 16
+
+    EI_CLASS      = 4
+    EI_DATA       = 5
+    EI_VERSION    = 6
+    EI_OSABI      = 7
+    EI_ABIVERSION = 8
+
+    # possible values for EI_CLASS
+    ELFCLASSNONE = 0
+    ELFCLASS32   = 1
+    ELFCLASS64   = 2
+
+    # possible value for EI_VERSION
+    EV_CURRENT   = 1
+
+    # possible values for EI_DATA
+    ELFDATANONE  = 0
+    ELFDATA2LSB  = 1
+    ELFDATA2MSB  = 2
+
+    def my_assert(self, expectation, result):
+        if not expectation == result:
+            #print "'%x','%x' %s" % (ord(expectation), ord(result), self.name)
+            raise Exception("This does not work as expected")
+
+    def __init__(self, name, bits32):
+        self.name = name
+        self.bits32 = bits32
+
+    def open(self):
+        self.file = file(self.name, "r")
+        self.data = self.file.read(ELFFile.EI_NIDENT+4)
+
+        self.my_assert(len(self.data), ELFFile.EI_NIDENT+4)
+        self.my_assert(self.data[0], chr(0x7f) )
+        self.my_assert(self.data[1], 'E')
+        self.my_assert(self.data[2], 'L')
+        self.my_assert(self.data[3], 'F')
+        if self.bits32 :
+            self.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS32))
+        else:
+            self.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS64))
+        self.my_assert(self.data[ELFFile.EI_VERSION], chr(ELFFile.EV_CURRENT) )
+
+        self.sex = self.data[ELFFile.EI_DATA]
+        if self.sex == chr(ELFFile.ELFDATANONE):
+            raise Exception("self.sex == ELFDATANONE")
+        elif self.sex == chr(ELFFile.ELFDATA2LSB):
+            self.sex = "<"
+        elif self.sex == chr(ELFFile.ELFDATA2MSB):
+            self.sex = ">"
+        else:
+            raise Exception("Unknown self.sex")
+
+    def osAbi(self):
+        return ord(self.data[ELFFile.EI_OSABI])
+
+    def abiVersion(self):
+        return ord(self.data[ELFFile.EI_ABIVERSION])
+
+    def isLittleEndian(self):
+        return self.sex == "<"
+
+    def isBigEngian(self):
+        return self.sex == ">"
+
+    def machine(self):
+        """
+        We know the sex stored in self.sex and we
+        know the position
+        """
+        import struct
+        (a,) = struct.unpack(self.sex+"H", self.data[18:20])
+        return a