Merge pull request #1441 from chrox/master

fix cannot login Evernote

base

@@ -1 +1 @@
-Subproject commit e9f64794e04e22d6cea4bf4f84fa215fc396455c
+Subproject commit 9aa76dc818c7d874e9dd09a903722915be63af09

frontend/MD5.lua

@@ -208,14 +208,25 @@ local function bin2str(output, input, len)
     end
 end
 
-local function md5(luastr)
+local md5 = {}
+
+function md5:new()
+    self.ctx = ffi.new("MD5_CTX")
+    MD5Init(self.ctx)
+end
+
+function md5:update(luastr)
+    MD5Update(self.ctx, ffi.cast("const char*", luastr), #luastr)
+end
+
+function md5:sum(luastr)
     local buf = ffi.new("char[33]")
     local hash = ffi.new("uint8_t[16]")
-    local ctx = ffi.new("MD5_CTX")
-
-    MD5Init(ctx)
-    MD5Update(ctx, ffi.cast("const char*", luastr), #luastr)
-    MD5Final(hash, ctx)
+    if luastr then
+        md5:new()
+        md5:update(luastr)
+    end
+    MD5Final(hash, self.ctx)
 
     bin2str(buf, hash, ffi.sizeof(hash))
 

frontend/cache.lua

@@ -122,7 +122,7 @@ function Cache:check(key, ItemClass)
         end
         return self.cache[key]
     elseif ItemClass then
-        local cached = self.cached[md5(key)]
+        local cached = self.cached[md5:sum(key)]
         if cached then
             local item = ItemClass:new{}
             local ok, msg = pcall(item.load, item, cached)
@@ -159,7 +159,7 @@ function Cache:serialize()
         -- only dump cache item that requests serialization explicitly
         if cache_item.persistent and cache_item.dump then
             DEBUG("dump cache item", key)
-            cache_size = cache_item:dump(cache_path..md5(key)) or 0
+            cache_size = cache_item:dump(cache_path..md5:sum(key)) or 0
             if cache_size > 0 then break end
         end
     end

frontend/document/document.lua

@@ -99,6 +99,36 @@ function Document:discardChange()
     self.is_edited = false
 end
 
+-- calculate partial digest of the document
+-- since only PDF documents could be modified by koreader by appending data
+-- at the end of the files when highlighting, we use a non-even sampling
+-- algorithm which samples with larger weight at file head and much smaller
+-- weight at file tail, thus reduces the probability that appended data may change
+-- the digest value.
+-- Note that if PDF file size is around 1024, 4096, 16384, 65536, 262144
+-- 1048576, 4194304, 16777216, 67108864, 268435456 or 1073741824, appending data
+-- by highlighting in koreader may change the digest value.
+function Document:fastDigest()
+    local md5 = require("MD5")
+    local lshift = bit.lshift
+    local file = io.open(self.file, 'rb')
+    if file then
+        local step, size = 1024, 1024
+        md5:new()
+        for i = -1, 10 do
+            file:seek("set", lshift(step, 2*i))
+            local sample = file:read(size)
+            if sample then
+                md5:update(sample)
+            else
+                break
+            end
+        end
+        file:close()
+        return md5:sum()
+    end
+end
+
 -- this might be overridden by a document implementation
 function Document:getNativePageDimensions(pageno)
     local hash = "pgdim|"..self.file.."|"..pageno

reader.lua

@@ -1,18 +1,28 @@
 #!./luajit
 
+-- load default settings
 require "defaults"
 pcall(dofile, "defaults.persistent.lua")
-package.path = "?.lua;common/?.lua;frontend/?.lua"
-package.cpath = "?.so;common/?.so;common/?.dll;/usr/lib/lua/?.so"
 
+-- set search path for 'require()'
+package.path = "common/?.lua;frontend/?.lua;" .. package.path
+package.cpath = "common/?.so;common/?.dll;/usr/lib/lua/?.so;" .. package.cpath
+
+-- set search path for 'ffi.load()'
 local ffi = require("ffi")
+local util = require("ffi/util")
+ffi.cdef[[
+    char *getenv(const char *name);
+    int putenv(const char *envvar);
+    int _putenv(const char *envvar);
+]]
 if ffi.os == "Windows" then
-    ffi.cdef[[
-        int _putenv(const char *envvar);
-    ]]
     ffi.C._putenv("PATH=libs;common;")
-    --ffi.C._putenv("EMULATE_READER_W=480")
-    --ffi.C._putenv("EMULATE_READER_H=600")
+else
+    ffi.C.putenv("LD_LIBRARY_PATH="
+        .. util.realpath("libs") .. ":"
+        .. util.realpath("common") ..":"
+        .. ffi.string(ffi.C.getenv("LD_LIBRARY_PATH")))
 end
 
 local DocSettings = require("docsettings")

spec/unit/document_spec.lua

@@ -28,6 +28,9 @@ describe("PDF document module", function()
         local clip1 = doc:clipPagePNGString(pos0, pos1, pboxes, "lighten")
         assert.truthy(clip1)
     end)
+    it("should calculate fast digest", function()
+        assert.is_equal(doc:fastDigest(), "41cce710f34e5ec21315e19c99821415")
+    end)
     it("should close document", function()
         doc:close()
     end)
@@ -45,6 +48,9 @@ describe("EPUB document module", function()
         assert.are.same(image:getWidth(), 442)
         assert.are.same(image:getHeight(), 616)
     end)
+    it("should calculate fast digest", function()
+        assert.is_equal(doc:fastDigest(), "59d481d168cca6267322f150c5f6a2a3")
+    end)
     it("should close document", function()
         doc:close()
     end)

spec/unit/md5_spec.lua

@@ -4,9 +4,16 @@ local md5 = require("MD5")
 
 describe("MD5 module", function()
     it("should calculate correct MD5 hashes", function()
-        assert.is_equal(md5(""), "d41d8cd98f00b204e9800998ecf8427e")
-        assert.is_equal(md5("\0"), "93b885adfe0da089cdf634904fd59f71")
-        assert.is_equal(md5("0123456789abcdefX"), "1b05aba914a8b12315c7ee52b42f3d35")
+        assert.is_equal(md5:sum(""), "d41d8cd98f00b204e9800998ecf8427e")
+        assert.is_equal(md5:sum("\0"), "93b885adfe0da089cdf634904fd59f71")
+        assert.is_equal(md5:sum("0123456789abcdefX"), "1b05aba914a8b12315c7ee52b42f3d35")
+    end)
+    it("should calculate MD5 sum by updating", function()
+        md5:new()
+        md5:update("0123456789")
+        md5:update("abcdefghij")
+        local md5sum = md5:sum()
+        assert.is_equal(md5sum, md5:sum("0123456789abcdefghij"))
     end)
 end)