Fix pack compile problems caused by strlen

- Removed strlen usage
- Added unit testing to protect the change
- Fixed some bugs found with the unit test

src/rendering/tools/pack.c

@@ -149,21 +149,47 @@ void packReadInt(PackStream* stream, int* value)
 void packWriteString(PackStream* stream, char* value, int max_length)
 {
     int written;
-    int len = strnlen(value, max_length - 1) + 1;
+    int len = 0;
+    while (len < max_length - 1 && value[len] != '\0')
+    {
+        len++;
+    }
     packWriteInt(stream, &len);
-    written = fwrite(value, 1, len, stream->fd);
-    assert(written == len);
+    if (len > 0)
+    {
+        written = fwrite(value, 1, len, stream->fd);
+        assert(written == len);
+    }
 }
 
 void packReadString(PackStream* stream, char* value, int max_length)
 {
     int read;
-    int len;
+    int len, clen;
+
     packReadInt(stream, &len);
-    if (len > max_length)
+
+    if (len > max_length - 1)
     {
-        len = max_length;
+        clen = max_length - 1;
+    }
+    else
+    {
+        clen = len;
+    }
+
+    if (clen > 0)
+    {
+        read = fread(value, 1, clen, stream->fd);
+        assert(read == clen);
+        value[clen] = '\0';
+
+        if (clen < len)
+        {
+            /* Read rest of the string, discarding it */
+            char* buffer = malloc(len - clen);
+            fread(buffer, 1, len - clen, stream->fd);
+            free(buffer);
+        }
     }
-    read = fread(value, 1, len, stream->fd);
-    assert(read == len);
 }

src/testing/main.c

@@ -12,6 +12,7 @@ extern void test_render_case(Suite* s);
 extern void test_noise_case(Suite* s);
 extern void test_terrain_painting_case(Suite* s);
 extern void test_bruneton_case(Suite* s);
+extern void test_pack_case(Suite* s);
 
 int main(int argc, char** argv)
 {
@@ -30,6 +31,7 @@ int main(int argc, char** argv)
     test_noise_case(s);
     test_terrain_painting_case(s);
     test_bruneton_case(s);
+    test_pack_case(s);
 
     SRunner *sr = srunner_create(s);
     srunner_run_all(sr, CK_NORMAL);

src/testing/test_pack.c

@@ -0,0 +1,54 @@
+#include "testing/common.h"
+
+#include "rendering/tools/pack.h"
+
+START_TEST(testPack)
+{
+    PackStream* stream;
+    int i;
+    int data_i;
+    double data_d;
+    char* data_s;
+    char buffer[100];
+
+    /* Writing to pack */
+    stream = packWriteFile("/tmp/test_paysages_pack");
+    for (i = 0; i < 5; i++)
+    {
+        data_i = i;
+        packWriteInt(stream, &data_i);
+
+        data_d = (double)i;
+        packWriteDouble(stream, &data_d);
+
+        data_s = "Testing string 0123 !";
+        packWriteString(stream, data_s, 100);
+        packWriteString(stream, data_s, 4);
+        packWriteString(stream, data_s, 5);
+    }
+    packCloseStream(stream);
+
+    /* Reading from pack */
+    stream = packReadFile("/tmp/test_paysages_pack");
+    for (i = 0; i < 5; i++)
+    {
+        packReadInt(stream, &data_i);
+        ck_assert_int_eq(data_i, i);
+
+        packReadDouble(stream, &data_d);
+        ck_assert_double_eq(data_d, (double)i);
+
+        packReadString(stream, buffer, 100);
+        ck_assert_str_eq(buffer, "Testing string 0123 !");
+        packReadString(stream, buffer, 4);
+        ck_assert_str_eq(buffer, "Tes");
+        packReadString(stream, buffer, 3);
+        ck_assert_str_eq(buffer, "Te");
+    }
+    packCloseStream(stream);
+}
+END_TEST
+
+TEST_CASE(pack,
+        testPack)
+