Re: Bug#1116657: src:libgig: fails to migrate to testing for too long: FTBFS on s390x

Hi,

I was able to figure out what was causing the issue in `test_load24BytesRAM` and got a fix for it.
And now since RIFF tests are passing GIG tests are getting executed and a few tests are failing.
I was able to find fixes for a few of them. But some are still pending and I am still continuing my work on it.
The changes that I have made are as follows.

diff --git a/src/RIFF.cpp b/src/RIFF.cpp
index d5c761e..75bf7a6 100644
--- a/src/RIFF.cpp
+++ b/src/RIFF.cpp
@@ -225,7 +225,13 @@ struct _FileProgress {
         #if POSIX
         if (lseek(hRead, filePos, SEEK_SET) != -1) {
             read(hRead, &ChunkID, 4);
-            read(hRead, &ullCurrentChunkSize, pFile->FileOffsetSize);
+            if (pFile->FileOffsetSize == 4) {
+                uint32_t uiTempCurrentChunkSize;
+                read(hRead, &uiTempCurrentChunkSize, pFile->FileOffsetSize);
+                ullCurrentChunkSize = uiTempCurrentChunkSize;
+            }
+            else
+                read(hRead, &ullCurrentChunkSize, pFile->FileOffsetSize);
         #elif defined(WIN32)
         LARGE_INTEGER liFilePos;
         liFilePos.QuadPart = filePos;
@@ -287,7 +293,12 @@ struct _FileProgress {
         #if POSIX
         if (lseek(hWrite, filePos, SEEK_SET) != -1) {
             write(hWrite, &uiNewChunkID, 4);
-            write(hWrite, &ullNewChunkSize, pFile->FileOffsetSize);
+            if (pFile->FileOffsetSize == 4) {
+                uint32_t uiTempNewChunkSize = ullNewChunkSize;
+                write(hWrite, &uiTempNewChunkSize, pFile->FileOffsetSize);
+            }
+            else
+                write(hWrite, &ullNewChunkSize, pFile->FileOffsetSize);
         }
         #elif defined(WIN32)
         LARGE_INTEGER liFilePos;
@@ -591,6 +602,28 @@ struct _FileProgress {
         }
         file_offset_t writtenWords = fwrite(pData, WordSize, WordCount, io.hWrite);
         #endif // POSIX
+
+        //To revert pData to its native endianness
+        if (!pFile->bEndianNative && WordSize != 1) {
+            switch (WordSize) {
+                case 2:
+                    for (file_offset_t iWord = 0; iWord < WordCount; iWord++)
+                        swapBytes_16((uint16_t*) pData + iWord);
+                    break;
+                case 4:
+                    for (file_offset_t iWord = 0; iWord < WordCount; iWord++)
+                        swapBytes_32((uint32_t*) pData + iWord);
+                    break;
+                case 8:
+                    for (file_offset_t iWord = 0; iWord < WordCount; iWord++)
+                        swapBytes_64((uint64_t*) pData + iWord);
+                    break;
+                default:
+                    for (file_offset_t iWord = 0; iWord < WordCount; iWord++)
+                        swapBytes((uint8_t*) pData + iWord * WordSize, WordSize);
+                    break;
+            }

Thanks,
Pranav