From ccd41677d998134ff501a8d6ac3a154dcaca9321 Mon Sep 17 00:00:00 2001
From: Andrii Pientsov <andrii.pientsov@globallogic.com>
Date: Mon, 13 Jul 2020 15:29:38 +0300
Subject: MTX-3404 Code Review

---
 src/MTS_IO_CellularRadio.cpp | 72 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

(limited to 'src/MTS_IO_CellularRadio.cpp')

diff --git a/src/MTS_IO_CellularRadio.cpp b/src/MTS_IO_CellularRadio.cpp
index bb7cd40..0acf607 100644
--- a/src/MTS_IO_CellularRadio.cpp
+++ b/src/MTS_IO_CellularRadio.cpp
@@ -1262,3 +1262,75 @@ const char *CellularRadio::RadioBandMap::getRadioBandName(const std::string &cha
 
     return band;
 }
+
+ICellularRadio::CODE CellularRadio::getFileSize(int fd, size_t& nBytes, size_t& nChunks) {
+    CODE rc = FAILURE;
+
+    do {
+        ssize_t dScrollPos;
+        dScrollPos = lseek(fd, 0, SEEK_SET);
+        if (dScrollPos < 0) {
+            printError("Failed to seek to the start of the file: %d", errno);
+            break;
+        }
+
+        dScrollPos = lseek(fd, 0, SEEK_END);
+        if (dScrollPos < 0) {
+            printError("Failed to determine the file size: %d", errno);
+            break;
+        }
+
+        nBytes = static_cast<size_t>(dScrollPos);
+        nChunks = (nBytes + FILE_CHUNK_SIZE - 1) / FILE_CHUNK_SIZE;  // round up
+
+        rc = SUCCESS;
+
+    } while (false);
+
+    lseek(fd, 0, SEEK_SET);
+    return rc;
+}
+
+ICellularRadio::CODE CellularRadio::readChunk(int fd, char* pChunk, size_t dChunkSize, size_t& nReadBytes) {
+    size_t nUsedBuffer = 0;
+    CODE rc = FAILURE;
+
+    while (true) {
+
+        if (nUsedBuffer > dChunkSize) {
+            printError("Internal pointer error, abort upload: %d", nUsedBuffer);
+            rc = ERROR;
+            break;
+        }
+
+        if (nUsedBuffer == dChunkSize) {
+            // full chunk received
+            rc = SUCCESS;
+            nReadBytes = dChunkSize;
+            break;
+        }
+
+        char* pData = pChunk + nUsedBuffer;
+        size_t nFreeBuffer = dChunkSize - nUsedBuffer;
+
+        ssize_t dReadCount = read(fd, pData, nFreeBuffer);
+        if (dReadCount < 0) {
+            printError("Failed to read from the source file: %d", errno);
+            rc = ERROR;
+            break;
+        }
+
+        size_t duReadCount = static_cast<size_t>(dReadCount);
+        if (duReadCount == 0) {
+            // EOF. Return what was already read
+            nReadBytes = nUsedBuffer;
+            rc = SUCCESS;
+            break;
+        }
+
+        nUsedBuffer += duReadCount;
+
+    }
+
+    return rc;
+}
-- 
cgit v1.2.3