1.增加文件MD5校验码获取方法。

RedAnt ERP Mobile/common/RAUtils.h

@@ -68,5 +68,6 @@
 + (void)saveData:(NSData *)data toPath:(NSString *)path;
 + (void)removeFileAtPath:(NSString *)path;
 + (NSString *)appCacheDirectory;
++(NSString*)md5WithFile:(NSString*)path;
 
 @end

RedAnt ERP Mobile/common/RAUtils.m

@@ -14,9 +14,13 @@
 #import "const.h"
 #import "AppDelegate.h"
 #import "Singleton.h"
-
+#include <CommonCrypto/CommonDigest.h>
 
 #import "ZipArchive.h"
+
+#define FileHashDefaultChunkSizeForReadingData 1024*8
+
+
 @implementation RAUtils
 
 
@@ -889,6 +893,71 @@ begin:
     return [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];
 }
 
++(NSString*)md5WithFile:(NSString*)path
+{
+    return (__bridge_transfer NSString *)FileMD5HashCreateWithPath((__bridge CFStringRef)path, FileHashDefaultChunkSizeForReadingData);
+}
+
+CFStringRef FileMD5HashCreateWithPath(CFStringRef filePath,size_t chunkSizeForReadingData) {
+    // Declare needed variables
+    CFStringRef result = NULL;
+    CFReadStreamRef readStream = NULL;
+    // Get the file URL
+    CFURLRef fileURL =
+    CFURLCreateWithFileSystemPath(kCFAllocatorDefault,
+                                  (CFStringRef)filePath,
+                                  kCFURLPOSIXPathStyle,
+                                  (Boolean)false);
+    if (!fileURL) goto done;
+    // Create and open the read stream
+    readStream = CFReadStreamCreateWithFile(kCFAllocatorDefault,
+                                            (CFURLRef)fileURL);
+    if (!readStream) goto done;
+    bool didSucceed = (bool)CFReadStreamOpen(readStream);
+    if (!didSucceed) goto done;
+    // Initialize the hash object
+    CC_MD5_CTX hashObject;
+    CC_MD5_Init(&hashObject);
+    // Make sure chunkSizeForReadingData is valid
+    if (!chunkSizeForReadingData) {
+        chunkSizeForReadingData = FileHashDefaultChunkSizeForReadingData;
+    }
+    // Feed the data to the hash object
+    bool hasMoreData = true;
+    while (hasMoreData) {
+        uint8_t buffer[chunkSizeForReadingData];
+        CFIndex readBytesCount = CFReadStreamRead(readStream,(UInt8 *)buffer,(CFIndex)sizeof(buffer));
+        if (readBytesCount == -1) break;
+        if (readBytesCount == 0) {
+            hasMoreData = false;
+            continue;
+        }
+        CC_MD5_Update(&hashObject,(const void *)buffer,(CC_LONG)readBytesCount);
+    }
+    // Check if the read operation succeeded
+    didSucceed = !hasMoreData;
+    // Compute the hash digest
+    unsigned char digest[CC_MD5_DIGEST_LENGTH];
+    CC_MD5_Final(digest, &hashObject);
+    // Abort if the read operation failed
+    if (!didSucceed) goto done;
+    // Compute the string result
+    char hash[2 * sizeof(digest) + 1];
+    for (size_t i = 0; i < sizeof(digest); ++i) {
+        snprintf(hash + (2 * i), 3, "%02x", (int)(digest[i]));
+    }
+    result = CFStringCreateWithCString(kCFAllocatorDefault,(const char *)hash,kCFStringEncodingUTF8);
+    
+done:
+    if (readStream) {
+        CFReadStreamClose(readStream);
+        CFRelease(readStream);
+    }
+    if (fileURL) {
+        CFRelease(fileURL);
+    }
+    return result;
+}
 @end