From e451317de64bb573919ddfa085b7ec26c5aa5085 Mon Sep 17 00:00:00 2001
From: Wolfgang Muhsal <muhsal@codinggene.com>
Date: Wed, 15 Mar 2017 10:57:46 +0100
Subject: [PATCH] Public constants for error domain and error codes

---
 SSZipArchive/SSZipArchive.h |  8 ++++++++
 SSZipArchive/SSZipArchive.m | 22 +++++++++++-----------
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/SSZipArchive/SSZipArchive.h b/SSZipArchive/SSZipArchive.h
index 8c77bd1..83b4920 100755
--- a/SSZipArchive/SSZipArchive.h
+++ b/SSZipArchive/SSZipArchive.h
@@ -14,6 +14,14 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+extern NSString *const SSZipArchiveErrorDomain = @"SSZipArchiveErrorDomain";
+typedef NS_ENUM(NSInteger, SSZipArchiveErrorCode) {
+    SSZipArchiveErrorCodeFailedOpenZipFile      = -1,
+    SSZipArchiveErrorCodeFailedOpenFirstFile    = -2,
+    SSZipArchiveErrorCodeFileInfoNotLoadable    = -3,
+    SSZipArchiveErrorCodeFileContentNotReadable = -4,
+};
+
 @protocol SSZipArchiveDelegate;
 
 @interface SSZipArchive : NSObject
diff --git a/SSZipArchive/SSZipArchive.m b/SSZipArchive/SSZipArchive.m
index d2f831c..c1b20cf 100755
--- a/SSZipArchive/SSZipArchive.m
+++ b/SSZipArchive/SSZipArchive.m
@@ -67,8 +67,8 @@
     zipFile zip = unzOpen((const char*)[path UTF8String]);
     if (zip == NULL) {
         if (error) {
-            *error = [NSError errorWithDomain:@"SSZipArchiveErrorDomain"
-                                         code:-1
+            *error = [NSError errorWithDomain:SSZipArchiveErrorDomain
+                                         code:SSZipArchiveErrorCodeFailedOpenZipFile
                                      userInfo:@{NSLocalizedDescriptionKey: @"failed to open zip file"}];
         }
         return NO;
@@ -85,8 +85,8 @@
             if (ret != UNZ_OK) {
                 if (ret != UNZ_BADPASSWORD) {
                     if (error) {
-                        *error = [NSError errorWithDomain:@"SSZipArchiveErrorDomain"
-                                                     code:-2
+                        *error = [NSError errorWithDomain:SSZipArchiveErrorDomain
+                                                     code:SSZipArchiveErrorCodeFailedOpenFirstFile
                                                  userInfo:@{NSLocalizedDescriptionKey: @"failed to open first file in zip file"}];
                     }
                 }
@@ -96,8 +96,8 @@
             ret = unzGetCurrentFileInfo(zip, &fileInfo, NULL, 0, NULL, 0, NULL, 0);
             if (ret != UNZ_OK) {
                 if (error) {
-                    *error = [NSError errorWithDomain:@"SSZipArchiveErrorDomain"
-                                                 code:-3
+                    *error = [NSError errorWithDomain:SSZipArchiveErrorDomain
+                                                 code:SSZipArchiveErrorCodeFileInfoNotLoadable
                                              userInfo:@{NSLocalizedDescriptionKey: @"failed to retrieve info for file"}];
                 }
                 return NO;
@@ -108,8 +108,8 @@
                     // Let's assume the invalid password caused this error
                     if (readBytes != Z_DATA_ERROR) {
                         if (error) {
-                            *error = [NSError errorWithDomain:@"SSZipArchiveErrorDomain"
-                                                         code:-4
+                            *error = [NSError errorWithDomain:SSZipArchiveErrorDomain
+                                                         code:SSZipArchiveErrorCodeFileContentNotReadable
                                                      userInfo:@{NSLocalizedDescriptionKey: @"failed to read contents of file entry"}];
                         }
                     }
@@ -194,7 +194,7 @@
     if (zip == NULL)
     {
         NSDictionary *userInfo = @{NSLocalizedDescriptionKey: @"failed to open zip file"};
-        NSError *err = [NSError errorWithDomain:@"SSZipArchiveErrorDomain" code:-1 userInfo:userInfo];
+        NSError *err = [NSError errorWithDomain:SSZipArchiveErrorDomain code:SSZipArchiveErrorCodeFailedOpenZipFile userInfo:userInfo];
         if (error)
         {
             *error = err;
@@ -217,7 +217,7 @@
     if (unzGoToFirstFile(zip) != UNZ_OK)
     {
         NSDictionary *userInfo = @{NSLocalizedDescriptionKey: @"failed to open first file in zip file"};
-        NSError *err = [NSError errorWithDomain:@"SSZipArchiveErrorDomain" code:-2 userInfo:userInfo];
+        NSError *err = [NSError errorWithDomain:SSZipArchiveErrorDomain code:SSZipArchiveErrorCodeFailedOpenFirstFile userInfo:userInfo];
         if (error)
         {
             *error = err;
@@ -530,7 +530,7 @@
     if (crc_ret == UNZ_CRCERROR)
     {
         NSDictionary *userInfo = @{NSLocalizedDescriptionKey: @"crc check failed for file"};
-        retErr = [NSError errorWithDomain:@"SSZipArchiveErrorDomain" code:-3 userInfo:userInfo];
+        retErr = [NSError errorWithDomain:SSZipArchiveErrorDomain code:SSZipArchiveErrorCodeFileInfoNotLoadable userInfo:userInfo];
     }
     
     if (error) {