X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/e2641e09cc0daf44f63f654230f72d22acf3a9af..f6b32c14f4c8680d2a6b7a4d71758e76ca2c3554:/src/zipmap.c

diff --git a/src/zipmap.c b/src/zipmap.c
index 35faeabe..65ed29c8 100644
--- a/src/zipmap.c
+++ b/src/zipmap.c
@@ -80,6 +80,7 @@
 #include <string.h>
 #include <assert.h>
 #include "zmalloc.h"
+#include "endian.h"
 
 #define ZIPMAP_BIGLEN 254
 #define ZIPMAP_END 255
@@ -108,6 +109,7 @@ static unsigned int zipmapDecodeLength(unsigned char *p) {
 
     if (len < ZIPMAP_BIGLEN) return len;
     memcpy(&len,p+1,sizeof(unsigned int));
+    memrev32ifbe(&len);
     return len;
 }
 
@@ -123,6 +125,7 @@ static unsigned int zipmapEncodeLength(unsigned char *p, unsigned int len) {
         } else {
             p[0] = ZIPMAP_BIGLEN;
             memcpy(p+1,&len,sizeof(len));
+            memrev32ifbe(p+1);
             return 1+sizeof(len);
         }
     }
@@ -144,7 +147,7 @@ static unsigned char *zipmapLookupRaw(unsigned char *zm, unsigned char *key, uns
         /* Match or skip the key */
         l = zipmapDecodeLength(p);
         llen = zipmapEncodeLength(NULL,l);
-        if (k == NULL && l == klen && !memcmp(p+llen,key,l)) {
+        if (key != NULL && k == NULL && l == klen && !memcmp(p+llen,key,l)) {
             /* Only return when the user doesn't care
              * for the total length of the zipmap. */
             if (totlen != NULL) {
@@ -295,7 +298,7 @@ unsigned char *zipmapDel(unsigned char *zm, unsigned char *key, unsigned int kle
     return zm;
 }
 
-/* Call it before to iterate trought elements via zipmapNext() */
+/* Call before iterating through elements via zipmapNext() */
 unsigned char *zipmapRewind(unsigned char *zm) {
     return zm+1;
 }
@@ -360,6 +363,16 @@ unsigned int zipmapLen(unsigned char *zm) {
     return len;
 }
 
+/* Return the raw size in bytes of a zipmap, so that we can serialize
+ * the zipmap on disk (or everywhere is needed) just writing the returned
+ * amount of bytes of the C array starting at the zipmap pointer. */
+size_t zipmapBlobLen(unsigned char *zm) {
+    unsigned int totlen;
+    zipmapLookupRaw(zm,NULL,0,&totlen);
+    return totlen;
+}
+
+#ifdef ZIPMAP_TEST_MAIN
 void zipmapRepr(unsigned char *p) {
     unsigned int l;
 
@@ -374,14 +387,14 @@ void zipmapRepr(unsigned char *p) {
             l = zipmapDecodeLength(p);
             printf("{key %u}",l);
             p += zipmapEncodeLength(NULL,l);
-            fwrite(p,l,1,stdout);
+            if (l != 0 && fwrite(p,l,1,stdout) == 0) perror("fwrite");
             p += l;
 
             l = zipmapDecodeLength(p);
             printf("{value %u}",l);
             p += zipmapEncodeLength(NULL,l);
             e = *p++;
-            fwrite(p,l,1,stdout);
+            if (l != 0 && fwrite(p,l,1,stdout) == 0) perror("fwrite");
             p += l+e;
             if (e) {
                 printf("[");
@@ -393,7 +406,6 @@ void zipmapRepr(unsigned char *p) {
     printf("\n");
 }
 
-#ifdef ZIPMAP_TEST_MAIN
 int main(void) {
     unsigned char *zm;
 
@@ -440,7 +452,7 @@ int main(void) {
                 vlen, vlen, value);
         }
     }
-    printf("\nIterate trought elements:\n");
+    printf("\nIterate through elements:\n");
     {
         unsigned char *i = zipmapRewind(zm);
         unsigned char *key, *value;