Just adding support for a "minor" version number.

storage/archive/archive_reader.c

@@ -41,9 +41,10 @@ int main(int argc, char *argv[])
   }
 
   printf("Version %u\n", reader_handle.version);
-  printf("\tStart position %llu\n", (unsigned long long)reader_handle.start);
   if (reader_handle.version > 2)
   {
+    printf("\tMinor version %u\n", reader_handle.minor_version);
+    printf("\tStart position %llu\n", (unsigned long long)reader_handle.start);
     printf("\tBlock size %u\n", reader_handle.block_size);
     printf("\tRows %llu\n", reader_handle.rows);
     printf("\tAutoincrement %llu\n", reader_handle.auto_increment);

storage/archive/archive_test.c

@@ -94,7 +94,7 @@ int main(int argc, char *argv[])
   azflush(&reader_handle,  Z_SYNC_FLUSH);
   assert(reader_handle.rows == TEST_LOOP_NUM);
   assert(reader_handle.auto_increment == 0);
-  assert(reader_handle.check_point == 61);
+  assert(reader_handle.check_point == 62);
   assert(reader_handle.forced_flushes == 1);
   assert(reader_handle.dirty == AZ_STATE_SAVED);
 
@@ -102,7 +102,7 @@ int main(int argc, char *argv[])
   azflush(&writer_handle, Z_SYNC_FLUSH);
   assert(writer_handle.rows == TEST_LOOP_NUM);
   assert(writer_handle.auto_increment == 4);
-  assert(writer_handle.check_point == 61);
+  assert(writer_handle.check_point == 62);
   assert(writer_handle.forced_flushes == 2);
   assert(writer_handle.dirty == AZ_STATE_SAVED);
 
@@ -181,7 +181,7 @@ int main(int argc, char *argv[])
   azflush(&reader_handle,  Z_SYNC_FLUSH);
   assert(reader_handle.rows == 102);
   assert(reader_handle.auto_increment == 4);
-  assert(reader_handle.check_point == 1255);
+  assert(reader_handle.check_point == 1256);
   assert(reader_handle.forced_flushes == 4);
   assert(reader_handle.dirty == AZ_STATE_SAVED);
 

storage/archive/azio.c

@@ -17,7 +17,7 @@
 #include <string.h>
 
 static int const gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
-static int const az_magic[2] = {0xfe, 0x03}; /* az magic header */
+static int const az_magic[3] = {0xfe, 0x03, 0x01}; /* az magic header */
 
 /* gzip flag byte */
 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
@@ -69,6 +69,7 @@ int az_open (azio_stream *s, const char *path, int Flags, File fd)
   s->transparent = 0;
   s->mode = 'r';
   s->version = (unsigned char)az_magic[1]; /* this needs to be a define to version */
+  s->version = (unsigned char)az_magic[2]; /* minor version */
 
   /*
     We do our own version of append by nature. 
@@ -155,12 +156,14 @@ void write_header(azio_stream *s)
   s->start = AZHEADER_SIZE + AZMETA_BUFFER_SIZE;
   s->block_size= AZ_BUFSIZE;
   s->version = (unsigned char)az_magic[1];
+  s->minor_version = (unsigned char)az_magic[2];
 
 
   /* Write a very simple .az header: */
   memset(buffer, 0, AZHEADER_SIZE + AZMETA_BUFFER_SIZE);
   *(ptr + AZ_MAGIC_POS)= az_magic[0];
   *(ptr + AZ_VERSION_POS)= (unsigned char)s->version;
+  *(ptr + AZ_MINOR_VERSION_POS)= (unsigned char)s->minor_version;
   *(ptr + AZ_BLOCK_POS)= (unsigned char)(s->block_size/1024); /* Reserved for block size */
   *(ptr + AZ_STRATEGY_POS)= (unsigned char)Z_DEFAULT_STRATEGY; /* Compression Type */
 
@@ -314,6 +317,7 @@ void read_header(azio_stream *s, unsigned char *buffer)
   if (buffer[0] == az_magic[0]  && buffer[1] == az_magic[1])
   {
     s->version= (unsigned int)buffer[AZ_VERSION_POS];
+    s->minor_version= (unsigned int)buffer[AZ_MINOR_VERSION_POS];
     s->block_size= 1024 * buffer[AZ_BLOCK_POS];
     s->start= (unsigned long long)uint8korr(buffer + AZ_START_POS);
     s->rows= (unsigned long long)uint8korr(buffer + AZ_ROW_POS);

storage/archive/azlib.h

@@ -51,22 +51,23 @@ extern "C" {
   + sizeof(unsigned int) + sizeof(unsigned int) \
   + sizeof(unsigned char)
 
-#define AZHEADER_SIZE 20
+#define AZHEADER_SIZE 21
 
 #define AZ_MAGIC_POS 0
 #define AZ_VERSION_POS 1
-#define AZ_BLOCK_POS 2
-#define AZ_STRATEGY_POS 3
-#define AZ_FRM_POS 4
-#define AZ_META_POS 8
-#define AZ_START_POS 12
-#define AZ_ROW_POS 20
-#define AZ_FLUSH_POS 28
-#define AZ_CHECK_POS 36
-#define AZ_AUTOINCREMENT_POS 44
-#define AZ_LONGEST_POS 52
-#define AZ_SHORTEST_POS 56
-#define AZ_DIRTY_POS 60
+#define AZ_MINOR_VERSION_POS 2
+#define AZ_BLOCK_POS 3
+#define AZ_STRATEGY_POS 4
+#define AZ_FRM_POS 5
+#define AZ_META_POS 9
+#define AZ_START_POS 13
+#define AZ_ROW_POS 21
+#define AZ_FLUSH_POS 29
+#define AZ_CHECK_POS 37
+#define AZ_AUTOINCREMENT_POS 45
+#define AZ_LONGEST_POS 53
+#define AZ_SHORTEST_POS 57
+#define AZ_DIRTY_POS 61
 
 
 /*
@@ -210,6 +211,7 @@ typedef struct azio_stream {
   int      back;    /* one character push-back */
   int      last;    /* true if push-back is last character */
   unsigned char version;   /* Version */
+  unsigned char minor_version;   /* Version */
   unsigned int block_size;   /* Block Size */
   unsigned long long check_point;   /* Last position we checked */
   unsigned long long forced_flushes;   /* Forced Flushes */