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This updates archive to use new header information in az files and makes way for combining the meta data file with the AZ file.

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This commit is contained in:
brian@zim.(none) 2006-12-04 22:01:48 -08:00
parent 4eba36ee3b
commit f85acb894c
4 changed files with 134 additions and 94 deletions
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151
storage/archive/azio.c
View file

@ -18,6 +18,7 @@
#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 */
/* gzip flag byte */
#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
@ -66,6 +67,7 @@ int az_open (azio_stream *s, const char *path, int Flags, File fd)
s->crc = crc32(0L, Z_NULL, 0);
s->transparent = 0;
s->mode = 'r';
s->version = (unsigned char)az_magic[1]; /* this needs to be a define to version */
if (Flags & O_WRONLY || Flags & O_APPEND)
s->mode = 'w';
@ -112,20 +114,24 @@ int az_open (azio_stream *s, const char *path, int Flags, File fd)
return Z_NULL;
}
if (s->mode == 'w') {
char buffer[10];
/* Write a very simple .gz header:
*/
buffer[0] = gz_magic[0];
buffer[1] = gz_magic[1];
buffer[2] = Z_DEFLATED;
buffer[3] = 0 /*flags*/;
buffer[4] = 0;
buffer[5] = 0;
buffer[6] = 0;
buffer[7] = 0 /*time*/;
buffer[8] = 0 /*xflags*/;
buffer[9] = 0x03;
s->start = 10L;
char buffer[AZHEADER_SIZE];
char *ptr;
/* Write a very simple .gz header: */
bzero(buffer, AZHEADER_SIZE);
buffer[0] = az_magic[0];
buffer[1] = az_magic[1];
buffer[2] = (unsigned char)0; /* Reserved for block size */
buffer[3] = (unsigned char)0; /* Compression Type */
ptr= buffer + 4;
int4store(ptr, 0LL); /* FRM Block */
ptr+= sizeof(unsigned long);
int4store(ptr, 0LL); /* Meta Block */
ptr+= sizeof(unsigned long);
int4store(ptr, (unsigned long)AZHEADER_SIZE); /* Start of Data Block Index Block */
ptr+= sizeof(unsigned long);
s->start = AZHEADER_SIZE;
s->version = (unsigned char)az_magic[1];
my_write(s->file, buffer, (uint)s->start, MYF(0));
/* We use 10L instead of ftell(s->file) to because ftell causes an
* fflush on some systems. This version of the library doesn't use
@ -218,41 +224,53 @@ void check_header(azio_stream *s)
}
/* Peek ahead to check the gzip magic header */
if (s->stream.next_in[0] != gz_magic[0] ||
s->stream.next_in[1] != gz_magic[1]) {
if ( s->stream.next_in[0] == gz_magic[0] && s->stream.next_in[1] == gz_magic[1])
{
s->stream.avail_in -= 2;
s->stream.next_in += 2;
s->version= (unsigned char)2;
/* Check the rest of the gzip header */
method = get_byte(s);
flags = get_byte(s);
if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
s->z_err = Z_DATA_ERROR;
return;
}
/* Discard time, xflags and OS code: */
for (len = 0; len < 6; len++) (void)get_byte(s);
if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
len = (uInt)get_byte(s);
len += ((uInt)get_byte(s))<<8;
/* len is garbage if EOF but the loop below will quit anyway */
while (len-- != 0 && get_byte(s) != EOF) ;
}
if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
while ((c = get_byte(s)) != 0 && c != EOF) ;
}
if ((flags & COMMENT) != 0) { /* skip the .gz file comment */
while ((c = get_byte(s)) != 0 && c != EOF) ;
}
if ((flags & HEAD_CRC) != 0) { /* skip the header crc */
for (len = 0; len < 2; len++) (void)get_byte(s);
}
s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
}
else if ( s->stream.next_in[0] == az_magic[0] && s->stream.next_in[1] == az_magic[1])
{
s->stream.avail_in -= 2;
s->stream.next_in += 2;
for (len = 0; len < (AZHEADER_SIZE-2); len++) (void)get_byte(s);
s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
}
else
{
s->transparent = 1;
s->version = (unsigned char)0;
return;
}
s->stream.avail_in -= 2;
s->stream.next_in += 2;
/* Check the rest of the gzip header */
method = get_byte(s);
flags = get_byte(s);
if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
s->z_err = Z_DATA_ERROR;
return;
}
/* Discard time, xflags and OS code: */
for (len = 0; len < 6; len++) (void)get_byte(s);
if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
len = (uInt)get_byte(s);
len += ((uInt)get_byte(s))<<8;
/* len is garbage if EOF but the loop below will quit anyway */
while (len-- != 0 && get_byte(s) != EOF) ;
}
if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
while ((c = get_byte(s)) != 0 && c != EOF) ;
}
if ((flags & COMMENT) != 0) { /* skip the .gz file comment */
while ((c = get_byte(s)) != 0 && c != EOF) ;
}
if ((flags & HEAD_CRC) != 0) { /* skip the header crc */
for (len = 0; len < 2; len++) (void)get_byte(s);
}
s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
}
/* ===========================================================================
@ -668,10 +686,12 @@ int azclose (azio_stream *s)
if (s == NULL) return Z_STREAM_ERROR;
if (s->mode == 'w') {
#ifdef NO_GZCOMPRESS
return Z_STREAM_ERROR;
#else
if (do_flush (s, Z_FINISH) != Z_OK)
return destroy(s);
@ -681,3 +701,42 @@ int azclose (azio_stream *s)
}
return destroy(s);
}
/*
This function reads the header of meta block and returns whether or not it was successful.
*rows will contain the current number of rows in the data file upon success.
*/
int az_read_meta_block(char *meta_start, unsigned long *rows,
unsigned long long *auto_increment,
unsigned long long *forced_flushes)
{
unsigned char *ptr= meta_start;
ulonglong check_point;
DBUG_ENTER("ha_archive::read_meta_file");
/*
Parse out the meta data, we ignore version at the moment
*/
*rows= (unsigned long long)uint8korr(ptr);
ptr+= sizeof(unsigned long long); // Move past rows
check_point= uint8korr(ptr);
ptr+= sizeof(unsigned long long); // Move past check_point
*auto_increment= uint8korr(ptr);
ptr+= sizeof(unsigned long long); // Move past auto_increment
*forced_flushes= uint8korr(ptr);
ptr+= sizeof(unsigned long long); // Move past forced_flush
DBUG_PRINT("ha_archive::read_meta_file", ("Rows %llu",
(long long unsigned)*rows));
DBUG_PRINT("ha_archive::read_meta_file", ("Checkpoint %llu",
(long long unsigned) check_point));
DBUG_PRINT("ha_archive::read_meta_file", ("Auto-Increment %llu",
(long long unsigned)*auto_increment));
DBUG_PRINT("ha_archive::read_meta_file", ("Forced Flushes %llu",
(long long unsigned)*forced_flushes));
DBUG_PRINT("ha_archive::read_meta_file", ("Dirty %d", (int)(*ptr)));
DBUG_RETURN(0);
}

13
storage/archive/azlib.h
View file

@ -1,6 +1,8 @@
/*
This libary has been modified for use by the MySQL Archive Engine.
-Brian Aker
*/
/* zlib.h -- interface of the 'zlib' general purpose compression library
version 1.2.3, July 18th, 2005
@ -38,6 +40,16 @@
#ifdef __cplusplus
extern "C" {
#endif
/* Start of MySQL Specific Information */
/*
ulonglong + ulonglong + ulonglong + ulonglong + uchar
*/
#define AZMETA_BUFFER_SIZE sizeof(ulonglong) \
+ sizeof(ulonglong) + sizeof(ulonglong) + sizeof(ulonglong) \
+ sizeof(uchar)
#define AZHEADER_SIZE 16
/*
The 'zlib' compression library provides in-memory compression and
@ -171,6 +183,7 @@ typedef struct azio_stream {
my_off_t out; /* bytes out of deflate or inflate */
int back; /* one character push-back */
int last; /* true if push-back is last character */
unsigned char version; /* Version */
} azio_stream;
/* basic functions */

62
storage/archive/ha_archive.cc
View file

@ -250,11 +250,17 @@ int ha_archive::read_data_header(azio_stream *file_to_read)
if (azrewind(file_to_read) == -1)
DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
if (file_to_read->version >= 3)
DBUG_RETURN(0);
/* Everything below this is just legacy to version 2< */
DBUG_PRINT("ha_archive", ("Reading legacy data header"));
ret= azread(file_to_read, data_buffer, DATA_BUFFER_SIZE, &error);
if (ret != DATA_BUFFER_SIZE)
{
DBUG_PRINT("ha_archive", ("Reading, expected %lu got %lu",
DBUG_PRINT("ha_archive", ("Reading, expected %d got %lu",
DATA_BUFFER_SIZE, ret));
DBUG_RETURN(1);
}
@ -268,9 +274,6 @@ int ha_archive::read_data_header(azio_stream *file_to_read)
DBUG_PRINT("ha_archive", ("Check %u", data_buffer[0]));
DBUG_PRINT("ha_archive", ("Version %u", data_buffer[1]));
share->data_version= (uchar)data_buffer[1];
DBUG_PRINT("ha_archive", ("Set Version %u", share->data_version));
if ((data_buffer[0] != (uchar)ARCHIVE_CHECK_HEADER) &&
(data_buffer[1] != (uchar)ARCHIVE_VERSION))
DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
@ -278,29 +281,6 @@ int ha_archive::read_data_header(azio_stream *file_to_read)
DBUG_RETURN(0);
}
/*
This method writes out the header of a datafile and returns whether or not it was successful.
*/
int ha_archive::write_data_header(azio_stream *file_to_write)
{
uchar data_buffer[DATA_BUFFER_SIZE];
DBUG_ENTER("ha_archive::write_data_header");
data_buffer[0]= (uchar)ARCHIVE_CHECK_HEADER;
data_buffer[1]= (uchar)ARCHIVE_VERSION;
if (azwrite(file_to_write, &data_buffer, DATA_BUFFER_SIZE) !=
DATA_BUFFER_SIZE)
goto error;
DBUG_PRINT("ha_archive", ("Check %u", (uint)data_buffer[0]));
DBUG_PRINT("ha_archive", ("Version %u", (uint)data_buffer[1]));
DBUG_RETURN(0);
error:
DBUG_PRINT("ha_archive", ("Could not write full data header"));
DBUG_RETURN(errno);
}
/*
This method reads the header of a meta file and returns whether or not it was successful.
*rows will contain the current number of rows in the data file upon success.
@ -616,6 +596,9 @@ int ha_archive::open(const char *name, int mode, uint open_options)
DBUG_RETURN(rc);
}
DBUG_ASSERT(share);
record_buffer= create_record_buffer(table->s->reclength);
if (!record_buffer)
@ -694,6 +677,7 @@ int ha_archive::create(const char *name, TABLE *table_arg,
File create_file; // We use to create the datafile and the metafile
char name_buff[FN_REFLEN];
int error;
azio_stream create_stream; /* Archive file we are working with */
DBUG_ENTER("ha_archive::create");
stats.auto_increment_value= (create_info->auto_increment_value ?
@ -762,18 +746,13 @@ int ha_archive::create(const char *name, TABLE *table_arg,
goto error;
}
}
if (!azdopen(&archive, create_file, O_WRONLY|O_BINARY))
if (!azdopen(&create_stream, create_file, O_WRONLY|O_BINARY))
{
error= errno;
goto error2;
}
if (write_data_header(&archive))
{
error= errno;
goto error3;
}
if (azclose(&archive))
if (azclose(&create_stream))
{
error= errno;
goto error2;
@ -781,9 +760,6 @@ int ha_archive::create(const char *name, TABLE *table_arg,
DBUG_RETURN(0);
error3:
/* We already have an error, so ignore results of azclose. */
(void)azclose(&archive);
error2:
my_close(create_file, MYF(0));
delete_table(name);
@ -1140,8 +1116,9 @@ int ha_archive::get_row(azio_stream *file_to_read, byte *buf)
int rc;
DBUG_ENTER("ha_archive::get_row");
DBUG_PRINT("ha_archive", ("Picking version for get_row() %d -> %d",
share->data_version, ARCHIVE_VERSION));
if (share->data_version == ARCHIVE_VERSION)
(uchar)file_to_read->version,
ARCHIVE_VERSION));
if (file_to_read->version == ARCHIVE_VERSION)
rc= get_row_version3(file_to_read, buf);
else
rc= get_row_version2(file_to_read, buf);
@ -1436,13 +1413,6 @@ int ha_archive::optimize(THD* thd, HA_CHECK_OPT* check_opt)
start of the file.
*/
rc= read_data_header(&archive);
/*
Assuming now error from rewinding the archive file, we now write out the
new header for out data file.
*/
if (!rc)
rc= write_data_header(&writer);
/*
On success of writing out the new header, we now fetch each row and

2
storage/archive/ha_archive.h
View file

@ -50,7 +50,6 @@ typedef struct st_archive_share {
ulonglong mean_rec_length;
char real_path[FN_REFLEN];
uint meta_version;
uint data_version;
} ARCHIVE_SHARE;
/*
@ -137,7 +136,6 @@ public:
int init_archive_writer();
bool auto_repair() const { return 1; } // For the moment we just do this
int read_data_header(azio_stream *file_to_read);
int write_data_header(azio_stream *file_to_write);
void position(const byte *record);
int info(uint);
void update_create_info(HA_CREATE_INFO *create_info);