static int
seekChars(void* state, long offset, int whence) {
long absPos;
char* pszError;
switch (whence) {
case SEEK_SET:
absPos = offset;
storagePosition(&pszError, (int)state, absPos);
break;
case SEEK_END:
absPos = sizeOfFile(state) + offset;
storagePosition(&pszError, (int)state, absPos);
break;
case SEEK_CUR:
absPos = storageRelativePosition(&pszError, (int)state, offset);
break;
default:
return -1;
}
storageFreeError(pszError);
return absPos;
}
/**
* Store content handler information into a registry.
*
* @param handler description of a registering handler. Implementation MUST NOT
* retain pointed object
* @return JSR211_OK if content handler registered successfully
*/
jsr211_result jsr211_register_handler(const JSR211_content_handler* handler) {
long current_position;
unsigned int record_size = sizeof(int);
if (open_table_file(1) != JSR211_OK) {
return JSR211_FAILED;
}
storagePosition(&io_error_message, table_file,
storageSizeOf(&io_error_message, table_file));
current_position = storageRelativePosition(&io_error_message, table_file, 0);
storageWrite(&io_error_message, table_file, (char *)&record_size,
sizeof(record_size)); /* Placeholder for record size */
record_size += write_string(&(handler->id));
record_size += write_int(handler->flag);
record_size += write_int(handler->suite_id);
record_size += write_string(&(handler->class_name));
record_size += write_string_array(handler->type_num, handler->types);
record_size += write_string_array(handler->suff_num, handler->suffixes);
record_size += write_string_array(handler->act_num, handler->actions);
record_size += write_string_array(handler->locale_num, handler->locales);
record_size += write_string_array(handler->locale_num * handler->act_num,
handler->action_map);
record_size += write_string_array(handler->access_num, handler->accesses);
storagePosition(&io_error_message, table_file, current_position);
storageWrite(&io_error_message, table_file, (char *)&record_size,
sizeof(record_size));
storageRelativePosition(&io_error_message, table_file, record_size -
sizeof(int));
close_table_file();
return JSR211_OK;
}
/**
* Searches the next content handler in the file by its suite id.
*
* @param suite search suite ID
* @return offset of found record or -1
*/
static long find_next_by_suite(int suite) {
long current_position;
int record_size;
int testSuite;
int found = 0;
current_position = storageRelativePosition(&io_error_message, table_file, 0);
do {
record_size = position_field(JSR211_CHR_SUITE);
if (record_size <= 0) {
current_position = -1;
break;
}
storageRead(&io_error_message, table_file, (char*)&testSuite, sizeof(int));
found = (testSuite == suite? 1: 0);
storagePosition(&io_error_message, table_file, current_position);
if (found) {
break;
}
current_position = storageRelativePosition(&io_error_message, table_file,
record_size);
} while (current_position > 0);
return current_position;
}
/**
* Loads current handler's main fields (ID, suite_ID, class_name, flag).
* @param handler loaded structure pointer.
* @return operation result
*/
static void load_current_handler(JSR211_CH* ch) {
long pos = storageRelativePosition(&io_error_message, table_file,
sizeof(int)) - sizeof(int);
read_string(&(ch->id));
storageRead(&io_error_message, table_file, (char*)&(ch->flag), sizeof(int));
storageRead(&io_error_message, table_file, (char*)&(ch->suite_id), sizeof(int));
read_string(&(ch->class_name));
storagePosition(&io_error_message, table_file, pos);
}
/* Directly write to storage. File position will be updated also. */
static
void uncachedWrite(char** ppszError, int handle, char *buffer, int length) {
*ppszError = NULL;
storagePosition(ppszError, handle, mFileCache->cachedPosition);
if (*ppszError == NULL) {
storageWrite(ppszError, handle, buffer, length);
if (*ppszError == NULL) {
updateCachedSizes(length);
}
}
}
/**
* Flush the cache and stop current file caching.
* Seek cached position for the case the file won't be closed after
* flushing (it's possible if a few files are openned simultaneously).
*/
static void midp_file_cache_finalize(char **ppszError, int stayOpen) {
*ppszError = NULL;
if (mFileCache != NULL) {
midp_file_cache_flush(ppszError, mFileCache->handle);
/* Do no seek for the file that is either damaged or to be closed */
if (*ppszError == NULL && stayOpen) {
storagePosition(ppszError, mFileCache->handle,
mFileCache->cachedPosition);
}
/* If read is cached, free all read blocks here */
midpFree(mFileCache);
mFileCache = NULL;
}
}
/**
* Searches the next content handler in the file by specified conditions.
*
* @param caller_id caller ID
* @param number number of key field
* @param key search key
* @param case_sensitive case sensivity flag
* @param cond comparision mode
* @return offset of found record or -1
*/
static long find_next_by_field(const pcsl_string* caller_id,
jsr211_field number, const pcsl_string* key,
jsr211_boolean case_sensitive, find_condition cond) {
long current_position;
int current_size, access;
int found = 0;
int chr = CHR_INDEX((int)(number)); // Content Handler Record index
int isString;
switch (record_struct[chr]) {
case field_string:
isString = 1;
break;
case field_array:
isString = 0;
break;
default:
return -1;
}
current_position = storageRelativePosition(&io_error_message, table_file, 0);
for (;;) {
/* check access */
access = check_access(caller_id, current_position, ¤t_size);
if (access == -1) {
return -1;
}
else if (access) {
position_field(chr);
found = (isString?
compare_string(key, case_sensitive, cond):
compare_array(key, case_sensitive, cond));
}
storagePosition(&io_error_message, table_file, current_position);
if (found) {
break;
}
current_position += current_size;
goto_next_record();
}
return current_position;
}
/**
* Deletes content handler information from a registry.
*
* @param handler_id content handler ID
* @return JSR211_OK if content handler unregistered successfully
*/
jsr211_result jsr211_unregister_handler(const pcsl_string* handler_id) {
long current_position, file_size, buffer_size;
int record_size;
char *buffer;
if (open_table_file(1) != JSR211_OK) {
return JSR211_FAILED;
}
if (find_next_by_field(NULL, JSR211_FIELD_ID, handler_id, JSR211_TRUE,
find_exact) == -1) {
close_table_file();
return JSR211_FAILED;
}
storageRead(&io_error_message, table_file, (char *)&record_size, sizeof(int));
current_position = storageRelativePosition(&io_error_message, table_file,
-(long)sizeof(int));
file_size = storageSizeOf(&io_error_message, table_file);
goto_next_record();
if (!(buffer = JSR211_MALLOC((buffer_size = file_size - current_position -
record_size)))) {
close_table_file();
return JSR211_FAILED;
}
storageRead(&io_error_message, table_file, buffer, buffer_size);
storagePosition(&io_error_message, table_file, current_position);
storageWrite(&io_error_message, table_file, buffer, buffer_size);
JSR211_FREE(buffer);
storageTruncate(&io_error_message, table_file, current_position +
buffer_size);
close_table_file();
return JSR211_OK;
}
/**
* Verifies access of caller for current content handler.
* Reads access restrictions from a current record and
* compares it with a passed caller_id.
*
* @param caller_id caller
* @param current_position current position of the file
* @param current_size [out] size of current record
* @return 1 if access is permitted
*/
static int check_access(const pcsl_string* caller_id, long current_position,
int* current_size) {
int access_len, access_ok;
if ((*current_size = position_field(JSR211_CHR_ACCESSES)) <= 0) {
return -1;
}
if (caller_id != NULL && pcsl_string_length(caller_id) > 0) {
storageRelativePosition(&io_error_message, table_file, sizeof(int));
storageRead(&io_error_message, table_file, (char*)&access_len, sizeof(int));
if (!access_len) {
access_ok = 1;
}
else {
storageRelativePosition(&io_error_message, table_file, -2 * (long)sizeof(int));
access_ok = compare_array(caller_id, JSR211_TRUE, find_first);
}
}
else {
access_ok = 1;
}
storagePosition(&io_error_message, table_file, current_position);
return access_ok;
}
/**
* Writes string array to the file.
*
* @param array_len length of array to be written
* @param array array to be written
* @return number of bytes written
*/
static int write_string_array(int array_len, const pcsl_string* array) {
long current_pos;
int write_count;
const pcsl_string *current_string, *end;
current_pos = storageRelativePosition(&io_error_message, table_file, 0);
/* array size placeholder */
storageWrite(&io_error_message, table_file, (char*)&write_count, sizeof(int));
/* array size saving */
storageWrite(&io_error_message, table_file, (char *)&array_len, sizeof(int));
write_count = sizeof(int);
for (current_string = array, end = array + array_len;
current_string < end;
current_string ++) {
write_count += write_string(current_string);
}
storagePosition(&io_error_message, table_file, current_pos);
storageWrite(&io_error_message, table_file, (char*)&write_count, sizeof(int));
storageRelativePosition(&io_error_message, table_file, write_count);
return write_count + sizeof(int);
}
/** A helper function for midp_file_cache_flush(). */
static
void midp_file_cache_flush_using_buffer(char** ppszError, int handle,
char* buf, long bufsize) {
MidpFileCacheBlock *b; /* current cache block */
MidpFileCacheBlock *n; /* next cache block */
MidpFileCacheBlock *q; /* first block not (yet) copied to the buffer,
finally, the value to be stored
in mFileCache->blocks */
char *bufPos; /* first not yet used byte in the write buffer */
long startPos, endPos; /* positions in the file cached in a series
of buffers, from...upto */
long len;
*ppszError = NULL;
while ((b = mFileCache->blocks) != NULL) {
if ( NULL != buf
&& NULL != (n = b->next)
&& n->position == b->position + b->length /* adjacent? */
&& b->length + n->length < bufsize
) { /* begin merging blocks */
/* position in the buffer */
bufPos = buf;
/* position in the file */
startPos = endPos = b->position;
b = mFileCache->blocks;
/* now copy a series of adjacent blocks to the write buffer */
do {
len = b->length;
memcpy(bufPos,DATA(b),len);
endPos += len;
bufPos += len;
b = b->next;
} while ( NULL != b
&& b->position == endPos
&& endPos - startPos + b->length < bufsize
);
q = b; /* q is next to the last copied block */
/* the cache state has not been modified yet */
/* now write from the write buffer */
storagePosition(ppszError, handle, startPos);
CHECK_ERROR(*ppszError);
storageWrite(ppszError, handle, buf, endPos-startPos);
CHECK_ERROR(*ppszError);
/* write successful, now free the cache blocks */
while ( q != (b = mFileCache->blocks)) {
mFileCache->size -= b->length + sizeof(MidpFileCacheBlock);
mFileCache->blocks = b->next;
midpFree(b);
}
} else {
storagePosition(ppszError, handle, b->position);
CHECK_ERROR(*ppszError);
storageWrite(ppszError, handle, DATA(b), b->length);
CHECK_ERROR(*ppszError);
mFileCache->size -= b->length + sizeof(MidpFileCacheBlock);
mFileCache->blocks = b->next;
midpFree(b);
}
}
storageCommitWrite(ppszError, handle);
CHECK_ERROR(*ppszError);
/* ASSERT (mFileCache->size == 0) */
if (mFileCache->size != 0) {
REPORT_ERROR(LC_RMS, "File cache out of sync");
}
}
/**
* Returns all found values for specified field. Tha allowed fields are: <ul>
* <li> JSR211_FIELD_ID, <li> JSR211_FIELD_TYPES, <li> JSR211_FIELD_SUFFIXES,
* <li> and JSR211_FIELD_ACTIONS. </ul>
* Values should be selected only from handlers accessible for given caller_id.
*
* @param caller_id calling application identifier.
* @param field search field id
* @param result output structure where result is placed to.
* <br>Use @link jsr211_fillStringArray function to fill this structure.
* @return status of the operation
*/
jsr211_result jsr211_get_all(const pcsl_string* caller_id, jsr211_field field,
/*OUT*/ JSR211_RESULT_STRARRAY* result) {
long current_position;
int found_num, access, current_size;
pcsl_string *res_buffer = NULL;
pcsl_string *current_result, *last;
int chr = CHR_INDEX((int)(field));
int isString;
switch (record_struct[chr]) {
case field_string:
isString = 1;
break;
case field_array:
isString = 0;
break;
default:
return JSR211_FAILED;
}
if (open_table_file(0) != JSR211_OK) {
return JSR211_FAILED;
}
res_buffer = alloc_pcsl_string_list(JSR211_MAX_RESULT_SET);
if (res_buffer == NULL) {
close_table_file();
return JSR211_FAILED;
}
current_position = 0;
for (current_result = res_buffer, last = res_buffer + JSR211_MAX_RESULT_SET;
current_result < last;) {
access = check_access(caller_id, current_position, ¤t_size);
if (access == -1) {
break;
}
if (access && position_field(chr) > 0) {
if (isString) {
read_string(current_result);
if (!findStringInArray(res_buffer, current_result - res_buffer,
current_result)) {
current_result++;
}
}
else {
pcsl_string *array_res = NULL, *results, *last_res;
int array_length = 0;
read_string_array(&array_length, &array_res);
if (array_length > 0) {
for (results = array_res, last_res = array_res + array_length;
results < last_res && current_result < last;
results++) {
if (!findStringInArray(res_buffer, current_result - res_buffer,
results)) {
*(current_result++) = *results;
*results = PCSL_STRING_NULL;
}
}
free_pcsl_string_list(array_res, array_length);
}
}
}
storagePosition(&io_error_message, table_file, current_position);
current_position += current_size;
goto_next_record();
}
if ((found_num = (int)(current_result - res_buffer))) {
jsr211_fillStringArray(res_buffer, found_num, result);
}
free_pcsl_string_list(res_buffer, JSR211_MAX_RESULT_SET);
close_table_file();
return JSR211_OK;
}