UndoStackItem *UndoStack::get_current_undo()
{
UndoStackItem *item = current;
- if( item && (number_of(item) % 2) ) item = item->previous;
- if( item && !(number_of(item) % 2) ) item = item->previous;
+ if( item && (number_of(item) & 1) ) item = item->previous;
+ if( item && !(number_of(item) & 1) ) item = item->previous;
return item;
}
UndoStackItem *UndoStack::get_current_redo()
{
UndoStackItem *item = current ? current : first;
- if( item && (number_of(item) % 2) ) item = item->next;
- if( item && !(number_of(item) % 2) ) item = item->next;
+ if( item && (number_of(item) & 1) ) item = item->next;
+ if( item && !(number_of(item) & 1) ) item = item->next;
return item;
}
UndoStackItem* UndoStack::push()
{
// current is only 0 if before first undo
- if(current)
+ if( current )
current = insert_after(current);
else
current = insert_before(first);
// delete future undos if necessary
- if(current && current->next)
- {
- while(current->next) remove(last);
+ if( current && current->next ) {
+ while( current->next ) remove(last);
}
// delete oldest 2 undos if necessary
- if(total() > UNDOLEVELS)
- {
- for(int i = 0; i < 2; i++)
- {
+ if( total() > UNDOLEVELS ) {
+ for( int i=0; i<2; ++i ) {
UndoStackItem *second = first->next;
char *temp_data = 0;
- if(!second->is_key())
- {
+ if( !second->is_key() ) {
temp_data = second->get_data();
}
remove(first);
// Convert new first to key buffer.
- if(!second->is_key())
- {
+ if( !second->is_key() ) {
second->set_data(temp_data);
}
delete [] temp_data;
UndoStackItem* UndoStack::pull_next()
{
// use first entry if none
- if(!current)
+ if( !current )
current = first;
else
// use next entry if there is a next entry
- if(current->next)
+ if( current->next )
current = NEXT;
// don't change current if there is no next entry
else
{
fprintf(fp,"UndoStack::dump\n");
UndoStackItem *current = last;
- int i = 0;
// Dump most recent
- while(current && i < 10)
- {
- fprintf(fp," %d %p %s %c\n",
- i++,
- current,
- current->get_description(),
- current == this->current ? '*' : ' ');
- current = PREVIOUS;
+ for( int i=0; current && i<16; ++i,current=PREVIOUS ) {
+ fprintf(fp," %d %p %s %04jx %c\n", i, current, current->get_description(),
+ current->get_flags(), current == this->current ? '*' : ' ');
+//char fn[BCSTRLEN]; sprintf(fn,"/tmp/undo%d", i); FILE *fp = fopen(fn,"w");
+//if( fp ) { char *cp=current->get_data(); fwrite(cp,strlen(cp),1,fp); fclose(fp); delete [] cp; }
}
}
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
// These difference routines are straight out of the Heroinediff/Heroinepatch
// utilities.
-
-
-
-
// We didn't want to use the diff program because that isn't efficient enough
// to compress EDL's. This program also handles binary data.
// for differences.
-
-
-
-
-
-
// Minimum size of transposed block.
// Smaller transpositions should be included in the same difference record.
#define MIN_TRANS 16
int new_size,
int old_size)
{
- if(new_size || old_size)
- {
+ if( new_size || old_size ) {
int record_size = new_size + 12;
unsigned char *new_result = new unsigned char[(*result_size) + record_size];
memcpy(new_result, (*result), (*result_size));
// Get last different bytes
unsigned char *last_difference_after = after + after_len - 1;
unsigned char *last_difference_before = before + before_len - 1;
- while(1)
- {
- if(last_difference_after < after ||
- last_difference_before < before) break;
- if(*last_difference_after != *last_difference_before)
- {
+ for(;;) {
+ if( last_difference_after < after ||
+ last_difference_before < before ) break;
+ if( *last_difference_after != *last_difference_before ) {
break;
}
last_difference_after--;
last_difference_after++;
last_difference_before++;
-
-
-
-
-
int done = 0;
unsigned char *before_ptr = before;
unsigned char *after_ptr = after;
unsigned char *after_end = after + after_len;
// Scan forward for first difference
- while(!done)
- {
- if(before_ptr < before_end &&
- after_ptr < after_end)
- {
+ while( !done ) {
+ if( before_ptr < before_end &&
+ after_ptr < after_end ) {
// Both characters equal
- if(*before_ptr == *after_ptr &&
+ if( *before_ptr == *after_ptr &&
before_ptr < last_difference_before &&
- after_ptr < last_difference_after)
- {
+ after_ptr < last_difference_after ) {
before_ptr++;
after_ptr++;
}
- else
+ else {
// Characters differ
- {
// Get length of difference.
unsigned char *before_difference_start = before_ptr;
unsigned char *after_difference_start = after_ptr;
- while(*before_ptr != *after_ptr &&
- before_ptr < last_difference_before &&
- after_ptr < last_difference_after)
- {
+ while( *before_ptr != *after_ptr &&
+ before_ptr < last_difference_before &&
+ after_ptr < last_difference_after ) {
before_ptr++;
after_ptr++;
}
// Finished comparing if either pointer hits its last difference
- if(before_ptr >= last_difference_before ||
- after_ptr >= last_difference_after)
- {
+ if( before_ptr >= last_difference_before ||
+ after_ptr >= last_difference_after ) {
done = 1;
before_ptr = last_difference_before;
after_ptr = last_difference_after;
}
-
-
int after_start = after_difference_start - after;
int before_start = before_difference_start - before;
int after_len = after_ptr - after_difference_start;
int before_len = before_ptr - before_difference_start;
- if(verbose)
- {
+ if( verbose ) {
char string[1024];
memcpy(string, after_difference_start, MIN(after_len, 40));
string[MIN(after_len, 40)] = 0;
printf("after_offset=0x%x before_offset=0x%x after_size=%d before_size=%d \"%s\"\n",
- after_start,
- before_start,
- after_len,
- before_len,
- string);
+ after_start, before_start, after_len, before_len, string);
}
-
// Create difference record
- append_record(&result,
- result_len,
- after_difference_start,
- after_start,
- after_len,
- before_len);
+ append_record(&result, result_len, after_difference_start,
+ after_start, after_len, before_len);
}
}
else
return result;
}
-
-
-
-
-
-
-
-
-static void get_record(unsigned char **patch_ptr,
- unsigned char *patch_end,
- unsigned char **after_data,
- int *after_offset,
- int *after_size,
- int *before_size)
+static void get_record(unsigned char **patch_ptr, unsigned char *patch_end,
+ unsigned char **after_data, int *after_offset, int *after_size, int *before_size)
{
(*after_data) = 0;
- if((*patch_ptr) < patch_end)
- {
- (*after_offset) = *(int32_t*)(*patch_ptr);
- (*patch_ptr) += 4;
- (*after_size) = *(int32_t*)(*patch_ptr);
- (*patch_ptr) += 4;
- (*before_size) = *(int32_t*)(*patch_ptr);
- (*patch_ptr) += 4;
-
- (*after_data) = (*patch_ptr);
- (*patch_ptr) += (*after_size);
+ if( (*patch_ptr) < patch_end ) {
+ (*after_offset) = *(int32_t*)(*patch_ptr); (*patch_ptr) += 4;
+ (*after_size) = *(int32_t*)(*patch_ptr); (*patch_ptr) += 4;
+ (*before_size) = *(int32_t*)(*patch_ptr); (*patch_ptr) += 4;
+ (*after_data) = (*patch_ptr); (*patch_ptr) += (*after_size);
}
}
-
-
-
-static unsigned char* apply_difference(unsigned char *before,
- int before_len,
- unsigned char *patch,
- int patch_len,
- int *result_len)
+static unsigned char* apply_difference(unsigned char *before, int before_len,
+ unsigned char *patch, int patch_len, int *result_len)
{
unsigned char *patch_ptr = patch;
*result_len = *(int32_t*)patch_ptr;
unsigned char *before_ptr = before;
int done = 0;
- while(!done)
- {
+ while( !done ) {
unsigned char *after_data;
- int after_offset;
- int after_size;
- int before_size;
-
- get_record(&patch_ptr,
- patch_end,
- &after_data,
- &after_offset,
- &after_size,
- &before_size);
-
- if(after_data)
- {
+ int after_offset, after_size, before_size;
+
+ get_record(&patch_ptr, patch_end,
+ &after_data, &after_offset, &after_size, &before_size);
+
+ if( after_data ) {
int result_offset = result_ptr - result;
- if(after_offset > result_offset)
- {
+ if( after_offset > result_offset ) {
int skip_size = after_offset - result_offset;
memcpy(result_ptr, before_ptr, skip_size);
result_ptr += skip_size;
result_ptr += after_size;
before_ptr += before_size;
}
- else
- {
+ else {
// All data from before_ptr to end of result buffer is identical
- if(result_end - result_ptr > 0)
+ if( result_end - result_ptr > 0 )
memcpy(result_ptr, before_ptr, result_end - result_ptr);
done = 1;
}
const char* UndoStackItem::get_description()
{
- if(description)
+ if( description )
return description;
else
return "";
int need_key = 1;
UndoStackItem *current = this;
this->key = 0;
- for(int i = 0; i < UNDO_KEY_INTERVAL && current; i++)
- {
- if(current->key && current->has_data())
- {
+ for( int i=0; i<UNDO_KEY_INTERVAL && current; ++i ) {
+ if( current->key && current->has_data() ) {
need_key = 0;
break;
}
int new_size = strlen(data) + 1;
- if(!need_key)
- {
+ if( !need_key ) {
// Reconstruct previous data for difference
char *prev_buffer = previous->get_data();
int prev_size = prev_buffer ? strlen(prev_buffer) + 1 : 0;
// Diff was bigger than original.
// Happens if a lot of tiny changes happened and the record headers
// took more space than the changes.
- if(this->data_size > new_size)
- {
+ if( this->data_size > new_size ) {
delete [] this->data;
this->data_size = 0;
need_key = 1;
}
- else
- {
+ else {
// Reconstruct current data from difference
int test_size;
char *test_buffer = (char*)apply_difference((unsigned char*)prev_buffer,
(unsigned char*)this->data,
this->data_size,
&test_size);
- if(test_size != new_size ||
- memcmp(test_buffer, data, test_size))
- {
+ if( test_size != new_size ||
+ memcmp(test_buffer, data, test_size) ) {
// FILE *test1 = fopen("/tmp/undo1", "w");
// fwrite(prev_buffer, prev_size, 1, test1);
// fclose(test1);
delete [] prev_buffer;
}
- if(need_key)
- {
+ if( need_key ) {
this->key = 1;
this->data_size = new_size;
this->data = new char[this->data_size];
return;
}
-
-
char* UndoStackItem::get_incremental_data()
{
return data;
{
// Find latest key buffer
UndoStackItem *current = this;
- while(current && !current->key)
+ while( current && !current->key )
current = PREVIOUS;
- if(!current)
- {
+ if( !current ) {
printf("UndoStackItem::get_data: no key buffer found!\n");
return 0;
}
// This is the key buffer
- if(current == this)
- {
+ if( current == this ) {
char *result = new char[data_size];
memcpy(result, data, data_size);
return result;
char *current_data = current->get_data();
int current_size = current->get_size();
current = NEXT;
- while(current)
- {
+ while( current ) {
// Do incremental updates
int new_size;
- char *new_data = (char*)apply_difference((unsigned char*)current_data,
- current_size,
+ char *new_data = (char*)apply_difference((unsigned char*)current_data, current_size,
(unsigned char*)current->get_incremental_data(),
- current->get_incremental_size(),
- &new_size);
+ current->get_incremental_size(), &new_size);
delete [] current_data;
- if(current == this)
+ if( current == this )
return new_data;
- else
- {
+ else {
current_data = new_data;
current_size = new_size;
current = NEXT;
return 0;
}
-
-
-
int UndoStackItem::is_key()
{
return key;
return creator;
}
-
-
-
-
-
-
projects / goodguy / history.git / commitdiff