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fix bug where current chain length was not calculated all the time

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This commit is contained in:
Josh Coalson
2002-06-15 05:09:47 +00:00
parent e43c51df8a
commit 3ecb1175a9
1 changed files with 34 additions and 24 deletions
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58
src/libFLAC/metadata_iterators.c
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@@ -709,11 +709,10 @@ struct FLAC__Metadata_Chain {
long first_offset, last_offset; /*@@@ 2G limit */
/*
* This is the length of the chain initially read from the FLAC file.
* it is used to compare against the current_length to decide whether
* it is used to compare against the current length to decide whether
* or not the whole file has to be rewritten.
*/
unsigned initial_length; /*@@@ 4G limit */
unsigned current_length; /*@@@ 4G limit */
};
struct FLAC__Metadata_Iterator {
@@ -774,7 +773,6 @@ static void chain_append_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node
}
chain->tail = node;
chain->nodes++;
chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
}
static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
@@ -796,7 +794,6 @@ static void chain_remove_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node
chain->tail->data->is_last = true;
chain->nodes--;
chain->current_length -= (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
}
static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node *node)
@@ -805,6 +802,15 @@ static void chain_delete_node_(FLAC__Metadata_Chain *chain, FLAC__Metadata_Node
node_delete_(node);
}
static unsigned chain_calculate_length_(FLAC__Metadata_Chain *chain)
{
const FLAC__Metadata_Node *node;
unsigned length = 0;
for(node = chain->head; node; node = node->next)
length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
return length;
}
static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
{
FLAC__ASSERT(0 != node);
@@ -828,7 +834,6 @@ static void iterator_insert_node_(FLAC__Metadata_Iterator *iterator, FLAC__Metad
iterator->current->prev = node;
iterator->chain->nodes++;
iterator->chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
}
static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC__Metadata_Node *node)
@@ -856,7 +861,6 @@ static void iterator_insert_node_after_(FLAC__Metadata_Iterator *iterator, FLAC_
iterator->chain->tail->data->is_last = true;
iterator->chain->nodes++;
iterator->chain->current_length += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);
}
/* return true iff node and node->next are both padding */
@@ -865,7 +869,6 @@ static FLAC__bool chain_merge_adjacent_padding_(FLAC__Metadata_Chain *chain, FLA
if(node->data->type == FLAC__METADATA_TYPE_PADDING && 0 != node->next && node->next->data->type == FLAC__METADATA_TYPE_PADDING) {
const unsigned growth = FLAC__STREAM_METADATA_HEADER_LENGTH + node->next->data->length;
node->data->length += growth;
chain->current_length += growth;
chain_delete_node_(chain, node->next);
return true;
@@ -883,7 +886,7 @@ FLAC__Metadata_Chain *FLAC__metadata_chain_new()
chain->head = chain->tail = 0;
chain->nodes = 0;
chain->status = FLAC__METADATA_CHAIN_STATUS_OK;
chain->initial_length = chain->current_length = 0;
chain->initial_length = 0;
}
return chain;
@@ -966,7 +969,7 @@ FLAC__bool FLAC__metadata_chain_read(FLAC__Metadata_Chain *chain, const char *fi
chain->last_offset = ftell(iterator->file) + iterator->length;
FLAC__metadata_simple_iterator_delete(iterator);
chain->initial_length = chain->current_length;
chain->initial_length = chain_calculate_length_(chain);
return true;
}
@@ -974,22 +977,27 @@ FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool us
{
struct stat stats;
const char *tempfile_path_prefix = 0;
unsigned current_length;
FLAC__ASSERT(0 != chain);
current_length = chain_calculate_length_(chain);
if(use_padding) {
if(chain->current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
const unsigned delta = chain->initial_length - chain->current_length;
if(current_length < chain->initial_length && chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
const unsigned delta = chain->initial_length - current_length;
chain->tail->data->length += delta;
chain->current_length += delta;
FLAC__ASSERT(chain->current_length == chain->initial_length);
current_length += delta;
FLAC__ASSERT(current_length == chain->initial_length);
}
else if(chain->current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
else if(current_length + FLAC__STREAM_METADATA_HEADER_LENGTH <= chain->initial_length) {
FLAC__StreamMetadata *padding;
FLAC__Metadata_Node *node;
if(0 == (padding = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING))) {
chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
return false;
}
padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + chain->current_length);
padding->length = chain->initial_length - (FLAC__STREAM_METADATA_HEADER_LENGTH + current_length);
if(0 == (node = node_new_())) {
FLAC__metadata_object_delete(padding);
chain->status = FLAC__METADATA_CHAIN_STATUS_MEMORY_ALLOCATION_ERROR;
@@ -997,19 +1005,21 @@ FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool us
}
node->data = padding;
chain_append_node_(chain, node);
FLAC__ASSERT(chain->current_length == chain->initial_length);
current_length = chain_calculate_length_(chain);
FLAC__ASSERT(current_length == chain->initial_length);
}
else if(chain->current_length > chain->initial_length) {
const unsigned delta = chain->current_length - chain->initial_length;
else if(current_length > chain->initial_length) {
const unsigned delta = current_length - chain->initial_length;
if(chain->tail->data->type == FLAC__METADATA_TYPE_PADDING) {
if(chain->tail->data->length + FLAC__STREAM_METADATA_HEADER_LENGTH == delta) {
chain_delete_node_(chain, chain->tail);
FLAC__ASSERT(chain->current_length == chain->initial_length);
current_length = chain_calculate_length_(chain);
FLAC__ASSERT(current_length == chain->initial_length);
}
else if(chain->tail->data->length >= delta) {
chain->tail->data->length -= delta;
chain->current_length -= delta;
FLAC__ASSERT(chain->current_length == chain->initial_length);
current_length -= delta;
FLAC__ASSERT(current_length == chain->initial_length);
}
}
}
@@ -1018,7 +1028,7 @@ FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool us
if(preserve_file_stats)
get_file_stats_(chain->filename, &stats);
if(chain->current_length == chain->initial_length) {
if(current_length == chain->initial_length) {
if(!chain_rewrite_chain_(chain))
return false;
}
@@ -1031,9 +1041,9 @@ FLAC__bool FLAC__metadata_chain_write(FLAC__Metadata_Chain *chain, FLAC__bool us
set_file_stats_(chain->filename, &stats);
/* recompute lengths and offsets if necessary */
if(chain->initial_length != chain->current_length) {
if(chain->initial_length != current_length) {
const FLAC__Metadata_Node *node;
chain->initial_length = chain->current_length;
chain->initial_length = current_length;
chain->last_offset = chain->first_offset;
for(node = chain->head; node; node = node->next)
chain->last_offset += (FLAC__STREAM_METADATA_HEADER_LENGTH + node->data->length);