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cleanup compression code

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This commit is contained in:
Justin Scofield
2022-07-27 19:30:00 -04:00
parent d18c88699d
commit c9e46d1ab8
1 changed files with 19 additions and 20 deletions
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39
src/app/rom.cc
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@@ -130,11 +130,6 @@ compression_piece* new_compression_piece(const char command,
return toret;
}
void free_compression_piece(compression_piece* piece) {
free(piece->argument);
free(piece);
}
void free_compression_chain(compression_piece* piece) {
while (piece != NULL) {
compression_piece* p = piece->next;
@@ -263,8 +258,6 @@ absl::StatusOr<Bytes> CompressOverworld(const uint pos, const uint length) {
// TODO TEST compressed data border for each cmd
absl::StatusOr<Bytes> ROM::Compress(const uint start, const uint length,
char mode) {
// we will realloc later
// char* compressed_data = (char*)malloc(length + 10);
Bytes compressed_data(length + 10);
// Worse case should be a copy of the string with extended header
compression_piece* compressed_chain = new_compression_piece(1, 1, "aaa", 2);
@@ -273,12 +266,12 @@ absl::StatusOr<Bytes> ROM::Compress(const uint start, const uint length,
unsigned int u_data_pos = start;
unsigned int last_pos = start + length - 1;
printf("max pos :%d\n", last_pos);
// unsigned int previous_start = start;
unsigned int data_size_taken[5] = {0, 0, 0, 0, 0};
unsigned int cmd_size[5] = {0, 1, 2, 1, 2};
char cmd_args[5][2] = {{0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}};
unsigned int bytes_since_last_compression =
0; // Used when skipping using copy
// Used when skipping using copy
unsigned int bytes_since_last_compression = 0;
while (1) {
memset(data_size_taken, 0, sizeof(data_size_taken));
@@ -360,6 +353,7 @@ absl::StatusOr<Bytes> ROM::Compress(const uint start, const uint length,
}
}
}
printf("Finding the best gain\n");
// We check if a command managed to pick up 2 or more bytes
// We don't want to be even with copy, since it's possible to merge copy
@@ -378,16 +372,17 @@ absl::StatusOr<Bytes> ROM::Compress(const uint start, const uint length,
max_win = cmd_size_taken;
}
}
if (cmd_with_max == kCommandDirectCopy) // This is the worse case
{
// This is the worse case
if (cmd_with_max == kCommandDirectCopy) {
printf("- Best command is copy\n");
// We just move through the next byte and don't 'compress' yet, maybe
// something is better after.
u_data_pos++;
bytes_since_last_compression++;
if (bytes_since_last_compression == 32 ||
u_data_pos > last_pos) // Arbitraty choice to do a 32 bytes grouping
{
// Arbitrary choice to do a 32 bytes grouping
if (bytes_since_last_compression == 32 || u_data_pos > last_pos) {
char buffer[32];
memcpy(buffer, u_data + u_data_pos - bytes_since_last_compression,
bytes_since_last_compression);
@@ -402,13 +397,15 @@ absl::StatusOr<Bytes> ROM::Compress(const uint start, const uint length,
printf("- Ok we get a gain from %d\n", cmd_with_max);
char buffer[2];
buffer[0] = cmd_args[cmd_with_max][0];
if (cmd_size[cmd_with_max] == 2) buffer[1] = cmd_args[cmd_with_max][1];
if (cmd_size[cmd_with_max] == 2)
buffer[1] = cmd_args[cmd_with_max][1];
compression_piece* new_comp_piece = new_compression_piece(
cmd_with_max, max_win, buffer, cmd_size[cmd_with_max]);
if (bytes_since_last_compression !=
0) // If we let non compressed stuff, we need to add a copy chuck
// before
{
// If we let non compressed stuff, we need to add a copy chuck before
if (bytes_since_last_compression != 0) {
char* copy_buff = (char*)malloc(bytes_since_last_compression);
memcpy(copy_buff, u_data + u_data_pos - bytes_since_last_compression,
bytes_since_last_compression);
@@ -418,11 +415,13 @@ absl::StatusOr<Bytes> ROM::Compress(const uint start, const uint length,
compressed_chain->next = copy_chuck;
compressed_chain = copy_chuck;
}
compressed_chain->next = new_comp_piece;
compressed_chain = new_comp_piece;
u_data_pos += max_win;
bytes_since_last_compression = 0;
}
if (u_data_pos > last_pos) break;
// Validate compression result