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sk1

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This commit is contained in:
Bohdan Kapliuk 2025-01-12 16:13:30 +02:00
parent 6c4d7d0fef
commit f191d7b7b4
1 changed files with 19 additions and 5 deletions
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24
sk1/compressor.c
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@ -88,7 +88,7 @@ unsigned char* decompress_1_buffer(const unsigned char* data, size_t size, size_
int decompress_1(const char* input_file_name, const char* output_file_name) {
size_t size;
unsigned char* data;
if (read_file(input_file_name, &data, &size) != 0) return -1;
if (read_file(output_file_name, &data, &size) != 0) return -1;
size_t out_size;
unsigned char* decompressed = decompress_1_buffer(data, size, &out_size);
@ -96,7 +96,7 @@ int decompress_1(const char* input_file_name, const char* output_file_name) {
free(data);
return -1;
}
int result = write_file(output_file_name, decompressed, out_size);
int result = write_file(input_file_name, decompressed, out_size);
free(data);
free(decompressed);
return result == 0 ? (int)out_size : -1;
@ -109,17 +109,21 @@ int compress_2(const char* input_file_name, const char* output_file_name) {
if (read_file(input_file_name, &data, &size) != 0) {
return -1;
}
FILE* output = fopen(output_file_name, "w");
if (!output) {
free(data);
return -1;
}
unsigned char* dictionary[MAX_DICT_SIZE] = { NULL };
size_t dict_size = 0;
size_t current_index = 0;
while (current_index < size) {
size_t match_index = 0;
size_t match_length = 0;
for (size_t i = 0; i < dict_size; i++) {
size_t len = 0;
while (data[current_index + len] != '\0' &&
@ -132,9 +136,11 @@ int compress_2(const char* input_file_name, const char* output_file_name) {
match_index = i + 1;
}
}
if (current_index + match_length < size) {
fprintf(output, "%zu%c", match_index, data[current_index + match_length]);
}
if (dict_size < MAX_DICT_SIZE) {
dictionary[dict_size] = malloc(match_length + 2);
if (!dictionary[dict_size]) {
@ -152,6 +158,7 @@ int compress_2(const char* input_file_name, const char* output_file_name) {
dictionary[dict_size][match_length + 1] = '\0';
dict_size++;
}
current_index += match_length + 1;
}
@ -159,40 +166,47 @@ int compress_2(const char* input_file_name, const char* output_file_name) {
free(data);
for (size_t i = 0; i < dict_size; i++) {
free(dictionary[i]);
}
return 0;
}
int decompress_2(const char* input_file_name, const char* output_file_name) {
unsigned char* data;
size_t size;
if (read_file(input_file_name, &data, &size) != 0) {
if (read_file(output_file_name, &data, &size) != 0) {
return -1;
}
FILE* output = fopen(output_file_name, "w");
FILE* output = fopen(input_file_name, "w");
if (!output) {
free(data);
return -1;
}
unsigned char* dictionary[MAX_DICT_SIZE] = { NULL };
size_t dict_size = 0;
size_t current_index = 0;
while (current_index < size) {
unsigned short index = 0;
unsigned char ch = '\0';
while (current_index < size && isdigit(data[current_index])) {
index = index * 10 + (data[current_index] - '0');
current_index++;
}
if (current_index < size) {
ch = data[current_index++];
}
if (index == 0) {
fputc(ch, output);
} else {
fwrite(dictionary[index - 1], 1, strlen((char*)dictionary[index - 1]), output);
fputc(ch, output);
}
if (dict_size < MAX_DICT_SIZE) {
size_t length = (index > 0) ? strlen((char*)dictionary[index - 1]) : 0;
dictionary[dict_size] = malloc(length + 2);