145 lines
3.2 KiB
C++
145 lines
3.2 KiB
C++
// NOTE: For unknown reason functions in this module use __stdcall instead
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// of regular __usercall.
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#include "file_utils.h"
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#include <stdbool.h>
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#include <stdio.h>
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#include <zlib.h>
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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// 0x452740
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int fileCopyDecompressed(const char* existingFilePath, const char* newFilePath)
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{
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FILE* stream = fopen(existingFilePath, "rb");
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if (stream == NULL) {
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return -1;
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}
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int magic[2];
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magic[0] = fgetc(stream);
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magic[1] = fgetc(stream);
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fclose(stream);
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if (magic[0] == 0x1F && magic[1] == 0x8B) {
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gzFile inStream = gzopen(existingFilePath, "rb");
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FILE* outStream = fopen(newFilePath, "wb");
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if (inStream != NULL && outStream != NULL) {
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for (;;) {
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int ch = gzgetc(inStream);
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if (ch == -1) {
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break;
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}
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fputc(ch, outStream);
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}
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gzclose(inStream);
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fclose(outStream);
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} else {
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if (inStream != NULL) {
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gzclose(inStream);
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}
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if (outStream != NULL) {
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fclose(outStream);
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}
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return -1;
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}
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} else {
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CopyFileA(existingFilePath, newFilePath, FALSE);
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}
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return 0;
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}
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// 0x452804
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int fileCopyCompressed(const char* existingFilePath, const char* newFilePath)
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{
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FILE* inStream = fopen(existingFilePath, "rb");
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if (inStream == NULL) {
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return -1;
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}
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int magic[2];
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magic[0] = fgetc(inStream);
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magic[1] = fgetc(inStream);
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rewind(inStream);
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if (magic[0] == 0x1F && magic[1] == 0x8B) {
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// Source file is already gzipped, there is no need to do anything
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// besides copying.
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fclose(inStream);
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CopyFileA(existingFilePath, newFilePath, FALSE);
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} else {
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gzFile outStream = gzopen(newFilePath, "wb");
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if (outStream == NULL) {
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fclose(inStream);
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return -1;
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}
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// Copy byte-by-byte.
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for (;;) {
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int ch = fgetc(inStream);
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if (ch == -1) {
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break;
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}
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gzputc(outStream, ch);
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}
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fclose(inStream);
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gzclose(outStream);
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}
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return 0;
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}
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// TODO: Check, implementation looks odd.
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int _gzdecompress_file(const char* existingFilePath, const char* newFilePath)
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{
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FILE* stream = fopen(existingFilePath, "rb");
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if (stream == NULL) {
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return -1;
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}
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int magic[2];
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magic[0] = fgetc(stream);
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magic[1] = fgetc(stream);
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fclose(stream);
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// TODO: Is it broken?
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if (magic[0] != 0x1F || magic[1] != 0x8B) {
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gzFile gzstream = gzopen(existingFilePath, "rb");
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if (gzstream == NULL) {
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return -1;
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}
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stream = fopen(newFilePath, "wb");
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if (stream == NULL) {
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gzclose(gzstream);
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return -1;
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}
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while (1) {
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int ch = gzgetc(gzstream);
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if (ch == -1) {
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break;
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}
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fputc(ch, stream);
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}
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gzclose(gzstream);
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fclose(stream);
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} else {
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CopyFileA(existingFilePath, newFilePath, FALSE);
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}
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return 0;
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}
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