#include "sgu_stdafx.h"
#include "sgu_mode_hash_file.h"

bool md5File(const char* szFileName, MD5Digest& result)
{
	if (!szFileName || szFileName[0]==0) {
		printf("Error: Input filename is not specified.\n");
		return false;
	}
	FILE* file = nullptr;
	fopen_s(&file, szFileName, "rb");
	if (!file) {
		printf("Error: Cannot open input file %s for reading.\n", szFileName);
		return false;
	}

	const size_t kBufferSize = 1024;
    size_t readSize = 0;
    uint8_t* buffer = new uint8_t[kBufferSize];

    MD5Context ctx;
    md5Init(&ctx);

    while ((readSize = fread(buffer, 1, kBufferSize, file)) > 0) 
    {
        md5Update(&ctx, (uint8_t*)buffer, readSize);
    }
    result = md5Finalize(&ctx);
	fclose(file);
	
    delete[] buffer;
	return true;
}

bool sha256File(const char* szFileName, Sha256Digest& result)
{
	if (!szFileName || szFileName[0] == 0) {
		printf("Error: Input filename is not specified.\n");
		return false;
	}
	FILE* file = nullptr;
	fopen_s(&file, szFileName, "rb");
	if (!file) {
		printf("Error: Cannot open input file %s for reading.\n", szFileName);
		return false;
	}
	const size_t kBufferSize = 1024;
	size_t readSize = 0;
	uint8_t* buffer = new uint8_t[kBufferSize];
	Sha256Context ctx;
	sha256Initialise(&ctx);
	while ((readSize = fread(buffer, 1, kBufferSize, file)) > 0) 
	{
		sha256Update(&ctx, (uint8_t*)buffer, readSize);
	}
	sha256Finalise(&ctx, result);
	fclose(file);
	delete[] buffer;
	return true;
}

bool crc32File(const char* szFileName, uint32_t& result)
{
	if (!szFileName || szFileName[0] == 0) {
		printf("Error: Input filename is not specified.\n");
		return false;
	}
	FILE* file = nullptr;
	fopen_s(&file, szFileName, "rb");
	if (!file) {
		printf("Error: Cannot open input file %s for reading.\n", szFileName);
		return false;
	}
	const size_t kBufferSize = 1024;
	size_t readSize = 0;
	uint8_t* buffer = new uint8_t[kBufferSize];

	result = 0;
	while ((readSize = fread(buffer, 1, kBufferSize, file)) > 0)
	{
		result = crcMemory32(buffer, static_cast<uint32_t>(readSize), result);
	}

	fclose(file);
	delete[] buffer;
	return true;
}