CStdFile.cpp File Reference

#include "C4Include.h"
#include "c4group/CStdFile.h"
#include "lib/SHA1.h"
#include <zlib.h>
#include "zlib/gzio.h"
#include <sys/stat.h>

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Functions
int	UncompressedFileSize (const char *szFilename)
bool	GetFileCRC (const char *szFilename, uint32_t *pCRC32)
bool	GetFileSHA1 (const char *szFilename, BYTE *pSHA1)

Function Documentation

GetFileCRC()

bool GetFileCRC	(	const char *	szFilename,
		uint32_t *	pCRC32
	)

Definition at line 355 of file CStdFile.cpp.

{
    if (!pCRC32) return false;
    // open file
    CStdFile File;
    if (!File.Open(szFilename))
        return false;
    // calculcate CRC
    uint32_t iCRC32 = 0;
    for (;;)
    {
        // read a chunk of data
        BYTE szData[CStdFileBufSize]; size_t iSize = 0;
        if (!File.Read(szData, CStdFileBufSize, &iSize))
            if (!iSize)
                break;
        // update CRC
        iCRC32 = crc32(iCRC32, szData, iSize);
    }
    // close file
    File.Close();
    // okay
    *pCRC32 = iCRC32;
    return true;
}

References CStdFile::Close(), CStdFileBufSize, iSize, CStdFile::Open(), and CStdFile::Read().

Referenced by C4UpdatePackage::Check(), DisplayGroup(), C4UpdatePackage::Execute(), C4Network2Res::GetStandalone(), C4UpdatePackage::MakeUpdate(), and C4Network2Res::SetByFile().

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GetFileSHA1()

bool GetFileSHA1	(	const char *	szFilename,
		BYTE *	pSHA1
	)

Definition at line 381 of file CStdFile.cpp.

{
    if (!pSHA1) return false;
    // open file
    CStdFile File;
    if (!File.Open(szFilename))
        return false;
    // calculcate CRC
    sha1 ctx;
    for (;;)
    {
        // read a chunk of data
        BYTE szData[CStdFileBufSize]; size_t iSize = 0;
        if (!File.Read(szData, CStdFileBufSize, &iSize))
            if (!iSize)
                break;
        // update CRC
        ctx.process_bytes(szData, iSize);
    }
    // close file
    File.Close();
    // finish calculation
    ctx.get_digest((sha1::digest_type) *pSHA1);
    return true;
}

References CStdFile::Close(), CStdFileBufSize, sha1::get_digest(), iSize, CStdFile::Open(), sha1::process_bytes(), and CStdFile::Read().

Referenced by C4Network2Res::CalculateSHA(), C4StartupModsDownloader::ModInfo::LocalDiscoveryCheck::Execute(), and C4Record::Stop().

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UncompressedFileSize()

int UncompressedFileSize

(

const char *

szFilename

)

Definition at line 322 of file CStdFile.cpp.

{
    int rd,rval=0;
    BYTE buf[1024];
    int flags = _O_BINARY|O_CLOEXEC|O_RDONLY;
#ifdef _WIN32
    int mode = _S_IREAD|_S_IWRITE;
    int fd = _wopen(GetWideChar(szFilename), flags, mode);
#else
    mode_t mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
    int fd = open(szFilename, flags, mode);
#endif
    gzFile hFile;
    if (!(hFile = c4_gzdopen(fd,"rb"))) return 0;
    do
    {
        rd = c4_gzread(hFile,&buf,sizeof(buf));
        if (rd < 0) break;
        rval += rd;
    }
    while (rd == sizeof buf);
    c4_gzclose(hFile);
    return rval;
}

References _O_BINARY, c4_gzclose(), c4_gzdopen(), c4_gzread(), GetWideChar(), and O_CLOEXEC.

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