beginsWith -- Check if Byte Array Begins with Byte Sequence

Determine if a byte array begins with a specific byte sequence.

Download Chilkat C++ Libraries for VC++ 8.0 / Win32

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#include <CkByteData.h>

void ChilkatSample(void)
    {
    CkByteData zipData;
    CkByteData gifData;

    bool success;

    //  Zip files begin with these 4 bytes:
    unsigned char zipBegin_bytes[] = { 0x50, 0x4B, 3, 4};
    CkByteData zipBegin;
    zipBegin.append(zipBegin_bytes, 4);

    //  GIF files begin with "GIF89", which is this byte sequence:
    unsigned char gifBegin_bytes[] = { 0x47, 0x49, 0x46, 0x38, 0x39};
    CkByteData gifBegin;
    gifBegin.append(gifBegin_bytes, 5);

    success = zipData.loadFile("dude.zip");
    if (success == true) {
        if (zipData.beginsWith(zipBegin)) {
            printf("Yes, this is a .zip archive!\n");
        }
        else {
            printf("No, this is not a .zip archive.\n");
        }

    }
    else {
        printf("Failed to load dude.zip\n");
    }

    success = gifData.loadFile("dude.gif");
    if (success == true) {
        if (gifData.beginsWith(gifBegin)) {
            printf("Yes, this is a GIF image!\n");
        }
        else {
            printf("No, this is not a GIF image.\n");
        }

    }
    else {
        printf("Failed to load dude.gif\n");
    }

    }