crca.c File Reference

#include "crca.h"

Go to the source code of this file.

Macros
#define	CRC_PRESET(crc, size, reflect, poly, xout)    { UTCRC_C(crc), (size), (reflect), UTCRC_C(poly), UTCRC_C(xout) }

Functions
void	crc_init_custom (RzCrc *ctx, utcrc crc, ut32 size, int reflect, utcrc poly, utcrc xout)
void	crc_update (RzCrc *ctx, const ut8 *data, ut32 sz)
void	crc_final (RzCrc *ctx, utcrc *r)
void	crc_init_preset (RzCrc *ctx, RzCrcPresets preset)
utcrc	rz_hash_crc_preset (const ut8 *data, ut32 size, RzCrcPresets preset)

Variables
RzCrc	crc_presets []

Macro Definition Documentation

CRC_PRESET

#define CRC_PRESET	(		crc,
			size,
			reflect,
			poly,
			xout
	)		{ UTCRC_C(crc), (size), (reflect), UTCRC_C(poly), UTCRC_C(xout) }

Definition at line 56 of file crca.c.

Function Documentation

crc_final()

void crc_final	(	RzCrc *	ctx,
		utcrc *	r
	)

Definition at line 38 of file crca.c.

                                     {
    utcrc crc;
    int i;
 
    crc = ctx->crc;
    crc &= (((UTCRC_C(1) << (ctx->size - 1)) - 1) << 1) | 1;
    if (ctx->reflect) {
        for (i = 0; i < (ctx->size >> 1); i++) {
            if (((crc >> i) ^ (crc >> (ctx->size - 1 - i))) & 1) {
                crc ^= (UTCRC_C(1) << i) ^ (UTCRC_C(1) << (ctx->size - 1 - i));
            }
        }
    }
 
    *r = crc ^ ctx->xout;
}

References i, r, and UTCRC_C.

Referenced by plugin_crca_final(), and rz_hash_crc_preset().

crc_init_custom()

void crc_init_custom	(	RzCrc *	ctx,
		utcrc	crc,
		ut32	size,
		int	reflect,
		utcrc	poly,
		utcrc	xout
	)

Definition at line 8 of file crca.c.

                                                                                            {
    ctx->crc = crc;
    ctx->size = size;
    ctx->reflect = reflect;
    ctx->poly = poly;
    ctx->xout = xout;
}

crc_init_preset()

void crc_init_preset	(	RzCrc *	ctx,
		RzCrcPresets	preset
	)

Definition at line 114 of file crca.c.

                                                      {
    ctx->crc = crc_presets[preset].crc;
    ctx->size = crc_presets[preset].size;
    ctx->reflect = crc_presets[preset].reflect;
    ctx->poly = crc_presets[preset].poly;
    ctx->xout = crc_presets[preset].xout;
}

References RzCrc::crc, crc_presets, RzCrc::poly, preset, RzCrc::reflect, RzCrc::size, and RzCrc::xout.

Referenced by rz_hash_crc_preset().

crc_update()

void crc_update	(	RzCrc *	ctx,
		const ut8 *	data,
		ut32	sz
	)

Definition at line 16 of file crca.c.

                                                      {
    utcrc crc, d;
    int i, j;
 
    crc = ctx->crc;
    for (i = 0; i < sz; i++) {
        d = data[i];
        if (ctx->reflect) {
            for (j = 0; j < 4; j++) {
                if (((d >> j) ^ (d >> (7 - j))) & 1) {
                    d ^= (1 << j) ^ (1 << (7 - j));
                }
            }
        }
        crc ^= d << (ctx->size - 8);
        for (j = 0; j < 8; j++) {
            crc = ((crc >> (ctx->size - 1)) & 1 ? ctx->poly : 0) ^ (crc << 1);
        }
    }
    ctx->crc = crc;
}

References d, and i.

Referenced by plugin_crca_update(), and rz_hash_crc_preset().

rz_hash_crc_preset()

utcrc rz_hash_crc_preset	(	const ut8 *	data,
		ut32	size,
		RzCrcPresets	preset
	)

Definition at line 122 of file crca.c.

                                                                          {
    if (!data || !size || preset >= CRC_PRESET_SIZE) {
        return 0;
    }
    utcrc r;
    RzCrc crcctx;
    crc_init_preset(&crcctx, preset);
    crc_update(&crcctx, data, size);
    crc_final(&crcctx, &r);
    return r;
}

References crc_final(), crc_init_preset(), CRC_PRESET_SIZE, crc_update(), preset, and r.

Variable Documentation

crc_presets

RzCrc crc_presets[]

Definition at line 60 of file crca.c.

Referenced by crc_init_preset().