hexdump.cpp

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#include <ctype.h>
#include <stdio.h>
 
#include "efiprintf.h"
 
#include "hexdump.h"
 
#ifndef HEXDUMP_COLS
    #define HEXDUMP_COLS 16
#endif
 
void hexdump(void *mem, size_t len, unsigned int prefix, bool printChar) {
    char buffer[128];
    size_t offset = 0;
 
    for (unsigned i = 0; i < len + ((len % HEXDUMP_COLS) ? (HEXDUMP_COLS - len % HEXDUMP_COLS) : 0); i++) {
        /* print offset */
        if (i % HEXDUMP_COLS == 0) {
            offset += sprintf(buffer + offset, "%08x: ", prefix + i);
        } else if ((i + HEXDUMP_COLS / 2) % HEXDUMP_COLS == 0) {
            offset += sprintf(buffer + offset, " ");
        }
 
        /* print hex data */
        if (i < len) {
            offset += sprintf(buffer + offset, "%02x ", 0xFF & ((unsigned char *)mem)[i]);
        } else if (printChar) {
            /* end of block, just aligning for ASCII dump */
            offset += sprintf(buffer + offset, "   ");
        }
 
        if (i % HEXDUMP_COLS == (HEXDUMP_COLS - 1)) {
            if (printChar) {
                /* print ASCII dump */
                offset += sprintf(buffer + offset, "|");
                for (unsigned j = i - (HEXDUMP_COLS - 1); j <= i; j++)
                {
                    if (j >= len) {
                        /* end of block, not really printing */
                        offset += sprintf(buffer + offset, " ");
                    } else if (isprint(((unsigned char *)mem)[j])) {
                        /* printable char */
                        offset += sprintf(buffer + offset, "%c", 0xFF & ((char *)mem)[j]);
                    } else {
                        /* other char */
                        offset += sprintf(buffer + offset, ".");
                    }
                }
            }
 
            offset += sprintf(buffer + offset, "|");
            buffer[offset] = '\0';
            efiPrintf("%s", buffer);
            offset = 0;
        }
    }
}