host/frontend/gcastv2/libandroid/hexdump.cpp

#include <media/stagefright/foundation/hexdump.h>

#include <media/stagefright/foundation/ADebug.h>

#include <ctype.h>
#include <stdint.h>
#include <stdio.h>

namespace android {

static void appendIndent(std::string *s, int32_t indent) {
    static const char kWhitespace[] =
        "                                        "
        "                                        ";

    CHECK_LT((size_t)indent, sizeof(kWhitespace));

    s->append(kWhitespace, indent);
}

void hexdump(const void *_data, size_t size, size_t indent, std::string *appendTo) {
    const uint8_t *data = (const uint8_t *)_data;

    size_t offset = 0;
    while (offset < size) {
        std::string line;

        appendIndent(&line, indent);

        char tmp[32];
        snprintf(tmp, sizeof(tmp), "%08lx:  ", (unsigned long)offset);

        line.append(tmp);

        for (size_t i = 0; i < 16; ++i) {
            if (i == 8) {
                line.append(1, ' ');
            }
            if (offset + i >= size) {
                line.append("   ");
            } else {
                snprintf(tmp, sizeof(tmp), "%02x ", data[offset + i]);
                line.append(tmp);
            }
        }

        line.append(1, ' ');

        for (size_t i = 0; i < 16; ++i) {
            if (offset + i >= size) {
                break;
            }

            if (isprint(data[offset + i])) {
                line.append(1, (char)data[offset + i]);
            } else {
                line.append(1, '.');
            }
        }

        if (appendTo != NULL) {
            appendTo->append(line);
            appendTo->append("\n");
        } else {
            ALOGI("%s", line.c_str());
        }

        offset += 16;
    }
}

}  // namespace android