c++ version v2

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <inttypes.h>

char* get_file_contents(const char* filename, int& size)
{
    FILE *fp = fopen(filename, "rb");
    if (fp)
    {
        fseek(fp, 0, SEEK_END);
        size = ftell(fp);
        char* contents = new char[size];
        rewind(fp);
        fread(contents, 1, size, fp);
        fclose(fp);
        return contents;
    }
    throw errno;
}

#define READA(name, type, size) \
    type name[size]; \
    read(name, size); \
    for (int i = 0; i < level; i++) printf("    "); \
    printf(#name " = "); \
    dump(name, size); \
    puts("");
#define READ(name, type) \
    type name; \
    read(&name, 1); \
    for (int i = 0; i < level; i++) printf("    "); \
    printf(#name " = "); \
    dump(&name, 1); \
    puts("");
#define PUSH(name) \
    for (int i = 0; i < level; i++) printf("    "); \
    puts(name); \
    level++;
#define POP() \
    level--;
typedef int32_t s32;

struct reader
{
    char* data;
    int size = 0;
    int at = 0;
    int level = 0;

    void read(int32_t* out, int count) { readb(out, sizeof(*out) * count); }
    void read(char* out, int count) { readb(out, sizeof(*out) * count); }
    void readb(void* out, int bytes)
    {
        if (at + bytes >= size)
        {
            memset(out, 0, bytes);
            return;
        }
        memcpy(out, &data[at], bytes);
        at += bytes;
    }
    void dump(int32_t* v, int count)
    {
        for (int i = 0; i < count; i++)
            printf("%d ", v[i]);
    }
    void dump(char* v, int count)
    {
        fputc('"', stdout);
        for (int i = 0; i < count; i++)
            fputc(v[i], stdout);
        fputc('"', stdout);
    }
};

struct myreader : reader
{
    myreader()
    {
        data = get_file_contents("loop.wav", size);
        READA(magic, char, 4);
        READ(size, s32);

        int end = at + size;
        READA(riffmagic, char, 4);

        while (at < end)
        {
            readchunk();
        }
    }

    void readchunk()
    {
        PUSH("chunk");
        READA(magic, char, 4);
        READ(size, s32);
        at += size;
        POP();
    }
};

int main()
{
    myreader();
}