unarch_io.c

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#include "unarch_io.h"
 
#include <string.h>
 
size_t unarch_mem_read(void* ctx, uint64_t offset, void* buf, size_t len)
{
  const unarch_mem_t* m = (const unarch_mem_t*)ctx;
  if (m == nullptr) {
    return 0U;
  }
  if (m->base == nullptr) {
    return 0U;
  }
  if (buf == nullptr) {
    return 0U;
  }
  if (offset >= (uint64_t)m->len) {
    return 0U;
  }
  const uint64_t avail = (uint64_t)m->len - offset;
  const size_t   n     = ((uint64_t)len > avail) ? (size_t)avail : len;
  if (n == 0U) {
    return 0U;
  }
  (void)memcpy(buf, &m->base[offset], n);
  return n;
}