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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup imbdds
*/
#include <Stream.h>
#include <cstdio> /* printf */
#include <cstring> /* memcpy */
static const char *msg_error_seek = "DDS: trying to seek beyond end of stream (corrupt file?)";
static const char *msg_error_read = "DDS: trying to read beyond end of stream (corrupt file?)";
inline bool is_read_within_bounds(const Stream &mem, unsigned int count)
{
if (mem.pos >= mem.size) {
/* No more data remained in the memory buffer. */
return false;
}
if (count > mem.size - mem.pos) {
/* Reading past the memory bounds. */
return false;
}
return true;
}
unsigned int Stream::seek(unsigned int p)
{
if (p > size) {
set_failed(msg_error_seek);
}
else {
pos = p;
}
return pos;
}
unsigned int mem_read(Stream &mem, unsigned long long &i)
{
if (!is_read_within_bounds(mem, 8)) {
mem.set_failed(msg_error_seek);
return 0;
}
memcpy(&i, mem.mem + mem.pos, 8); /* TODO: make sure little endian. */
mem.pos += 8;
return 8;
}
unsigned int mem_read(Stream &mem, unsigned int &i)
{
if (!is_read_within_bounds(mem, 4)) {
mem.set_failed(msg_error_read);
return 0;
}
memcpy(&i, mem.mem + mem.pos, 4); /* TODO: make sure little endian. */
mem.pos += 4;
return 4;
}
unsigned int mem_read(Stream &mem, unsigned short &i)
{
if (!is_read_within_bounds(mem, 2)) {
mem.set_failed(msg_error_read);
return 0;
}
memcpy(&i, mem.mem + mem.pos, 2); /* TODO: make sure little endian. */
mem.pos += 2;
return 2;
}
unsigned int mem_read(Stream &mem, unsigned char &i)
{
if (!is_read_within_bounds(mem, 1)) {
mem.set_failed(msg_error_read);
return 0;
}
i = (mem.mem + mem.pos)[0];
mem.pos += 1;
return 1;
}
unsigned int mem_read(Stream &mem, unsigned char *i, unsigned int count)
{
if (!is_read_within_bounds(mem, count)) {
mem.set_failed(msg_error_read);
return 0;
}
memcpy(i, mem.mem + mem.pos, count);
mem.pos += count;
return count;
}
void Stream::set_failed(const char *msg)
{
if (!failed) {
puts(msg);
failed = true;
}
}
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