427a2c920a
Also add missing task-ID reference & remove colon after \note as it doesn't render properly in doxygen.
104 lines
2.1 KiB
C++
104 lines
2.1 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/** \file
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* \ingroup imbdds
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*/
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#include <Stream.h>
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#include <cstdio> /* printf */
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#include <cstring> /* memcpy */
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static const char *msg_error_seek = "DDS: trying to seek beyond end of stream (corrupt file?)";
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static const char *msg_error_read = "DDS: trying to read beyond end of stream (corrupt file?)";
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inline bool is_read_within_bounds(const Stream &mem, unsigned int count)
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{
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if (mem.pos >= mem.size) {
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/* No more data remained in the memory buffer. */
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return false;
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}
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if (count > mem.size - mem.pos) {
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/* Reading past the memory bounds. */
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return false;
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}
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return true;
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}
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unsigned int Stream::seek(unsigned int p)
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{
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if (p > size) {
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set_failed(msg_error_seek);
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}
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else {
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pos = p;
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}
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return pos;
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}
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unsigned int mem_read(Stream &mem, unsigned long long &i)
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{
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if (!is_read_within_bounds(mem, 8)) {
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mem.set_failed(msg_error_seek);
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return 0;
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}
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memcpy(&i, mem.mem + mem.pos, 8); /* TODO: make sure little endian. */
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mem.pos += 8;
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return 8;
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}
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unsigned int mem_read(Stream &mem, unsigned int &i)
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{
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if (!is_read_within_bounds(mem, 4)) {
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mem.set_failed(msg_error_read);
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return 0;
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}
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memcpy(&i, mem.mem + mem.pos, 4); /* TODO: make sure little endian. */
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mem.pos += 4;
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return 4;
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}
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unsigned int mem_read(Stream &mem, unsigned short &i)
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{
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if (!is_read_within_bounds(mem, 2)) {
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mem.set_failed(msg_error_read);
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return 0;
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}
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memcpy(&i, mem.mem + mem.pos, 2); /* TODO: make sure little endian. */
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mem.pos += 2;
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return 2;
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}
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unsigned int mem_read(Stream &mem, unsigned char &i)
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{
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if (!is_read_within_bounds(mem, 1)) {
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mem.set_failed(msg_error_read);
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return 0;
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}
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i = (mem.mem + mem.pos)[0];
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mem.pos += 1;
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return 1;
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}
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unsigned int mem_read(Stream &mem, unsigned char *i, unsigned int count)
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{
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if (!is_read_within_bounds(mem, count)) {
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mem.set_failed(msg_error_read);
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return 0;
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}
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memcpy(i, mem.mem + mem.pos, count);
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mem.pos += count;
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return count;
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}
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void Stream::set_failed(const char *msg)
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{
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if (!failed) {
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puts(msg);
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failed = true;
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}
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}
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