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Jef 2024-09-24 14:54:57 +02:00
parent 537bcbc862
commit fc06254474
16440 changed files with 4239995 additions and 2 deletions
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108
Src/nsmkv/Attachments.cpp Normal file
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#include "Attachments.h"
#include "read.h"
#include "global_elements.h"
static uint64_t ReadAttachedFile(nsmkv::MKVReader *reader, uint64_t size, nsmkv::AttachedFile &attached_file)
{
uint64_t total_bytes_read=0;
while (size)
{
ebml_node node;
uint64_t bytes_read = read_ebml_node(reader, &node);
if (bytes_read == 0)
return 0;
// benski> checking bytes_read and node.size separately prevents possible integer overflow attack
if (bytes_read > size)
return 0;
total_bytes_read+=bytes_read;
size-=bytes_read;
if (node.size > size)
return 0;
total_bytes_read+=node.size;
size-=node.size;
switch(node.id)
{
case mkv_attachments_filename:
{
char *utf8 = 0;
if (read_utf8(reader, node.size, &utf8) == 0)
return 0;
if (utf8)
printf("Filename: %s\n", utf8);
attached_file.Own(attached_file.filename, utf8);
}
break;
case mkv_attachments_filemimetype:
{
char *utf8 = 0;
if (read_utf8(reader, node.size, &utf8) == 0)
return 0;
if (utf8)
printf("File MIME Type: %s\n", utf8);
attached_file.Own(attached_file.mime_type, utf8);
}
break;
case mkv_attachments_filedata:
{
printf("File Data: binary size %I64u\n", node.size);
reader->Skip(node.size);
}
break;
case mkv_attachments_fileuid:
{
uint64_t val;
if (read_unsigned(reader, node.size, &val) == 0)
return 0;
printf("File UID: %I64x\n", val);
attached_file.file_uid = val;
}
break;
default:
nsmkv::ReadGlobal(reader, node.id, node.size);
}
}
return total_bytes_read;
}
uint64_t nsmkv::ReadAttachment(nsmkv::MKVReader *reader, uint64_t size, nsmkv::Attachments &attachments)
{
uint64_t total_bytes_read=0;
while (size)
{
ebml_node node;
uint64_t bytes_read = read_ebml_node(reader, &node);
if (bytes_read == 0)
return 0;
// benski> checking bytes_read and node.size separately prevents possible integer overflow attack
if (bytes_read > size)
return 0;
total_bytes_read+=bytes_read;
size-=bytes_read;
if (node.size > size)
return 0;
total_bytes_read+=node.size;
size-=node.size;
switch(node.id)
{
case mkv_attachments_attachedfile:
{
printf("Attachmented File\\n");
nsmkv::AttachedFile attached_file;
ReadAttachedFile(reader, node.size, attached_file);
}
break;
default:
ReadGlobal(reader, node.id, node.size);
}
}
return total_bytes_read;
}