109 lines
2.4 KiB
C++
109 lines
2.4 KiB
C++
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#include "Attachments.h"
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#include "read.h"
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#include "global_elements.h"
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static uint64_t ReadAttachedFile(nsmkv::MKVReader *reader, uint64_t size, nsmkv::AttachedFile &attached_file)
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{
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uint64_t total_bytes_read=0;
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while (size)
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{
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ebml_node node;
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uint64_t bytes_read = read_ebml_node(reader, &node);
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if (bytes_read == 0)
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return 0;
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// benski> checking bytes_read and node.size separately prevents possible integer overflow attack
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if (bytes_read > size)
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return 0;
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total_bytes_read+=bytes_read;
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size-=bytes_read;
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if (node.size > size)
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return 0;
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total_bytes_read+=node.size;
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size-=node.size;
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switch(node.id)
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{
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case mkv_attachments_filename:
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{
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char *utf8 = 0;
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if (read_utf8(reader, node.size, &utf8) == 0)
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return 0;
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if (utf8)
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printf("Filename: %s\n", utf8);
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attached_file.Own(attached_file.filename, utf8);
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}
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break;
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case mkv_attachments_filemimetype:
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{
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char *utf8 = 0;
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if (read_utf8(reader, node.size, &utf8) == 0)
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return 0;
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if (utf8)
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printf("File MIME Type: %s\n", utf8);
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attached_file.Own(attached_file.mime_type, utf8);
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}
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break;
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case mkv_attachments_filedata:
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{
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printf("File Data: binary size %I64u\n", node.size);
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reader->Skip(node.size);
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}
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break;
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case mkv_attachments_fileuid:
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{
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uint64_t val;
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if (read_unsigned(reader, node.size, &val) == 0)
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return 0;
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printf("File UID: %I64x\n", val);
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attached_file.file_uid = val;
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}
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break;
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default:
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nsmkv::ReadGlobal(reader, node.id, node.size);
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}
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}
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return total_bytes_read;
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}
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uint64_t nsmkv::ReadAttachment(nsmkv::MKVReader *reader, uint64_t size, nsmkv::Attachments &attachments)
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{
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uint64_t total_bytes_read=0;
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while (size)
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{
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ebml_node node;
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uint64_t bytes_read = read_ebml_node(reader, &node);
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if (bytes_read == 0)
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return 0;
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// benski> checking bytes_read and node.size separately prevents possible integer overflow attack
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if (bytes_read > size)
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return 0;
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total_bytes_read+=bytes_read;
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size-=bytes_read;
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if (node.size > size)
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return 0;
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total_bytes_read+=node.size;
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size-=node.size;
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switch(node.id)
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{
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case mkv_attachments_attachedfile:
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{
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printf("Attachmented File\\n");
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nsmkv::AttachedFile attached_file;
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ReadAttachedFile(reader, node.size, attached_file);
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}
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break;
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default:
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ReadGlobal(reader, node.id, node.size);
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}
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}
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return total_bytes_read;
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}
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