mirror of
https://github.com/WinampDesktop/winamp.git
synced 2024-12-29 01:16:07 +00:00
139 lines
3 KiB
C++
139 lines
3 KiB
C++
#include "header.h"
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#include "read.h"
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#include "global_elements.h"
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#ifdef WA_VALIDATE
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extern uint64_t max_id_length;
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extern uint64_t max_size_length;
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#endif
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// returns bytes read. 0 means EOF
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uint64_t nsmkv::ReadHeader(nsmkv::MKVReader *reader, uint64_t size, nsmkv::Header &header)
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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_header_doctype:
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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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header.OwnDocType(utf8);
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#ifdef WA_VALIDATE
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header.doctype_found = true;
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printf(" DocType: %s\n", header.doctype);
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#endif
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}
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break;
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case mkv_header_doctype_version:
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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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header.doctype_version = val;
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#ifdef WA_VALIDATE
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header.doctype_version_found = true;
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printf(" DocType Version: %I64u\n", header.doctype_version);
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#endif
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}
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break;
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case mkv_header_doctype_read_version:
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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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header.doctype_read_version = val;
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#ifdef WA_VALIDATE
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header.doctype_read_version_found = true;
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printf(" DocType Read Version: %I64u\n", header.doctype_read_version);
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#endif
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}
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break;
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case mkv_header_ebml_version:
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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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header.ebml_version = val;
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#ifdef WA_VALIDATE
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header.ebml_version_found = true;
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printf(" EBML Version: %I64u\n", header.ebml_version);
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#endif
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}
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break;
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case mkv_header_ebml_read_version:
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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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header.ebml_read_version = val;
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#ifdef WA_VALIDATE
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header.ebml_read_version_found = true;
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printf(" EBML Read Version: %I64u\n", header.ebml_read_version);
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#endif
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}
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break;
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case mkv_header_ebml_max_id_length:
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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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header.ebml_max_id_length = val;
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#ifdef WA_VALIDATE
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max_id_length = val;
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header.ebml_max_id_length_found = true;
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printf(" EBML Max ID Length: %I64u\n", header.ebml_max_id_length);
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#endif
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}
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break;
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case mkv_header_ebml_max_size_length:
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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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header.ebml_max_size_length = val;
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#ifdef WA_VALIDATE
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max_size_length = val;
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header.ebml_max_size_length_found = true;
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printf(" EBML Max Size Length: %I64u\n", header.ebml_max_size_length);
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#endif
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}
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break;
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default:
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{
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if (ReadGlobal(reader, node.id, node.size) == 0)
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return 0;
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}
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}
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}
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return total_bytes_read;
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}
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