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MS-DOS file header. More...
Data Fields | |
| uint16_t | signature |
| 0x4d, 0x5a. This is the "magic number" of an EXE file | |
| uint16_t | bytes_in_last_block |
| The number of bytes in the last block of the program that are actually used. More... | |
| uint16_t | blocks_in_file |
| Number of blocks in the file that are part of the EXE file. More... | |
| uint16_t | num_relocs |
| Number of relocation entries stored after the header. May be zero. | |
| uint16_t | header_paragraphs |
| Number of paragraphs in the header. More... | |
| uint16_t | min_extra_paragraphs |
| Number of paragraphs of additional memory that the program will need. More... | |
| uint16_t | max_extra_paragraphs |
| Maximum number of paragraphs of additional memory. More... | |
| uint16_t | ss |
| Relative value of the stack segment. More... | |
| uint16_t | sp |
| Initial value of the SP register. | |
| uint16_t | checksum |
| Word checksum. More... | |
| uint16_t | ip |
| Initial value of the IP register (entry point). | |
| uint16_t | cs |
| Initial value of the CS register, relative to the segment the program was loaded at. | |
| uint16_t | reloc_table_offset |
| Offset of the first relocation item in the file. | |
| uint16_t | overlay_number |
| Overlay number. Normally zero, meaning that it's the main program. | |
| uint16_t | reserved1 [4] |
| uint16_t | oem_id |
| uint16_t | oem_info |
| uint16_t | reserved2 [10] |
| int32_t | pe_sign_location |
| Location of PE format signature. | |
MS-DOS file header.
Definition at line 659 of file coffi_types.hpp.
| uint16_t blocks_in_file |
Number of blocks in the file that are part of the EXE file.
If [02-03] is non-zero, only that much of the last block is used
Definition at line 670 of file coffi_types.hpp.
| uint16_t bytes_in_last_block |
The number of bytes in the last block of the program that are actually used.
If this value is zero, that means the entire last block is used (i.e. the effective value is 512)
Definition at line 666 of file coffi_types.hpp.
| uint16_t checksum |
Word checksum.
If set properly, the 16-bit sum of all words in the file should be zero. Usually, this isn't filled in.
Definition at line 697 of file coffi_types.hpp.
| uint16_t header_paragraphs |
Number of paragraphs in the header.
The program's data begins just after the header, and this field can be used to calculate the appropriate file offset. The header includes the relocation entries. Note that some OSs and/or programs may fail if the header is not a multiple of 512 bytes.
Definition at line 678 of file coffi_types.hpp.
| uint16_t max_extra_paragraphs |
Maximum number of paragraphs of additional memory.
Normally, the OS reserves all the remaining conventional memory for your program, but you can limit it with this field.
Definition at line 687 of file coffi_types.hpp.
| uint16_t min_extra_paragraphs |
Number of paragraphs of additional memory that the program will need.
This is the equivalent of the BSS size in a Unix program. The program can't be loaded if there isn't at least this much memory available to it
Definition at line 683 of file coffi_types.hpp.
| uint16_t ss |
Relative value of the stack segment.
This value is added to the segment the program was loaded at, and the result is used to initialize the SS register.
Definition at line 691 of file coffi_types.hpp.
