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/* SPDX-License-Identifier: Unlicense
*/
#include "coff_image.h"
#include "data_buffer.h"
#define OPTPARSE_IMPLEMENTATION
#define OPTPARSE_API static
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wold-style-cast"
#pragma GCC diagnostic ignored "-Wshadow"
#endif
#include "optparse/optparse.h"
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif
#include <cassert>
#include <cerrno>
#include <cstdio>
#include <cstdlib>
#include <cstring>
static bool g_print_header = false;
static bool g_print_optional_header = false;
static bool g_print_section_headers = false;
static void PrintCoffHeader(FILE *output_stream, const COFF::FileHeader &header)
{
fprintf(output_stream, "COFF Header:\n");
fprintf(output_stream, " Magic: %02x %02x (0x%x as big endian)\n",
(header.magic >> 8) & 0xff, header.magic & 0xff, header.magic);
fprintf(output_stream, " Number of section headers: %u\n", header.nsections);
// TODO proper time with year, month, day, hour, minute and second
fprintf(output_stream, " Time and date: %u\n", header.timedate);
fprintf(output_stream, " Symbol table file offset: %u (0x%x)\n",
header.symtable_offset, header.symtable_offset);
fprintf(output_stream, " Number of symbols: %u (0x%x)\n",
header.nsymbols, header.nsymbols);
fprintf(output_stream, " Optional header size, bytes: %u (0x%x)\n",
header.optional_header_nbytes, header.optional_header_nbytes);
// TODO Print detailed flags information
fprintf(output_stream, " Flags: 0x%x\n", header.flags);
}
static void PrintOptionalHeader(FILE *output_stream, const COFF::OptionalHeader &header)
{
fprintf(output_stream, "Optional Header:\n");
fprintf(output_stream, " Magic: %02x %02x (0x%x as big endian)\n",
(header.magic >> 8) & 0xff, header.magic & 0xff, header.magic);
fprintf(output_stream, " Version: 0x%04x\n", header.version);
fprintf(output_stream, " Size of text, bytes: %u\n", header.tsize);
fprintf(output_stream, " Size of initialized data, bytes: %u\n", header.dsize);
fprintf(output_stream, " Size of uninitialized data, bytes: %u\n", header.bsize);
fprintf(output_stream, " Program entry point: %u (0x%x)\n",
header.entry, header.entry);
fprintf(output_stream, " Base address of text: %u (0x%x)\n",
header.text_start, header.text_start);
fprintf(output_stream, " Base address of daata: %u (0x%x)\n",
header.data_start, header.data_start);
}
static const char *SectionTypeStr(COFF::SectionType type)
{
switch (type) {
case COFF::SectionType::Regular:
return "Regular ARL";
case COFF::SectionType::Dummy:
return "Dubby R";
case COFF::SectionType::NoLoad:
return "NoLoad AR";
case COFF::SectionType::Grouped:
return "Grouped";
case COFF::SectionType::Padding:
return "Padding L";
case COFF::SectionType::Copy:
return "Cppy A L";
case COFF::SectionType::Text:
return "Text ARL";
case COFF::SectionType::Data:
return "Data ARL";
case COFF::SectionType::Bss:
return "BSS ARL";
case COFF::SectionType::Org:
return "Org ARL";
case COFF::SectionType::Info:
return "Info";
case COFF::SectionType::Overlay:
return "Ovsrlay R";
case COFF::SectionType::Lib:
return "Lib ARL";
}
return "Unknwon";
}
static void PrintSectionHeader(FILE *output_stream, size_t index, const COFF::SectionHeader &header)
{
fprintf(output_stream,
" [%2zu] %-8s ""%08x " "%08x " "%08x " "%08x " "%08x " "\n",
index,
header.name,
header.paddr,
header.vaddr,
header.size,
header.section_offset,
header.reloc_offset);
fprintf(output_stream,
" %08x " " %04x %04x %08x " "%s\n",
header.lineno_offset,
header.nreloc,
header.nlineno,
header.flags,
SectionTypeStr(static_cast<COFF::SectionType>(header.flags & 0x8ff)));
}
static int ReadCoff(FILE *input_stream, FILE *output_stream)
{
auto input = DataBuffer::FromStream(input_stream);
const size_t input_size = input.occupied_size;
if (input_size == 0) {
fprintf(stderr, "DataBuffer::FromStream(input, input_stream): "
"Error: No data has been read\n");
return EXIT_FAILURE;
}
const COFF::Image coff(static_cast<DataBuffer&&>(input));
if (!coff.IsValid()) {
fprintf(stderr, "Error: COFF image is not valid: %s\n", coff.Error());
return EXIT_FAILURE;
}
const auto &file_header = coff.FileHeader();
if (g_print_header) {
PrintCoffHeader(output_stream, file_header);
}
if (g_print_optional_header && coff.HasOptionalHeader()) {
PrintOptionalHeader(output_stream, coff.OptionalHeader());
}
if (g_print_section_headers && file_header.nsections) {
fprintf(output_stream, "Section headers:\n");
fprintf(output_stream,
" [Nr] Name PhysAddr VirtAddr Size DatOffst RelOffst\n"
" LnNoOfft NReloc NLineNo Flags Type Alloc/Reloc/Load\n");
for (size_t i = 0; i < file_header.nsections; i++) {
PrintSectionHeader(output_stream, i, coff.GetSectionHeader(i));
}
}
return EXIT_SUCCESS;
}
static void PrintUsage(FILE *s, const char *argv0)
{
// Please, keep all lines in 80 columns range when printed.
fprintf(s,
"Usage: %s [options] <input-file-name>\n"
"Options:\n"
" -H, --help Show this message.\n"
" -a --all Equivalent to: -h -o -S\n"
" -h --file-header Display the COFF file header\n"
" -o --optional-header Display the optional COFF file header\n"
" -S --section-headers Display the sections' header\n"
" --sections An alias for --section-headers\n"
" -e --headers Equivalent to: -h -o -S\n"
" <input_file_name> COFF file with the machine code to extract\n"
" ('-' means stdin).\n"
, argv0);
}
int main(int, char* argv[])
{
struct optparse_long longopts[] = {
{"help", 'H', OPTPARSE_NONE},
{"all", 'a', OPTPARSE_NONE},
{"file-header", 'h', OPTPARSE_NONE},
{"optional-header", 'o', OPTPARSE_NONE},
{"section-headers", 'S', OPTPARSE_NONE},
{"sections", 0x80, OPTPARSE_NONE},
{"headers", 'e', OPTPARSE_NONE},
{},
};
const char *input_file_name = nullptr;
struct optparse options;
optparse_init(&options, argv);
// Parse opts
int option;
while ((option = optparse_long(&options, longopts, NULL)) != -1) {
switch (option) {
case 'H':
PrintUsage(stdout, argv[0]);
return EXIT_SUCCESS;
break;
case 'h':
g_print_header = true;
break;
case 'o':
g_print_optional_header = true;
break;
case 0x80:
case 'S':
g_print_section_headers = true;
break;
case 'a':
case 'e':
g_print_header = true;
g_print_optional_header = true;
g_print_section_headers = true;
break;
case '?':
fprintf(stderr, "main: optparse_long: Error: \"%s\"\n", options.errmsg);
return EXIT_FAILURE;
}
}
// Parse input file name
char *arg;
while ((arg = optparse_arg(&options))) {
if (input_file_name == nullptr) {
input_file_name = arg;
} else {
fprintf(stderr, "error: too many free arguments provided\n");
return EXIT_FAILURE;
}
}
// Open the files
FILE *input_stream = nullptr;
FILE *output_stream = stdout;
if (input_file_name) {
if (0 == strcmp(input_file_name, "-")) {
input_stream = stdin;
} else {
input_stream = fopen(input_file_name, "r");
}
if (input_stream == nullptr) {
const int err = errno;
fprintf(stderr, "main: fopen(\"%s\", \"r\"): Error (%d): \"%s\"\n", input_file_name, err, strerror(err));
return EXIT_FAILURE;
}
} else {
fprintf(stderr, "main: Error: no input file name specified, see usage below.\n");
PrintUsage(stderr, argv[0]);
return EXIT_FAILURE;
}
if (!g_print_header && !g_print_optional_header && !g_print_section_headers) {
fprintf(stderr, "main: Error: no display options specified, see usage below.\n");
PrintUsage(stdout, argv[0]);
return EXIT_FAILURE;
}
// Run the program
const int ret = ReadCoff(input_stream, output_stream);
fclose(output_stream);
fclose(input_stream);
return ret;
}
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