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#include <stdio.h>
#include <string.h>
#define buffer_size 256
typedef struct {
int size;
int offset;
char name[56];
} Entry;
int main(int argc, char** argv) {
int i, j, file_count, blob_offset, read, head_size;
char buffer[buffer_size];
Entry entry;
FILE* outfile, * infile;
outfile = fopen("pack", "wb");
if (!outfile) {
fprintf(stderr, "Failed to open 'pack' for writing.");
return 1;
}
file_count = argc - 1;
head_size = 8;
blob_offset = head_size + file_count * sizeof entry;
fwrite(&file_count, 4, 1, outfile);
fwrite(&blob_offset, 4, 1, outfile);
entry.offset = blob_offset;
for (i = 0; i < file_count; i++) {
strcpy(entry.name, argv[i + 1]);
infile = fopen(entry.name, "rb");
if (!infile) {
fprintf(
stderr,
"Failed to open '%s' for reading.",
entry.name
);
return 1;
}
fseek(infile, 0, SEEK_END);
entry.size = ftell(infile);
rewind(infile);
printf("Adding %s\n", entry.name);
fseek(outfile, head_size + i * sizeof entry, SEEK_SET);
fwrite(&entry, 1, sizeof entry, outfile);
fseek(outfile, entry.offset, SEEK_SET);
for (j = 0; j < entry.size; j += buffer_size) {
read = fread(buffer, 1, buffer_size, infile);
fwrite(buffer, 1, read, outfile);
}
entry.offset += entry.size;
fclose(infile);
}
fclose(outfile);
}
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