Thu, 16 Jan 2020 10:23:19 GMT

1.5.asm

@@ -0,0 +1,64 @@
+.686p
+.model flat
+include kernel32.inc
+includelib kernel32.lib
+includelib msvcrt.lib
+extern _printf:proc
+extern _scanf:proc
+extern _strlen:proc
+extern _getchar:proc
+_bss segment
+strbuf db 100000 dup(0)
+cnt dd 256 dup(0)
+_bss ends
+.data
+strfmt db "%s",0
+strPrintfFmt db "Upper:%d Lower:%d",0
+.code
+
+_main proc
+    push ebp
+    mov ebp, esp
+    
+    xor ecx, ecx
+    inp$start:
+    push ecx
+    call _getchar
+    cmp eax, -1
+    je inp$end
+    inc cnt[eax*4]
+    pop ecx
+    mov byte ptr strbuf[ecx], al
+    inc ecx
+    jmp inp$start
+    inp$end:
+    xor eax, eax
+    xor ebx, ebx
+    xor edx, edx
+    mov al, 'a'
+    sum1$start:
+    cmp al, 'z'
+    jg sum1$end
+    add ebx, cnt[eax*4]
+    inc al
+    jmp sum1$start
+    sum1$end:
+    mov al, 'A'
+    sum2$start:
+    cmp al, 'Z'
+    jg sum2$end
+    add edx, cnt[eax*4]
+    inc al
+    jmp sum2$start
+    sum2$end:
+    push ebx
+    push edx
+    push offset strPrintfFmt
+    call _printf
+    add esp, 12
+    push 0
+    call ExitProcess
+    leave
+    ret
+_main endp
+end _main

3.2.asm

@@ -0,0 +1,126 @@
+.686p
+.model flat
+include kernel32.inc
+includelib kernel32.lib
+includelib msvcrt.lib
+extern _printf:proc
+extern _scanf:proc
+extern _strlen:proc
+extern _getchar:proc
+_bss segment
+strbuf db 100000 dup(0)
+cnt dd 256 dup(0)
+_bss ends
+.data
+strfmt db "%s",0
+strPrintfFmt db "%s",10,0
+rot dd 0
+.code
+process_char proc
+    mov eax, [esp+4]
+    cmp eax, 65
+    jl check_if_lower
+    cmp eax, 90
+    jg check_if_lower
+    jmp uppercase
+check_if_lower:
+    cmp eax, 97
+    jl end_of_proc
+    cmp eax, 122
+    jg end_of_proc
+    
+lowercase:
+    sub eax, 97
+    add eax, rot
+    cdq
+    mov ebx, 26
+    idiv ebx
+    add edx, 97
+    mov al, dl
+    jmp end_of_proc
+    
+uppercase:
+    sub eax, 65
+    add eax, rot
+    cdq
+    mov ebx, 26
+    idiv ebx
+    add edx, 65
+    mov al, dl
+    
+end_of_proc:
+    ret
+
+process_char endp
+_main proc
+len=-4
+    push ebp
+    mov ebp, esp
+    sub esp, 4
+
+    xor ecx, ecx
+    inp$start:
+    push ecx
+    call _getchar
+    pop ecx
+    cmp eax, -1
+    je inp$end
+    inc cnt[eax*4]
+    mov byte ptr strbuf[ecx], al
+    inc ecx
+    jmp inp$start
+    inp$end:
+    mov dword ptr len[ebp], ecx
+    
+    xor eax, eax
+    xor edx, edx
+    xor ecx, ecx
+    mov al, 'a'
+    loop1$start:
+    cmp al, 'z'
+    jg loop1$end
+    xor ebx, ebx
+    add ebx, cnt[eax*4]
+    add ebx, cnt[eax*4-128]
+    cmp ebx, edx
+    cmovge ecx, eax
+    cmovge edx, ebx
+    inc al
+    jmp loop1$start
+    loop1$end:
+    
+    sub ecx, 97
+    mov eax, 4
+    sub eax, ecx
+    cmp eax, 0
+    jge rot$set
+    add eax, 26
+    rot$set:
+    mov rot, eax
+    
+    mov ecx, dword ptr len[ebp]
+    test ecx, ecx
+    jz for@end
+for@start:
+    dec ecx
+    
+    movzx eax, byte ptr strbuf[ecx]
+    push eax
+    call process_char
+    add esp, 4
+    
+    mov byte ptr strbuf[ecx], al
+    
+    test ecx, ecx
+    jnz for@start
+for@end:
+    push offset strbuf
+    push offset strPrintfFmt
+    call _printf
+    add esp, 8
+    push 0
+    call ExitProcess
+    leave
+    ret
+_main endp
+end _main