user: 请将以下的汇编代码转换成C语言代码:

```asm
<sam3Base32Decode>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  mov    %edx,%r12d
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x18(%rsp)
  xor    %eax,%eax
  mov    %r12d,%eax
  test   %rsi,%rsi
  not    %eax
  setne  %dl
  shr    $0x1f,%eax
  test   %al,%dl
  je     L178
  mov    %rdi,%rbx
  test   %rdi,%rdi
  je     L178
  test   %r12d,%r12d
  je     L227
  mov    %rsi,%r14
  xor    %r13d,%r13d
  lea    0x10(%rsp),%r15
  lea    D1(%rip),%rbp
  nopw   0x0(%rax,%rax,1)
L210:
  mov    $0x5,%ecx
  mov    %r15,%rdi
  mov    $0x8,%edx
  cmp    %ecx,%r12d
  cmovle %r12d,%ecx
  xor    %esi,%esi
  mov    %ecx,0xc(%rsp)
  call   <memset@plt>
  movslq 0xc(%rsp),%rax
  mov    %r14,%rdi
  mov    %rax,%rcx
  add    %rax,%r14
  mov    %r12d,%eax
  sub    %ecx,%r12d
  cmp    $0x4,%eax
  je     L56
  jg     L23
  cmp    $0x2,%eax
  je     L219
  cmp    $0x3,%eax
  jne    L100
  movzbl 0x14(%rsp),%esi
L131:
  movzbl 0x2(%rdi),%ecx
  lea    (%rcx,%rcx,1),%edx
  shr    $0x4,%cl
  and    $0x1e,%edx
  mov    %ecx,%r8d
  or     %esi,%edx
  mov    %dl,0x14(%rsp)
L58:
  movzbl 0x1(%rdi),%edx
  mov    %edx,%ecx
  mov    %edx,%esi
  sar    %edx
  shl    $0x4,%ecx
  and    $0x1f,%edx
  shr    $0x6,%sil
  and    $0x10,%ecx
  mov    %dl,0x12(%rsp)
  or     %r8d,%ecx
  mov    %cl,0x13(%rsp)
  movzbl (%rdi),%edx
  lea    0x0(,%rdx,4),%ecx
  shr    $0x3,%dl
  and    $0x1c,%ecx
  mov    %dl,0x10(%rsp)
  or     %esi,%ecx
  mov    %cl,0x11(%rsp)
  cmp    $0x3,%eax
  je     L228
  jg     L151
  cmp    $0x1,%eax
  je     L134
  cmp    $0x2,%eax
  jne    L155
L94:
  movb   $0x20,0x14(%rsp)
L228:
  mov    $0x2020,%eax
  mov    %ax,0x15(%rsp)
L35:
  movb   $0x20,0x17(%rsp)
L155:
  xor    %eax,%eax
  jmp    L120
L142:
  movzbl (%r15,%rax,1),%edx
L120:
  movzbl %dl,%edx
  movzbl 0x0(%rbp,%rdx,1),%edx
  mov    %dl,(%rbx,%rax,1)
  add    $0x1,%rax
  cmp    $0x8,%rax
  jne    L142
  add    $0x8,%rbx
  add    $0x8,%r13d
  test   %r12d,%r12d
  jg     L210
L30:
  movb   $0x0,(%rbx)
L62:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L96
  add    $0x28,%rsp
  mov    %r13d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L151:
  cmp    $0x4,%eax
  je     L35
  jmp    L155
L100:
  movzbl (%rdi),%edx
  lea    0x0(,%rdx,4),%eax
  shr    $0x3,%dl
  and    $0x1c,%eax
  or     %al,0x11(%rsp)
  mov    %dl,0x10(%rsp)
L134:
  mov    $0x2020,%ecx
  mov    %cx,0x12(%rsp)
  jmp    L94
  cs nopw 0x0(%rax,%rax,1)
L219:
  movzbl 0x13(%rsp),%r8d
  jmp    L58
  nopl   0x0(%rax,%rax,1)
L23:
  movzbl 0x4(%rdi),%r8d
  mov    %r8d,%edx
  shr    $0x5,%r8b
  and    $0x1f,%edx
  mov    %dl,0x17(%rsp)
L2:
  movzbl 0x3(%rdi),%edx
  lea    0x0(,%rdx,8),%ecx
  mov    %edx,%esi
  sar    $0x2,%edx
  and    $0x18,%ecx
  and    $0x1f,%edx
  shr    $0x7,%sil
  or     %r8d,%ecx
  mov    %dl,0x15(%rsp)
  mov    %cl,0x16(%rsp)
  jmp    L131
  nopl   (%rax)
L56:
  movzbl 0x16(%rsp),%r8d
  jmp    L2
L227:
  xor    %r13d,%r13d
  jmp    L30
L178:
  mov    $0xffffffff,%r13d
  jmp    L62
L96:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: tag: D1
type_guessed: string

tool: D1: abcdefghijklmnopqrstuvwxyz234567=

assistant: ```c
int sam3Base32Decode(char *dest, const void *srcbuf, int srcsize) {
  if (dest != NULL && srcbuf != NULL && srcsize >= 0) {
    static const char *const b32chars = "abcdefghijklmnopqrstuvwxyz234567=";
    const unsigned char *src = (const unsigned char *)srcbuf;
    int destsize = 0;
    while (srcsize > 0) {
      int blksize = (srcsize < 5 ? srcsize : 5);
      unsigned char n[8];
      memset(n, 0, sizeof(n));
      switch (blksize) {
      case 5:
        n[7] = (src[4] & 0x1f);
        n[6] = ((src[4] & 0xe0) >> 5);
      case 4:
        n[6] |= ((src[3] & 0x03) << 3);
        n[5] = ((src[3] & 0x7c) >> 2);
        n[4] = ((src[3] & 0x80) >> 7);
      case 3:
        n[4] |= ((src[2] & 0x0f) << 1);
        n[3] = ((src[2] & 0xf0) >> 4);
      case 2:
        n[3] |= ((src[1] & 0x01) << 4);
        n[2] = ((src[1] & 0x3e) >> 1);
        n[1] = ((src[1] & 0xc0) >> 6);
      case 1:
        n[1] |= ((src[0] & 0x07) << 2);
        n[0] = ((src[0] & 0xf8) >> 3);
        break;
      }
      src += blksize;
      srcsize -= blksize;
      switch (blksize) {
      case 1:
        n[2] = n[3] = 32;
      case 2:
        n[4] = 32;
      case 3:
        n[5] = n[6] = 32;
      case 4:
        n[7] = 32;
      case 5:
        break;
      }
      for (int f = 0; f < 8; ++f)
        *dest++ = b32chars[n[f]];
      destsize += 8;
    }
    *dest++ = 0;
    return destsize;
  }
  return -1;
}
```