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     L154
  mov    %rdi,%r13
  test   %rdi,%rdi
  je     L154
  test   %r12d,%r12d
  je     L29
  lea    0x10(%rsp),%rax
  mov    %rsi,%r15
  xor    %r14d,%r14d
  mov    %rax,0x8(%rsp)
  lea    D0(%rip),%rbp
  jmp    L83
  nopl   0x0(%rax)
L226:
  cmp    $0x1,%r8d
  je     L49
  movzbl %r10b,%esi
  movzbl %r9b,%edi
  cmp    $0x2,%r8d
  jne    L6
L67:
  mov    $0x20,%r8d
L144:
  mov    $0x20,%r10d
  mov    $0x20,%r9d
L0:
  mov    $0x20,%eax
L116:
  movzbl 0x0(%rbp,%rax,1),%eax
  movzbl 0x0(%rbp,%rdi,1),%edi
  movzbl %cl,%ecx
  movzbl %dl,%edx
  movzbl 0x0(%rbp,%r10,1),%r10d
  movzbl 0x0(%rbp,%r9,1),%r9d
  add    $0x8,%r13
  add    $0x8,%r14d
  shl    $0x8,%rax
  movzbl 0x0(%rbp,%r8,1),%r8d
  movzbl 0x0(%rbp,%rsi,1),%esi
  or     %r10,%rax
  movzbl 0x0(%rbp,%rcx,1),%ecx
  movzbl 0x0(%rbp,%rdx,1),%edx
  shl    $0x8,%rax
  or     %r9,%rax
  shl    $0x8,%rax
  or     %r8,%rax
  shl    $0x8,%rax
  or     %rdi,%rax
  shl    $0x8,%rax
  or     %rsi,%rax
  shl    $0x8,%rax
  or     %rcx,%rax
  shl    $0x8,%rax
  or     %rdx,%rax
  mov    %rax,-0x8(%r13)
  test   %r12d,%r12d
  jle    L38
L83:
  mov    $0x5,%ecx
  mov    0x8(%rsp),%rdi
  mov    $0x8,%edx
  cmp    %ecx,%r12d
  mov    %ecx,%ebx
  cmovle %r12d,%ebx
  xor    %esi,%esi
  call   <memset@plt>
  mov    %r12d,%r8d
  mov    %r15,%rax
  movslq %ebx,%rdx
  sub    %ebx,%r12d
  add    %rdx,%r15
  cmp    $0x4,%r8d
  je     L96
  jg     L137
  cmp    $0x2,%r8d
  je     L33
  cmp    $0x3,%r8d
  jne    L23
  movzbl 0x14(%rsp),%esi
L35:
  movzbl 0x2(%rax),%ecx
  lea    (%rcx,%rcx,1),%edx
  shr    $0x4,%cl
  and    $0x1e,%edx
  or     %esi,%edx
  mov    %dl,0x14(%rsp)
L189:
  movzbl 0x1(%rax),%esi
  movzbl (%rax),%edx
  xor    %eax,%eax
  mov    %esi,%r9d
  mov    %esi,%edi
  sar    %esi
  shl    $0x4,%r9d
  shr    $0x6,%dil
  mov    %esi,%r10d
  and    $0x1f,%esi
  and    $0x10,%r9d
  shl    $0x10,%esi
  and    $0x1f,%r10d
  or     %ecx,%r9d
  lea    0x0(,%rdx,4),%ecx
  shr    $0x3,%dl
  and    $0x1c,%ecx
  mov    %dl,%al
  or     %edi,%ecx
  mov    %r9d,%edi
  mov    %cl,%ah
  shl    $0x18,%edi
  movzwl %ax,%eax
  or     %esi,%eax
  or     %edi,%eax
  mov    %eax,0x10(%rsp)
  cmp    $0x3,%r8d
  je     L169
  jle    L226
  cmp    $0x4,%r8d
  jne    L6
  movzbl %r10b,%esi
  movzbl %r9b,%edi
  movzbl 0x14(%rsp),%r8d
  movzbl 0x15(%rsp),%r9d
  movzbl 0x16(%rsp),%r10d
  jmp    L0
  nopl   0x0(%rax)
L169:
  movzbl 0x14(%rsp),%r8d
  movzbl %r10b,%esi
  movzbl %r9b,%edi
  jmp    L144
L23:
  movzbl (%rax),%edx
  lea    0x0(,%rdx,4),%ecx
  shr    $0x3,%dl
  and    $0x1c,%ecx
  or     0x11(%rsp),%cl
L49:
  mov    $0x20,%edi
  mov    $0x20,%esi
  jmp    L67
  cs nopw 0x0(%rax,%rax,1)
L33:
  movzbl 0x13(%rsp),%ecx
  jmp    L189
  nopw   0x0(%rax,%rax,1)
L137:
  movzbl 0x4(%rax),%edx
  xor    %ecx,%ecx
  mov    %edx,%edi
  and    $0x1f,%edx
  shr    $0x5,%dil
  mov    %dil,%cl
  mov    %dl,%ch
  mov    %cx,0x16(%rsp)
L45:
  movzbl 0x3(%rax),%edx
  lea    0x0(,%rdx,8),%ecx
  mov    %edx,%esi
  sar    $0x2,%edx
  and    $0x18,%ecx
  shr    $0x7,%sil
  and    $0x1f,%edx
  or     %edi,%ecx
  mov    %cl,0x16(%rsp)
  xor    %ecx,%ecx
  mov    %sil,%cl
  mov    %dl,%ch
  mov    %cx,0x14(%rsp)
  jmp    L35
  nopw   0x0(%rax,%rax,1)
L96:
  movzbl 0x16(%rsp),%edi
  jmp    L45
  nopw   0x0(%rax,%rax,1)
L6:
  movzbl %r10b,%esi
  movzbl %r9b,%edi
  movzbl 0x17(%rsp),%eax
  movzbl 0x14(%rsp),%r8d
  movzbl 0x15(%rsp),%r9d
  movzbl 0x16(%rsp),%r10d
  jmp    L116
L29:
  xor    %r14d,%r14d
  nopw   0x0(%rax,%rax,1)
L38:
  movb   $0x0,0x0(%r13)
L84:
  mov    0x18(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L81
  add    $0x28,%rsp
  mov    %r14d,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L154:
  mov    $0xffffffff,%r14d
  jmp    L84
L81:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: label: D0
data_type: string

tool: D0: 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;
}
```