87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
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#include "u_types.h"
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#include "cpiofs.h"
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#include "u_util.h"
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#include <string.h>
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int htoi(char *str, int len)
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{
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int n = 0;
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int i = 0;
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if (str == NULL || len <= 0)
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return -1;
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for (i = 0; i < len; i++)
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{
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if (str[i] != '0')
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{
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break;
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}
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}
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str += i;
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while (1)
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{
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if (*str >= '0' && *str <= '9')
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{
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n = 16 * n + (*str - '0');
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}
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else if (*str >= 'A' && *str <= 'F') // 十六进制还要判断字符是不是在A-F或者a-f之间
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{
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n = 16 * n + (*str - 'A' + 10);
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}
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else if (*str >= 'a' && *str <= 'f')
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{
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n = 16 * n + (*str - 'a' + 10);
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}
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else
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{
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break;
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}
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str++;
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i++;
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if (i >= len)
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{
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break;
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}
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}
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return n;
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}
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umword_t cpio_find_file(umword_t st, umword_t en, const char *name, umword_t *size)
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{
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uint8_t rByte;
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int32_t bk_inx;
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cpio_fs_t *file_info;
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for (umword_t i = st; st < en;)
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{
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file_info = (cpio_fs_t *)i;
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if (check_magic((char *)file_info) < 0)
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{
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return 0;
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}
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int name_size = htoi(file_info->c_namesize, 8);
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const char *f_name = (char *)(i + sizeof(cpio_fs_t));
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if (strcmp(f_name, name) == 0)
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{
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if (size)
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{
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*size = htoi(file_info->c_filesize, 8);
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}
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return (umword_t)(ALIGN(i + sizeof(cpio_fs_t) + name_size, 4));
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}
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if (strcmp("TRAILER!!", f_name) == 0)
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{
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return 0;
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}
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int file_size = htoi(file_info->c_filesize, 8);
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i = ALIGN(ALIGN(i + sizeof(cpio_fs_t) + name_size, 4) +
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file_size,
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4);
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}
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return 0;
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}
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