81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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#include "http_rel.h"
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const char *http_get_body(const char *buf)
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{
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if (!buf) return NULL;
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/* 找到 header 与 body 之间的空行 "\r\n\r\n" */
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const char *sep = strstr(buf, "\r\n\r\n");
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if (!sep) return NULL; /* 格式错误 */
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const char *body = sep + 4; /* 跳过 "\r\n\r\n" */
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/* 简单判断:如果后面还有数据,就认为是 body */
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if (*body == '\0') return NULL; /* 没有 body */
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return body;
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}
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/* 一次性读完一个 HTTP 请求,返回 malloc 得到的完整字符串(含头+体),调用者 free。
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返回 NULL 表示读取出错或内存不足。
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*/
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char *recv_http_request(int cfd)
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{
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char head[8192];
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int body_len = 0;
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/* 1. 读头部到 \r\n\r\n */
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size_t n = 0;
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while (n < sizeof(head)) {
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if (read(cfd, head + n, 1) != 1) goto err;
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if (n >= 3 && memcmp(head + n - 3, "\r\n\r", 3) == 0) {
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if (read(cfd, head + n, 1) != 1) goto err; /* 再吃一个 \n */
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++n;
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break;
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}
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++n;
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}
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head[n] = 0;
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/* 2. 解析 Content-Length */
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const char *p = head;
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while ((p = strchr(p, '\n')) != NULL) {
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if (sscanf(p, "\nContent-Length: %d", &body_len) == 1) break;
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++p;
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}
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/* 3. 读 body */
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char *body = NULL;
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if (body_len > 0) {
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body = malloc(body_len + 1);
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if (!body) goto err;
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size_t got = 0;
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while (got < (size_t)body_len) {
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ssize_t rd = read(cfd, body + got, body_len - got);
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if (rd <= 0) { free(body); goto err; }
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got += rd;
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}
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body[got] = 0;
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}
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/* 4. 拼成完整字符串 */
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char *full = malloc(n + (body_len ? body_len : 0) + 1);
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if (!full) { free(body); goto err; }
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memcpy(full, head, n);
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if (body_len) memcpy(full + n, body, body_len);
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full[n + body_len] = 0;
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free(body);
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return full;
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err:
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return NULL;
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}
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