fumiama/simple-protobuf
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增加实际读取长度

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fumiama
2021-05-18 23:09:23 +08:00
parent 7de841dba1
commit a8d503137e
4 changed files with 6 additions and 2 deletions
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.DS_Store vendored Normal file
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5
protobuf.c
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@@ -33,11 +33,13 @@ static int write_num(FILE* fp, uint32_t n) {
} }
SIMPLE_PB* get_pb(FILE* fp) { SIMPLE_PB* get_pb(FILE* fp) {
uint32_t init_pos = ftell(fp);
uint32_t struct_len = read_num(fp); uint32_t struct_len = read_num(fp);
if(struct_len > 1) { if(struct_len > 1) {
SIMPLE_PB* spb = malloc(struct_len + sizeof(uint32_t)); SIMPLE_PB* spb = malloc(struct_len + sizeof(uint32_t));
if(spb) { if(spb) {
spb->len = struct_len; spb->struct_len = struct_len;
spb->real_len = 0;
char* p = spb->target; char* p = spb->target;
char* end = p + struct_len; char* end = p + struct_len;
memset(p, 0, struct_len); memset(p, 0, struct_len);
@@ -47,6 +49,7 @@ SIMPLE_PB* get_pb(FILE* fp) {
fread(p, data_len, 1, fp); fread(p, data_len, 1, fp);
p += offset; p += offset;
} }
spb->real_len = ftell(fp) - init_pos;
return spb; return spb;
} }
} }

2
simple_protobuf.h
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@@ -4,7 +4,7 @@
#include <stdint.h> #include <stdint.h>
struct SIMPLE_PB { struct SIMPLE_PB {
uint32_t len; uint32_t struct_len, real_len;
char target[]; char target[];
}; };
typedef struct SIMPLE_PB SIMPLE_PB; typedef struct SIMPLE_PB SIMPLE_PB;

1
test.c
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@@ -34,6 +34,7 @@ int main() {
SIMPLE_PB* spb = get_pb(fp); SIMPLE_PB* spb = get_pb(fp);
memcpy(&t, spb->target, sizeof(struct TEST)); memcpy(&t, spb->target, sizeof(struct TEST));
printf("a:%u\nb:%u\nc:%u\nd:%llu\ne:%s\n", t.a, t.b, t.c, t.d, t.e); printf("a:%u\nb:%u\nc:%u\nd:%llu\ne:%s\n", t.a, t.b, t.c, t.d, t.e);
printf("Struct size: %u, read: %u\n", spb->struct_len, spb->real_len);
} else perror("[SPB]"); } else perror("[SPB]");
} else perror("[SPB]"); } else perror("[SPB]");
} }