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simplify the way to calculate insn_cache in cs_disasm(). suggested by @hlide

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Nguyen Anh Quynh 2014-10-03 00:39:56 +08:00
parent 5267baf1f1
commit 4d3ccf46fd
1 changed files with 8 additions and 7 deletions
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15
cs.c
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@ -414,10 +414,10 @@ size_t cs_disasm(csh ud, const uint8_t *buffer, size_t size, uint64_t offset, si
MCInst mci;
uint16_t insn_size;
size_t c = 0, i;
unsigned int f = 0;
cs_insn *insn_cache;
unsigned int f = 0; // index of the next instruction in the cache
cs_insn *insn_cache; // cache contains disassembled instructions
void *total = NULL;
size_t total_size = 0;
size_t total_size = 0; // total size of output buffer containing all insns
bool r;
void *tmp;
size_t skipdata_bytes;
@ -527,11 +527,11 @@ size_t cs_disasm(csh ud, const uint8_t *buffer, size_t size, uint64_t offset, si
// one more instruction disassembled
c++;
if (count > 0 && c == count)
// disasm requested number of instructions
// already got requested number of instructions
break;
if (f == cache_size) {
// full cache, so resize total to contain next disasm insns
// full cache, so expand the cache to contain incoming insns
cache_size = cache_size * 8 / 5; // * 1.6 ~ golden ratio
total_size += (sizeof(cs_insn) * cache_size);
tmp = cs_mem_realloc(total, total_size);
@ -549,9 +549,10 @@ size_t cs_disasm(csh ud, const uint8_t *buffer, size_t size, uint64_t offset, si
}
total = tmp;
insn_cache = (cs_insn *)((char *)total + total_size - (sizeof(cs_insn) * cache_size));
// continue to fill in the cache after the last instruction
insn_cache = (cs_insn *)((char *)total + sizeof(cs_insn) * c);
// reset f back to 0
// reset f back to 0, so we fill in the cache from begining
f = 0;
} else
insn_cache++;