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Decompress pre-compressed stubs in Linker::init().

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This commit is contained in:
Markus F.X.J. Oberhumer
2006-11-21 05:01:00 +01:00
parent 3365ccbb9c
commit 8dad091c6b
2 changed files with 49 additions and 11 deletions
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src/linker.cpp
+42 -8
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@@ -130,18 +130,52 @@ ElfLinker::~ElfLinker()
free(relocations);
}
void ElfLinker::init(const void *pdata, int plen)
void ElfLinker::init(const void *pdata_v, int plen)
{
upx_byte *i = new upx_byte[plen + 1];
memcpy(i, pdata, plen);
input = i;
inputlen = plen;
input[plen] = 0;
const upx_byte *pdata = (const upx_byte *) pdata_v;
// decompress
if (plen >= 16 && memcmp(pdata, "UPX#", 4) == 0)
{
int method = -1;
unsigned u_len, c_len;
if (pdata[4] == M_DEFLATE)
{
method = M_DEFLATE;
u_len = get_le16(pdata + 5);
c_len = get_le16(pdata + 7);
pdata += 9;
assert(9 + c_len == (unsigned) plen);
}
else if (pdata[4] == 0 && pdata[5] == M_DEFLATE)
{
method = M_DEFLATE;
u_len = get_le32(pdata + 6);
c_len = get_le32(pdata + 10);
pdata += 14;
assert(14 + c_len == (unsigned) plen);
}
else
throwBadLoader();
assert((unsigned) plen < u_len);
inputlen = u_len;
input = new upx_byte[inputlen + 1];
unsigned new_len = u_len;
int r = upx_decompress(pdata, c_len, input, &new_len, method, NULL);
if (r != 0 || new_len != u_len)
throwBadLoader();
}
else
{
inputlen = plen;
input = new upx_byte[inputlen + 1];
memcpy(input, pdata, inputlen);
}
input[inputlen] = 0; // NUL terminate
output = new upx_byte[plen];
output = new upx_byte[inputlen];
outputlen = 0;
int pos = find(input, plen, "Sections:", 9);
int pos = find(input, inputlen, "Sections:", 9);
assert(pos != -1);
char *psections = (char *) input + pos;