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Mem: Allow serializing of more than INT_MAX bytes

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Despite gzwrite taking an unsigned for length, it returns an int for
bytes written; gzwrite fails if (int)len < 0.  Because of this, call
gzwrite with len no larger than INT_MAX: write in blocks of INT_MAX if
data to be written is larger than INT_MAX.
This commit is contained in:
Marco Elver 2012-09-10 11:57:43 -04:00
parent 21d4d50ba1
commit 9e0edbcea8
1 changed files with 12 additions and 3 deletions
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15
src/mem/abstract_mem.cc
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@ -51,6 +51,7 @@
#include <cerrno>
#include <cstdio>
#include <climits>
#include <iostream>
#include <string>
@ -486,9 +487,17 @@ AbstractMemory::serialize(ostream &os)
fatal("Insufficient memory to allocate compression state for %s\n",
filename);
if (gzwrite(compressedMem, pmemAddr, size()) != (int)size()) {
fatal("Write failed on physical memory checkpoint file '%s'\n",
filename);
uint64_t pass_size = 0;
// gzwrite fails if (int)len < 0 (gzwrite returns int)
for (uint64_t written = 0; written < size(); written += pass_size) {
pass_size = (uint64_t)INT_MAX < (size() - written) ?
(uint64_t)INT_MAX : (size() - written);
if (gzwrite(compressedMem, pmemAddr + written,
(unsigned int) pass_size) != (int)pass_size) {
fatal("Write failed on physical memory checkpoint file '%s'\n",
filename);
}
}
if (gzclose(compressedMem))