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Avoid strncmp() for checking fourCC codes and use a handcrafted function for it instead. Also add some assertions for null pointer checks.

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Originally committed to SVN as r2231.
This commit is contained in:
Niels Martin Hansen 2008-07-04 03:06:55 +00:00
parent a4fc3e8b13
commit 2c7da25e91
1 changed files with 17 additions and 4 deletions
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21
aegisub/audio_provider_pcm.cpp
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@ -40,6 +40,7 @@
#include "utils.h"
#include "aegisub_endian.h"
#include <stdint.h>
#include <assert.h>
#ifndef _WINDOWS
#include <sys/mman.h>
@ -260,6 +261,17 @@ private:
// either way, as the fields can depend on the compression.
};
static bool CheckFourcc(char *str1, char *str2)
{
assert(str1);
assert(str2);
return
(str1[0] == str2[0]) &&
(str1[1] == str2[1]) &&
(str1[2] == str2[2]) &&
(str1[3] == str2[3]);
}
public:
RiffWavPCMAudioProvider(const wxString &_filename)
: PCMAudioProvider(_filename)
@ -269,11 +281,12 @@ public:
// Read header
// Assume we won't get files smaller than 256 bytes
void *filestart = EnsureRangeAccessible(0, sizeof(RIFFChunk));
assert(filestart);
RIFFChunk &header = *(RIFFChunk*)filestart;
// Check that it's good
if (strncmp(header.ch.type, "RIFF", 4)) throw _T("RIFF PCM WAV audio provider: File is not a RIFF file");
if (strncmp(header.format, "WAVE", 4)) throw _T("RIFF PCM WAV audio provider: File is not a RIFF WAV file");
if (!CheckFourcc(header.ch.type, "RIFF")) throw _T("RIFF PCM WAV audio provider: File is not a RIFF file");
if (!CheckFourcc(header.format, "WAVE")) throw _T("RIFF PCM WAV audio provider: File is not a RIFF WAV file");
// Count how much more data we can have in the entire file
// The first 4 bytes are already eaten by the header.format field
@ -295,7 +308,7 @@ public:
data_left -= sizeof(ch);
filepos += sizeof(ch);
if (strncmp(ch.type, "fmt ", 4) == 0) {
if (CheckFourcc(ch.type, "fmt ")) {
if (got_fmt_header) throw _T("RIFF PCM WAV audio provider: Invalid file, multiple 'fmt ' chunks");
got_fmt_header = true;
@ -309,7 +322,7 @@ public:
bytes_per_sample = (Endian::LittleToMachine(fmt.significant_bits_sample) + 7) / 8; // round up to nearest whole byte
}
else if (strncmp(ch.type, "data", 4) == 0) {
else if (CheckFourcc(ch.type, "data")) {
// This won't pick up 'data' chunks inside 'wavl' chunks
// since the 'wavl' chunks wrap those.