Add FLAC to trunk/deps/third_party/....

flac/src/libFLAC/md5.c

+#if HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdlib.h>             /* for malloc() */
+#include <string.h>             /* for memcpy() */
+
+#include "private/md5.h"
+#include "share/alloc.h"
+
+#ifndef FLaC__INLINE
+#define FLaC__INLINE
+#endif
+
+/*
+ * This code implements the MD5 message-digest algorithm.
+ * The algorithm is due to Ron Rivest.  This code was
+ * written by Colin Plumb in 1993, no copyright is claimed.
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Equivalent code is available from RSA Data Security, Inc.
+ * This code has been tested against that, and is equivalent,
+ * except that you don't need to include two pages of legalese
+ * with every copy.
+ *
+ * To compute the message digest of a chunk of bytes, declare an
+ * MD5Context structure, pass it to MD5Init, call MD5Update as
+ * needed on buffers full of bytes, and then call MD5Final, which
+ * will fill a supplied 16-byte array with the digest.
+ *
+ * Changed so as no longer to depend on Colin Plumb's `usual.h' header
+ * definitions; now uses stuff from dpkg's config.h.
+ *  - Ian Jackson <ijackson@nyx.cs.du.edu>.
+ * Still in the public domain.
+ *
+ * Josh Coalson: made some changes to integrate with libFLAC.
+ * Still in the public domain.
+ */
+
+/* The four core functions - F1 is optimized somewhat */
+
+/* #define F1(x, y, z) (x & y | ~x & z) */
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+/* This is the central step in the MD5 algorithm. */
+#define MD5STEP(f,w,x,y,z,in,s) \
+         (w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)
+
+/*
+ * The core of the MD5 algorithm, this alters an existing MD5 hash to
+ * reflect the addition of 16 longwords of new data.  MD5Update blocks
+ * the data and converts bytes into longwords for this routine.
+ */
+static void FLAC__MD5Transform(FLAC__uint32 buf[4], FLAC__uint32 const in[16])
+{
+        register FLAC__uint32 a, b, c, d;
+
+        a = buf[0];
+        b = buf[1];
+        c = buf[2];
+        d = buf[3];
+
+        MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+        MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+        MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+        MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+        MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+        MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+        MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+        MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+        MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+        MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+        MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+        MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+        MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+        MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+        MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+        MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+        MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+        MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+        MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+        MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+        MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+        MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+        MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+        MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+        MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+        MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+        MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+        MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+        MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+        MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+        MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+        MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+        MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+        MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+        MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+        MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+        MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+        MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+        MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+        MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+        MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+        MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+        MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+        MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+        MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+        MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+        MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+        MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+        MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+        MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+        MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+        MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+        MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+        MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+        MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+        MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+        MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+        MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+        MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+        MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+        MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+        MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+        MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+        MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+        buf[0] += a;
+        buf[1] += b;
+        buf[2] += c;
+        buf[3] += d;
+}
+
+#if WORDS_BIGENDIAN
+//@@@@@@ OPT: use bswap/intrinsics
+static void byteSwap(FLAC__uint32 *buf, unsigned words)
+{
+        register FLAC__uint32 x;
+        do {
+                x = *buf; 
+                x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff);
+                *buf++ = (x >> 16) | (x << 16);
+        } while (--words);
+}
+static void byteSwapX16(FLAC__uint32 *buf)
+{
+        register FLAC__uint32 x;
+
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf++ = (x >> 16) | (x << 16);
+        x = *buf; x = ((x << 8) & 0xff00ff00) | ((x >> 8) & 0x00ff00ff); *buf   = (x >> 16) | (x << 16);
+}
+#else
+#define byteSwap(buf, words)
+#define byteSwapX16(buf)
+#endif
+
+/*
+ * Update context to reflect the concatenation of another buffer full
+ * of bytes.
+ */
+static void FLAC__MD5Update(FLAC__MD5Context *ctx, FLAC__byte const *buf, unsigned len)
+{
+        FLAC__uint32 t;
+
+        /* Update byte count */
+
+        t = ctx->bytes[0];
+        if ((ctx->bytes[0] = t + len) < t)
+                ctx->bytes[1]++;        /* Carry from low to high */
+
+        t = 64 - (t & 0x3f);    /* Space available in ctx->in (at least 1) */
+        if (t > len) {
+                memcpy((FLAC__byte *)ctx->in + 64 - t, buf, len);
+                return;
+        }
+        /* First chunk is an odd size */
+        memcpy((FLAC__byte *)ctx->in + 64 - t, buf, t);
+        byteSwapX16(ctx->in);
+        FLAC__MD5Transform(ctx->buf, ctx->in);
+        buf += t;
+        len -= t;
+
+        /* Process data in 64-byte chunks */
+        while (len >= 64) {
+                memcpy(ctx->in, buf, 64);
+                byteSwapX16(ctx->in);
+                FLAC__MD5Transform(ctx->buf, ctx->in);
+                buf += 64;
+                len -= 64;
+        }
+
+        /* Handle any remaining bytes of data. */
+        memcpy(ctx->in, buf, len);
+}
+
+/*
+ * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void FLAC__MD5Init(FLAC__MD5Context *ctx)
+{
+        ctx->buf[0] = 0x67452301;
+        ctx->buf[1] = 0xefcdab89;
+        ctx->buf[2] = 0x98badcfe;
+        ctx->buf[3] = 0x10325476;
+
+        ctx->bytes[0] = 0;
+        ctx->bytes[1] = 0;
+
+        ctx->internal_buf = 0;
+        ctx->capacity = 0;
+}
+
+/*
+ * Final wrapup - pad to 64-byte boundary with the bit pattern
+ * 1 0* (64-bit count of bits processed, MSB-first)
+ */
+void FLAC__MD5Final(FLAC__byte digest[16], FLAC__MD5Context *ctx)
+{
+        int count = ctx->bytes[0] & 0x3f;       /* Number of bytes in ctx->in */
+        FLAC__byte *p = (FLAC__byte *)ctx->in + count;
+
+        /* Set the first char of padding to 0x80.  There is always room. */
+        *p++ = 0x80;
+
+        /* Bytes of padding needed to make 56 bytes (-8..55) */
+        count = 56 - 1 - count;
+
+        if (count < 0) {        /* Padding forces an extra block */
+                memset(p, 0, count + 8);
+                byteSwapX16(ctx->in);
+                FLAC__MD5Transform(ctx->buf, ctx->in);
+                p = (FLAC__byte *)ctx->in;
+                count = 56;
+        }
+        memset(p, 0, count);
+        byteSwap(ctx->in, 14);
+
+        /* Append length in bits and transform */
+        ctx->in[14] = ctx->bytes[0] << 3;
+        ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
+        FLAC__MD5Transform(ctx->buf, ctx->in);
+
+        byteSwap(ctx->buf, 4);
+        memcpy(digest, ctx->buf, 16);
+        memset(ctx, 0, sizeof(ctx));    /* In case it's sensitive */
+        if(0 != ctx->internal_buf) {
+                free(ctx->internal_buf);
+                ctx->internal_buf = 0;
+                ctx->capacity = 0;
+        }
+}
+
+/*
+ * Convert the incoming audio signal to a byte stream
+ */
+static void format_input_(FLAC__byte *buf, const FLAC__int32 * const signal[], unsigned channels, unsigned samples, unsigned bytes_per_sample)
+{
+        unsigned channel, sample;
+        register FLAC__int32 a_word;
+        register FLAC__byte *buf_ = buf;
+
+#if WORDS_BIGENDIAN
+#else
+        if(channels == 2 && bytes_per_sample == 2) {
+                FLAC__int16 *buf1_ = ((FLAC__int16*)buf_) + 1;
+                memcpy(buf_, signal[0], sizeof(FLAC__int32) * samples);
+                for(sample = 0; sample < samples; sample++, buf1_+=2)
+                        *buf1_ = (FLAC__int16)signal[1][sample];
+        }
+        else if(channels == 1 && bytes_per_sample == 2) {
+                FLAC__int16 *buf1_ = (FLAC__int16*)buf_;
+                for(sample = 0; sample < samples; sample++)
+                        *buf1_++ = (FLAC__int16)signal[0][sample];
+        }
+        else
+#endif
+        if(bytes_per_sample == 2) {
+                if(channels == 2) {
+                        for(sample = 0; sample < samples; sample++) {
+                                a_word = signal[0][sample];
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word;
+                                a_word = signal[1][sample];
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word;
+                        }
+                }
+                else if(channels == 1) {
+                        for(sample = 0; sample < samples; sample++) {
+                                a_word = signal[0][sample];
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word;
+                        }
+                }
+                else {
+                        for(sample = 0; sample < samples; sample++) {
+                                for(channel = 0; channel < channels; channel++) {
+                                        a_word = signal[channel][sample];
+                                        *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                        *buf_++ = (FLAC__byte)a_word;
+                                }
+                        }
+                }
+        }
+        else if(bytes_per_sample == 3) {
+                if(channels == 2) {
+                        for(sample = 0; sample < samples; sample++) {
+                                a_word = signal[0][sample];
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word;
+                                a_word = signal[1][sample];
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word;
+                        }
+                }
+                else if(channels == 1) {
+                        for(sample = 0; sample < samples; sample++) {
+                                a_word = signal[0][sample];
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word;
+                        }
+                }
+                else {
+                        for(sample = 0; sample < samples; sample++) {
+                                for(channel = 0; channel < channels; channel++) {
+                                        a_word = signal[channel][sample];
+                                        *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                        *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                        *buf_++ = (FLAC__byte)a_word;
+                                }
+                        }
+                }
+        }
+        else if(bytes_per_sample == 1) {
+                if(channels == 2) {
+                        for(sample = 0; sample < samples; sample++) {
+                                a_word = signal[0][sample];
+                                *buf_++ = (FLAC__byte)a_word;
+                                a_word = signal[1][sample];
+                                *buf_++ = (FLAC__byte)a_word;
+                        }
+                }
+                else if(channels == 1) {
+                        for(sample = 0; sample < samples; sample++) {
+                                a_word = signal[0][sample];
+                                *buf_++ = (FLAC__byte)a_word;
+                        }
+                }
+                else {
+                        for(sample = 0; sample < samples; sample++) {
+                                for(channel = 0; channel < channels; channel++) {
+                                        a_word = signal[channel][sample];
+                                        *buf_++ = (FLAC__byte)a_word;
+                                }
+                        }
+                }
+        }
+        else { /* bytes_per_sample == 4, maybe optimize more later */
+                for(sample = 0; sample < samples; sample++) {
+                        for(channel = 0; channel < channels; channel++) {
+                                a_word = signal[channel][sample];
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word; a_word >>= 8;
+                                *buf_++ = (FLAC__byte)a_word;
+                        }
+                }
+        }
+}
+
+/*
+ * Convert the incoming audio signal to a byte stream and FLAC__MD5Update it.
+ */
+FLAC__bool FLAC__MD5Accumulate(FLAC__MD5Context *ctx, const FLAC__int32 * const signal[], unsigned channels, unsigned samples, unsigned bytes_per_sample)
+{
+        const size_t bytes_needed = (size_t)channels * (size_t)samples * (size_t)bytes_per_sample;
+
+        /* overflow check */
+        if((size_t)channels > SIZE_MAX / (size_t)bytes_per_sample)
+                return false;
+        if((size_t)channels * (size_t)bytes_per_sample > SIZE_MAX / (size_t)samples)
+                return false;
+
+        if(ctx->capacity < bytes_needed) {
+                FLAC__byte *tmp = (FLAC__byte*)realloc(ctx->internal_buf, bytes_needed);
+                if(0 == tmp) {
+                        free(ctx->internal_buf);
+                        if(0 == (ctx->internal_buf = (FLAC__byte*)safe_malloc_(bytes_needed)))
+                                return false;
+                }
+                ctx->internal_buf = tmp;
+                ctx->capacity = bytes_needed;
+        }
+
+        format_input_(ctx->internal_buf, signal, channels, samples, bytes_per_sample);
+
+        FLAC__MD5Update(ctx, ctx->internal_buf, bytes_needed);
+
+        return true;
+}