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Diffstat (limited to 'emulator/qtools/decoder.cpp')
-rw-r--r-- | emulator/qtools/decoder.cpp | 278 |
1 files changed, 0 insertions, 278 deletions
diff --git a/emulator/qtools/decoder.cpp b/emulator/qtools/decoder.cpp deleted file mode 100644 index ec53181..0000000 --- a/emulator/qtools/decoder.cpp +++ /dev/null @@ -1,278 +0,0 @@ -// Copyright 2006 The Android Open Source Project - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <assert.h> -#include "decoder.h" -#include "trace_common.h" - -// This array provides a fast conversion from the initial byte in -// a varint-encoded object to the length (in bytes) of that object. -int prefix_to_len[] = { - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, - 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, - 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, - 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, - 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 9, 9, 17, 17 -}; - -// This array provides a fast conversion from the initial byte in -// a varint-encoded object to the initial data bits for that object. -int prefix_to_data[] = { - 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, - 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, - 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, - 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, - 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, - 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, - 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, - 112, 113, 114, 115, 116, 117, 118, 119, - 120, 121, 122, 123, 124, 125, 126, 127, - 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, - 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, - 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, - 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, - 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, - 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, - 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, - 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 0, 0, 0, 0 -}; - -signed char prefix_to_signed_data[] = { - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, - 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, - 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, - 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, - 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, - 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, - 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, - 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, - 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, - 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, - 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, - 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, - 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, - 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, - 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, - 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, - 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, - 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, - 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, - 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, - 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, - 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, - 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, - 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, - 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, - 0x00, 0x01, 0x02, 0x03, 0xfc, 0xfd, 0xfe, 0xff, - 0x00, 0x01, 0xfe, 0xff, 0x00, 0xff, 0x00, 0xff, -}; - -Decoder::Decoder() -{ - filename_ = NULL; - fstream_ = NULL; - next_ = NULL; - end_ = NULL; -} - -Decoder::~Decoder() -{ - Close(); - delete[] filename_; -} - -void Decoder::Close() -{ - if (fstream_) { - fclose(fstream_); - fstream_ = NULL; - } -} - -void Decoder::Open(char *filename) -{ - if (filename_ != NULL) { - delete[] filename_; - } - filename_ = new char[strlen(filename) + 1]; - strcpy(filename_, filename); - fstream_ = fopen(filename_, "r"); - if (fstream_ == NULL) { - perror(filename_); - exit(1); - } - - int rval = fread(buf_, 1, kBufSize, fstream_); - if (rval != kBufSize) { - if (ferror(fstream_)) { - perror(filename_); - exit(1); - } - if (!feof(fstream_)) { - fprintf(stderr, "Unexpected short fread() before eof\n"); - exit(1); - } - } - next_ = buf_; - end_ = buf_ + rval; -} - -void Decoder::FillBuffer() -{ - assert(next_ <= end_); - - if (end_ - next_ < kDecodingSpace && end_ == &buf_[kBufSize]) { - // Copy the unused bytes left at the end to the beginning of the - // buffer. - int len = end_ - next_; - if (len > 0) - memcpy(buf_, next_, len); - - // Read enough bytes to fill up the buffer, if possible. - int nbytes = kBufSize - len; - int rval = fread(buf_ + len, 1, nbytes, fstream_); - if (rval < nbytes) { - if (ferror(fstream_)) { - perror(filename_); - exit(1); - } - if (!feof(fstream_)) { - fprintf(stderr, "Unexpected short fread() before eof\n"); - exit(1); - } - } - end_ = &buf_[len + rval]; - next_ = buf_; - } -} - -void Decoder::Read(char *dest, int len) -{ - while (len > 0) { - int nbytes = end_ - next_; - if (nbytes == 0) { - FillBuffer(); - nbytes = end_ - next_; - if (nbytes == 0) - break; - } - if (nbytes > len) - nbytes = len; - memcpy(dest, next_, nbytes); - dest += nbytes; - len -= nbytes; - next_ += nbytes; - } -} - -// Decode a varint-encoded object starting at the current position in -// the array "buf_" and return the decoded value as a 64-bit integer. -// A varint-encoded object has an initial prefix that specifies how many -// data bits follow. If the first bit is zero, for example, then there -// are 7 data bits that follow. The table below shows the prefix values -// and corresponding data bits. -// -// Prefix Bytes Data bits -// 0 1 7 -// 10 2 14 -// 110 3 21 -// 1110 4 28 -// 11110 5 35 -// 111110 6 42 -// 11111100 9 64 -// 11111101 reserved -// 11111110 reserved -// 11111111 reserved -int64_t Decoder::Decode(bool is_signed) -{ - int64_t val64; - - if (end_ - next_ < kDecodingSpace) - FillBuffer(); - -#if BYTE_ORDER == BIG_ENDIAN - uint8_t byte0 = *next_; - - // Get the number of bytes to decode based on the first byte. - int len = prefix_to_len[byte0]; - - if (next_ + len > end_) { - fprintf(stderr, "%s: decoding past end of file.\n", filename_); - exit(1); - } - - // Get the first data byte. - if (is_signed) - val64 = prefix_to_signed_data[byte0]; - else - val64 = prefix_to_data[byte0]; - - next_ += 1; - for (int ii = 1; ii < len; ++ii) { - val64 = (val64 << 8) | *next_++; - } -#else - // If we are on a little-endian machine, then use large, unaligned loads. - uint64_t data = *(reinterpret_cast<uint64_t*>(next_)); - uint8_t byte0 = data; - data = bswap64(data); - - // Get the number of bytes to decode based on the first byte. - int len = prefix_to_len[byte0]; - - if (next_ + len > end_) { - fprintf(stderr, "%s: decoding past end of file.\n", filename_); - exit(1); - } - - // Get the first data byte. - if (is_signed) - val64 = prefix_to_signed_data[byte0]; - else - val64 = prefix_to_data[byte0]; - - switch (len) { - case 1: - break; - case 2: - val64 = (val64 << 8) | ((data >> 48) & 0xffull); - break; - case 3: - val64 = (val64 << 16) | ((data >> 40) & 0xffffull); - break; - case 4: - val64 = (val64 << 24) | ((data >> 32) & 0xffffffull); - break; - case 5: - val64 = (val64 << 32) | ((data >> 24) & 0xffffffffull); - break; - case 6: - val64 = (val64 << 40) | ((data >> 16) & 0xffffffffffull); - break; - case 9: - data = *(reinterpret_cast<uint64_t*>(&next_[1])); - val64 = bswap64(data); - break; - } - next_ += len; -#endif - return val64; -} |