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/* |
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** Copyright (c) 2006 D. Richard Hipp |
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** |
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** This program is free software; you can redistribute it and/or |
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** modify it under the terms of the Simplified BSD License (also |
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** known as the "2-Clause License" or "FreeBSD License".) |
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** This program is distributed in the hope that it will be useful, |
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** but without any warranty; without even the implied warranty of |
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** merchantability or fitness for a particular purpose. |
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** |
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** Author contact information: |
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** [email protected] |
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** http://www.hwaci.com/drh/ |
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** |
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******************************************************************************* |
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** |
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** This module implements the interface to the delta generator. |
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*/ |
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#include "config.h" |
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#include "deltacmd.h" |
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/* |
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** Create a delta that describes the change from pOriginal to pTarget |
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** and put that delta in pDelta. The pDelta blob is assumed to be |
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** uninitialized. |
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*/ |
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int blob_delta_create(Blob *pOriginal, Blob *pTarget, Blob *pDelta){ |
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const char *zOrig, *zTarg; |
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int lenOrig, lenTarg; |
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int len; |
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char *zRes; |
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blob_zero(pDelta); |
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zOrig = blob_materialize(pOriginal); |
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lenOrig = blob_size(pOriginal); |
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zTarg = blob_materialize(pTarget); |
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lenTarg = blob_size(pTarget); |
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blob_resize(pDelta, lenTarg+16); |
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zRes = blob_materialize(pDelta); |
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len = delta_create(zOrig, lenOrig, zTarg, lenTarg, zRes); |
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blob_resize(pDelta, len); |
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return 0; |
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} |
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/* |
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** COMMAND: test-delta-create |
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** |
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** Usage: %fossil test-delta-create FILE1 FILE2 DELTA |
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** |
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** Create and output a delta that carries FILE1 into FILE2. |
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** Store the result in DELTA. |
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*/ |
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void delta_create_cmd(void){ |
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Blob orig, target, delta; |
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if( g.argc!=5 ){ |
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usage("ORIGIN TARGET DELTA"); |
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} |
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if( blob_read_from_file(&orig, g.argv[2], ExtFILE)<0 ){ |
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fossil_fatal("cannot read %s", g.argv[2]); |
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} |
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if( blob_read_from_file(&target, g.argv[3], ExtFILE)<0 ){ |
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fossil_fatal("cannot read %s", g.argv[3]); |
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} |
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blob_delta_create(&orig, &target, &delta); |
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if( blob_write_to_file(&delta, g.argv[4])<(int)blob_size(&delta) ){ |
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fossil_fatal("cannot write %s", g.argv[4]); |
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} |
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blob_reset(&orig); |
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blob_reset(&target); |
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blob_reset(&delta); |
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} |
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/* |
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** COMMAND: test-delta-analyze |
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** |
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** Usage: %fossil test-delta-analyze FILE1 FILE2 |
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** |
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** Create and a delta that carries FILE1 into FILE2. Print the |
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** number bytes copied and the number of bytes inserted. |
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*/ |
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void delta_analyze_cmd(void){ |
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Blob orig, target, delta; |
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int nCopy = 0; |
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int nInsert = 0; |
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int sz1, sz2, sz3; |
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if( g.argc!=4 ){ |
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usage("ORIGIN TARGET"); |
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} |
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if( blob_read_from_file(&orig, g.argv[2], ExtFILE)<0 ){ |
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fossil_fatal("cannot read %s", g.argv[2]); |
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} |
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if( blob_read_from_file(&target, g.argv[3], ExtFILE)<0 ){ |
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fossil_fatal("cannot read %s", g.argv[3]); |
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} |
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blob_delta_create(&orig, &target, &delta); |
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delta_analyze(blob_buffer(&delta), blob_size(&delta), &nCopy, &nInsert); |
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sz1 = blob_size(&orig); |
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sz2 = blob_size(&target); |
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sz3 = blob_size(&delta); |
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blob_reset(&orig); |
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blob_reset(&target); |
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blob_reset(&delta); |
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fossil_print("original size: %8d\n", sz1); |
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fossil_print("bytes copied: %8d (%.2f%% of target)\n", |
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nCopy, (100.0*nCopy)/sz2); |
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fossil_print("bytes inserted: %8d (%.2f%% of target)\n", |
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nInsert, (100.0*nInsert)/sz2); |
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fossil_print("final size: %8d\n", sz2); |
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fossil_print("delta size: %8d\n", sz3); |
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} |
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/* |
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** Apply the delta in pDelta to the original file pOriginal to generate |
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** the target file pTarget. The pTarget blob is initialized by this |
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** routine. |
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** |
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** It works ok for pTarget and pOriginal to be the same blob. |
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** |
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** Return the length of the target. Return -1 if there is an error. |
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*/ |
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int blob_delta_apply(Blob *pOriginal, Blob *pDelta, Blob *pTarget){ |
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int len, n; |
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Blob out; |
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n = delta_output_size(blob_buffer(pDelta), blob_size(pDelta)); |
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blob_zero(&out); |
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if( n<0 ) return -1; |
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blob_resize(&out, n); |
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len = delta_apply( |
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blob_buffer(pOriginal), blob_size(pOriginal), |
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blob_buffer(pDelta), blob_size(pDelta), |
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blob_buffer(&out)); |
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if( len<0 ){ |
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blob_reset(&out); |
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}else if( len!=n ){ |
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blob_resize(&out, len); |
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} |
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if( pTarget==pOriginal ){ |
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blob_reset(pOriginal); |
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} |
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*pTarget = out; |
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return len; |
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} |
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/* |
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** COMMAND: test-delta-apply |
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** |
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** Usage: %fossil test-delta-apply FILE1 DELTA FILE2 |
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** |
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** Apply DELTA to FILE1 and output the result in FILE2. |
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*/ |
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void delta_apply_cmd(void){ |
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Blob orig, target, delta; |
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if( g.argc!=5 ){ |
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usage("ORIGIN DELTA TARGET"); |
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} |
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if( blob_read_from_file(&orig, g.argv[2], ExtFILE)<0 ){ |
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fossil_fatal("cannot read %s", g.argv[2]); |
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} |
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if( blob_read_from_file(&delta, g.argv[3], ExtFILE)<0 ){ |
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fossil_fatal("cannot read %s", g.argv[3]); |
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} |
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blob_init(&target, 0, 0); |
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blob_delta_apply(&orig, &delta, &target); |
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if( blob_write_to_file(&target, g.argv[4])<(int)blob_size(&target) ){ |
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fossil_fatal("cannot write %s", g.argv[4]); |
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} |
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blob_reset(&orig); |
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blob_reset(&target); |
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blob_reset(&delta); |
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} |
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/* |
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** COMMAND: test-delta |
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** |
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** Usage: %fossil test-delta FILE1 FILE2 |
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** |
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** Read two files named on the command-line. Create and apply deltas |
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** going in both directions. Verify that the original files are |
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** correctly recovered. |
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*/ |
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void cmd_test_delta(void){ |
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Blob f1, f2; /* Original file content */ |
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Blob d12, d21; /* Deltas from f1->f2 and f2->f1 */ |
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Blob a1, a2; /* Recovered file content */ |
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if( g.argc!=4 ) usage("FILE1 FILE2"); |
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blob_read_from_file(&f1, g.argv[2], ExtFILE); |
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blob_read_from_file(&f2, g.argv[3], ExtFILE); |
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blob_delta_create(&f1, &f2, &d12); |
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blob_delta_create(&f2, &f1, &d21); |
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blob_delta_apply(&f1, &d12, &a2); |
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blob_delta_apply(&f2, &d21, &a1); |
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if( blob_compare(&f1,&a1) || blob_compare(&f2, &a2) ){ |
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fossil_fatal("delta test failed"); |
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} |
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fossil_print("ok\n"); |
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} |
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